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:

Diaphragm Seal Pressure Transmitter － Flush Flanged

Posted on January 28, 2026 by KimGuo11

Diaphragm Seal Pressure Transmitter flush flanged

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?

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.

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.

Request a Quote

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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

Flange Mounted Differential Pressure Transmitter

Posted on January 26, 2026 by KimGuo11

The Flange Mounted Differential Pressure Transmitter is based on an intelligent differential pressure transmitter and features a flush-mounted or extended flange. It is suitable for measuring the level, differential pressure, and density of liquids that are prone to crystallization or sedimentation. Equivalent to model EJA210E.

Can be directly installed on tanks or pipelines. It is used for measuring high-temperature, easily solidifying or crystallizing, suspended solids-containing, highly viscous, highly corrosive, or other media that require hygienic conditions and cannot be contaminated.

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

More DP Transmitters

Sino-Inst Flange Mounted Differential Pressure Transmitter uses advanced microprocessing technology and digital communication technology. It outputs a 4~20 mA DC signal corresponding to the measured differential pressure. It can also be configured with the HART protocol.

Flange Mounted Differential Pressure Transmitter Features:

Used to measure the differential pressure of corrosive and non-corrosive gases, steam and liquids;
Using a stainless steel diaphragm;
Applicable to various hazardous places;
Output linear DC current proportional to the differential pressure value;
Provide various isolation diaphragms to meet special applications, such as liquid level measurement, corrosive media;
High measurement accuracy, 0.1%FS, 0.5%FS;
Extensible measurement range;
Aluminum and stainless steel housing;
With intrinsically safe explosion-proof and isolated explosion-proof capabilities. Can be used in various hazardous places.

Extended reading: Smart Differential Pressure Transmitter

Specification of Flange Mounted Differential Pressure Transmitter

Model	Transmitter type
SMT3151LT	Flange Mounted Differential Pressure Transmitter
Code	Scale range
4	0-4.0～40kPa(0-400～4000mmH2O)
5	0-20～200kPa(0-2～20mH2O)
6	0-70～700kPa(0-7～70mH2O)
7	0-210～2100kPa(0-21～mH2O)
Code	Output form
E	Linear output 4-20mAdc
SF	Linear output 4-20mAdc +HART signal
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
0	4”	DN100
Code	Process connection pressure rating
ANSI American Standard (HG20615)	DIN European Standard (HG20592)
A	150LB	PN16/25
B	300LB	PN40
C	600LB	PN64
D	900LB	PN100
Code	High pressure side diaphragm
A	316 stainless steel
B	Hastelloy C
C	Monel
D	Tantalum
E	Titanium
F	Special Requirements
Code	High pressure side insert tube length	High pressure side insert cylinder material
A	0 mm	None
B	50 mm	316L Stainless steel
C	150 mm	316L Stainless steel
D	200 mm	316L Stainless steel
Code	High pressure side filling fluid
D	General silicone oil （-40~104℃）
F	High temperature silicone oil （-40~304℃）
S	Inert liquid （-40~204℃）
Low pressure side structural material	Flange (joint)	Exhaust/drain valve	Isolation diaphragm	Sensor filling fluid
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
S2	A remote transmission device (with a remote transmission device on the low-voltage side)
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 head
M4	LCD multi – power digital display head
D1	Side discharge valve at the top (only for the low pressure side of the low pressure side without remote transmission)
D2	Side discharge valve at the top (only for the low pressure side of the low pressure side without remote transmission)
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

Extended Reading:

Applications

The Flange Mounted Differential Pressure Transmitter can accurately measure the liquid level and density of various containers. There are two types of flat flange and insert flange. It is suitable for high-viscosity medium or suspended liquid measurement.

Viscous medium at high temperature;
Easily crystallized medium;
Precipitation medium with solid particles or suspended matter;
Strongly corrosive or highly toxic medium;
It can eliminate the leakage of the pressure guiding pipe and pollute the surrounding environment. It can avoid the instability of the measurement signal when the isolation liquid is used. The tedious work of frequently supplementing the isolation liquid is required;
Continuously and accurately measure the interface and density;
The remote transmission device can avoid the mixing of different instantaneous media so that the measurement results truly reflect the actual situation of process changes;
Places with high sanitation requirements;
Such as in the production of food, beverage, and pharmaceutical industries. Not only the transmitter contacting the media parts meet hygienic standards, but also should be easy to wash. To prevent cross-contamination of different batches of media.

Pressure level transmitter is good for level measurement. Most of the time, we use submersible hydrostatic level sensor for the level measurement. When you can not use the probe of hydrostatic level sensor, you can try with this pressure level transmitter. Pressure level transmitter, is one type of DP level measure instrument, with the diaphragm.

More

The SMT3151LT differential pressure level transmitter is a new type of differential pressure transmitter manufactured using advanced technology and equipment. Equipped with dual remote seals, it can be used for continuous measurement of liquid level, flow rate, and differential pressure. It offers particular advantages in applications involving sealed storage tanks.

More

Flange Mounted Differential Pressure Transmitter Working principle

1. Headcover; 2. Head; 3. Metal bulkhead; 4. Shell; 5. Nameplate label; 6. Explosion-proof joint; 7. Terminal block; 8. Head cover; 9. Drain valve; 10. Bolt; 11. Clamp; 12. Sensor seal; 13. Sensor; 14. Nut; 15. Welded pipe joint assembly

Differential pressure transmitters utilize the pressure difference generated by the liquid’s own gravity to measure the liquid level in a container.

Flange-mounted differential pressure transmitters are directly installed on pre-existing flanges at the bottom of pipes or containers, contacting the liquid through an isolation diaphragm.

When the diaphragm is subjected to pressure, it undergoes slight deformation. The displacement of the diaphragm changes with the differential pressure. This change is precisely converted by an amplification circuit into a 4-20mA DC two-wire current, voltage, or digital HART output signal, thus achieving pressure measurement and transmission.

The high-pressure side measuring tube is always filled with the medium, maintaining constant pressure. The low-pressure side measuring tube forms a communicating vessel with the container, and its pressure changes linearly with the liquid level in the container.

Let △P be the differential pressure signal received by the transmitter, P0 be the internal pressure of the container, P+ be the pressure on the positive pressure side of the transmitter, and P- be the pressure on the negative pressure side of the transmitter. Let ρ be the density of the liquid in the container, g be the acceleration due to gravity, h1 be the height from the process zero point to the upper pressure tap of the container, h2 be the process liquid level in the container, and h be the height from the transmitter to the process liquid level zero point.

Then:
P+ = P0 + ρgh1 + ρgh
P- = P0 + ρgh2 + ρgh
△P = P+ – P- = ρgh1 – ρgh2

When the liquid level changes from h2=0 to h2=h1, the differential pressure measured by the transmitter changes from its maximum value to △P=0. By configuring the transmitter, the output current changes from 4mA to 20mA.

