SMART HART Pressure Transmitter

Posted on April 10, 2019 by KimGuo11

HART pressure transmitter is an SMART pressure measurement product. It is compatible with analog two-wire 4~20mA signals and HART protocol.

Users can use HART communicator to manage, adjust or monitor process variables of HART instruments running in the process. It can also be configured on site using buttons for easy operation.

3051 HART Smart pressure transmitter that provides simplified field change, while communicating asset management data utilizing the latest HART 7 specification.

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

More Pressure Transmitters

What is a hart in a pressure transmitter?

What is a communication protocol? A communication protocol refers to the specification for data exchange between different devices. In a pressure transmitter, a communication protocol is used to achieve data transmission between the transmitter and other devices.

HART is a digital communication protocol used for communication protocols between field intelligent instruments and control room equipment. The HART protocol can establish two-way communication between a 4-20mA sensor and a controller equipped with a two-way HART communication circuit.

Therefore, the pressure sensor can send a digital signal to the controller through the HART protocol. The controller can send commands to the sensor to set and adjust parameters.

The HART communication protocol of the pressure transmitter provides two synchronous communication channels: a 4-20mA analog signal and a digital signal. The 4-20mA signal uses a 4-20mA current loop to transmit the main measurement value.

The HART protocol allows digital information to be transmitted on a 4-20mA transmission loop. Therefore, without adding equipment, the coexistence of digital and analog signals can be achieved.

The HART protocol can simultaneously transmit analog signals and digital signals. Therefore, it is widely used in practical applications.

HART communication uses a digital signal superimposed on the analog signal of the pressure transmitter to transmit other device information of the pressure transmitter.

The digital signal of the pressure transmitter contains information from the device. Including device status, diagnostics, additional measurements or calculated values, etc.

The combination of these two communication channels of the pressure transmitter provides a low-cost, highly reliable, and complete field communication solution for pressure transmitters that is easy to use and configure.

Benefits of HART pressure transmitters

4mA～20mA DC current output superimposed HART® protocol digital communication (two-wire system);
Adopt digital compensation and nonlinear correction technology;
-10℃～80℃ digital wide temperature compensation;
With local and remote zero and span adjustment functions;
Key operation on site for easy configuration;
Shorten troubleshooting time from discovery to problem solving;
Continuously verify the integrity of loops and control/automation system strategies;
Improve asset efficiency and system availability;
Quickly determine and verify control loops and device configurations;
Use remote diagnosis to reduce unnecessary on-site inspections.

Featured Industrial HART Pressure Transmitters

HART pressure transmitter is a complete product line of liquid level, differential pressure, gauge pressure and absolute pressure transmitter. Models include flushing diaphragms and sanitary flanges for liquid level measurement, hydrostatic tank metering – HTG. And wetted parts of various materials to suit the process requirements.

**Diffused silicon Gauge Pressure Transmitter**

**SI-390 Industrial Pressure Transmitter**

**Capacitive Gauge Pressure Transmitter**

**High-Temperature Pressure Transmitter**

What is a HART transmitter?

HART transmitters are much more complicated.
The HART transmitter has the same pressure input and 4-20 mA output. But it also has an analog current loop output. The device contains some digital variables and settings. Access to these digital parameters requires the use of a HART configurator or communicator. This is essential for maintaining these devices.
Just like Hart Communicator 375.
In fact, many HART devices, cannot be maintained without access to digital parameters.

What is HART calibrator?

HART calibrator is our HART communicator for calibrating instruments. For example pressure transmitter, DP transmitter, liquid level transmitter, flowmeter, and temperature transmitter.
HART communication protocol (Highway Addressable Remote Transducer) is a hybrid analog + digital industrial automation open protocol.
Its most significant advantage is that it can communicate through the traditional 4–20 mA analog instrument current loop, sharing only a pair of wires used by the analog host system.
We use this protocol in the HART calibrator.

