Category Archives: Pressure

Pressure Transducers and Transmitters Manfacturer, China

A pressure transducer also called a pressure transmitter,

is a transducer that converts pressure into an analog electrical signal.

Pressure transmitters are used to measure the pressure,

or level of industrial liquids and gases.

The output is transmitted to a control system.

Accurate and stable process measurements ensure the safe,

reliable, and profitable operation of your plant.

Sino-Instrument is pressure transmitters manufacturer in China.

We offer all types of pressure transmitters.

Like Direct Mounted, flange-mounted, single flange,

double flange, Remote Diaphragm Seals, High Static, Digital Remote.

Most of our pressure transmitters are used in oil, liquids,

DP transmitter, flow measurement, level measurement, density,

and other process variables.

Pressure transducers are generally available with three types of electrical output;

millivolt, amplified voltage, and 4-20mA.

4-20 mA Output Pressure Transducers

These types of transducers are also known as pressure transmitters,

work with HART communicators.

Since a 4-20mA signal is least affected by electrical noise,

and resistance in the signal wires,

these transducers are best used when the signal must be transmitted long distances.

It is not uncommon to use these transducers in applications where the lead wire must be 1000 feet or more.

Choose the right pressure transducer for your application:

SI-EP489 Explosion Proof Pressure Transmitter

Posted on June 3, 2019 by KimGuo11

Explosion Proof Pressure transmitter refers to a pressure sensor with explosion-proof or intrinsically safe housing. Suitable for hazardous and explosive areas.

Explosion Proof Pressure transmitter, or explosion-proof pressure transducer, with the explosion-proof enclosure. For applications in hazardous areas. Class I, Division 1. Flameproof ExdIIBT5Gb; Intrinsically safe ExiaIICT4/T5/T6Ga.
SIEP489 has flexible pressure calibration, push-button configuration, and programmable using HART® Communication. All our electronic pressure transducers can be offered with Explosion-proof. Select explosion-proof pressure transmitters with Ex d certification and 4-20mA output signals for installation.

Sino-Inst offers a variety of Explosion-proof pressure sensors for industrial pressure measurement. If you have any questions, please contact our sales engineers.

More Pressure Transmitters

Features of Explosion Proof Pressure Transmitter

FM approved as “explosion-proof” for class I, div. 1 hazardous areas
Available with EXD approval “flameproof enclosure” for II 2 G Ex d II C
Current or voltage output
Designed for harsh ambient conditions
Low-power version available as an option

Specifications of SIEP489 explosion-proof pressure transmitter:

Standard range
Pressure type	Gauge pressure, absolute pressure, sealing pressure
Pressure range (bar)	1 1.6 2.5 4 6 10 16 25 40 60 100 160 200 250 300 400 500 600 750 1000 1500
Pressure range (psi)	15 30 50 75 100 200 300 500 750 1K 1.5K 3K 5K 10K 12K 15K 25K

Technical Specifications
Accuracy	±0.3 %FS ±0.5 %FS
Long-term stability (1 year)	±0.25 %FS
Response frequency (-3DB)	3.2kHz
Temperature compensation	-20~+85℃
Storage temperature	-40~+125℃
Load Resistance	Voltage output: RL ＞ 100KΩ, current output: RL≤ (supply voltage-9V) / 20mA
Overload pressure	150% FS (Range ＜ 6Bar) 300% FS (Range≥6Bar)
Destruction pressure	200% FS (Range ＜ 6Bar) 500% FS (Range≥6Bar, limit 10000Bar)
Mechanical vibration	±20g
Shock (11mS)	100g
Protection level	IP65
material	17-4PH (Range≥6Bar) 304 or 316L (Range <6Bar)
Electrical connections	Direct lead
Pressure interface	M20X1.5 G1 / 4 NPT1 / 4 (others can be customized)
Explosion-proof grade	Exd II CT6 Gb

Signal output	4~20 mA	0.5 ~ 4.5VDC (proportional output)	0.5~4.5VDC	0~5VDC	0~10VDC	RS485	RS232
Signal line specifications	2 Wire	3 Wire	3 Wire	3 Wire	3 Wire	4 Wire	4 Wire
Supply voltage	9~30VDC	5VDC	9~30VDC	9~30VDC	15~30VDC	9~30VDC	9~30VDC

Explosion proof pressure transmitter drawing

Applications of explosion proof pressure transmitter

Oil & Gas equipment needs a pressure transducer, that is reliable and able to withstand extreme environmental and pressure conditions.

Borehole monitoring
Oil Field Equipment
Refineries and petrochemical industry
Drilling platforms and pipelines
Upstream Oil and Gas Production
Natural Gas Compression and Transfer Control
Alternative Energy
Industrial and OEM Applications

We can provide maintenance, calibration and other services of the same type of products. Such as WIKA, Rosemount pressure transmitter.

Contact us now to see how we can help you with a pressure gauge solution that fits your exact needs.

Know More About Explosion proof pressure transmitter

Explosion-proof pressure transmitters are available in a wide range of specifications,
easy to install and use, safe and explosion-proof.
They can be widely used in petrochemical, electric power, metallurgy, pharmaceutical, food processing, and other industries.

Products comply with the “IEC” standard, and explosion-proof pressure transmitters are internationally renowned.

The company’s high-precision, high-stability pressure sensor components,
through high-reliability amplifier circuit and precise temperature compensation,
convert the absolute or gauge pressure of the measured medium into 4~20mA, 0~5VDC, 0~10VDC, and 1~5VDC. Such as standard electrical signals.

High-quality sensors hermetically sealed soldering technology
and a complete assembly process ensures excellent quality and performance.
The product is available in a variety of interface styles.
And a variety of lead styles to best meet customer needs.
And is suitable for use with a variety of measurement and control equipment.

Explosion proof pressure transmitter working principle

The explosion-proof pressure transmitter consists of an integrated intelligent sensor and peripheral circuits.

The sensor part is composed of a pressure sensor, a signal modulation circuit, a dedicated digital processing chip, a temperature sensor, and data memory, and the peripheral electronic circuit part is composed of an LCD display, function keys, and an EMC circuit.

The pressure signal is converted into an electrical signal by the pressure sensor. And the electrical signal is modulated. And sent to a dedicated digital processing chip for data processing.
And then converted into a 4~20 mA output signal corresponding to the pressure signal.
And the HART digital signal is superimposed on the current signal for communication.

Extended reading: How to calibrate HART pressure transmitters

Potentially explosive environment.

Such as flammable gas, dust environment, oil refinery, petrochemical plant, gas station, gas station, etc., explosive gas environment.

Under atmospheric conditions, a mixture of combustible substances in the form of gas, steam or mist, and air. After being ignited in the mixture, the combustion will spread throughout the environment of the unburned mixture.

Such as CH4, C2H2, C2H4, NH3, CO, C2H5OH, and other explosion-proof electrical equipment.

Intrinsically safe VS explosion-proof

The explosion-proof of the current pressure transmitter: mainly two forms of isolation explosion-proof and intrinsically safe explosion-proof.

Intrinsically safe explosion-proof:

“i” (Intrinsically safe electrical equipment and related equipment) Intrinsically safe circuits, circuits that cannot ignite the specified explosive gas or steam under the specified test conditions, under the specified test conditions, the electric sparks and thermal effects generated under the specified fault state . Intrinsically safe electrical equipment: All circuits are intrinsically safe electrical equipment.

Example: Intrinsic Safety: Ex ia II BT4

Flameproof:

It refers to the electrical equipment that encloses the components that can ignite the explosive mixture in a shell, and the shell can withstand the explosive pressure of the internal explosive mixture and prevent the explosion of the surrounding explosive mixture.

For example: Flameproof: Ex d II CT6

Ex(ia)ⅡC T6:

Sign	Symbol	Meaning
Explosion-proof declaration	Ex	Meet certain explosion-proof standards, such as my country’s national standards
Explosion-proof method	ia	Adopt ia-level intrinsically safe explosion-proof method, can be installed in О area
Gas category	Il c	It is allowed to involve IIC explosive gas
Temperature group	T6	The surface temperature of the instrument does not exceed 85℃

Ex（ia）ⅡC:

Sign	Symbol	Meaning
Explosion-proof declaration	Ex	Compliance with European explosion-proof standards
Explosion-proof method	ia	Adopt ia-level intrinsically safe explosion-proof method, can be installed in О area
Gas category	ll c	It is allowed to involve explosive gas of IIc

Technical Support

Explosion-proof differential pressure transmitter

Explosion-proof differential pressure transmitter is used to measure the liquid level, flow rate and pressure of liquid, gas or steam under high working pressure environment. Then converted into 4 ~ 20mA DC signal output. Intelligent type can communicate with HART Communicator.

Steam pressure transmitter

High Temperature Pressure Transducer/Transmitter for measuring pressure in hot environments. Liquids or gases up to 850 ° C. Such as steam, food processing & engine monitoring.

Application of high temperature pressure transmitter in steam pipeline.

Water pressure transmitter

Liquid level sensors also called a water pressure sensor, or water pressure transducer. SI-10 liquid pressure sensor uses waterproof device to achieve IP68 waterproof rating. Like: water pipe pressure, oil pressure for pipe or tank.SI-10 liquid pressure sensor is a piezoresistive silicon pressure sensor.

Natural gas pressure transducer

Gas pressure sensor for industrial gas pressure monitoring. Pagoda gas nozzle Φ8. Such SI-503K Pagoda Joint Gas Pressure sensor uses stainless steel as a whole. High-precision strain gage and advanced technology. It has high sensitivity, stable performance and good impact resistance.

**Diffused silicon Gauge Pressure Transmitter**

**Capacitive Gauge Pressure Transmitter**

**Flange Mounted Differential Pressure Transmitter**

**Extended Diaphragm Seal DP Level Transmitter**

**Remote Seal Differential Pressure Transmitter**

**Differential pressure(DP) level transmitter**

Sino-Inst offers over 20 Explosion Proof Pressure Transmitters. A wide variety of Pressure sensors options are available to you. Such as free samples, paid samples.

Sino-Instrument is a globally recognized manufacturer of Pressure sensors, located in China. Sino-Instrument sells through a mature distribution network that reaches all 30 countries worldwide.

Pressure sensors products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.

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KimGuo11

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

drurylandetheatre.com

SMT3151 Remote Diaphragm Seal Pressure Transmitter

Posted on May 29, 2019 by KimGuo11

Remote seal pressure transmitter, with capillary and diaphragm seal, remote mount. Diaphragm seal systems protect pressure transmitters from hot, viscous, contaminated or corrosive media.

Remote Diaphragm seal pressure transmitter with capillary is used as a level transmitter. Diaphragm Seals also called chemical seals, are used in applications where pressure sensor requires isolation from the process media. These applications are corrosive, high temperature, clogged. Or must sanitary fluids to remain in the pipeline or container. The pressure of the liquid in the process does not affect the pressure sensor. Instead, it is applied to the remote seal. And through the capillary, hydraulic pressure is transmitted to the pressure sensor. Installing and filling the diaphragm seal, the impact on instrument performance will be minimized.

Sino-Inst also offers repair, refurbishment or replacement of used transmitters with remote seals.

More Pressure Transmitters

Features of Remote Diaphragm Seal Pressure Transmitter

Protect pressure sensor

The remote transmission diaphragm can protect the transmitter diaphragm from corrosive, aggressive or extreme temperature.

Various sealing diaphragms are available

Sino-Inst can provide a suitable sealing diaphragm according to your measurement requirements. For example, remote threaded seal, flush flanged type seals, remote flange seal-RTJ gasket surface, extended flanged seal, etc.

Suitable for special environments.

Such as:
High / low temperature fluids;
Highly corrosive / high viscosity fluids;
Toxic fluids;
The fluids containing suspended solids which are deposited in the impulse piping and may cause clogging.