Single flange vs Double flanges differential pressure level transmitter

In principle: all are differential pressure transmitters + flange guide pressure;
In terms of structure: the single flange liquid zd position transmitter has only one flange diaphragm box connected to the high pressure side, and the low pressure side to the atmosphere. The double flange liquid level transmitter is high and low pressure side through oil-filled capillary It is connected with two flanged membrane return boxes. There is also a capillary. The single flange transmitter is installed below, and a capillary is drawn from the low pressure side of the single flange transmitter to the upper flange membrane box.
In terms of engineering applications: all can only measure the liquid level of fixed density. The single-flange transmitter can only be used for the liquid level of atmospheric equipment that can be imagined with the atmosphere. The double-flange transmitter can be suitable. Answer: Use closed equipment kettle to measure liquid level;
From the economical point of view, the double flange is definitely more expensive than the single flange. After all, there is one more flange capsule and capillary.

**Piezoresistive Differential Pressure Transmitter**
Piezoresistive Differential Pressure Transmitter utilizes the piezoresistive effect of semiconductor silicon materials. Realize accurate measurement of differential pressure.

**Smart Differential Pressure Transmitter**
Smart Differential Pressure Transmitter measures industrial differential pressure. Can Works with diaphragm seals, capillary, HART. Outputs standard signals (such as 4 ~ 20mA, 0 ~ 5V).

**Diaphragm Seal Pressure Transmitter**
When the process medium should not come into contact with the pressured parts of the measuring instrument. Diaphragm sealed pressure transmitters are used for pressure measurement.

**High-Temperature Pressure Transmitter**
High-temperature pressure transmitters with a 4-20mA output.
which has a temperature capability of over 850 °C and is not pyroelectric.

SMT3151DP Smart Differential Pressure Transmitter

Posted on January 26, 2026 by KimGuo11

The SMT3151DP Smart Differential Pressure Transmitter utilizes a single-crystal silicon sensor with German MEMS technology, offering higher measurement accuracy. It outputs standard signals (e.g., 4-20mA, 0-5V) and can also be configured with RS485 Modbus RTU or HART protocols.

The single-crystal silicon sensor core features a dual-beam suspension design, significantly improving accuracy and resistance to unilateral and bilateral overload. A built-in intelligent signal processing module achieves perfect integration of static pressure and temperature compensation. This enhances measurement accuracy and long-term stability across a wide range of static pressure and temperature variations.

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

More DP Transmitters

Features
Specifications
Datasheet
Order Guide

Features

Blue and white custom housing smart differential pressure transmitter

Output signal 4-20mA output+RS485/HART communication;
0.075%FS high accuracy, millisecond-level ultra-fast response;
Built-in three-button quick operation for on-site adjustment;
Self-diagnosis capability;
Range coverage is 0-0.1KPa~41.0MPa;
Good stability, high precision, adjustable damping, strong resistance to one-way overload.
Explosion-proof housing structure.
LCD display;
IP67 protection rating;
Intelligent static pressure compensation and temperature compensation protect the transmitter from the effects of temperature, static pressure, and overpressure, controlling the overall measurement error at the site within the specified parameters;
High static pressure resistance, up to 40MPa;

Extended reading: How to calibrate HART pressure transmitters

Technical Specifications

Measurement Range	1KPa, 4KPa, 40KPa, 100KPa, 400KPa, 4MPa, 40MPa
Single-Side Overpressure	16MPa
Dual-Side Static Pressure	16MPa 25MPa 40MPa
Measurement Accuracy	±0.075%, ±0.1%, ±0.5% (including linearity, hysteresis, and repeatability from zero)
Measured Medium	Gas, Liquid, Steam
Output Signal	4~20mA DC+RS485/HART protocol
Power Supply	General 10.5~45VDC, intrinsically safe explosion-proof 10.5-26VDC
Power Line Spacing	15cm and above (avoid parallel wiring)
Saturation Current	Upper limit 20.8mA, lower limit 3.8mA
Alarm Current	Upper limit 22.8mA, lower limit 3.6mA (mode adjustable)
Adjustment Function	Zero and full-scale points can be adjusted locally via the three buttons on the top of the casing or remotely via configuration software
Zero Shift	Can be shifted within the range of -20% to +20% of the maximum range
Output Method	Linear output Square root output (can be remotely adjusted via configuration software)
Operating Temperature	-40~85℃
Measured Medium Temperature:	-40℃~120℃ (High temperature customizable)
Diaphragm Material	316L stainless steel/Hastelloy alloy/Tantalum diaphragm/Gold-plated diaphragm
Position Effect	Approximately 200Pa between horizontal and vertical positions
Response Time	10ms
Static Pressure Effect	< 0.05%FS/10MPa
Overpressure Effect	< 0.05%FS/10MPa
Stability	≤0.03%FS/year
Power Supply Effect	< 0.005%FS/V
Explosion-Proof Rating:	Exd Ⅱ CT6 Gb, Exia Ⅱ CT6 Ga
Enclosure Protection Rating:	IP67

SMART Differential Pressure Transmitter Datasheet

SM3151DP-Differential-Pressure-Transmitter Download

Order Guide

Use object: liquid, gas, or steam

Model	Transmitter type
DP	Pressure transmitter
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

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)

Working principle of SMART differential pressure transmitter

The intelligent differential pressure transmitter uses a single-crystal silicon piezoresistive sensor as its core component. When pressure is applied to the sensor, the resistance of the single-crystal silicon changes, which is converted into an electrical signal by the circuit, and then digitally processed to output a standard signal (such as 4-20mA or a digital signal).

Its intelligent feature lies in its built-in microprocessor, which can perform temperature compensation, linear correction, and fault diagnosis, ensuring high measurement accuracy and stability.

The SMT3151DP intelligent differential pressure transmitter integrates differential pressure measurement, display, and signal output functions. This intelligent differential pressure transmitter is used to measure the level, density, flow rate, and pressure of liquids, gases, or vapors.

Smart Differential Pressure Transmitter Applications

SMT3151DP smart differential pressure transmitter is suitable for applications like:

Flow measurement;
- The differential pressure transmitter is combined with the throttling device (like the orifice plate). To convert the flow rate according to the differential pressure value, generated before and after the throttling device.
Level monitoring;
- Measuring the height of the liquid by the pressure difference, generated by the gravity of the liquid itself.
Steam measurement;
Filter or pump differential pressure;
For Monitoring Hydronic HVAC Systems.
Critical process monitoring.

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Generally used in liquid, gas or steam differential pressure, flow measurement. The medium temperature is not too high, corrosion is not strong, viscosity is not high, not easy to crystallize and other environments.

If the working static pressure exceeds 16MPa, a high static differential pressure transmitter should be selected.

FAQ

Help Center

Smart transmitters work on the function of microprocessors for signal transmission.

Smart pressure transmitter consists of two parts: smart sensor and smart electronic board.

The intelligent sensor part includes: capacitive sensor, measuring diaphragm detection circuit, temperature sensor and temperature compensation circuit.