HART communicator (such as HART 475) is the most common HART calibrator.
The proprietary calibration process ensures optimal temperature compensation. This limits the thermal impact on the sensor output.
It is suitable for the global process control industry. It provides a cost-effective solution for the use of conventional HART transmitters (such as the HART 475 field communicator).

How to calibrate a pressure transmitter using Hart?

A pressure transmitter is one of the most common instruments in a process plant. To assure its accuracy, it needs to be calibrated.

But what do you need to calibrate it and how is it done?

You may know how to calibrate a pressure transmitter? Or, how to calibrate a differential pressure transmitter? Then, calibrate HART pressure transmitters, kind of like pressure transmitter calibration using a hart communicator. Pressure transmitter manufacturers have improved accuracy and technology, designed into these smart pressure measurement devices.

To calibrate a pressure transmitter, you need:

loop supply (if not connected to the controls system’s loop supply);
a pressure generator to generate input pressure;
an accurate calibrator to measure the input pressure;
an accurate calibrator to measure the output mA current.

Typically, the pressure transmitter is a HART protocol transmitter. So in case, there is any need to adjust/trim it, you will need to use a device supporting HART communication.

How to calibrate HART pressure transmitters?

Explaining how to do the calibration would result in quite a long text. So we have put together a video for you instead. The video shows you how to calibrate and trim a HART pressure transmitter. Please have a look at the video: How to calibrate HART pressure transmitters

Video source: https://www.youtube.com/watch?v=4wLCqH0M9fU&t=9s

HART Pressure Transmitters Calibration Steps

How to calibrate HART pressure transmitters?

Total Time:

1. Isolate the transmitter from the process being measured and its loop wiring.

2. If measuring the mA signal across the transmitter test diode leave the wires intact, but note this method does not give the best mA measurement accuracy.

3. Connect the mA measurement jacks of the 754 to the transmitter.

4. Connect the pressure module cable to the 475, and connect the transmitter test hose from the hand pump to the transmitter.
Press the HART button on the calibrator to see the configuration of the transmitter.

5. Press HART again and the calibrator will offer the correct measure/source combination for the test.

6. If documenting the calibration press As-Found, input the test tolerance and follow the prompts.

7. If the measured mA signal at the test points is found within tolerance the test is complete.
If not, change is required.
Select, adjust, and trim the pressure zero, mA output signal and input sensor.

If you still do not know, how to check the pressure transmitter? Or, how to calibrate a pressure transmitter.

Just contact us.

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?

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

drurylandetheatre.com

Flange Mounted Differential Pressure Transmitter

Posted on April 1, 2019 by KimGuo11

Flange Mounted Differential Pressure Transmitter can be directly installed on the pipe or tank. Based on an ordinary pressure/differential pressure transmitter, a Flush flange or extended flange is added. It can be used for differential pressure measurement and liquid level measurement.

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.

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 to 20 mA DC signal corresponding to the measured differential pressure. It can also be configured with the HART protocol.

SMT3151LT Flange Mounted Differential Pressure Transmitter can replace EJA210E. It is a functional replacement for Rosemount 3051 and Yokogawa EJA.

Extended reading: How to calibrate HART pressure transmitters

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 liquid level 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 single-flange pressure/level transmitter can accurately measure the liquid level and density of various containers. There are two types of flat flange and plug-in 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

SMT3151LT Differential pressure (DP) level transmitter a new type of differential pressure (DP) transmitter produced by advanced technology and equipment. Continuous level, flow and differential pressure measurement. Liquid level measurement, is the most common measurement process in continuous production processes, such as: petroleum and chemical industry. The liquid level measuring instrument currently widely used, is the differential pressure level transmitter.

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

The Flange Mounted Differential Pressure Transmitter is directly mounted on the reserved flange at the bottom of the pipeline or container. It contacts the liquid through the isolation diaphragm.

When the diaphragm is pressurized, it will produce a slight deformation. The displacement of the diaphragm will move with the change of the differential pressure. This change is accurately converted into a 4-20mA DC two-wire current, voltage or digital HART output signal by the amplifier circuit to achieve pressure measurement and transmission.