Specifications of Remote Diaphragm Seal Pressure Transmitter

Measurement parameters:	pressure, liquid level
Measuring range:	lower limit: -100% URL (continuously adjustable); upper limit: to + 100% URL (continuously adjustable)
Output:	two-wire system, 4-20mADC + HART output, digital communication; output signal limit: Imin = 3.9mA, Imax = 20.5mA
Alarm current:	①Low report mode (minimum): 3.7mA ②High report mode (maximum): 21mA ③No report mode (hold): keep the effective current value before the fault ④Alarm current standard setting: high report mode
Response time:	the damping constant of the amplifier part is 0.1s; the time constant of the sensor and the remote flange is 0.2-6s, which depends on the range of the sensor, the range ratio, the length of the capillary, and the viscosity of the filling fluid The additional adjustable time constant is: 0.1-60s.
Ambient temperature:	minimum: depends on the filling liquid; maximum: 85 ℃; with liquid crystal display, fluorine rubber sealing ring is -20 ~ +65 ℃
Storage temperature / transport temperature:	minimum: depends on filling liquid; maximum: 85 ℃
Relative humidity:	0-100%
Anti-shock:	acceleration: 50kg; duration 11ms
Anti-vibration:	2g to 500Hz
Process medium temperature limit:	medium temperature: -20 ～ 400 ℃
Pressure limit of transmitter body:	vacuum to maximum pressure
Rated pressure of remote flange:	ANSI standard: 150psi-600psi; DIN standard: PN1.6MPa-PN10MPa
Warm-up time:	<15s
Explosion-proof performance:	NEPSI explosion-proof license: ExdⅡCT6; NEPSI intrinsically safe license: ExiaⅡCT4; allowable temperature is -40 ～ + 65 ℃
Power and load conditions:	① The power supply voltage is DC24V, R≤ (Us-12) / Imax kΩ, where Imax = 23mA ②Max power supply voltage: 42VDC ③Minimum power supply voltage: 12VDC, 15VDC (backlit LCD display) ④Digital communication load range: 250-600Ω
Electrical connection:	M20 × 1.5 cable sealing buckle, the terminal is suitable for 0.5-2.5mm2 wire
Process connection:	The remote flange meets ANSI standard or DIN standard. Can be installed directly, please refer to the dimension drawing for flange size
Material:	Measuring capsule: stainless steel 316L; diaphragm: stainless steel 316L, Hastelloy C, tantalum
Process connection:	stainless steel 316
Filling fluid:	silicone oil, high temperature silicone oil, ultra high temperature silicone oil, vegetable oil
Pressure transmitter shell:	aluminum alloy material, epoxy resin on the surface
Shell sealing ring:	NBR
Nameplate:	Stainless steel 304
Weight:	DN50 / 2 inches about 7-10kg; DN80 / 3 inches about 8-11kg; DN100 / 4 inches about 9-12kg
Shell protection grade:	IP67

Types of SMT3151 Remote Diaphragm Seal System Pressure Transmitters

3151T flange type remote pressure transmitter

The selection is as follows:
3151TGP4SF00S1M4B4 0~40kPa
1199FFW A50AADL03H00

On behalf of the 3151TGP base table plus an American standard 2”150LB flange type remote transmission device, the capillary length is 3 meters.

3151T flat remote pressure transmitter

The selection is as follows:
3151TGP4SF00S1M4B4 0~40kPa
1199PFWA50AADL03H00

On behalf of the 3151TGP base table plus an American standard 2”150LB flat remote transmission device, the capillary length is 3 meters.

3151T type insert barrel remote pressure transmitter

The selection is as follows:
3151TGP4SF00S1M4B4 0~40kPa
1199EFWA50AABDL03H00

On behalf of the 3151TGP base table plus an American standard 2”150LB plug-in remote transmission device, the capillary length is 3 meters, the insertion barrel length is 100mm.

3151T threaded remote pressure transmitter

The selection is as follows:
3151TGP7SF00S1M4B4 0~1000kPa
1199RTWA1AADL03H00

On behalf of the 3151TGP base table plus a threaded connection remote transmission device, capillary length of 3 meters, user connection thread specifications 1/2NPT-14.

3151T type three clamp type remote pressure transmitter

The selection is as follows:
3151TGP5SF00S1M4B4 0~100kPa
1199SCWA1A0DL03H00

On behalf of the 3151TGP base table plus a three-clamp type remote transmission device, the capillary length is 3 meters, the user connection clamp specification is 1 1/2 inch.

3151GP/DP flange type remote pressure transmitter

The selection is as follows:
3151GP4SF22S1M4B3 0~40kPa
1199FFW A50AADL03H00

On behalf of the 3151GP base table plus an American standard 2”150LB flange type remote transmission device, the capillary length is 3 meters.

3151GP/DP flat remote pressure transmitter

The selection is as follows:
3151GP4SF22S1M4B3 0~40kPa
1199PFWA50AADL03H00

On behalf of the 3151GP base table plus an American standard 2”150LB flat remote transmission device, the capillary length is 3 meters.

3151GP/DP type insert barrel remote pressure transmitter

The selection is as follows:
3151GP4SF22S1M4B3 0~40kPabr>
1199EFWA50AABDL03H00

On behalf of the 3151GP base table plus an American standard 2”150LB plug-in remote transmission device, the capillary length is 3 meters, the insertion barrel length is 100mm.

3151GP/DP type threaded remote pressure transmitter

The selection is as follows:
3151GP7SF22S1M4B3 0~1000kPa
1199RTWA1AADL03H00

On behalf of the 3151GP base table plus a threaded connection remote transmission device, capillary length of 3 meters, user connection thread specifications 1/2NPT-14 specific size,

3151GP/DP type three clamp type remote pressure transmitter

The selection is as follows:
3151TGP5SF22S1M4B3 0~100kPa
1199SCWA1A0DL03H00

On behalf of the 3151GP base table plus a three-clamp type remote transmission device, the capillary length is 3 meters, the user connection clamp specification is 1 1/2 inch.

Diaphragm Seal System

Remote Diaphragm seal pressure transmitter, is the capillary type pressure transmitter. This type pressure transmitter, assembling diaphragm seals to field transmitters for the purpose of measuring pressure, differential pressure, level, and flow.

Diaphragm seals are used to prevent process medium from entering into the pressure-sensing assembly of the Differential pressure, Gauge pressure, or Absolute pressure transmitter.

Applications which is suitable for diaphragm seal system

For measuring the liquid level, density, flow and pressure of ;
high/low-temperature fluids;
highly corrosive/high viscosity fluids ;
the fluids which may cause clogging of impulse piping in the low temperature ;
toxic fluids;
the fluids containing suspended solids, which are deposited in the impulse piping and may cause clogging.

How do diaphragm seals work?

Basically, diaphragm seals are used in all pressure measurement processes to avoid direct contact between the measuring instrument and the medium during this process. In addition, if the measuring point cannot be installed or read because the measuring point is located in a hard-to-reach location, a diaphragm seal can also be used. In both cases, the applied pressure is transferred to the measuring instrument through the system fill fluid in the diaphragm seal housing.
The diaphragm of the seal can be made of different materials, such as stainless steel, Hastelloy, Monel or tantalum. In addition, coatings with ECTFE, PFA or gold can also be used.

We can provide the best diaphragm seal design, materials, system fill fluid and accessories for each application. The combined configuration of the pressure measuring instrument and the diaphragm seal is mainly determined by the special application conditions of the diaphragm sealing system.

How does a diaphragm pressure sensor work?

When the diaphragm seal pressure transmitter is working, the high and low pressure side isolation diaphragms and the filling liquid transfer the process pressure to the center filling liquid. The filling fluid in the center transmits the pressure to the sensing diaphragm in the center of the δ-chamber sensor. The sensing diaphragm is a tensioned elastic element, and its displacement changes with the differential pressure. For GP gauge pressure transmitters, the atmospheric pressure is applied to the low-pressure side of the sensing diaphragm. AP absolute pressure transmitter, the low pressure side always maintains a reference pressure. The maximum displacement of the sensing diaphragm is 0.004 inches (0.10 mm). The displacement is proportional to the pressure. The two capacitance fixed plates of the measuring diaphragm are linearly converted into a 2-wire current, voltage or digital HART output signal of 4-20mADC by the amplifying circuit.

What is a diaphragm seal?

Diaphragm seals, also known as chemical seals or remote seals, are used for pressure measurements when the process medium should not come into contact with the pressurised parts of the measuring instrument.

A diaphragm seal has two primary tasks:

Separation of the measuring instrument from the process medium
Transfer of the pressure to the measuring instrument

Extended reading: SI-703 Flush Diaphragm Pressure Sensor

What is remote seal?

The remote seal is used to prevent the medium in the pipeline from directly entering the pressure sensor assembly in the pressure transmitter. It is connected to the transmitter by a capillary filled with fluid. As a result, they’re often used in refining, petrochemical, and chemical plants.

Applicaitons of diaphragm seal

Typical applications where a diaphragm seal provides a cost-effective solution, to protecting the pressure instrument are:

In applications where the process fluid is corrosive;

In applications where the process fluid has a high viscosity,
is comprised of slurries, sludge or other material that can actually coat,
or damage a traditional pressure measuring device;

In applications where the process fluid can freeze or polymerize,
thus causing a condition that might lead to the instrument becoming immobilized,
or incapable of transmitting an accurate pressure measurement or signal.

The process side of the seal is isolated by a flexible diaphragm. The internal space between this diaphragm and pressure measuring sensor is filled with a system fill fluid. The pressure is transmitted from the measured medium, by the elastic diaphragm into the fluid. And from there to the measuring element, i.e. to the pressure measuring instrument or the transmitter.

Often, between the diaphragm seal and pressure measuring instrument, a capillary is connected. Capillary can eliminate or to minimize temperature effects from the hot fluid to the measuring instrument.

A Remote seal is mounted to the process by threaded, flanged, in-line, sanitary, or other connections. Usually, the fittings consist of T-pieces which are integrated into a pipeline, or of welding sockets which are welded to a pipeline, the process reactor or a tank.

This diaphragm seal type offers the advantage, that the “contact surface” between pressure medium and the diaphragm is relatively large. Thus ensuring accurate pressure measurement, especially for very low pressures (< 600 mbar).

Although standard remote seal bodies and diaphragms, are made of stainless steel, a variety of materials, from carbon steel to Hastelloy® C-276, are available to meet the demand of most applications.

A remote seal from Sino-Instrument can operate in pressure applications from 10″ Hg to 20,000 psi, and media temperatures between -130°F and 752°F. We can try to Learn more about the functionality, areas of application and advantages of a diaphragm seal in the following WIKA video.

Extended reading: Flat Pressure Sensor for High Viscosity Fluids

Diaphragm type pressure transmitter

https://www.drurylandetheatre.com/diaphragm-sealed-differential-pressure-transmitters-for-sale/

SI-D100 Diaphragm Pressure Gauge

SMT3151LT Differential pressure(DP) level transmitter

Data sheet of SMT3151 Diaphragm Seal Pressure transmitters

SMT3151 Diaphragm Seal Pressure transmitter data sheet Download

Diaphragm seal pressure transmitter installation

The remote pressure transmitter without capillary can be directly installed through the remote flange. The position deviation will produce a correctable zero offset
The electronic watch case can rotate 360 degrees at the maximum. The positioning screw can fix it at any position.
Single-crystal silicon remote flange is connected with the matching flange conforming to ANSI / DIN standard. The matching flange should be equipped with soft gasket and fixed bolts and nuts. The user can choose to install bolts and nuts.
For the remote transmission pressure transmitter with capillary, if the remote transmission sealing device is lower than the transmitter body, the maximum height drop between the remote transmission sealing device and the transmitter body should be less than 5m. When the working pressure is lower than 100kPa absolute pressure, the transmitter body must be lower than the remote transmission sealing device.
The minimum bending radius of the capillary is 75mm, winding is strictly prohibited

Q&A

Parameters that determine the design of a remote seal transmitter

Location of the transmitter (indoor versus outdoor).
Temperatures (process and ambient).
Exposure to vacuum.
Pressure (operating and maximum).
Length of capillary.
Type of seal desired.
Process connection, material of construction and similar considerations.
Installation requirements.
Measurement span.