The part of the intelligent electronic board includes: a microcomputer controller and peripheral circuits. It completes the conversion of the pressure signal to 4-20mA dc.

Extended Reading: Digital Pressure Sensor-RS485

Depending on the type of pressure to be measured:

Pressure transmitter types include gauge pressure, absolute pressure, and differential pressure. Gauge pressure refers to the pressure that is less than or greater than atmospheric pressure based on the atmosphere. Absolute pressure refers to the absolute zero pressure as the reference and is higher than the absolute pressure. Differential pressure refers to the difference between two pressures.

According to the working principle of the pressure transmitter:

Strain Gauge Pressure Transducers
Capacitance Pressure Transducers
Potentiometric Pressure Transducers
Resonant Wire Pressure Transducers

Extended reading: Silicon Pressure Sensor

Simply put, a differential pressure transmitter is a device that measures two opposing pressures in a pipe or vessel. Differential Pressure (DP) transmitters measure the difference between two pressures. They use a reference point called the low-side pressure and compare it to the high-side pressure. Ports in the instrument are marked high-side and low-side. The DP reading can be either negative or positive depending on whether the low-side or high-side is the larger value. A DP transmitter can be used as a gauge pressure transmitter if the low-side is left open to the atmosphere.

Extended reading: Featured Diaphragm Seal Pressure Transmitters

The most common and useful industrial pressure measuring instrument is the differential pressure transmitter. This equipment will sense the difference in pressure between two ports and produce an output signal with reference to a calibrated pressure range.

The differential pressure transmitter can be used in combination with other accessories and can be used to measure liquid level and flow.

Differential pressure transmitters and pressure transmitters have many similarities. It can be mixed and used most of the time. As long as it is within the range of the differential pressure transmitter, it can measure not only positive pressure but also negative pressure. When measuring positive pressure, the negative port is open to atmosphere, and when measuring negative pressure, the positive port is open to atmosphere.

Differential pressure transmitters can also measure flow, pipeline pressure difference, tank liquid level, bubble water level, dust, or medium that is easy to crystallize and viscous and fluidity is not good.

DP Level Transmitter for Tank Level Measurement

Posted on January 16, 2026 by KimGuo11

The DP level transmitter works on the principle that the hydrostatic pressure difference of a liquid is directly proportional to the liquid level height. It calculates the liquid level by measuring the pressure difference of the medium inside the container and outputs a standard electrical signal. The dual-flange capillary structure provides mechanical and thermal isolation, allowing it to handle complex corrosive and high-temperature media in various industrial processes and tank level monitoring applications.

Sino-Inst offers a variety of DP Level Transmitters for industrial pressure measurement. Connection with diaphragm seals. If you have any questions, please contact our sales engineers.

More DP Transmitters

Features

Exd II CT6 Gb/ Exia II CT6 Ga, suitable for direct use in hazardous areas and outdoors;
All sensor components are made of 316L stainless steel;
316 stainless steel diaphragm, convenient installation with movable flange;
6 diaphragm materials available: 316L diaphragm, HC276 diaphragm, tantalum diaphragm, 316L fully coated diaphragm, gold-plated diaphragm, PTFE diaphragm, etc., customizable;
High-precision configuration, optional 0.1%FS, 0.075%FS;
Extremely high anti-interference and stability;
275-point temperature, pressure, and current compensation;
LED LCD display, 0-100% percentage display, and real-time liquid level value display;
Output: 4-20mA + HART/RS485;
Nitrogen pressurized base, superior sealing performance, nitrogen pressurization prevents leakage.

Specifications of DP level transmitter

Measuring Medium:	Gases, Vapors, Liquids
Measuring Range	-100kPa…0~6kPa…7MPa
Accuracy:	±0.075%, ±0.1%, ±0.2% (including linearity, hysteresis, and repeatability from zero point)
Stability:	±0.2%/year
Power Supply:	10–36V DC (24V DC recommended)
Reference Accuracy for Range Adjustment:	If TD > 10 (TD = Maximum range / Adjustable range), then: ±(0.075 × TD)%
Ambient Temperature:	-40℃ ~ 85℃
Measuring Medium Temperature:	-40℃ ~ 400℃ (higher/lower temperatures can be customized)
Storage Temperature:	-40℃ ~ 85℃
Display:	LCD, OLED
Display Module Temperature:	-20℃ ~ 70℃ (LCD), -40℃ ~ 80℃ (OLED)
Measuring Diaphragm:	316L, Hastelloy C, Tantalum, Titanium, Nickel, Monel, Duplex Stainless Steel, PFA, Gold Plating
Process Connection:	Stainless steel 316L, 304
Filling Fluid:	Silicone oil, fluorinated oil, etc.
Transmitter Housing:	Aluminum alloy material, epoxy resin coating on the surface
Housing Seal:	Nitrile rubber
Nameplate:	Stainless steel 304
Enclosure Protection Rating:	IP67
Explosion Protection Rating:	Exd Ⅱ CT6 Gb, Exia Ⅱ CT6 Ga
Measuring Range Limits	Within the upper and lower limits of the range, it can be set arbitrarily, as long as the calibrated range ≥ the set range. It is recommended to choose a range with the lowest possible range ratio to optimize performance.
Influence of Mounting Position	Changes in installation position will cause zero point influence, which can be corrected by zero adjustment; there is no range influence.
Output	Two-wire 4-20mA, compliant with NAMUR NE43 standard, superimposed digital signal (Hart protocol)
Output Signal Limits	Imin (minimum): 3.9mA Imax (maximum) = 21.0mA
Alarm Current	Low alarm mode (minimum): 3.9mA High alarm mode (maximum): 21mA (user pre-settable)
Default Alarm Current Setting	High alarm mode
Fault Warning	If the sensor or circuit fails, the automatic diagnostic function automatically outputs 22.0mA
Response Time	Amplifier component damping constant is 0.1s; sensor time constant is 0.1–1.6s, depending on the range and range ratio. Additional adjustable time constant: 0–100s
Warm-up Time	<15s

There are 5 types of remote transmission devices for remote differential pressure transmitters:

Flat type
Thread mounting type
Flange mounting type
Extended Diaphragm Seal
Wet legs/Dry legs

SM3151LT liquid level pressure-differential pressure transmitter Download

Applications of DP level transmitters

The differential pressure liquid level transmitter can prevent the measured medium from directly contacting the sensor diaphragm of the transmitter. It is suitable for the following situations:

When the measured medium has a corrosive effect on the transmitter connector and sensitive components;
When the high temperature measured medium needs to be isolated from the transmitter;
When there are solid suspended solids or high viscosity in the measured medium, it is easy to block the transmitter connector and the pressure chamber;
When the measured medium is easily cured or crystallized by the pressure tube;
When changing the measured medium needs to be rinsed and not to be mixed;
Hygienic conditions must be maintained to prevent pollution. .
Changing the measured medium requires strict purification of the measuring head
Suspended liquid or high viscosity medium
Measurement of sealed pressure vessel.