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.

How to choose flange type level transmitter?

Flange-level transmitters often require special environmental processing during production. Requires small range and high accuracy. Flange-level transmitters are also required to withstand high temperatures, corrosion resistance, and high overload withstand capability. Therefore, the scope of application must be clearly defined when selecting the flange type liquid level transmitter.

When choosing a flange-type liquid level transmitter, the following factors are mainly considered:

The measurement object, such as the physical and chemical properties of the measured medium. And working pressure and temperature, installation conditions, speed of liquid level change, etc .;
Measurement and control requirements. Such as measurement range, measurement accuracy, and display method. On-site instructions, long-distance instructions, interface with computer, safety and anti-corrosion. Reliability and construction convenience.

When selecting a double-flange differential pressure transmitter, a very important factor must be paid attention to is the differential pressure level transmitter. It is installed at the bottom of the liquid container. The height of the liquid level is reflected by the gauge pressure signal. In the control process of liquid level measurement in the pharmaceutical and chemical industries. The container holding the liquid is often under pressure. At this time, the conventional static pressure liquid level transmitter cannot meet the measurement requirements. Due to improvements in the sensor circuit and structure. Improve the practical value of differential pressure liquid level measurement technology in the pharmaceutical and food industries.

**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 March 30, 2019 by KimGuo11

SMT3151DP Smart Differential Pressure Transmitter integrates differential pressure measurement, display, and transmission output. A smart differential pressure transmitter is used to measure the level, density, flow, and pressure of liquid, gas, or steam.

Smart Differential Pressure Transmitter Outputs standard signals (such as 4 ~ 20mA, 0 ~ 5V). It can also be configured with RS485 digital interface standard Modbus RTU protocol output. Or HART protocol.

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
PDF

Features of SMT3151DP Smart Differential Pressure Transmitter

Blue and white custom housing smart differential pressure transmitter

Output signal 4-20mA output+HART communication;
Push Button Configuration;
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

You may like the pressure level transmitter

Extended reading: How to calibrate HART pressure transmitters

Specifications of SMT3151DP Smart Differential Pressure Transmitter

Use object: liquid, gas or steam

Measuring a range of SMT3151DP smart differential pressure transmitter:

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)

Differential Pressure Transmitter PDF

SM3151DP-Differential-Pressure-Transmitter Download

Working principle of Smart differential pressure transmitter

SMT3151DP intelligent differential pressure transmitter uses advanced microprocessor technology and digital communication technology.

The basic principle of differential pressure transmitter is: to divide a space with sensitive elements (multi-purpose capsule) into two chambers. Introduce pressure into the two chambers separately.

The sensor produces displacement (or displacement trend) under the combined action of the two pressures. This displacement is proportional to the pressure difference (differential pressure) between the two chambers. Convert this displacement into a standard signal output that can reflect the magnitude of the differential pressure.

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.

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 13MPa, a high static differential pressure transmitter should be selected.

https://www.drurylandetheatre.com/wp-content/uploads/2019/03/SMT3151DP-smart-differential-pressure-transmitters-manufacturer.mp4?_=1

Frequently
Asked
Questions

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-Differential Pressure Tank Level Measurement

Posted on March 29, 2019 by KimGuo11

DP Level Transmitter uses pressure readings and the specific gravity of the medium to calculate the liquid level. Differential pressure level measurement is a common measurement technology. It can be used for closed-tank and open-tank level measurements.

The DP Level Transmitter measurement system includes differential pressure transmitters, flanges, seal diaphragms, capillaries, wet legs/dry legs, and DP transmitters.