When are threaded connections used with diaphragm seals?

The combinations of diaphragm seals with threaded connection can be used for processes with extreme temperatures and with aggressive, adhesive, corrosive, environmentally hazardous or toxic media.

Why are there different system fill fluids with diaphragm seals?

In selecting the system fill fluid for diaphragm seals, factors such as compatibility (physiologically harmless) and also temperature and pressure conditions at the measurement location are of crucial importance. Depending on the system fill fluid, the appropriate minimum and maximum operating temperature range must be observed.

How are the diaphragm seals connected?

The diaphragm seals are available with female or male thread in their basic design. Due to the wide variety of available process connections they can be mounted to many different connections without any problems. Generally these connections are T-pieces which are integrated into a pipeline or welded to a pipeline by means of a welding socket.

Sino-Instrument offers SMT3151 Diaphragm Seal Pressure transmitter. Work the same as Wika diaphragm seal pressure transmitter; diaphragm seal pressure transmitter Rosemount; Yokogawa diaphragm seal pressure transmitter.

Sino-Instrument are diaphragm seal pressure transmitters manufacturer. We can offer you automated instruments from China, With best price.

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KimGuo11

drurylandetheatre.com

SMT3151TR Hydrostatic Submersible Level Transmitter-Straight Rod Insertion

Posted on May 28, 2019 by KimGuo11

The Submersible Level Transmitter is the most commonly used tank level indicator. There are stainless steel probes that are placed at the bottom of tanks, wells, or other liquid containers. Output 4-20mA signal. For liquid level measurement and control.

The difference between the SMT3151TR Hydrostatic Submersible Level Transmitter and other submersible level transmitters is that it is a straight rod insertion type.

Measuring range: select within 0 ～ 5m (more than 5m negotiate order)
Measurement accuracy: 0.5
Output signal: 4 ～ 20mADC; 0 ～ 20mA;
Working temperature: -50 ～ 80 ℃/ -50~450℃ （High temperature type）;
Wetted materials: stainless steel, polypropylene (PP), PTFE
Explosion-proof grade: ExiaIICT6Gb ExIICT6Gb

Sino-Inst offers a variety of Hydrostatic Submersible Level Transmitters for flow measurement. If you have any questions, please contact our sales engineers.

Request a Quote

Hydrostatic Level

Features of Hydrostatic Submersible level transmitter

Solid structure, no moving parts, high reliability and long service life;
From water to sewage, from oil to liquid with high viscosity, high-precision measurement can be carried out, and it is not affected by foaming and sedimentation of the medium;
With multi-purpose mounting bracket, easy to install and use;
Lightning protection design. Has good anti-interference and lightning protection capabilities;
With power reverse polarity protection and overload current limit protection;
The new material is not easy to fatigue and wear, and has strong resistance to vibration, impact and overload]
High temperature type can be customized. High temperature reaches 450 ℃.

Extended reading: HART protocol digital signal (two-wire system)

Specifications of Submersible Level Transmitter

Measuring range:	0~5m
Accuracy:	0.5
Signal output:	4~20ADC, 0~20mA
Loading resistance:	0~600Ω
Transmitting distance:	>1000m
Working voltage:	24VDC
Working temperature:	-50~ +80 °C; -50~ +450 °C;
Environmental temperature:	-40~ +50 °C
Relative humidity:	≤85%
Contacting liquid material:	Stainless steel
Installation type:	Flange: DN32 (HG/T20593,20595-97) RF sealing face ； G2″ thread（customize）
Electrical connection:	M20×1.5
Explosion-proof grade:	Exia II CT6Ga; Exd II CT6Gb

Applications of Submersible Level Transmitter

Sino-Inst’s Hydrostatic Level Transmitter is used in various industrial and municipal environments. Especially in water supply and wastewater treatment plants. Mainly used for water level measurement of urban water supply, oil tanks, petrochemical and other open tanks.

Hydrostatic Level Transmitter measures the hydrostatic pressure of a liquid medium. Liquid level information is transmitted through electrical signals. The signal changes linearly and proportionally. To measure the hydrostatic pressure above the sensor.

If your measurement range is greater than 5 meters, please refer to Submersible Pressure Transducer.

Level measurement in rivers and lakes
Level measurement in vessel and storage systems
Control of sewage lift and pumping stations
Monitoring of sewage, settling and stormwater retention basins

If you are measuring the fuel tank level, you can choose a magnetostrictive liquid level sensor with higher accuracy and longer service life.

More Featured Hydrostatic Level Transmitters

**SI-PCM261 Submersible Pressure Transducer**

**SI-PCM260 Deep Well Water Level Sensor**

Installation of Submersible Level Transmitter

The rod type static pressure liquid level transmitter has two standard installation methods of G11 / 2 thread and flange.

Thread installation
For the transmitter that is directly installed with G11 / 2 thread, a G11 / 2 round nut is provided at the time of delivery. Generally, there are two ways for installation.

The installation position has G11 / 2 thread. The liquid level transmitter can be screwed in directly. The attached round nut can be used or screwed on to prevent loosening.
There is no G11 / 2 thread in the installation position. Can use the existing Φ50 ~ Φ60 light hole, or install a bracket with Φ50 ~ Φ60 hole. Install the liquid level transmitter, and screw on the round nut to fix it.

Flange mounting
The standard installation dimensions of flanges are in accordance with DN50, GB9119.6-88
If there are other flange mounting holes in the installation location, please indicate the flange size or the corresponding specifications and standard numbers when ordering, in order to meet the installation requirements.

Of course, we can also directly measure the liquid level with a pressure transmitter. For example, install a Hydrostatic pressure transmitter directly at the bottom of the tank. The installation is shown on the right.
If you want to measure the tank liquid level like this, you can refer to:

**Hydrostatic Pressure Sensor/Transmitter**

What is hydrostatic level transmitter?

Hydrostatic level transmitter is actually a type of pressure transmitter. Hydrostatic level transmitter is the application of pressure transmitter to liquid level measurement. The submersible Hydostatic pressure level transmitter is based on the principle that the measured liquid static pressure is proportional to the height of the liquid. Piezoresistive effect using diffused silicon or ceramic sensitive elements. Convert static pressure into electrical signal. After temperature compensation and linear correction. Convert to 4-20mADC standard current signal output. In order to achieve liquid level measurement.

Submersible level transmitter working principle

The basic working principle of Hydrostatic Level Sensor is static pressure level measurement.

In liquid, the pressure generated at a certain depth is generated by the weight of the medium itself above the measurement point. It is proportional to the density of the medium and the local acceleration of gravity.

The formula P = ρgh reflects the proportional relationship between them.

Where P = pressure, ρ = medium density, g = gravity acceleration, h = depth of measurement point.

Therefore, the physical quantity measured by the input liquid level gauge is actually pressure. It can be understood by the calibration unit mH2O of the input level gauge. The actual liquid level must be obtained by conversion after knowing the two parameters of density and gravity acceleration. In the industrial field, such conversion is usually performed by a secondary instrument or PLC.

The Hydrostatic Level Sensor mainly measures corrosive liquids such as hydrochloric acid, hydrogen peroxide, etc. Or chemical and electroplating wastewater. Mainly used in measuring corrosive media. It has the advantages of strong corrosion resistance and stable performance.

Let’s see How is hydrostatic pressure measured ?

Video source: https://www.youtube.com/watch?v=T2OPoEod_jM&feature=emb_logo

Hydrostatic level transmitter advantages and disadvantages

About Hydrostatic level transmitter advantages and disadvantages, we do a simple analysis here. If you want to know more about the advantages and disadvantages of level transmitters. Please refer to Sino-Inst Level Transmitters.

Advantages

High measurement accuracy;
The ultra-high range can be customized up to 1000 meters.
Easy to install;
The signal can be transmitted remotely;
The corrosion of various media can be resisted by choosing different materials;
Suitable for explosion-proof occasions;
Low cost;

Disadvantages

The measurement signal needs to be converted;
When the measuring range is greater than 5 meters, it is impossible to measure the high temperature medium temperature exceeding 125 ℃;
The density of the measuring medium must be uniform.

Extended reading: Hydrostatic Pressure Transmitter

Hydrostatic level transmitter price

Compared with other liquid level transmitters, Hydrostatic level transmitter has lower cost. The price of Hydrostatic level transmitter is mainly affected by the measurement situation. such as:

Range range;
Medium temperature;
The medium is corrosive;

Sino-Inst is a manufacturer of Hydrostatic level transmitter. Sino-Inst provides customers with the best Hydrostatic level transmitter price. For example, the general-purpose Hydrostatic level transmitter has a reference price of USD70. If you want to know the exact price, please contact our sales engineer.

Sino-Instrument offers detailed product specifications and data sheets for review. Our application engineers, can help ensure you choose exactly what you need for your specific installation. Or if you need the RFQ instantly, we can offer you with the submersible level transmitter price immediately.

Submersible level transmitter Download

Frequently
Asked
Questions

Help Center

Magnetostriction means that the change of the magnetization direction in ferromagnetic substance will cause the change of the medium lattice spacing. As a result, the length and volume of the ferromagnetic substance change.
Magnetostrictive level transmitter is a level transmitter based on the principle of magnetostriction. It is a high-precision, high-resolution transmitter driven by a magnetic float.

Ultrasonic Level Indicator, also called Ultrasonic level sensor, or ultrasonic level transmitter. In this type of transmitter, an ultrasonic transducer is mounted at, or near the top of a container containing liquid. The transducer sends out an ultrasonic pulse. The pulse hits the surface of the liquid, and gets reflected. The sensor then calculates the fill level based on the time between the transmitted and received signal.

Sino-Inst offers over 10 Submersible Level Transmitters. About 50% of these are Submersible Level Sensors, 40% are water level meters, and 40% are for tank level. A wide variety of Hydrostatic Level Sensor options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Hydrostatic level transmitter.
Submersible Level Transmitter instrumentation, located in China.

Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. Submersible Level Transmitter products are most popular in Domestic Market, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers, with ISO9001,ISO14001 certification.Send RFQ NOW, You may get the price now.

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KimGuo11

drurylandetheatre.com

3051HP Hydrostatic Pressure Transmitter

Posted on May 27, 2019 by KimGuo11

What is hydrostatic pressure transmitter?

Hydrostatic Pressure Transmitters is an instrument that measures the hydrostatic pressure or differential pressure exerted by a hydrostatic head.

Feel the measured pressure through the remote transmission device installed on the pipeline or container. The pressure is transmitted to the main body of the transmitter through the filling silicone oil (or other liquid) in the capillary tube. Then there is the delta chamber and the amplifier circuit board in the main body of the transmitter. Convert into 4-20mA DC signal output. HP Smart can communicate with a HART handheld communicator. Use it to set, monitor, or form an on-site monitoring system with the host computer.

Hydrostatic Pressure Transmitters are often used to measure the level, flow, and pressure of liquids, gases, or steam under high working pressure environments.

RFQ

Pressure Transmitters

Features
Specifications
Applications

Features of Hydrostatic Pressure Transmitter

The Hydrostatic pressure transmitter is used to measure the liquid level, flow, and pressure of the liquid, gas or steam under high working pressure, and then convert to 4~20mA DC signal output.