DP level transmitter working principle

The differential pressure level transmitter is an instrument that uses the pressure generated by the liquid column to measure the height of the liquid level. When the liquid level changes, the pressure received by the diaphragm at the high-pressure side flange will change accordingly. The differential pressure value calculated by the transmitter will also change accordingly. There is a linear relationship between them.

Normally, the high-pressure side (H side) and the low-pressure side (L side) cannot be installed reversely. Generally, the H side is installed at the lower part of the equipment, and the L side is installed at the higher part of the equipment. Before installation, the flange surface of the equipment should be cleaned and the gasket should not be placed off-center to prevent the diaphragm from being punctured or deformed, causing distortion of the transmitter.

SMT 3151 Differential Pressure Level Measurement

Differential pressure transmitter level measurement calculation

When using a Differential pressure (DP) level transmitter to measure the liquid level as shown in the figure below.

The measured liquid density in the figure is ρ.
The working medium density in the capillary of the double flange differential pressure transmitter is ρ0.
The measuring range of the measured liquid level is H.
The center distance of the sampling tube of the measured liquid level is h.

It can be seen from the figure that the maximum measurement range of the liquid level △ P = P + — P- = H × ρ × g – h × ρ0 × g.

It can be seen from the formula that the dual-flange differential pressure transmitter should perform negative migration. The migration amount S is h × ρ0 × g. And the installation position of the double flange differential pressure transmitter has no effect on the migration amount and the measurement result.

The dual-flange differential pressure transmitter requires negative migration.

When the measured liquid level is 0, the pressure difference between the positive and negative measurement chambers of the remote differential pressure transmitter is the largest. The output current of the double flange differential pressure transmitter is 4mA.

As the measured liquid level rises, the pressure difference between the positive and negative measurement chambers of the transmitter gradually decreases.

When the measured liquid level rises to the highest Hmax. The pressure difference between the positive and negative measurement chambers of the transmitter is the smallest. The output current of the double flange differential pressure transmitter is 20mA.

DP level transmitter calibration

The differential pressure liquid level transmitter has been calibrated in the range, accuracy, linearity and other parameters according to customer requirements at the factory. And mark the range, accuracy, etc. on the nameplate of the differential pressure liquid level transmitter. As long as the density and other parameters of the measured medium meet the requirements of the nameplate, generally no adjustment is required.

If the customer needs to adjust the range or zero position, please adjust according to the following methods. Assuming that the range of the differential pressure liquid level transmitter is 0 ~ 10 meters:

Unscrew the protective cover of the differential pressure liquid level transmitter. It can be adjusted by connecting an external standard 24VDC power supply and ammeter (requires accuracy of 0.2% or above).
When there is no liquid in the differential pressure liquid level transmitter. Adjust the zero potentiometers. Make it output a current of 4mA.
Pressurize the differential pressure liquid level transmitter to full scale (10 meters). Adjust the full-scale resistor. Make it output a current of 20mA.
Repeat the above steps two or three times until the signal is normal.
Please input 25%, 50%, and 75% signals to check the error of the differential pressure liquid level transmitter.
For non-aqueous media. Differential pressure level transmitters are calibrated with water. It should be converted according to the pressure generated by the actual density of the medium. For example, when the medium density is 1.3, the 1.3m water level should be used to calibrate the 1m range.
After adjustment, tighten the protective cover.
The verification cycle of the differential pressure liquid level transmitter is once a year.
HART intelligent differential pressure liquid level transmitter of Sino-Inst instrument can be selected. It is convenient to adjust the range of the differential pressure liquid level transmitter.

Extended reading: How to calibrate HART pressure transmitters

More Featured DP Transmitters

**Smart Differential Pressure Transmitter**

**Extended Diaphragm Seal DP Level Transmitter**

**Remote Seal Differential Pressure Transmitter**

Pressure Sensor | Designed for Shield boring machine-Earth compactor-Grouting machine

Posted on October 14, 2023 by KimGuo11

Shield boring machine Pressure Sensor The measuring end adopts a specially treated strong thick metal diaphragm. Adopting the principle of mechanical transmission, the hard sand and small rock particles in the measured medium sense the pressure through the isolation diaphragm without damaging the internal sensitive components. The pressure sensor has a compact structure, corrosion resistance, vibration resistance, hard sand impact resistance, and wide range temperature compensation. Suitable for pressure measurement of mud, wet soil and other media.

RFQ

Features of Shield boring machine Pressure Sensor

Using diaphragm isolation technology;
Integrated chip, wide voltage power supply;
High protection, compact structure and easy installation;
Cut-off frequency design, strong anti-interference ability, and lightning protection;
Current limiting, voltage limiting, reverse connection protection (current limiting output);
Resistant to vibration, frequent high-pressure impact, solid sand impact, and wear resistance;

Technical Parameters

Measuring medium:	Mud, wet soil, etc. (compatible with contact materials)
Pressure range:	0～0.6MPa (10, 16, 25, 40, 60, 100bar can be customized)
Pressure method:	Gauge
Accuracy level:	0.5%FS
Medium temperature:	-40～85℃
Connection time:	20ms
Stable performance:	±0.1% FS/year
Temperature compensation:	-10～70℃
Temperature drift:	±0.01%FS/℃ (within temperature compensation range) ±0.05%FS/℃ (outside temperature compensation range)
Protection level:	IP65
Durable performance:	1X10⁶ times (number of cycles from the lower limit of the measuring range to the upper limit of the measuring range)
Overall weight:	≈850g
Resolution:	Analog output 0.01%FS, digital output 0.05%FS
output signal:	4-20mA (two-wire system), 0-5/1-5/0-10VDC (three-wire system)
Supply voltage:	24VDC(10-30VDC)

Professional Applications

Specialized Pressure Transmitter for Heavy-Duty Machinery

When you’re dealing with machinery that faces rugged environments and intense pressure conditions, such as injection machines, tunnel boring machines (TBM), brick-making machines, and earth pressure machines, you need equipment that won’t buckle under the pressure – both literally and metaphorically. Enter our specialized pressure transmitter.

Injection Machines (Grouting Machines):

In the world of grouting machines or injection machines, consistency and precision are paramount. Given the intensity of the operations, the special thick metal diaphragm of our pressure transmitter stands out as an exemplary component. Not only does it efficiently sense the pressure of hard sand particles and small rock granules in the grout, but its unique mechanical transmission principle ensures that the sensitive internal elements remain undamaged. This guarantees precision and reduces maintenance downtimes.

Tunnel Boring Machines (Shield Machines or TBMs):

Tunnel construction is a challenging feat. With TBMs, where the machinery encounters diverse geological structures and varying pressure conditions, our pressure sensor plays a pivotal role. Its ability to withstand vibrations, corrosive environments, and the aggressive impact of hard sand granules ensures continuous, real-time pressure data. This translates to safer operations and optimal machine performance in various earth compositions.