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

Featured DP Level Transmitters

**Smart Differential Pressure Transmitter**

**Extended Diaphragm Seal DP Level Transmitter**

**Remote Seal Differential Pressure Transmitter**

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

Specifications of DP level transmitter

Measuring medium	Liquids, gases, and steam	Pressure range	0-0.1kpa-40mpa
Signal output	4-20mA, superimposed Hart protocol, RS485	Plywood material	All 316L stainless steel
Supply voltage	12-30VDC	Precision	± 0.2% FS, ± 0.1% FS, ± 0.075% FS (customizable)
Diaphragm material	316L, customizable Ha C, tantalum, Monel alloy	Temperature compensation	-10 ~ + 70 ℃
Long-term stability (1 year)	≤ ± 0.25% FS	Operating temperature	-20 ~ + 100 ℃
Overload pressure	200% FS	Zero range	External continuously adjustable
Destruction pressure	300% FS	Power effect	Less than 0.005% / V of the output range
Weight	3.9KG (standard type)	Protection level	IP65
Volume uptake	Less than 0.16cm3	Load impact	If the power supply is stable, the load has no effect

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.

Differential pressure type 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

You may like: pressure level transmitter

Industrial Magmeter Flow Meters

Posted on March 1, 2019 by KimGuo11

What is a Magmeter Flow Meter?

Magmeter Flow Meters are also called Electromagnetic flow meters or magnetic meters. Magmeter Flow Meter is a type of volumetric flow meter. It is mainly used to measure high-precision flow measurements of various conductive fluids. Such as water-based liquids, mixed media such as mud and sludge can also be measured.

Magmeter Flow Meters are based on the principle of electromagnetic induction. We Sino-Inst offer a range of full-bore and insertion electromagnetic meters. Covering pipe diameters from DN6 to DN3000. Accuracy can reach 0.5%.

Choose the Suitable Magmeter Flow Meters

**Magnetic Battery Operated Flow Meter**

Advantages of Magmeter Flow Meters

Suitable for measuring two-phase flow containing suspended matter, solid particles, fibers, etc. Such as mud, sewage, ore pulp, pulp, and other viscous slurries.
It uses four electrodes and a built-in grounding electrode. It is used for non-conductive pipes without the need for additional electrical rings.
It also has 420mA current signal output, pulse output, and instantaneous flow upper and lower limit alarm outputs. RS485 communication and HART protocol are also available.
On-site display of instantaneous flow, percentage, flow rate, forward and reverse cumulative flow, and total cumulative amount.
The power supply mode can be selected from AC85V~AC220V or DC24V.
Daily reports, monthly reports, annual reports, power failures, and other functions can be queried with one click.

More Flow Meters

First, let us look at the structure of the magmeter.

The structure of electromagnetic flowmeter is mainly composed of magnetic circuit system, measuring catheter, electrode, shell, lining and converter.

The electromagnetic flowmeter is made according to Faraday’s law of electromagnetic induction. It is used to measure the volume flow of conductive liquid.

Faraday’s law of induction (referring to the induction of an electric potential inside the conductor when the conductor passes through a magnetic field) is the basic principle of electromagnetic flowmeter measurement.

This measurement principle can be applied to conductive fluids.

The fluid flows into a pipe whose magnetic field is perpendicular to the direction of the fluid, and the electric potential induced in the fluid can be measured using two symmetrically arranged electrodes.

The signal voltage UE is proportional to the magnetic induction intensity B, the electrode spacing D and the average fluid velocity v.

Because the magnetic induction intensity B and the electrode spacing D are constant. Therefore, the signal voltage UE is proportional to the average flow velocity v.

The equation used to calculate the volume flow rate shows that the signal voltage UE is linearly proportional to the volume flow rate.

The sensed signal voltage is converted into the graduation in the converter, analog and digital output signals.

Magmeter flowmeters measure the velocity of conductive liquids (such as water, acid, caustic and slurry) in the pipeline. When measuring deionized water, the minimum conductivity of the medium is 20uS/cm. For most liquids, the minimum conductivity required for measurement can be 5uS/cm.

Magmeter is mainly used in the following areas:

Measure clean water, sewage, domestic water, raw water;
Various acid, alkali, salt and other solutions;
Mud, mineral pulp, paper pulp, and food liquids, etc.;
It is widely used in metallurgy, papermaking, water treatment, chemical industry, light industry, textile, food and beverage, catering, agricultural irrigation, hydropower station, oil production, electric power and mining industries.