The high hydrostatic pressure transmitter can measure differential pressure below 32MPa hydrostatic pressure.
With 32MPa working pressure and overload protection.
Ensuring reliable application of the transmitter in Hydrostatic pressure systems.

Specifications of Hydrostatic Pressure Transmitter

Measure Range of Hydrostatic pressure sensor:

Differential pressure: 0-1.3-6790KPa
Hydrostatic pressure: 32MPa

Use object: liquid, gas or steam
Output signal: 4-20mA dc. Output superimposed HART protocol digital signal (two-wire system)
Power source: external power supply 24V dc. Power supply range 12V ~ 45V
Installation in dangerous places:
- Flameproof ExdIIBT5Gb;(explosion-proof certificate no. :CE16.1163)
- Intrinsically safe ExiaIICT4/T5/T6Ga;（explosion-proof certificate no. : CE15.2354X） ;
Accuracy: ± 0.1%, ±0.2%
Stability: ±0.25%/6 months of maximum range

Model	Transmitter type
HP	Absolute pressure transmitter
Code	Scale range
2	0-0.10～3.5kPa(0-10～350mmH₂O)
3	0-0.8～8.0kPa(0-80～800mmH₂O)
4	0-4.0～40kPa(0-400～4000mmH₂O)
5	0-20～200kPa(0-2000～20000mmH₂O)
6	0-70～700kPa(0-0.7～7kgf/cm²)
7	0-210～2100kPa(0-2.1～21kgf/cm²)
8	0-700～7000kPa(0-7.0～70kgf/cm²)
9	0-2.1～21MPa(0-21～210kgf/cm²)
0	0-4.1～41MPa(0-41～4100kgf/cm²)
Code	Output form
E	Linear output 4-20mAdc
SF	Linear/square root output 4-20mAdc +HART signal,，Full function buttons on site
F	MODBUS-485 signal
Code	Structural materials
	Flange connector	Exhaust/Drain valve	Isolation diaphragm	Filling liquid
22	316 Stainless steel	316 Stainless steel	316 Stainless steel	Silicone oil
23	316 Stainless steel	316 Stainless steel	Hastelloy C	Silicone oil
24	316 Stainless steel	316 Stainless steel	Monel	Silicone oil
25	316 Stainless steel	316 Stainless steel	Tantalum	Silicone oil
33	Hastelloy C	Hastelloy C	Hastelloy C	Silicone oil
35	Hastelloy C	Hastelloy C	Tantalum	Silicone oil
44	Monel	Monel	Monel	Silicone oil
Code	Shell material	Conduit inlet dimensions
A	Low copper aluminum alloy polyurethane coating	M20×1.5
B	Low copper aluminum alloy polyurethane coating	1/2-14 NPT
C	Stainless steel	M20×1.5
D	Stainless steel	1/2-14 NPT
Code	Pressure connection
L1	1/4NPT-18 Internal thread（excluding waist joint standard）
L2	1/2NPT-14 Internal thread
L3	M20×1.5 External thread
Code	Optional parts
M4	LCD multi-power digital display head
B1	Pipe bending bracket
B2	Plate bending bracket
B3	Pipe mounting bracket
C02	M20×1.5 nut and Φ 14 pressure short tube
C12	1/2NPT-14 external thread and Φ14 pressure short tube
C22	1/4NPT-18 external thread and Φ14 pressure short tube
C32	1/4NPT-18 to M20×1.5 external thread
C42	1/2NPT-14 to M20×1.5 external thread
C43	1/2NPT-14 to 1/4NPT-18 internal thread
C44	1/2NPT-14 to 1/2NPT-14 external thread
C45	1/2NPT-14 to G1/2 external thread
D1	The side discharge valve is on the upper part
D2	The side discharge valve is on the upper part
X1	Oil ban
Da	Flameproof ExdIIBT5Gb;(explosion-proof certificate no. : CE16.1163)
Fa	Intrinsically safe ExiaIICT4/T5/T6Ga;(explosion-proof certificate no. : CE15.2354X)

Hydrostatic Pressure Transmitter Applications

Viscous medium at high temperature
Crystallizable medium
Precipitating medium with solid particles or suspended matter
Strong corrosive or highly toxic medium
It can eliminate the phenomenon that the pressure guiding tube leaks and pollutes the surrounding environment. It can avoid the instability of the measurement signal when the isolation fluid is used. The tedious work of frequently supplementing the isolation fluid is required.
Continuous and accurate measurement of interface and density
The remote transmission device can avoid the mixing of different instantaneous media. So that the measurement result truly reflects the actual situation of the process change.
Occasions requiring high hygiene and cleanliness
For example, in the production of food, beverage and pharmaceutical industries, it is not only required that the parts of the transmitter contacting the medium meet the hygienic standards. It should also be easy to wash. To prevent cross-contamination of different batches of media.

Extended reading: Silicon Pressure Sensor

Hydrostatic Pressure

Hydrostatic pressure is the pressure generated by the weight of the liquid above the measurement point when the liquid is stationary. The height of the liquid column with uniform density is proportional to the hydrostatic pressure. As the weight of the fluid exerting downward force from above increases, the hydrostatic pressure increases in proportion to the depth measured from the surface.

If the fluid is inside the container, the depth of the object placed in the fluid can be measured.
The hydrostatic characteristics of a liquid are not constant, and the main factors affecting it are the density and local gravity of the liquid. In order to determine the hydrostatic pressure of a particular liquid, both quantities need to be known.

The deeper an object is placed in a fluid, the greater the pressure it bears. This is because the weight of the fluid is higher than its weight. Due to the weight of the fluid, the denser the fluid above it, the greater the pressure on the submerged object.

Measuring principle

The pressure in the liquid increases as the filling height increases. The hydrostatic pressure is transmitted to the measuring unit through the stainless steel diaphragm. Bubbling, accumulation of liquids, fluctuating electrical characteristics, and container design will not affect the measured value.

Extended reading: What is flush diaphragm?

Formula for calculating hydrostatic pressure

The formula for calculating the hydrostatic pressure of a column of liquid is:

P_hyd = h.ρ.g

P_rel = h.ρ.g

P_abs = h.ρ.g + P_atm

P_hyd = Hydrostatic Pressure (Pa)
Prel = Relative Pressure (Pa)
Pabs = Absolute Pressure (Pa)
Patm = Atmospheric Pressure (Pa)
h = Liquid Height (m)
ρ = Liquid Density (kg/m3)
g = Local Gravity (m/s2)

The above calculation formula is also the working principle of hydrostatic liquid level sensor.

The hydrostatic pressure sensor measures the hydrostatic pressure applied by the hydrostatic head. Output 4-20mA.
Use a hydrostatic pressure transmitter to measure the storage tank and pump inlet. And other applications where hydrostatic pressure is used to determine the liquid level.

Hydrostatic Pressure Sensor/Transmitter can also be used with paperless recorder.

Hydrostatic Level Sensor measures the hydrostatic pressure by the submersible pressure sensor. The static pressure of the liquid is proportional to the height of the liquid. Then the static pressure was converted into an electrical signal. Convert to analog signal output or 4-20mADC. With digital display. For water level measurement, hydrostatic level sensor is a low cost type. Different types of measuring cells are used in level measurement based on the hydrostatic principle.

Lightning protection, anti-corrosion, explosion-proof optional. IP68 is optional.

Read more about: Hydrostatic Level Sensor

The basic working principle of Hydrostatic Level Sensor is static pressure level measurement.

The formula P = ρgh reflects the proportional relationship between them.

Where P = pressure, ρ = medium density, g = gravity acceleration, h = depth of measurement point.

Extended reading: Static pressure vs dynamic pressure vs total pressure

There are various methods and techniques for measuring fluid level using hydrostatic pressure sensors. Depending on the installation, they all have advantages and disadvantages. Hydrostatic pressure measurement is an accurate and convenient technique for determining fluid height or volume.

Let’s take a look at each according to the installation location of the hydrostatic pressure sensor.

Externally mounted type

Image source: https://www.yourlevelexperts.com/zh-hant/product/hydrostatic-pressure/

The Hydrostatic pressure liquid level sensor can be installed to the outside of the container through threads or flange fittings. If necessary, capillaries can also be used.

Submersible type

If the externally mounted sensor is not available, a submersible pressure sensor can be used. The electrical connection with IP68 rating is suitable for long-term permanent immersion. The electronic equipment of the sensor can be protected from the external environment.

**Remote Diaphragm Seal Pressure Transmitter**

**SMT3151LT Pressure Level Transmitter**

DP transmitters are Differential Pressure Transmitters. DP transmitter measures the pressure difference between the gas or liquid at both ends of the transmitter. Output 4~20mA, 0~5V. Used for liquid level, density, and pressure of liquid, gas, and steam.

DP transmitters are different from pressure transmitters as they have 2 pressure interfaces. With flanges, capillaries, valves, brackets, throttle devices. Differential pressure transmitters are used to measure the level, density, and flow of liquids, gases, and vapors. Then convert it into 4–20mADC current signal output.

Hydrostatic pressure transmitter fault debugging steps:

How to debug the fault of Hydrostatic pressure transmitter

Total Time: 30 minutes

Check the power supply

Check if the power supply of the differential pressure transmitter is reversed, and whether the positive, and negative poles of the power supply are connected correctly.

Measure the power supply

Measure the power supply of the transmitter, whether there is 24V DC voltage. It must ensure that the power supply voltage to the transmitter is ≥12V
(that is, the voltage of the transmitter power input terminal is ≥12V).
If there is no power supply, check whether the circuit is disconnected, whether the instrument is selected incorrectly (input impedance should be ≤250Ω), and so on.

Check the display meter

If the pressure transmitter is equipped with a meter head, it is necessary to check whether the dislay meter is damaged. You can short-circuit the two wires of the meter head first. If it is normal after a short circuited, it means the head is damaged.
If the meter head is damaged, Then you need to change the header.

Check the current

If there is a problem with the differential pressure transmitter, connect the ammeter to the 24V power supply circuit to check if the current is normal.
If it is normal, the transmitter is normal. In this case, check if other instruments in the loop are normal.

Connect the power supply

Connect the power supply to the transmitter power input terminal, and connect the power cable to the power supply wiring port.
If you still have any question with the selection, application, and use of pressure transmitters, you can just contact our engineer today.

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Hydrostatic pressure transmitter/sensor measures the level, density, and pressure of liquid, gas, or steam. And then converts it into a 4-20 mA DC signal output. The Hydrostatic pressure transmitter can communicate with the HART communicator intelligently. Use it to set, monitor or form a site monitoring system with the host computer. Use a Hydrostatic pressure sensor to measure tanks, processing vessels, headers, pump inlets and others using hydrostatic pressure to determine the liquid height. SI3051HP Hydrostatic pressure transmitters, with working Hydrostatic pressure up to 32Mpa.

Extended reading: Best Price Ceramic Pressure Sensor

Sino-Inst offers a variety of Hydrostatic Pressure Transmitters for industrial pressure measurement. If you have any questions, please contact our sales engineers.

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KimGuo11

drurylandetheatre.com

OEM Pressure Sensor-General Industrial Applications

Posted on May 27, 2019 by KimGuo11

OEM Pressure Sensor is an economical product. It uses all stainless steel wetted parts, has a compact size and high cost performance.

This pressure transmitter measures gauge pressure and absolute pressure. The measurement system is fully welded and can be used for most liquid and gas media. This series provides a variety of electrical outputs as well as electrical connections and pressure interfaces to meet most application requirements. The compact structure is very suitable for installation in a small space.

Sino-Inst offers a variety of OEM pressure senors for industrial pressure measurement. If you have any questions, please contact our sales engineers.