Brick-making Machines:

Consistency is the hallmark of quality in brick-making. The compact structure and wide-ranging temperature compensation of our pressure transmitter ensure that it consistently delivers accurate pressure measurements. This aids in producing bricks of uniform quality and strength, regardless of the raw materials or environmental conditions.

Earth Pressure Machines:

Earth pressure machines handle varying types of soils, each with its own set of challenges. Our sensor’s robust design, capable of enduring the corrosive nature of some soils and the abrasive nature of others, proves invaluable. The quick and accurate pressure readings it provides enable operators to adjust machine parameters for optimal performance, ensuring efficient operations and reducing wear and tear on machinery.

SI-51 Miniature Pressure Sensor/Transducer

Posted on January 13, 2023 by KimGuo11

Miniature Pressure Sensor is also called Miniature Pressure Transducer. The miniature pressure sensor is a miniature solid-state silicon force sensor integrated with MEMS technology. One-piece miniature stainless steel package. Make it have excellent dynamic performance. Small size, streamlined, strong, compact shape structure.

RFQ Pressure Sensors

Features of Miniature Pressure Sensor

Product size Φ3, Φ5, M6, M8, M10. Can be specially designed according to specific working conditions;
Small size, streamlined appearance;
split structure. Optional standard voltage, current, digital signal output. Meet the requirements of various working conditions;
High dynamic frequency response, steep rising edge;
Wide measuring range. Any range between -100Kpa~0-10KPa…60MPa;

Specifications of SI-51 Miniature Pressure Sensor

Measuring range	-100KPa-0-10KPa…1MPa…60MPa
Measuring medium	Gases or liquids compatible with 316 stainless steel
Static accuracy	±0.1%FS ±0.25%FS ±0.5%FS
Dimensions	Φ3、Φ5、M6、M8、M10 (customizable)
Natural frequency	10KHz~1MHz
Product structure	Transmitter: split type
Signal output/power supply	4-20mA 0-5V 0-10V 1-5V	12-36VDC (Typical 24VDC)
	mV signal	Constant voltage source/constant current source
	Digital signal output RS485	5VDC/5-16VDC/24VDC
Operating temperature	-40～85℃
Compensation temperature	-10～60℃
Storage temperature	-40～100℃
Long term stability	Typical: ±0.1%FS/year Maximum: ±0.2%FS/year
Zero temperature drift	Typical: ±0.02%FS/℃ Maximum: ±0.05%FS/℃
Sensitivity temperature drift	Typical: ±0.02%FS/℃ Maximum: ±0.05%FS/℃
Overload capability	2 times full scale pressure or maximum 110MPa (take the minimum value)
Effective measurement life	﹥106 pressure cycles (P:10-90%FS)
Vibration resistance	20g （IEC 60068-2-6）
Impact resistance	20g，11mS
Resolution	Greater than 10-5 (usually limited acquisition and display equipment, theoretically infinitely small)
Load Resistance	≤(U-12)/0.02 Ω (current output) >100KΩ (voltage output)
Insulation resistance	200MΩ，100VDC
Electrical connections	Connector or direct cable 2m2m
Interface and housing material	304/316L stainless steel
Shell protection	IP65 (plug type) IP67 (cable type)
Explosion-proof	Ex iaⅡ CT5 (Intrinsically safe)
Seal ring	Fluorine Rubber
Sensor diaphragm	Stainless steel 316L
Product weight	The sensor is about 20-30 grams, and the transmitter is about 300 grams

Extended reading: NB-IoT Wireless Pressure Transmitter Networking Solution

Miniature Pressure Sensor/Transducer Applications

Water turbine and underwater weapon test
Fluid mechanics and hydraulic tests
Aircraft and Engine Tests
Aerodynamic studies
Biomedical Science
wind tunnel test
manufacturing
Equipment matching

More Featured Pressure Sensors & Transducers

**SI-390 Industrial Pressure Transmitter**

**SI-350 Sanitary Pressure Transmitter**

**SI-703 Flush diaphragm pressure sensor**

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

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

**High Frequency Dynamic Pressure Sensor**

**Capacitive Gauge Pressure Transmitter**

Stainless Steel Level Sensor-Pressure Guided Submersible Level Transmitter

Posted on September 26, 2022 by KimGuo11

Stainless Steel Level Sensor-Pressure Guided Submersible Level Transmitter (gas pressure type. ) The sensor part and the signal processing circuit are inside the junction box. It is used for high temperature, corrosive liquid, sewage, etc. The gas in the gas collecting cylinder is injected into the liquid Contact with the medium. The pressure is transmitted to the sensor through the air pipe. The direct contact between the sensor and the measured medium is avoided. It is suitable for occasions such as high temperature and strong corrosiveness. It effectively solves the problem of high temperature corrosive liquid and sewage level measurement. It is especially suitable for the measurement of high temperature, corrosive liquid and sewage.

RFQ

Features of Stainless Steel Level Sensor

With high temperature resistance, all parts in contact with the medium are made of stainless steel;
Adopt sensor, circuit full protection design, stable and reliable performance;
The pressure-inducing structure ensures long product life and high precision;
High temperature resistance, anti-clogging, anti-corrosion, anti-condensation, anti-sewage;
Solid structure, no moving parts, maintenance-free after installation and use;
High-temperature liquid, sewage, etc. can be measured with high precision. Not affected by media foaming and deposition;
Easy installation, simple structure, economical and durable;
With power overload current limiting protection;
No material fatigue wear, insensitive to vibration and impact, and widely used;

Technical Parameters

1. Range:	0-100m (liquid level height/depth);
2. Output signal:	4-20mA (two-wire system), 0-20mA, 0-5V, 1-5V, RS485;
3. Load capacity:	800<ERR>
4.Insulation resistance:	greater than 2000M2 (100VDC);
5. Power supply:	24VDC (9~36DCV);
6. Accuracy class:	0.5%FS;
7. Long-term stability:	≤0.2%FS/year;
Temperature compensation:	0-80℃
9. Medium temperature:	0~400℃;
10. Ambient temperature:	normal temperature (0~60℃);
Ambient humidity:	≤90%RH
12. Protection class:	IP68
13. Main structural material:	Pressure tube material stainless steel 1Cr18Ni9Ti;The junction box is metal cast aluminum,Gas cylinder material: 304 stainless steel (medium 37mm*200mm);Airway material: 304 stainless steel (medium 4mm); (can be bent at will)304/316 stainless steel pipe optional

Extended reading: Non contact level measurement

Stainless Steel Level Sensor-Pressure Guided Submersible Level Transmitter Working Principle

The Pressure Guided Submersible Level Transmitter selects the pressure transmitter as the pressure measurement component. The liquid level pressure signal is collected by the gas collecting cylinder and transmitted to the pressure transmitter to convert the pressure signal into the liquid level signal output.