Extended Reading: Guide: Magnetic Flowmeter Installation

Magmeter liner selection should be selected according to the corrosiveness, abrasiveness and temperature of the measured medium.

Hard/soft rubber is resistant to general weak acid and alkali corrosion. Temperature resistance is 65℃. Soft rubber has abrasion resistance.
Polytetrafluoroethylene (PTFE) is almost resistant to strong acid and alkali corrosion except hot phosphoric acid. The temperature of the medium can reach 130℃. But it is not resistant to wear.
Polyurethane rubber has good wear resistance. But it is not resistant to acid and alkali corrosion. Temperature resistance is also poor. The medium temperature is less than 65°C.

Liner Materials	Functions	Applications
Hard rubber	1. It is resistant to hydrochloric acid, acetic acid, oxalic acid, ammonia, phosphoric acid and 50% sulfuric acid, sodium hydroxide, and potassium hydroxide at room temperature. 2. Avoid strong oxidants.	1, below 70℃ 2. General acid, alkali, and salt solutions.
Soft rubber	1. It has good elasticity and good wear resistance; 2. It is resistant to the corrosion of general low-concentration acids, alkalis, and salt media, and is not resistant to the corrosion of oxidizing media.	1. Below 70℃; 2. Measure general water, sewage, mud, ore slurry
Polytetrafluoroethylene (PTFE) Modified polytetrafluoroethylene (PFA)	1. The material with the most stable chemical properties in plastics. It can withstand boiling hydrochloric acid, sulfuric acid, nitric acid and aqua regia, as well as strong alkalis and various organic solvents; 2. Poor abrasion resistance and adhesion.	1.-40℃~+130℃C(PTFE), -40℃~+160℃(PFA); 2. Strong corrosive media such as acid and alkali; 3. Sanitary media.
PO	1. It can withstand hydrochloric acid, acetic acid, oxalic acid, ammonia, phosphoric acid, sulfuric acid, sodium hydroxide, and potassium hydroxide at room temperature. 2. It can withstand concentrated alkali and various organic solvents.	1. Below 70℃; 2. General acid, alkali, and salt solutions; 3. General water, sewage, mud, mineral slurry.
Ceramics	Wear resistance, high temperature resistance, corrosion resistance	Below 200℃

1.Environmental conditions:

Magmeter flowmeter, especially the flowmeter with intelligent LCD screen. The installation position should avoid direct sunlight as much as possible. The ambient temperature should be between 5℃~55℃.

2.Avoid strong interference sources

Choose a place where there is no strong electromagnetic field radiation to install the flowmeter.

Avoid devices that can easily cause electromagnetic interference, such as motors, transformers, and frequency converters.

The measurement principle of the flowmeter is based on Faraday’s law of electromagnetic induction, the original
The initial signal is very weak, less than millivolt.

If there is strong electromagnetic field radiation near the flowmeter, it will affect the accuracy of the measurement and even fail to work normally.

3.Magmeter straight run

Pay attention to avoid eddy current generating parts as much as possible. Such as various valves, elbows, bypasses, etc.

Try to extend the straight pipe section upstream and downstream of the flowmeter. Install a rectifier tube if necessary.

Ensure that the upstream straight pipe section of the flowmeter must be at least 5 DN (measurement pipe diameter). The downstream is guaranteed to be more than 2 DN.

4.The conductivity of the liquid must be uniform and stable

Do not install the flowmeter in a place where the conductivity of the fluid to be measured is extremely uneven.
If different media are injected upstream, the conductivity will be uneven and will affect the measurement.

In this case, it is recommended to move the injection port downstream.

If it must be injected from upstream, it should be as far away from the flowmeter as possible. Generally, it is better to keep a distance of more than 20 DN. To ensure that the liquid is fully mixed and uniform.