Industrial OEM Pressure Sensor Features

Measuring range: 0-0.6,1,2,5,10,20,30,40,50,60 ～ 150MPa;
Available in gauge, absolute and sealed gage styles;
Constant current / constant voltage power supply;
Isolated structure, suitable for a variety of fluid media;
Standard OEM pressure sensitive element;
All 316L stainless steel;
Tantalum diaphragm optional, titanium structure optional;
Standard male thread pressure connection available;
Flexible customer customization ;

Specifications

Measuring range: 0-0.6,1,2,5,10,20,30,40,50,60 ～ 150MPa
Comprehensive accuracy: 0.1% FS, 0.25% FS, 0.5% FS
Output signal: 1.0mV / V, 1.5mV / V, 2.0mV / V
Power supply voltage: 10VDC (3 ～ 15VDC)
Output impedance: 350/1000/1650 / 2000Ω
Medium temperature: -20 ～ 85 ℃ ～ 125 ℃
Ambient temperature: -20 ～ 85 ℃
Insulation resistance: greater than 2000MΩ / 100VDC
Response time: <1-5ms
Sealing grade: IP65
Long-term stable performance: 0.15% FS / year
Vibration effect: within the mechanical vibration frequency of 20Hz ~ 1000Hz, the output change is less than 0.1% FS
Electrical connection: red-positive power, black (yellow)-negative power, blue-positive signal, white-negative signal
Mechanical connection: M20 × 1.5, other threads can be customized according to customer requirements

5 Types of Industrial Pressure Sensors

Piezoelectric pressure sensor:

Piezoelectric effect is the main working principle of piezoelectric sensors. Piezoelectric sensors cannot be used for static measurement. Because the charge after external force is applied, it can only be saved when the loop has infinite input impedance. This is not the case, so this determines that piezoelectric sensors can only measure dynamic stress.

Ceramic pressure sensor:

Ceramic pressure sensors are based on the piezoresistive effect. Pressure directly acts on the front surface of the ceramic diaphragm, causing the membrane to deform slightly. Thick film resistors are printed on the back of the ceramic diaphragm and connected into a Wheatstone bridge. Because of the varistor The piezoresistive effect makes the bridge generate a voltage signal that is highly linear and proportional to the pressure and proportional to the excitation voltage. The standard signal is calibrated to 2.0 / 3.0 / 3.3mv / v according to different pressure ranges. Strain sensors are compatible.

Diffused silicon pressure sensor:

The working principle of a diffused silicon pressure sensor is also based on the piezoresistive effect. Using the piezoresistive effect principle, the pressure of the measured medium directly acts on the diaphragm of the sensor (stainless steel or ceramic). The diaphragm produces a micro-displacement proportional to the pressure of the medium. Change the resistance value of the sensor. Use electronic circuits to detect this change, and convert and output a standard measurement signal corresponding to this pressure.

Sapphire pressure sensor:

Utilizing strain-resistance working principle. Using silicon-sapphire as the semiconductor sensitive element has unparalleled metrological characteristics. Therefore, silicon-sapphire semiconductor sensitive components are used. They are not sensitive to temperature changes and have good working characteristics even under high temperature conditions. Sapphire has extremely strong radiation resistance. In addition, silicon-sapphire semiconductor sensitive components, pn drift.

Piezoresistive force sensor:

Resistance strain gage is one of the main components of a piezoresistive strain sensor. The working principle of a metal resistance strain gage is that the resistance of the strain resistance absorbed by the base material changes with the mechanical deformation.

Applications of OEM pressure sensor

Industrial process control: liquid level measurement, gas, liquid pressure measurement;

Pressure testing instruments: pressure calibration instruments, hydraulic systems and switches; refrigeration equipment and air conditioning systems, aviation and marine testing.

OEM pressure transmitter manufacturer in China

Sino-Inst sensors are produced in three basic configurations: gauge pressure sensors, absolute pressure sensors and sealed gauge pressure sensors.

A large percentage of OEM pressure sensors produced by Sino-Instrument, are used in our own pressure transducers, and pressure transmitters, so Sino-Inst understands the OEM viewpoint.

Whatever the need, Sino-Inst can provide the solution!

Request a Quote

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KimGuo11

drurylandetheatre.com

SMT3151AP Absolute Pressure Transmitter

Posted on May 24, 2019 by KimGuo11

Absolute pressure transmitters measure the absolute pressure of the medium in the equipment. Its reference pressure is the absolute value 0 (vacuum), which has nothing to do with atmospheric pressure. Therefore, there is a vacuum sealed chamber on the low-pressure side of the pressure core.

When the fluctuation amplitude of the actual atmospheric pressure affects the process parameters beyond the allowable range, the use of absolute pressure transmitters is necessary. For example, in places where the local average atmospheric pressure deviates greatly from the standard atmospheric pressure.

Sino-Inst offers a variety of pressure senors for industrial pressure measurement. If you have any questions, please contact our sales engineers.

Absolute Pressure Transmitter Features

Direct Mount Pressure-Absolute Pressure Transmitter

Sensor Type : Industrial Pressure Transducers
Full function buttons on site
Pressure ranges: 0 … 1 mbar up to 0 … 600 bar
Output/Span : 0 – 10 V, 0 – 5 V, 1 – 5 V, 10 mV/V, 4 – 20 mA, HART
Pressure Port/Fitting : 1/2 MNPT, 1/4 FNPT, 1/4 MNPT, 1/8 MNPT
Operating Temperature Range: -40 – 85 °C [ -40 – 185 °F ]

Extended reading: How to calibrate HART pressure transmitters

Specifications

Application:	Liquid, gas or steam
Measurement range:	0-41MPa
Output signal:	4~20mAdc. output, superimposed HART protocol digital signal (two-wire system)
Power supply:	External power supply 24Vdc., power supply range 12V~45V
Hazardous location installation:	Explosion-proof type ExdIIBT5Gb; Intrinsically safe type ExialCT.4/T5/T6Ga;
Migration characteristics:	At the minimum range (range compression ratio is 40:1), the maximum positive migration zero point is 39/40 times the upper limit of the range. The maximum negative migration zero point can be the lower limit of the range. The absolute pressure transmitter has no negative migration. (No matter what the output form is, after the positive and negative migration, the upper and lower limits of the range shall not exceed the range limit)
Temperature range:	The electronic circuit board works at -40~85℃; the sensitive element works at -40~104℃; the storage temperature works at -40~85℃: with digital display works at -25~75℃ (operation); -40~85℃ (no damage)
Relative humidity:	0~95%
Overpressure limit:	Range 3 to 8 withstand 0 (absolute pressure) ~13.78MPa, pressure transmitter without damage; range 9 pressure does not exceed 31.29MPa; range 0 pressure does not exceed 51.4MPa: normal working pressure is 3.43kPa (absolute pressure) to the upper limit of the range.
Volume change:	Less than 0.16cm3
Damping:	The time constant is adjustable between 0.2~32.0s.
Accuracy:	±0.1%, ±0.075%
Stability:	±0.1% of the maximum range/12 months
Temperature effect:	The temperature error including zero point and range is ±0.2% of the maximum range/20℃
Power supply effect:	Less than 0.005%/V of the output range.
Vibration effect:	In any axis, the frequency is 200Hz, and the error is ±0.05%/g of the maximum range.
Load effect:	As long as the voltage of the input transmitter is higher than 12V, there is no load influence in the load working area.
Installation position effect:	The maximum zero position error that can be generated is no more than 0.2kP, which can be eliminated by correction without affecting the range; the rotation of the measuring body relative to the flange has no effect.
Note: Under no migration, 316 stainless steel isolation diaphragm and other standard test conditions.

Order Guide

Model	Transmitter type
GP	Pressure transmitter
AP	Absolute pressure transmitter
Code	Scale range
2	0-0.10～3.5kPa(0-10～350mmH2O)
3	0-0.8～8.0kPa(0-80～800mmH2O)
4	0-4.0～40kPa(0-400～4000mmH2O)
5	0-20～200kPa(0-2000～20000mmH2O)
6	0-70～700kPa(0-0.7～7kgf/cm2)
7	0-210～2100kPa(0-2.1～21kgf/cm2)
8	0-700～7000kPa(0-7.0～70kgf/cm2)
9	0-2.1～21MPa(0-21～210kgf/cm2)
0	0-4.1～41MPa(0-41～4100kgf/cm2)
Code	Output form
E	Linear output 4-20mAdc
SF	Linear output 4-20mAdc+HART signal，Full function buttons on site
F	MODBUS-485 signal

Code	Pressure connection
L1	1/4NPT-18 Internal thread (excluding waist joint standard)
L2	1/2NPT-14 Internal thread
L3	M20×1.5 External thread
Code	Optional parts
M4	LCD multi – power digital display head
B1	Pipe bending bracket
B2	Plate bending bracket
B3	Pipe mounting bracket
D0	The discharge valve is at the end
D1	The side discharge valve is on the upper part
D2	The side discharge valve is on the upper part
C02	M20 x 1.5 nut and Φ 14 pressure short tube
C12	1/2NPT-14 external thread and Φ14 pressure short tube
C22	1/4NPT-18 external thread and Φ14 pressure short tube
C32	1/4NPT-18 to M20×1.5 external thread
C42	1/2NPT-14 to M20×1.5 external thread
C43	1/2NPT-14 to 1/4NPT-18 internal thread
C44	1/2NPT-14 to 1/2NPT-14 external thread
C45	1/2NPT-14 to G1/2 external thread
X1	Oil ban
Gd	Measure the gold-plated membrane box
Da	Flameproof ExdIIBT5Gb;(explosion-proof certificate no. : CE16.1163)
Fa	Intrinsically safe ExiaIICT4 / T5 / T6Ga;(explosion-proof certificate no. : CE15.2354X)

Code	Flange connector	Exhaust/Drain valve	Isolation diaphragm	Filling liquid
22	316 Stainless steel	316 Stainless steel	316 Stainless steel	Silicone oil
23	316 Stainless steel	316 Stainless steel	Hastelloy C	Silicone oil
24	316 Stainless steel	316 Stainless steel	Monel	Silicone oil
25	316 Stainless steel	316 Stainless steel	Tantalum	Silicone oil
33	Hastelloy C	Hastelloy C	Hastelloy C	Silicone oil
35	Hastelloy C	Hastelloy C	Tantalum	Silicone oil
44	Monel	Monel	Monel	Silicone oil
Code	Shell material	Conduit inlet dimensions
A	Low copper aluminum alloy polyurethane coating	M20×1.5
B	Low copper aluminum alloy polyurethane coating	1/2-14 NPT
C	Stainless steel	M20×1.5
D	Stainless steel	1/2-14 NPT

Read more about: Common Units Of Pressure

What is the absolute pressure?

The pressure expressed with complete vacuum as the zero standard is called absolute pressure. Absolute pressure has only positive values.

What is absolute pressure transmitter?

Absolute pressure (AP) transmitter measure relative to perfect (full) vacuum pressure (absolute zero pressure).

Therefore, AP transmitters are not affected by fluctuations in the local atmosphere.

All absolute pressure measurements are positive. The letter ‘a’ or the abbreviation ‘abs’ in the unit of measure (i.e., inH₂O(abs) or psia) indicates an absolute pressure measurement.

Any critical storage and delivery (toxic gases) will change due to atmospheric conditions. So these systems must be accurate and use static references.

Absolute pressure transmitters are used in applications where the pressure of a gas or liquid is isolated from changes in atmosphere. For example, when testing a sealed pressure vessel for leaks for a long time.

How do absolute pressure sensors work?

The absolute pressure transmitter is mainly composed of two parts. One part is directly connected to the side to be measured. The other side is designed as an absolute vacuum reference chamber. This makes the two compartments form Absolute pressure. When the pressure on both sides is inconsistent, the difference signal will be transmitted through a special transmission line. The computer system in the background can calculate the difference. The pressure value on the measured side is directly displayed.