The relationship between pressure transmitter and liquid level is: P=0.0098ρH+Pc

where:
P pressure MPa;
ρ liquid density (g/cm3);
H liquid level depth (m);
Pc liquid surface pressure (normal pressure is 0)

Extended Reading: How many types of level transmitters are there?

Applications

Stainless Steel Level Sensor-Pressure Guided Submersible Level Transmitter is a good choice for diesel testing.
Its biggest advantage is simple installation and low cost. Professional commissioning and installation, setup, etc. are not required. Just put the stainless steel probe into the tank and the solid gauge head.

In the petrochemical industry, large oil tanks require a large range of high-precision liquid level sensors to monitor oil level. At present, there are many methods for measuring oil tank liquid levels:

Servo level sensor
Radar level sensor
Hydrostatic liquid level transmitter
Magnetostrictive liquid level sensor

Extended reading: Oil Level Measurement Solutions for the Oil & Gas Industry

Extended reading: Magnetostrictive Level Transmitter Working Principle

One of the more important factors to consider when choosing a submersible level meter in the wastewater treatment industry is chemical compatibility and material selection. From potable water to highly corrosive acids, submersible level
Meters are necessary to measure nearly countless liquid chemicals.

Long service life;
High-precision measurement is possible from water, oil to viscous paste;
A wide range of temperature compensation is not affected by the foaming, deposition, and electrical properties of the measured medium.

Extended Reading: Low Cost Float Level Sensor for Tank Liquid Volume Monitoring

If you want to measure the liquid level of high temperature media, in addition to the available magnetic flap, the economical choice is the submersible high temperature Stainless Steel Level Sensor.

Since the medium is high temperature, the measurement method should avoid direct contact between the probe sensor and the medium. The probe sensor can only withstand a temperature of 60 degrees. For this reason, the submersible high temperature Stainless Steel Level Sensor is structurally designed to have the probe sensor above the medium and not in contact with the medium at all. . So no matter how high the medium temperature is, the submersible high temperature Stainless Steel Level Sensor can be used freely.

When installing, just find a hole larger than Φ37mm in the liquid level tank and put it directly. The submersible high temperature Stainless Steel Level Sensor is also equipped with a display for ease of use. Reasonable prices will make every customer satisfied.

Extended reading: Flat Pressure Sensor for High Viscosity Fluids

More than just liquid level, monitor your tank volume more effectively!

Our liquid level sensors can output liquid level signals, such as 4-20mA signal, 0-10V signal, RS485 and so on.

However, the liquid level transmitter alone cannot calculate the liquid volume of tanks of different sizes. It’s too complicated. A separate recorder is required to calculate it.

Therefore, the digital display volume meter can collect, display and convert the liquid level of various regular and irregular tanks in the industrial field into the corresponding tank volume. It is suitable for monitoring, controlling and collecting various process parameters.

Read more about: Capacitive Level Measurement System

More Featured Level Sensors

**Flange Mounted Differential Pressure Transmitter**

Differential pressure(DP) level transmitter

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

Wireless Level Sensor – LoRa

Posted on May 11, 2022 by KimGuo11

The Wireless Level Sensor upgrades the LoRa wireless transmission function based on the Hydrostatic Level transmitter. Measure water or oil level. This product adopts the LORA debugging method, which can greatly increase the communication distance. It can be widely used in the field of short-distance Internet of Things wireless communication in various occasions.

RFQ More Sensors

Features
Specifications
Wireless parameters
Connect and Install

Features of Wireless Level Sensor

Low power consumption, more than 3 years battery life;
-141dBm sensitivity;
Long launch distance, up to 10km;
Private protocol networking, high security.
RS485, Modbus output, compatible with traditional equipment

Specifications of Wireless Level Sensor

Medium	oil, water
Type	Absolute or gauge pressure
Range	0~300m
Precision	0.5%FS, up to 0.2%
Output	433MHZ
Power supply	12~36VDC or battery
Temperature	-30~60℃
Storage temperature	-40~85℃
Zero drift	≤±0.05%FS℃
Full voltage drift	≤±0.05%FS℃
Temperature compensation	0~70℃
Overvoltage	200%FS
Destruction pressure	500%FS
Response time	≤2ms
Load	(Current output)250~1425Ω(Voltage output)≥2KΩ
Seal	IP68
Long-term stability	0.1%FS/Year
Vibrate	0.1%FS

Specifications of Wireless parameters

Parameters	Performance		Remark
Operating Voltage	2.4~3.7V
Operating temperature	-40~85℃
working frequency	410–525MHz		434MHz is recommended, which can be configured in the program
Power consumption	launch status		≤100mA(17dBm)
Maximum transmit power	receive status	≤14mA	434MHz
	sleep state	≤2uA	434MHz
	19 ± 1dBm	User programmable
Modulation	LORA\2-FSK\GFSK\00K		Under LoRa modulation, performance advantages over traditional modulation can be obtained
Communication rate	FSK modulation mode: 1.2~300kbps 00K modulation mode: 1.2~32.768kbps LoRa modulation mode: 0.2~37.5kbps		User programmable customization, it is recommended to use LoRa modulation method at low rate (<5kbps)

Connect and Install of Wireless Level Sensor – LoRa

LoRa Wireless

LORa is one of the LPWAN (Low Power Wide Area Nerwork) communication technologies. It is an ultra-long-distance wireless transmission scheme based on spread spectrum technology adopted and promoted by Semtech in the United States.

LORa combines digital spread spectrum, digital signal processing and forward error correction coding technology. It has unprecedented performance. Designers can achieve both long distance and low power consumption. Maximize longer distance and lower power consumption The data communication has completely changed the situation in the field of embedded wireless communication.

Wireless Tank Level Sensor

The liquid level transmitter is upgraded by wireless remote transmission. This is an inevitable trend.

The battery-powered Wireless Level Sensor integrates the functions of liquid level acquisition, wireless reporting, and local digital display.

The wireless liquid level transmitter is easy to construct and ready to use. It is mainly suitable for places where power cannot be supplied on site and remote data transmission is required. It can be widely used in liquid level monitoring in urban water supply and drainage, sewage treatment, hydrology and water resources, fire protection, industry and other fields.

From a technical point of view, the Wireless Level Sensors we can currently provide mainly include:

Hydrostatic Wireless Water Level Sensor.
Ultrasonic wireless level sensor;
Radar wireless level sensor;
Guided wave radar wireless liquid level sensor;
Wireless float level sensor.

Extended reading: Ultrasonic Oil Level Sensor-External Paste-Truck Fuel Tank

The wireless remote ultrasonic level gauge can adopt two-wire, three-wire or four-wire technology. The power supply circuit and the signal output circuit are independent.

When using DC 24v power supply, a 3-core cable can be used, and the negative end of the power supply and the negative end of the signal output share a core wire.

When using AC 220v power supply, or when using DC 24v power supply. When the power supply circuit and the signal output circuit are required to be completely isolated, a 4-core cable should be used. DC or AC power supply, with 4~20mADC, high and low switch output.