5.Keep the electrode axis level

The plane of the intermittent measuring electrode must be kept level. This prevents short-term insulation between the two electrodes due to air bubbles.

6.Magmeter grounding rings

Since the induction signal of the electromagnetic flowmeter is very weak, it is susceptible to noise. Therefore, the reference potential of the sensor and the converter must be the same as the measured liquid, and be grounded together.

The purpose of installing grounding rings or grounding electrodes on both sides of the electromagnetic flowmeter is to establish the equipotentiality between the flowmeter casing and the liquid.

Ordinary metal pipe (generally no need to install grounding ring)

When the pipeline itself is well grounded, the grounding wire can be omitted, but the casing must be connected to the liquid through the grounding wire equipped with the flowmeter.

Insulated pipes (plastic pipes, rubber-lined pipes, etc.)

A grounding ring (or grounding electrode) should be installed at both ends of the sensor and the measured medium should be short-circuited with the earth through the grounding wire.

Cathodic protection pipeline

The pipe flanges are connected by copper wires, but they must be insulated from the grounding wire.

Magnetic flowmeter is a widely used flow measuring instrument. How should we calibrate it?

Let’s take a look at the calibration method of electromagnetic flowmeter:

Determine the corresponding water pump according to the pipe diameter and flow rate of the verification test;
After the flowmeter is correctly installed and connected, it should be energized and preheated for about 30 minutes in accordance with the requirements of the verification regulations;
If the high-level tank water source is used, check whether the overflow signal of the stabilized water tower appears. Before the formal test, use the verification medium to circulate in the pipeline system for a certain period of time. At the same time, check whether there is any leakage in the sealing parts of the pipeline;
The verification medium should be filled with the electromagnetic flowmeter sensor before the formal verification. Then the downstream valve should be closed to adjust the zero position;
At the beginning of the verification, open the valve at the front of the pipeline and slowly open the valve behind the electromagnetic flowmeter to adjust the flow at the verification point.
During the calibration process, the flow stability of each flow point should be within 1% to 2%-flow method. The total amount law can be within 5%.
- The temperature change of the verification medium should not exceed 1℃ when the verification process of a flow point is completed. It should not exceed 5℃ when the entire verification process is completed.
- There must be a sufficiently high pressure downstream of the electromagnetic flowmeter to be checked to ensure that no flashing and cavitation occur in the flow pipeline;
After the test, close the valve at the front end of the test pipeline. Then stop the pump to avoid emptying the voltage stabilization facility. At the same time, the remaining verification medium in the test pipeline must be vented and the control system and the air compressor must be closed.

Extended reading:
What is the K-factor in a flow meter?
Cryogenic Flow Meters|Liquid Nitrogen-Liquid Oxygen-LNG fluids

Magnetic flow meter pDF

Electromagnetic flowmeter Manual Download

Frequently
Asked
Questions

Help Center

A Rotameter flow meter is a variable area flow meter based on float position measurement. It is suitable for liquid and gas volumetric flow measurement and control.

All electromagnetic flowmeters need to be calibrated when they leave the factory. Each finished product needs to pass the calibration line inspection before leaving the factory.

It is to install the product on the assembly line. The front end adopts a strictly debugged standard table. A series of coefficients such as the diameter of the flowmeter, the damping coefficient, and the sensor coefficient of the electromagnetic flowmeter are set at the back end. To achieve the same flow rate as the standard meter.

If calibration is done on-site, it may generally be used to calibrate outside the sealed pipeline. Such as portable ultrasonic flowmeter. But the accuracy is generally 0.5. If you just check it, you can use a portable ultrasonic flowmeter.

Ultrasonic flow meters and electromagnetic flow meters have different measurement principles.

Electromagnetic flowmeter must measure conductive liquid. The ultrasonic flowmeter can measure pure single-phase liquid. It has nothing to do with the conductivity of the liquid.

The electromagnetic flowmeter must be in contact with the medium to measure. The ultrasonic flowmeter can do contact and non-contact measurement.