Applications for Absolute Pressure Sensors

Absolute pressure sensors and absolute pressure gauges are often used for industrial high-performance vacuum pumps that need to be monitored.
It is used to vacuum pack medical products in a clean environment. To ensure hygienic and sterile delivery to hospitals and doctors.
In the food industry, vacuum packaging can be used when the highest possible vacuum is required to prevent oxygen from deteriorating perishable foods. This greatly extends the flavor and shelf life of the product.
In meat packaging, a vacuum that meets the requirements must be generated. This can safely guarantee the longest shelf life.
And pressure sensors affected by the atmosphere cannot monitor the high end of the vacuum.
Applications that require true absolute pressure sensors and instruments can also be found in scientific laboratories, universities, military and aerospace industries.

Sino-Inst supplies Direct Mount Pressure / Absolute Pressure Transmitter.

SM3151 TAP Pressure-absolute pressure transmitter shape and installation dimensions

Absolute pressure transmitter calibration

First make a 4-20mA fine adjustment. It is used to calibrate the D / A converter inside the transmitter. Because it does not involve sensing components, no external pressure signal source is required.
Do a full fine-tuning again. Make the 4-20mA, digital reading coincide with the actual applied pressure signal. Therefore, a pressure signal source is required.
Finally, re-quantify the range. By adjusting the analog output 4-20mA and the external pressure signal source. Its function is exactly the same as the zero (Z) and range (R) switches on the transmitter shell.

Absolute pressure transmitter VS Gauge pressure transmitter

Absolute pressure transmitter

Absolute pressure transmitter can realize absolute pressure measurement in equipment such as degassing system, distillation tower, evaporator and crystallizer, and allows pressure under 10Mpa. The δ chamber side of the absolute pressure transmitter receives the measured absolute pressure signal. The other side is sealed into a high vacuum reference chamber. Then convert it into 4 ~ 20mA DC signal output.

Gauge pressure transmitter

A gauge pressure transmitter in the general sense is mainly composed of a load cell sensor (also called a pressure sensor), a measurement circuit and a process connection. It can convert the physical pressure parameters such as gas and liquid felt by the load cell sensor into standard electrical signals (such as 4 ~ 20mADC, etc.), and provide secondary indicators such as alarm indicators, recorders, and regulators for measurement and indication. And process regulation.

More Featured Pressure Transmitters and Pressure Measurement Solutions

**SI-703 Flush diaphragm pressure sensor**

**SI-PT series Melt Pressure Sensors/Transducers – High Temperature**

**SI-706 Combined Pressure and Temperature Sensor-Dual function**

**SI-512H High Temperature Pressure Sensor**

**High Frequency Dynamic Pressure Sensor**

Sino-Inst is Chinese manufacturer of absolute pressure transmitters. SMT3151AP absolute pressure transmitters, are our main products, which are widely used in USA, South Africa, and other countries.

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KimGuo11

drurylandetheatre.com

SI-2088 High Temperature Pressure Transducer

Posted on May 24, 2019 by KimGuo11

High Temperature Pressure Transducer is specially used for high temperature medium pressure measurement. Such as high temperature liquid, gas, steam, etc. The highest temperature is customized to 850℃.

High temperature resistant pressure sensor is selected as the signal measurement element. The transmitter structure includes a heat dissipation structure, and the high-precision signal processing circuit is located in the stainless steel housing. The sensor output signal is converted into a standard output signal, such as 4-20mA.

Sino-Inst is a manufacturer of high temperature pressure transducer in China. Committed to the manufacture, sales and engineering support of high temperature pressure sensors.

More Pressure Transmitters

Features of SI-2088 High Temperature Pressure Transducer

Working temperature –55 …850 ° C, customizable;
Pressure range can also be customized, such as 150MPa high pressure;
The sensor and pressure interface are fully welded structures, and the housing protection level is IP65;
The material in contact with the medium is stainless steel, which has good corrosion resistance;
It is suitable for pressure measurement of high temperature, low temperature and normal temperature media, and can work stably for a long time;
It is impact-resistant, vibration-resistant and corrosion-resistant;

High temperature pressure transducer for measuring lowest pressure fluctuations in a harsh environment up to 850 ° C. For applications in hazardous areas, the sensor is available with intrinsically safe Ex-ia and non-incendive Ex-nA certifications.

Specifications of High Temperature Transducer

Range:	0 ～ 1KPa ～ 10KPa ～ 400KPa, -0.1 ～ 0 ～ 1 ～ 60 (MPa), 0 ～ 10KPa ~ 100MPa, Other pressure ranges can be customized.
Comprehensive accuracy:	0.25% FS, 0.5% FS
Output signal:	4-20mA (2/4-wire system), 0-5 / 1-5 / 0-10V (3-wire system)
Power supply voltage:	24DCV (9 ～ 36DCV)
Medium temperature:	-30 ℃ ～ 160-350 ℃, customized up to 800 ℃.
Ambient temperature:	Normal temperature (-20 ～ 85 ℃)
Load resistance:	Current output type: maximum 800Ω; voltage output type: greater than 50KΩ
Insulation resistance:	Greater than 2000MΩ (100VDC)
Long-term stability:	0.1% FS / year
Vibration effect:	In the mechanical vibration frequency 20Hz ～ 1000Hz, the output change is less than 0.1% FS
Electrical interface:	Hessman connector (customizable)
Thread connection:	M20 × 1.5, etc. Other threads can be designed according to customer requirements
Dimensions:	M20 × Φ26.5 × 156
Shell protection:	Plug type (IP65); cable type (IP67)
Safety explosion-proof:	Ex iaⅡ CT5

Extended reading: High accuracy pressure transducers

Applications of high-temperature transmitters

SI2088 High Temperature Pressure Transducer used in the fields of steam, oil, boiler and heat energy exchange. Realize the measurement of liquid, gas and vapor pressure.

Application examples:

Industrial field process pressure detection;
Laboratory pressure calibration system;
Navigation and Shipbuilding;
Aviation and aircraft manufacturing;
Air separation equipment and thermal power unit;

Application of high-temperature transmitter

Extended reading: Common Pressure Sensor Applications

Application of high temperature pressure transmitter in steam pipeline

Pure steam pipes have good mechanical properties and thermal insulation properties. Under normal circumstances, it can withstand a high temperature of 120 ° C. It can withstand a high temperature of 180 ° C by modification or in combination with other thermal insulation materials.

It is suitable for thermal insulation of various cold and hot water high and low temperature pipelines. The pressure detection in the steam pipeline is very important. And because of the high temperature characteristics in the pipeline. Therefore, it is suitable to use the high temperature pressure transmitter designed by our company for such occasions.

Extended Reading: MEMS Pressure Sensors

In addition, in the steam system, water hammer (Water Hammer) is one of the main hazards causing casualties. Thereby eliminating the hazard of water hammer. This shows that daily pressure monitoring of the pipeline is very important.

Extended reading: High Temperature Flow Meter

Precautions for the correct use of steam pressure transmitters

   1. Prevent the steam pressure transmitter from contacting with corrosive or overheated media;
   2. Prevent dross from depositing in the conduit;
   3. When measuring gas pressure, the pressure port should be opened at the top of the pipeline, and the pressure transmitter should also be installed at the top of the pipeline, so that the accumulated liquid can be easily injected into the process pipeline;
   4. The pressure guiding pipe should be installed in a place with small temperature fluctuation;
   5. When measuring steam or other high-temperature media, a condenser such as a buffer tube (coil) should be connected, and the working temperature of the transmitter should not exceed the limit;
   6. When freezing occurs in winter, the transmitter installed outdoors must take anti-freezing measures to avoid the expansion of the liquid in the pressure port due to the frozen volume, resulting in the loss of the sensor;
   7. When wiring, pass the cable through the waterproof connector or the flexible tube and tighten the sealing nut to prevent the rainwater etc. from leaking into the transmitter housing through the cable.

High Temperature Pressure Transducers vs. Cooling Elements

Generally, the design method is to reduce the temperature near the pressure transmitter by incorporating mechanical cooling components to dissipate heat.

The cooling assembly may be filled with oil and isolated from the process medium by the isolation diaphragm.

Alternatively, the cooling assembly may include a hollow tube. The shape of the hollow tube is designed to increase heat transfer. This allows the process medium that is allowed to pass to be lowered to a much lower temperature.

The cooling element usually relies on the principle of convection heat transfer. This convective heat transfer principle is a mechanism for transferring heat due to the movement of fluid. In contrast, conductive heat transfer is the transfer of energy due to molecular vibration. In addition to cooling elements, convection is also used in many other engineering practices.

The cooling element may be able to reduce the temperature of the medium. This is usually a much cheaper solution than high temperature sensors. It is assumed that the medium density is not greatly affected by temperature changes within the normal operating range. Then this method can keep the pressure unchanged.

The cooling element usually works in air and water, but it is not suitable for oily media such as hydraulic oil. High temperature sensors must be used in these applications because the viscosity of this medium is highly temperature dependent.

The cooling element should be made of stainless steel so that most process media have maximum corrosion resistance. The nickel content of the steel is usually 1.25% and the chromium content is 0.65% to 0.8%.

The cooling element should withstand a maximum pressure of 5,000 psi at 38 ° C (100.4 ° F) and a maximum pressure of 3500 psi at 400 ° C (752 ° F). It also reduces the liquid process temperature at the sensing element from 260 to 38 ° C (500 to 100.4 ° F).

600 ℃ High Temperature Remote Pressure transmitter / Differential Pressure Transmitter

600 ℃ ultra-high temperature remote transmission pressure transmitter / remote transmission differential pressure transmitter cleverly uses the combination of ultra-high temperature silicone oil and internal isolation diaphragm. This makes the field application temperature greatly increased to about 600 ℃.

Greatly expanded the application range of ultra-high temperature pressure / differential pressure measurement. It can be widely used in coal chemical industry and CSP industry.

How to Select a Pressure Transducer For High Temperature Medium

Define your high temperature pressure transmitter requirements using this checklist:

Process temperature?
Cooling mechanism?
Ambient temperature?
Pressure range?
Output signal? 4-20mA
Electrical connection?
Process connection?
Process media type?

Featured Silicon Pressure Sensor

Posted on May 24, 2019 by KimGuo11

A Silicon Pressure Sensor is a pressure transmitter widely used in industry. It uses diffused silicon or ceramic piezoresistive sensors as pressure detection elements. It has strong overload capacity, good stability, and strong anti-interference ability. It has extremely high accuracy and repeatability, and the measurement interface has good corrosion resistance.

RFQ

Silicon Pressure Sensor Benefits

Silicon Pressure Sensor has a large signal output. It provides great advantages for the back-end transmission and conditioning circuit. It has high resolution and high sensitivity.
It can be compensated twice. The sensitivity temperature coefficient and zero temperature coefficient of Silicon Pressure Sensor can be compensated. Even the finished core can be compensated twice.
Silicon Pressure Sensors are relatively cheap and cost-effective.
The Silicon Pressure Sensor is small and easy to install. It can be installed and used in narrow locations.
316L stainless steel mechatronic structure with good durability.
Integrated dedicated chip, few discrete components, good temperature characteristics.

Industrial Silicon Pressure Sensor Technical Parameters

Pressure Media	Fluids, Gas
Supply Voltage	-30℃~160-350℃， customized up to -300~850℃
Operating Range	(Gage/Absolute Pressure)–Max(0～60)MPa, Min(0～0.5)KPa
Operating Range	(Negative Pressure)—Max(-100KPa～), Min(-0.2～0.2 )KPa
Accuracy	±0.5%(25℃)
Over Pressure	200% full scale
Long Term Stability	<0.25%FS per year
Response	<100ｍs
Output Signal	(4～20)mA+HART protocol（Current two-wire/three-wire, HART protocol）, etc.
Temperature Range	-30℃~160-350℃, Customized up to -300~850℃
Temperature Effects	0.00015%FS/℃
Pressure Connection	G1/2 female or user specified
Electrical Connection	Waterproof Connector(M20*1.5)
Protection Class	IP65

Silicon Pressure Sensor Applications

Silicon Pressure Sensor Mainly used to measure the pressure of gas, liquid and other objects. The parameters are then converted into standard telecom signals.