The wireless radar level gauge has the advantages of no blind area, non-contact measurement, and is not affected by the physical characteristics of the measured medium. In recent years, it has been widely used in the field of petroleum and petrochemical.

Smart wireless technology eliminates the need for long-distance wiring in trenches and bridges. Save material, reduce labor costs, and reduce engineering and project execution time.

Smart wireless technology also makes automated user management easier, faster, and less expensive.

Integrating tank level gauges with smart wireless technology can reduce system installation costs by up to 50% by wirelessly connecting storage tank farms and control rooms. And can also reduce implementation time by up to 60%. The budget required to retrofit the automation of the storage tank farm is greatly reduced.

Wireless radar level gauge through Wireless Hart signal to wireless 1420 gateway;
1420 wireless gateway and the seamless integration of the host system;
The host system can be DCS, PLC, HMI.
The communication method between them can be Ethernet, Modbus, OPC.

Extended reading: Corrosive Liquid Chemical Level Sensor in Chemical Processing

chemical tank level sensor

Liquid chemical level sensor is suitable for chemical storage tanks or chemical processing. Especially for highly corrosive liquids.

In chemical storage tanks or chemical processes, there is a risk of corrosive liquids and explosions. Therefore, the requirements for the liquid level indicator are extremely high. SIRD-702 liquid chemical level sensor is a corrosion-resistant guided wave radar level sensor. The maximum range of anti-corrosion guided wave radar level meter can reach 20 meters. It is used to measure the liquid of strong acid and strong alkali. Such as hydrochloric acid, sulfuric acid, hydrofluoric acid, strong alkali and sodium hydroxide. SIRD-702 liquid chemical level sensor adopts all PTFE sealed cable or rod antenna.

Extended reading: Applicaitons Of Magnetostrictive Level Transmitters

Water Level Monitoring System

The Water Level Monitoring System is mainly composed of a telemetry station (Wireless Level Sensor, or wired level transmitter, etc.) and a platform management center.

The telemetry station mainly monitors real-time water level, rainfall, on-site images and other data information in various regions, and uploads it to the platform management center.

The platform management center receives and processes the data sent by the telemetry station through the monitoring and early warning platform, and warns decision makers of decision-making information according to their needs.

At the same time, the system can quickly release relevant early warning information through WEB, mobile terminal, SMS and other means. The Wireless Level Sensor system is a typical IoT system.

Frequently
Asked
Questions

Help Center

There are many kinds of sensors that can measure the water level. Or, it can be said that almost all types of liquid level sensors can be used to measure the water level.

Which sensor is best for water level indicator?

In terms of experience and cost. A hydrostatic water level sensor would be a good choice.

The wireless remote control water level controller is mainly an intelligent instrument designed for long-distance water tower and mountain top pool water level monitoring. It can not only monitor the change of water level, but also automatically control the start and stop of the water pump.

There are generally three parts, namely the water depth sensor, the transmitter and the receiver.

The transmitter is installed in the water tower. The receiver is installed in the control center. When the sensor is put into water, its output voltage is proportional to the water depth. The higher the water level, the higher the output voltage.

under the control of sequential circuits. Its water depth signal is transmitted to the receiver of the control center through the transmitting antenna. The receiver displays the water level data under the control of the program. And according to the set water level upper and lower limit value and water level alarm value, control the opening of the water pump, and send out the over-limit alarm signal in time.

Extended reading: water meter installation details

The water tank level monitoring system is widely used in various landmark buildings to complete the automatic water level display and alarm system of the fire water tank. All that is put into the liquid is a liquid level pressure sensor probe. The circuit part is in the junction box on the other end. It is convenient for users to adjust.

There are two types of installation methods: M20 x 1.5 thread installation and DN50PN0.6MPa (GB9119-88) standard flange installation. The display instrument is placed in the control room to display the water level of the pool in real time.

Extended reading: Float Switch Water Level Controller

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Sino-Inst offers over 20 Wireless Level Sensors. A wide variety of Wireless Level Sensors options are available to you. Such as free samples, paid samples.

Sino-Inst is a globally recognized manufacturer of Wireless Level Sensors, located in China.

Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide.

Wireless Level 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.

Request a Quote

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KimGuo11

drurylandetheatre.com

Cryogenic Pressure Transducers

Posted on February 26, 2021 by KimGuo11

Cryogenic pressure transducer for low temperature pressure measurement. -196℃～+125℃、-260℃/-350c（especial）.

The Cryogenic pressure transducer adopts a stainless steel integrated packaging structure, and the pressure-sensitive diaphragm adopts an excellent special design. It works safely and stably in an ultra-low temperature -196℃ environment. Used for cryogenic scientific experiments such as liquid oxygen/liquid nitrogen/liquid hydrogen/cooling tank/recommendant/low temperature storage tank.

Sino-Inst offers a variety of Pressure Sensors for pressure measure and control. If you have any questions, please contact our sales engineers.

Request a Quote

More Pressure Sensors

What is Cryogenic pressure transducer?

The Cryogenic pressure sensor adopts a stainless steel integrated packaging structure, and the pressure-sensitive diaphragm adopts a special design. This can make the sensor work stably in an ultra-low temperature -196 degrees Celsius environment.

Its advantages are small size and extremely high measurement accuracy. It brings convenience to scientific research work, high dynamic response frequency, strong corrosion resistance and long working life.

Even if the purchase cost is high, the later use value is much higher than its own value. In the future of technological development, low-temperature pressure sensors will be used more and more widely.

Features of Cryogenic Pressure Transducer

0-5vdc, 0-10vdc, 4-20mA Signal output optional
-196℃～+125℃、-260℃/-350c（especial）
Stainless Steel Construction
IP65 or IP67 enclosure
Product range: 0-2000bar

Extended reading: cryogenic fuel level indicator

Parameters of Cryogenic Pressure Transducer

Product range: 0-2000bar

Temperature: -196℃～+125℃, -260℃/-350c (especial)

Signal output: mv, 0-5vdc, 4-20mA, Hart, Rs485

Range: 0～0.2MPa…15MPa…60MPa Pressure type: absolute pressure, gauge pressure

Working voltage: 5-15VDC (10VDC) / 9-36vdc

Signal output: 0-5vdc, 0-10vdc, 4-20mA

Zero output: ±5%FS (typical)

Full load output: 10mV, 20mV, 100mV option

Linearity: 0.1%FS, 0.2%FS

Repeatability: 0.05%FS

Accuracy: ±0.25% FS, ±0.5% FS (default)

Room temperature: 0.1% FS, 0.2% FS, 0.5% FS

Low temperature: 0.5% FS% ~ 3% FS

Working temperature: -196℃～+125℃, -260℃/-350c (especial)

Low temperature zero drift: 1 ~ 4% FS (full-temperature zone)

High temperature zero drift: 1 ~ 4.5% FS (full-temperature zone)

Response frequency:> 1kHz or> 5kHz optional

Insulation resistance: ≥ 100MΩ/50V

Safe overload: 150% FS (1.5 times full scale)

Limit overload: 300% FS (3 times the full scale)

Vibration: 5 ~ 1000Hz, amplitude 2mm, X, Y, Z each to 30 minutes, the output changes less than 0.1% FS

Thread: M3, M4, M5, M6, M8, M10, M12 × 1 or a designated

Measuring medium: liquid oxygen/liquid nitrogen/liquid hydrogen, etc.