The electromagnetic flowmeter is a flow measuring instrument. The measuring principle of the electromagnetic flowmeter is measured according to its principle of conduction. Most of the flow measurement on the market is solved by electromagnetic flowmeters.

The electromagnetic flowmeter is a pure liquid volume measurement instrument.

The mass flow meter is a function of fluid volume and fluid temperature and pressure. Is a dependent variable. The quality of a fluid is a quantity that does not change with time, space temperature, and pressure.

Mass flow meters are compared with electromagnetic flow meters. It can measure non-conductive media. This is one of the biggest differences. In addition, the accuracy of the mass flow meter is higher. The cost is large, and there are fewer applications in the market.

There is a big difference in the performance of general-purpose electromagnetic flowmeters on the market. Some have high precision and many functions. Some have low precision and simple functions.

The basic error of the instrument with high accuracy is (±0.5%～±1%)R.
The instrument with low accuracy is (±1.5%～±2.5%)FS.
The price difference between the two is 1 to 2 times.

Extended reading: Orifice Plate Flow Meter

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Magnetic flow meter manufacturers

Sino-Inst is one of the reliable Magnetic flow meter manufacturers and suppliers in China. Magnetic flow meters are applied for wastewater flow rate measurement.

Sino-Inst offer over 20 Magnetic flow meters, at the Best Price. A wide variety of Magmeters options are available to you, such as free samples, and paid samples.

About 40% of these are magnetic flow meters, 30% are Insertion Magnetic Flow Meter, and 30% are sanitary flow meters. Magmeters products are most popular in North America, the Middle East, and Eastern Europe.

You can ensure product safety by selecting from a certified supplier, with ISO9001, and ISO14001 certification.

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KimGuo11

drurylandetheatre.com

Reliable Turbine Flow Meter Manufacturer

Posted on February 26, 2019 by KimGuo11

Sino-Inst is a Turbine Flow Meter Manufacturer from China. Our turbine flow meters are widely used to measure liquid and gas flow in a variety of industrial, commercial and laboratory applications.

Sino-Inst offers turbine flowmeters for liquids, gases, and more. We can provide you with precision flow measurement solutions at the best price.

RFQ Turbine Flow Meters

Sino-Inst is a leading manufacturer of turbine flowmeters, providing a variety of instruments used in many industries. Including water treatment, food and beverage production, and pharmaceutical research.

We offer a range of products suitable for almost all applications. These include:

Water turbine flowmeter;
Diesel turbine flowmeter;
304 SS and 316 SS turbine flowmeters with pulse or 4-20mA output;
Plastic material turbine flowmeter;
Low flow brass and 316 SS turbine flowmeter
Ultra-high pressure turbine flowmeter;
High temperature, extremely low temperature turbine flowmeter;
Gas turbine flowmeter, etc.

When you need reliable, accurate, and best-priced turbine flowmeters, Sino-Inst is your one-stop shop.

Featured Industrial Turbine Flow Meters

**Low temperature Turbine Flowmeter-Liquid Nitrogen Flow Meter**

Extended reading: High-quality hydraulic fluid flow meters

More Details About Turbine Flow Meter

A turbine flow meter is a type of flow meter that works by measuring the velocity of a fluid or gas as it passes through a turbine rotor. Turbine flow meters are commonly used to measure the flow of liquids and gases in a wide range of applications. They offer a high level of accuracy, especially in high flow rate applications, and can be used for both clean and dirty fluids. Turbine flow meters are also relatively easy to install and maintain, making them a popular choice in many industries.

Turbine flowmeter is composed of turbine, bearing, preamplifier and display instrument.

The principle of the turbine flowmeter is to place a turbine in the center of the pipeline, and the two ends are supported by bearings. As the fluid passes through the pipes, it strikes the turbine blades. Drive torque to the turbine. Make the turbine rotate by overcoming the friction torque and fluid resistance torque.