The application scope of diffusion silicon pressure transmitter mainly has the following:

Petroleum/Petrochemical/Chemical
Matched with the throttling device, it provides accurate flow measurement and control.
Measures pressure and level in pipes and tanks.
Electricity/city gas/other company business
Places such as measurement require high stability and high precision.
Pulp and paper
It is used in places requiring chemical resistance, corrosion resistance, etc.
Steel/non-ferrous metals/ceramics
It is used for furnace pressure measurement and other places requiring high stability and high precision measurement.
For use where stable measurements are required under strictly controlled (temperature, humidity, etc.) conditions.
Machinery/Shipbuilding
It is used in places where stable measurement is required under high-precision conditions such as strict control of temperature and humidity.

Extended reading: Featured Diaphragm Seal Pressure Transmitters

There are many types of pressure sensors. Such as resistance strain gauge pressure sensor. Semiconductor strain gauge pressure sensor. Piezoresistive pressure sensor. Inductive pressure sensor. Capacitive pressure sensor. Resonant pressure sensor, etc.

At present, the widely used pressure sensors include: diffused silicon piezoresistive pressure sensors, ceramic piezoresistive pressure sensors, sputtering film pressure sensors, capacitive pressure sensors, and sapphire pressure sensors with high temperature resistance.

But the most widely used is the piezoresistive pressure sensor, which has extremely low price, high precision and good linearity.

Extended reading: What is an air pressure transducer?

When the semiconductor silicon material is subjected to force, the atomic lattice changes.
That is, the spacing of the lattice changes. Then the carrier mobility of the silicon material changes.
changes, and the concentration changes. The lateral distribution structure and longitudinal distribution of carriers are disturbed.
The distribution structure of the material eventually leads to a change in the resistivity of the material. The above is half of the
A detailed elaboration of the piezoresistive effect of conductor silicon materials.

A pressure sensor that is also widely used, that is, a resistance strain sensor. Compared with a piezoresistive pressure sensor, the working process or working principle between the two is essentially different.

Piezoresistive Effect of Semiconductor Silicon Piezoresistive Pressure Sensor and Strain Effect of Metal Strain Gauge
The difference between the two should be: the output power of the former, that is, the change of the resistance value mainly depends on the material.
The change of the resistivity of the material. The output power of the latter, that is, the change of the resistance value depends on
Changes in material geometry (strain.

The sensitivity of semiconductor silicon material is high, and its sensitivity is 50 to 100 times that of metal strain gauges.

In 1954, Smith devoted himself to researching the piezoresistive effect of semiconductor silicon material. At the same time, he used it to make pressure sensors.

The silicon pressure sensor researched in the early stage is similar to the semiconductor strain gauge. After development and research, the N-type silicon wafer is doped with P-type impurities by diffusion or ion implantation. The resistance bar is customized. It is matched behind the resistance bar Connect a suitable bridge circuit to make an integrated chip.

It is the same as the use of resistance strain gauges. The chip cannot be used independently to complete the measurement work. It also needs to be firmly attached to the elastic element to sense the change in the measured pressure.

Diffused silicon piezoresistive pressure sensor refers to a sensor made by using the above-mentioned chip as a sensitive element.

The piezoresistive chip of the piezoresistive pressure sensor is packaged in a shell, and the periphery is fixed to form a silicon cup structure.

On the circular silicon diaphragm, four resistance strips with equal resistance value are made by the above-mentioned diffusion or ion implantation doping method.

Put two of them in the range of compressive stress. The other two are fixed in the range of tensile stress. Together they form a Wheatstone bridge measurement circuit.

Resistor strips are drawn from the bridge power supply terminal and output terminal.

The above-mentioned structure is packaged by the manufacturing method of an integrated circuit to obtain a diffused silicon piezoresistive pressure sensor.

Capacitive pressure sensor is a pressure sensor that uses capacitive sensitive elements to convert the measured pressure into an electrical output that has a certain relationship with it. The characteristics are that the input energy is low, the dynamic response is high, the natural effect is small, and the environmental adaptability is good.

It generally uses a circular metal film z or a metal-plated film as an electrode of the capacitor. When the film is deformed by pressure, the capacitance formed between the film and the fixed electrode changes. The output can be in a certain relationship with the voltage by measuring the circuit. electrical signal.

Capacitive pressure sensors belong to the polar distance variable capacitive sensors. They can be divided into single capacitive pressure sensors and differential capacitive pressure sensors

Current MEMS pressure sensors include silicon piezoresistive pressure sensors and silicon capacitive pressure sensors. Both are microelectromechanical sensors produced on silicon wafers.

The silicon piezoresistive pressure sensor uses high-precision semiconductor resistance strain gauges to form a Wheatstone bridge as a force-electricity conversion measurement circuit. It has high measurement accuracy, low power consumption and extremely low cost. Piezoresistive sensor for a Wheatstone bridge. If there is no pressure change, its output is zero and almost no power consumption.

Capacitive pressure sensors use MEMS technology to create a grid-like shape on a silicon wafer. The upper and lower two transverse barriers become a group of capacitive pressure sensors. The upper transverse grille is displaced downward by pressure. Changed the spacing between the upper and lower transverse grids. It also changes the size of the capacitance between the plates, that is, △ pressure = △ capacitance.

Extended reading: Industrial Pressure Transmitters|Buy from the manufacturer

SMT3151 TGP Gauge Pressure Transmitter/Transducer

Posted on May 23, 2019 by KimGuo11

What is a gauge pressure transmitter?

Gauge Pressure Transmitter/Transducer is a commonly used pressure measurement process instrument in industry. The gauge pressure transmitter measures the pressure signal at the reference end of atmospheric pressure.

An industrial gauge pressure transmitter is commonly used to monitor the process pressure of liquid, gas, steam, etc.

Sino-Inst offers a variety of Gauge pressure transmitters for industrial pressure measurement. If you have any questions, please contact our sales engineers.

More Pressure Transmitters

Benefits of Gauge Pressure Transmitter

High accuracy: The pressure transmitter can perform high-accuracy measurements within the measurement range of 0~60MPa.
Excellent overpressure performance: Can withstand 2 times the pressure range.
Intelligent static pressure compensation and temperature compensation protect the transmitter from the influence of temperature, static pressure and overpressure, reducing errors.
LCD digital display with backlight
Built-in three-button quick operation and local adjustment function
Various anti-corrosion materials are available
Multi-faceted self-diagnosis function
Optional signals 0-10V, 4-20mA, RS485, HART protocol, etc.

Read more about: Common Units Of Pressure

Specifications of Gauge Pressure Transmitter

Use object:	Liquid, gas or steam
Measuring range	0-3.5～35kPa 0-10～100kPa 0-35～350kPa 0-0.1～1.0MPa 0-0.35～3.5MPa 0-1.0～10MPa 0-2.1～21MPa 0- 4.1～41Mpa 0- 6.0～60MPa
Output signal:	4-20mAdc. Output, superimposed HART protocol digital signal (two-wire system)
Power source:	External power supply 24V dc. Power supply range 12V ~ 45V
Installation in dangerous places	Flameproof ExdIIBT5Gb; (explosion-proof certificate no. :CE16.1163) Intrinsically safe ExiaIICT4/T5/T6Ga; （explosion-proof certificate no. : CE15.2354X）
Accuracy:	±0.1%, ±0.075%
Stability:	±0.2%/12 months of the maximum range
Temperature effect：	Including zero and range for maximum temperature error of ±0.2% / 20 ℃
Power supply impact:	Less than 0.005% / V of the output range.
Vibration effect:	In any axial direction, the frequency is 200Hz, and the error is ±0.05% / g of the maximum range.
Electronic circuit board work in:	– 40 ~ 85 ℃;
Sensitive components work in :	– 40 ~ 85 ℃;
Storage temperature :	– 40 ~ 85 ℃;
With digital display:	– 25 ~ 75 ℃ (run); – 40 ~ 85 ℃ (no damage);
Relative humidity:	0 ~ 95%
Overpressure limit:	2~5 times the maximum range of the pressure transmitter is not damaged.
Volume change:	Less than 0.16cm3
Damping:	The time constant is adjustable from 0.1 to 32.0s.
Startup time:	3s, no preheating required.

**Flush membrane pressure connection interface**

Extended reading: How to calibrate HART pressure transmitters

Common Industrial Applications of Gauge Pressure Transmitter

Gauge pressure transmitter is the most commonly used detection instrument in industrial process control, which is widely used in various automatic control systems. Such as aerospace, military industry, petrochemical, chemical industry, oil well, electricity, shipbuilding, building materials, pipelines and many other industries.

It is generally used to measure pressure or absolute pressure in environments where the medium temperature is not too high, the corrosiveness is not strong, the viscosity is not high, and it is not easy to crystallize.

If low temperature, high temperature, corrosive medium measurement is required. Please contact our engineers for customization!

Mechanical and plant engineering
Chemical industry
Medical technology
Food and beverage
Oil and gas industry
Packaging and paper industry
Pharmaceutical industry

Explosion Proof Pressure Transmitter for Hazardous locations

Gauge pressure transmitter working principle

SMT3151 TGP-Gauge Pressure Transmitter / Transducer is a diffusion silicon pressure transmitter. The working principle of the diffused silicon pressure sensor is based on the piezoresistive effect.

Using the principle of piezoresistive effect, the pressure of the measured medium directly acts on the diaphragm of the sensor (stainless steel or ceramic).

Make the diaphragm produce a slight displacement proportional to the pressure of the medium. To change the resistance value of the sensor. Use electronic circuits to detect this change. And convert and output a standard measurement signal corresponding to this pressure.

More about : Pressure transmitter Working Principle.

Difference between absolute, gauge, and differential pressure

Comparison of absolute, gauge and differential pressure

Absolute pressure

Absolute pressure is referred to as the vacuum of free space (zero pressure). In practice, absolute piezoresistive pressure sensors, measure the pressure relative to a high vacuum reference, sealed behind its sensing diaphragm.

The vacuum has to be negligible compared to the pressure to be measured. Sino-Instrument’s absolute pressure sensors, offer ranges from 1 bar or even 700 mbar as well as barometric pressure ranges.

Gauge pressure

Gauge pressure is measured relative to the ambient atmospheric. The average atmospheric at sea level is 1013.25 mbar. Changes of the atmospheric, due to weather conditions, or altitude influences the output of a gauge pressure sensor.

A gauge pressure higher than ambient pressure is referred to as positive pressure. If the measured pressure is below atmospheric, it is called negative or vacuum gauge pressure. In general, a vacuum is a volume of space that is essentially empty of matter.

According to its quality vacuum is divided into different ranges such as an e.g. low, high and ultra high vacuum.

Differential pressure

Differential pressure is the difference between any two process pressures p1 and p2. Differential pressure sensors must offer two separate pressure ports, with a tube or thread. Sino-Instrument’s amplified pressure sensors, are able to measure positive and negative pressure differences. i.e. p1>p2 and p1<p2.

These sensors are called bidirectional differential pressure sensors, with ranges of e.g. -1…+1.0 bar or -2.5…+2.5 mbar. In contrast, unidirectional differential pressure sensor only operate in the positive range (p1>p2). E.g. from 0…1.0 bar or 0…2.5 mbar. And the higher has to be applied to the pressure port defined as “high pressure”.