Humidity: 95% RH

Waterproof rating: IP65 or IP67 enclosure

Extended reading: Pressure indicator transmitters

Application of Cryogenic pressure transducer

Cryogenic pressure transducer has small size, high measurement accuracy, high dynamic response frequency, strong corrosion resistance and long working life.

Our professional technical group provides you with customized services. This product is mainly used for: low temperature scientific experiment, liquid

Oxygen, liquid nitrogen, liquid hydrogen, liquid helium, etc. Pressure and low temperature measurement of cooling tanks, cryogenic storage tanks, propellants, etc.
Cryogenic storage tanks for aerospace, aviation, naval vessels, etc.

If you need to measure not liquefied nitrogen and liquefied oxygen, but gas nitrogen and oxygen. You can refer to:

Industrial oxygen flow meters Nitrogen flow measurement

Extended reading: Cryogenic Flow Meters | Liquid Nitrogen-Liquid Oxygen

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**SI-300 Pressure Transducer 4-20mA/Voltage**

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Extended Reading: Resistive Pressure Transducer

Sino-Inst offers over 20 Pressure sensors. 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-Inst 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.

Request a Quote

Please enable JavaScript in your browser to submit the form

KimGuo11

drurylandetheatre.com

High Temperature Pressure Switch

Posted on December 16, 2020 by KimGuo11

High temperature pressure switch meets the needs of industrial use in special environments with high temperature and high pressure. The current maximum temperature can withstand 300℃.

The high temperature pressure switch pressure set point can reach 30MPa. The product is a fully electronic structure, and the front end adopts an oil-filled piezoresistive pressure sensor with isolation membrane. Through high-precision A/D conversion, processed by a microprocessor. On-site display, and output one analog quantity and four switching quantities plus 485 communication.

Sino-Inst offers a variety of Pressure Switches for pressure control. If you have any questions, please contact our sales engineers.

Request a Quote

More Pressure Switches

Specifications of High Temperature Pressure Switch

Pressure range:	Conventional (-0.1~0…0.1 0.25 0.4 0.6 1.0 1.6 2.5 4 6 10 16 25 40 60 100 160) MPa Micro pressure (0~1 2 5 10 25 40 60 100) kPa
Overload capacity	150% (>10MPa) 200% (≤10MPa)
Output form	Relay output, normally open normally closed
Output relay capacity	220V AC 5A
Power supply	220V AC; 24V DC; 380V AC
Setting range	The control point can be set in the full range section, and the anti-fluctuation hysteresis setting.
Accurate degree	0.5% FS
Warm degree	200°C
Measuring medium	Gas, water, oil
Operating temperature	-20～65℃
Connection size	G1/2 (four-point water pipe thread) M20*1.5 (pressure gauge interface) G1/4 (two divisions of thread)

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Differential Pressure Transmitter Installation Guide

What can the high temperature pressure switch do?

The high temperature resistant pressure switch is to amplify the pressure signal through a high-precision instrument amplifier. The data is collected and processed by a high-speed MCU. The built-in precision sensor is used for compensation. It is a high-precision device that detects pressure and liquid level signals. Realizes pressure and liquid level monitoring and control. .
It is widely used in automation systems for measuring gas and liquid pressure in chemical engineering, machinery, hydrology, electric power, environmental protection, etc. Because the adjustment is convenient and flexible, and the installation is simple, it can replace most occasions where liquid level switches are used.
The core of the product adopts a new type of intelligent micro-processing chip, with stable functions and practical performance.
LED displays the current pressure or level value.
The pressure or liquid level can be set to start or stop according to your needs.
Three units of four LED products can be selected according to customer needs: Mpa KG.F/CM2, PSI.
High and low pressure or liquid level alarm points can be set. And output to the control equipment through a relay or optocoupler; output dual-circuit relay (single pole double throw) switch value.
Two relays/two optocouplers/with 4-20mA/0-10V output can be selected.
It adopts high-precision pressure sensor, which has higher accuracy than mechanical high temperature pressure switch. It has small hysteresis, fast response, stable and reliable. There is no dead zone adjustment, and the relay action pressure point can be set arbitrarily within the entire range.
Use the buttons to adjust the action pressure, which is easy to use and more flexible. Protection grade: IP65, which can be used in harsh environments.

Extended reading: High Temperature Flow Meter

What is the difference between a pressure switch and a pressure sensor?

Pressure sensor is the most commonly used sensor in industrial practice. A sensor that can sense pressure and convert it into a usable output signal. The pressure switch is to open or close the system under a certain pressure to realize the detection, display, alarm and control signal output of the medium pressure signal. Ensure that the system is operating normally. Then the pressure sensor and the pressure switch are used as pressure-related instruments at the same time. What is the difference in the use of the two?

The pressure switch is a kind of switch as its name implies, but this kind of switch is a pressure set in advance. When the measured medium reaches this pressure, the switch can be turned on or off automatically. The pressure switch must be given a pressure value in advance, and then turn the switch on or off. Used for simple control, they are all on-off outputs.

The pressure sensor can output not only analog signal, but also digital signal output. Digital signal processing is more convenient, and remote transmission is also possible. The pressure sensor is composed of a pressure-sensitive element and a conversion circuit, which uses the pressure of the measured medium to act on the pressure-sensitive element to produce a small change in current or voltage output.

Sensors often need to be used in conjunction with external amplifier circuits to complete the process from pressure detection to control and display. Since the pressure sensor is a primary element, the signal feedback from the pressure sensor needs to be processed, analyzed, stored, and controlled by the measurement and control system. Make industrial automation equipment and engineering operation control more intelligent.

In terms of price, pressure sensors are naturally more expensive than pressure switches, because pressure sensors have internal signal conditioning circuits. But considering the service life and safety, the cost performance of the pressure sensor is much higher than that of the pressure switch. The after-sales service, product reputation, and market differences of pressure sensors are better than pressure switches. Obviously, the pressure sensor should be preferred.

The above is the difference between a pressure sensor and a pressure switch. I hope that the introduction of the editor can provide some help to everyone’s use.

Extended reading: Miniature Pressure Switch

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Sino-Inst offers over 10 Electronic Pressure Switches for pressure measurement. About 50% of these are liquid pressure swithces, 40% is gas pressure switches.

It is widely used in hydropower, tap water, petroleum, chemical, machinery, hydraulic and other industries to measure, display and control the pressure of fluid media on site.

A wide variety of High Temperature Pressure Switches options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of High Temperature Pressure Switch instrumentation, located in China.

KimGuo11

drurylandetheatre.com

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