In a certain flow range, for a certain fluid medium viscosity, the rotational angular velocity of the turbine is proportional to the fluid velocity. Thus, the fluid flow rate can be obtained from the rotational angular velocity of the turbine, so that the fluid flow through the pipeline can be calculated.

The fluid to be measured impacts the turbine blades, causing the turbine to rotate, and the rotation speed of the turbine changes with the change of the flow rate. That is, the flow rate is large, and the speed of the turbine is also large. Then the rotation speed of the turbine is converted into electric pulses of corresponding frequency by the magnetoelectric conversion device. After being amplified by the preamplifier, it is sent to the display instrument for counting and display. According to the pulse number and cumulative pulse number per unit time, the instantaneous flow and cumulative flow can be calculated.

Turbine flow meters offer a number of advantages over other types of flow meters. Here are some of the key benefits of using turbine flow meters:

High accuracy: Turbine flow meters offer a high level of accuracy, especially in high flow rate applications. They have an accuracy of ±0.5% to ±1.0% of reading.
Wide flow range: Turbine flow meters have a wide flow range capability. They can measure flow rates from as low as 0.1 GPM (gallons per minute) to as high as 10,000 GPM, depending on the model and size.
Quick response time: Turbine flow meters have a fast dynamic response time, which means that they can measure changes in flow rate quickly.
Easy to install and maintain: Turbine flow meters are relatively easy to install and maintain. They don’t require a lot of space, and they don’t need a lot of external piping or support.
Versatile: Turbine flow meters can be used to measure the flow of a wide range of fluids and gases. Including hydrocarbons, chemicals, water, cryogenic liquids, air, natural gas, and industrial gases.
Customizable: Turbine flow meters can be customized to meet specific flow application requirements. Custom features may include: high temperature, extremely low temperature (-196 degrees Celsius), ultra-high pressure, extremely small diameter (DN4, DN6), etc.

Overall, turbine flow meters are a reliable and cost-effective method for achieving high accuracy flow measurement.

No, a rotary meter is a different type of flow meter than a turbine meter. While both are used to measure the flow of liquids or gases, they operate on different principles and have distinct designs.

A rotary meter, also known as a positive displacement meter, works by dividing the fluid or gas being measured into specific volumes and then counting the number of volumes that pass through the meter.

In contrast, a turbine flow meter works by measuring the velocity of the fluid or gas as it passes through a turbine rotor. The rotor spins at a speed proportional to the flow rate, and this motion generates an electrical signal that can be used to measure the flow rate.

While both types of flow meters are used for measuring the flow of liquids or gases, they are different in their operation and design.

As a Turbine Flow Meter Manufacturer- We Can Offer

Extensive customization services:

Product brand OEM
Product parameters customization:
- Temperature, high temperature or low temperature liquid (liquid nitrogen, liquid oxygen, etc.);
- Pressure, especially high pressure products, 16MPa, 25MPa, 32MPa, etc.;
- Small flow, small diameter (DN4, DN6);
- Signal output: pulse, 4-20mA, RS485, etc.;
- Hygienic customization: optional 304 stainless steel, 316 stainless steel, clamp installation;
- Connecting flange: Accept flange thread customization such as German standard DIN, American standard ANSI, and Japanese standard JIS.
Last but not least. We can offer you the most reasonable price. The cheapest price is not necessarily the best product. Reference: DN50 Turbine Flow Meter Price, FOB Price USD 298.00/set.

Industries & Applications We Serve

Sino-Inst is one of the reliable turbine flow meter manufacturers and suppliers in China. Of course, there are also many Leading Turbine Flow Meter Manufacturers in the international market. For example:

The turbine flow meters we supply from Sino-Inst include liquid turbine flow meters, gas turbine flow meters, etc. We can provide you with precision flow measurement solutions at the best price.

Sino-Inst’s turbine flow meters are made in China. Good quality and more favorable prices. Our flow measurement instruments are widely used in the United States, Indonesia, Singapore, and other countries.

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Posted on February 12, 2019 by KimGuo11

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drurylandetheatre.com

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