Gauge Pressure VS Absolute Pressure

Gauge pressure refers to pipeline pressure. It refers to the pressure measured with pressure gauges, vacuum gauges, U-shaped tubes and other instruments, also called relative pressure). “Gauge pressure” starts from atmospheric pressure.
The pressure directly acting on the surface of the container or object is called “absolute pressure”. The absolute pressure value starts with absolute vacuum.
Absolute pressure actually refers to the gauge pressure plus the local atmospheric pressure (generally a standard atmospheric pressure can be 101.3Kpa).

Absolute pressure = gauge pressure + one atmosphere
If the unit is MPa, absolute pressure = gauge pressure + 0.1MPa

Transmitters can convert physical signals into electrical signals.
For example, our pressure transmitter can convert pressure signals into 4-20mA. Liquid level transmitter can convert liquid level signals into 4-20mA.

Gauges are generally mechanical. There is no output of electrical signals. For example, pressure gauges and liquid level gauges. The measurement results can be measured and read intuitively.

When selecting a pressure transmitter, the concept of pressure type is involved: absolute pressure, gauge pressure, negative pressure and differential pressure.

Absolute pressure transmitter measures the absolute pressure of the medium in the equipment. Its reference pressure is an absolute value of 0. It has nothing to do with atmospheric pressure. Therefore, there will be a vacuum sealed cavity on the low-pressure side of the pressure core.

Gauge pressure transmitter measures the pressure based on atmospheric pressure. One side of the pressure transmitter is connected to the atmosphere, and the other side is connected to the measured pressure, so the reference pressure side is open to the atmosphere. It is generally used to measure the liquid level of pipelines and non-pressure tanks.

If you pay close attention to the outer shell of some gauge pressure transmitters, it is not difficult to find some small holes on it. These vents are reserved to keep the reference side connected to the atmosphere.

More Featured Pressure Transmitters and Pressure Measurement Solutions

We at Sino-Inst manufacture and supply various types of gauge pressure transmitters for various industries. Customized production is available based on your measurement requirements, including pressure range, temperature, accuracy, signal output, mounting thread, material, etc.

If you need to purchase a gauge pressure transmitter, or have any technical questions, please feel free to contact us.

Request a Quote

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KimGuo11

drurylandetheatre.com

Diaphragm Seal Pressure Level Transmitter

Posted on April 2, 2019 by KimGuo11

SMT3151TLT Pressure Level Transmitter is an economical flange direct-mounted pressure transmitter. An isolation diaphragm box is added as the measuring liquid contact part. One port is connected to the process tank (or pipeline) by flange (or other connection method).
Mainly used to measure high-temperature, easy to solidify or crystallize, containing suspended solids, too viscous, corrosive or other media that need to maintain sanitary conditions and cannot be contaminated.

Get a Quote

Sino-Inst offers a variety of Diaphragm Seal Pressure Transmitters for industrial pressure measurement. If you have any questions, please contact our sales engineers.

Features
Specifications
Applications

Features of Pressure Level Transmitter

Diffusion silicon isolation sensor
Flange installation
Large size diaphragm, fully welded and sealed, long-term reliable and durable
Aluminum alloy junction box with strong seal and good outdoor installation
Used for pressure measurement of gas, liquid and steam
Anti-corrosion metal diaphragm optional
With LCD display optional
Especially suitable for high temperature or viscous liquid
The flange size is customized according to customer requirements. And the installation is flexible and diverse

Specifications of Pressure Level Transmitter

Model	Transmitter type
SMT-3151TLT	Flange level transmitter
Code	Scale range
2 3 4 5	0-20～100kPa(0-2000～10000mmH₂O) 0-70～350kPa(0-7～35mH₂O) 0-200～1000kPa(0-20～100mH₂O) 0-700～3500kPa(0-70～350mH₂O)
Code	Output form
E	Linear output 4-20mAdc
SF	Linear output 4-20mAdc+HART signal，Full function buttons on site
F	MODBUS-485 signal
Code	Flange standard (high pressure side flange)
A	ANSI American Standard (HG20615)
D	DIN European standard（HG20592）
Code	Process connection size
ANSI American Standard (HG20615)	DIN European standard（HG20592）
25	1″	DN25
40	1.5″	DN40
50	2″	DN50
80	3″	DN80
00	4″	DN100
Code	Process connection withstand voltage rating
ANSI American Standard (HG20615)	DIN European standard（HG20592）
A	150LB	PN16/25
B	300LB	PN40
C	600LB	PN64
D	900LB	PN100
Code	Measuring diaphragm
A	316 Stainless steel
B	Hastelloy C
C	Monel
D	Tantalum
E	Titanium
F	Special requirements
Code	Insert barrel length	Insert barrel material
A	0 mm	None
B	50 mm	316L Stainless steel
C	150 mm	316L Stainless steel
D	200 mm	316L Stainless steel
Code	Filling liquid
D	Ordinary silicone oil （-40~104℃）
F	High temperature silicone oil （-40~304℃）
S	Inert liquid （-40~204℃）
Code	Shell material	Conduit inlet dimensions
A	Low copper aluminum alloy polyurethane coating	M20×1.5
B	Low copper aluminum alloy polyurethane coating	1/2-14 NPT
C	Stainless steel	M20×1.5
D	Stainless steel	1/2-14 NPT
Code	Optional parts
M1	0～100% Linear indicator
M4	LCD Multi-function digital display
Da	Flameproof ExdIIBT5Gb;(explosion-proof certificate No. : CE16.1163)
Fa	Intrinsically safe ExiaIICT4 / T5 / T6Ga;(explosion-proof certificate No. : CE15.2354X)
CX	With corresponding 316 flushing ring

Applications for Pressure Level Transmitters

The application which is suitable for diaphragm seal system… For measuring the liquid level, density, flow, and pressure of :

High/low temperature fluids
Highly corrosive/high viscosity fluids
The fluids which may cause clogging of impulse piping in the low temperature
Toxic fluids
The fluids containing suspended solids which are deposited in the impulse piping and may cause clogging.\

Extended reading: Featured Diaphragm Seal Pressure Transmitters

Diaphragm flange material selection

The biggest advantage of the Diaphragm Seal Pressure Level Transmitter is that different diaphragm materials can be selected. According to different corrosion, media to achieve the best corrosion resistance. The commonly used diaphragm materials are SUS316L stainless steel. Tantalum, Hastelloy, Monel, Pure titanium, F4, etc.

When choosing a diaphragm pressure transmitter, in addition to the correct choice of structure and range, the more important thing is to choose the material. The so-called reasonable is to consider its corrosion resistance, but also to consider the economy. For example, the corrosion resistance of the tantalum diaphragm and Hastelloy is excellent, but it is expensive. Only used in environments with high corrosivity and other cheap materials are not suitable.

The following table introduces several common corrosion-resistant materials that can be selected for corrosion media. For your reference.

Corrosive medium	Tin bronze (QSn6.5-0.4)	SUS316	Pure tantalum (Ta)	Monel (Ni70Cu30)	Hastelloy (HC)	Polytetrafluoroethylene (F4)
Sulfuric acid (H2SO4)	V	△	○	V	V	V
Nitric acid (HNO3)	╳	V	○	╳	V	V
Hydrochloric acid (HCI)	△	╳	○	╳	V	V
Phosphoric acid (H3PO4)	V	V	○	V	V	V
Acetic acid (CH3COOH)	V	V	○	V	○	V
Caustic soda (NaOH)	△	○	△	○	○	V
Soda ash (Na2CO3)	○	○	○	○	V	V
Baking soda (NaHCO3)	V	○	○	○	○	V
Chlorine (CI)	Dry: V	Dry: V	○	Dry: V	V	V
	Wet: ╳	Wet: ╳	Wet: ╳
Bromine (Br2)	Dry: △	Dry: ╳	○	Dry: ○	○	V
	Wet: ╳	Wet: △	Wet: ╳
Ammonia (NH3)	╳	V	╳	╳	○	V
Seawater (30% NaCI)	V	V	○	○	○	V

Explanation of symbols: ○ ——best; △ ——conditional use; V——can be used;

Extended reading: Common Pressure Sensor Applications

What is diaphragm seal pressure transmitter?

The diaphragm seal pressure transmitter is the flange type pressure transmitter. This type of pressure transmitter, assembling diaphragm seals to field transmitters for the purpose of measuring pressure, differential pressure, level, and flow.

What is a diaphragm seal?

Diaphragm Seals, also known as Chemical Seals or Gauge Isolators, are used to isolate pressure instrumentation, like pressure gauges, pressure transmitters, pressure switches, level transmitters, and more from process media that is hot, corrosive, clogging, or otherwise damaging to the pressure instrument.

A diaphragm seal has two primary tasks:

Separation of the measuring instrument from the process medium
Transfer of the pressure to the measuring instrument

What is remote seal?

Extended reading: SI-703 Flush Diaphragm Pressure Sensor

FAQ

A pressure level transmitter is a device that works on the principle that static pressure is proportional to liquid level height. It is essentially a device that combines the functions of a pressure sensor and a level gauge.

The transmitter uses an advanced isolated diffused silicon sensitive element or a ceramic capacitor pressure sensitive sensor. The measured static pressure of the liquid is converted into an electrical signal.

This process is temperature compensated and linearly corrected, and the final output is a standard electrical signal, common forms are 4~20mA or 1~5VDC, etc.

Extended reading: Flat Pressure Sensor for High Viscosity Fluids

The pressure gauge is an instrument that uses elastic elements as sensitive elements to measure and indicate pressure higher than the ambient pressure. It is used in almost all industrial processes and scientific research fields.

Pressure transmitter is a device that converts pressure into pneumatic or electric signals for control and remote transmission.

The differences between pressure transmitter and pressure gauge are:

The accuracy of the standard instrument required for pressure transmitter calibration is much higher than the accuracy of the standard instrument required for pressure gauge.
The pressure gauge only needs to calibrate a pair of input and output relationships. The pressure transmitter may need to calibrate the relationship between input and communication data.
Pressure gauge calibration must have corresponding metrological qualifications. Pressure transmitters are generally not required except for production and new construction.
The pressure gauge has poor accuracy and no output. It cannot be operated with a hand operator. Generally, 5 points are calibrated. The back and forth difference is different. The intelligent pressure transmitter generally only needs to calibrate the zero point and full scale.
The output of the pressure gauge is a scale indication, and its own display capability. The pressure transmitter is a current output and must be connected to an ammeter display of the corresponding accuracy level.

Extended reading: extrusion melt pressure transducer

A diaphragm seal system consists of a pressure instrument, a fill liquid, and a diaphragm seal, either direct-mount or capillary.

Diaphragm seals are used to seal and protect instruments from process media. The flexibility of the seal lies in the fact that the diaphragm securely seals the contents and penetrates the instrument to accurately measure pressure.

Diaphragm seals are often used in conjunction with pressure transmitters. This combination can be used in extremely harsh environmental conditions.

The fact that they can isolate instruments from any kind of toxic and reactive chemicals makes them particularly useful devices.

Diaphragm-sealed pressure transmitters are used when the medium is corrosive or will corrode the internal parts of the transmitter (for example, ammonia will corrode the copper in the transmitter).

Extended reading: High accuracy pressure transducers

Sino-Inst is a Pressure Level Transmitters manufacturer in China.

We offer all types of Pressure Level Transmitters. Like Direct Mounted, flange-mounted, single flange, double flange, Remote Diaphragm Seals, High Static, Digital Remote.

Most of our Pressure Level Transmitters are used in oil, liquids, DP transmitter, flow measurement, level measurement (like the ultrasonic level measurement), density, and other process variables.

You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification. We will share more about instrument calibration, like the flow transmitter calibration.

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