Flange Mounted Differential Pressure Transmitter

Flange Mounted Differential Pressure Transmitter

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.

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

ModelTransmitter type
SMT3151LTFlange liquid level transmitter
CodeScale range
40-4.0~40kPa(0-400~4000mmH2O)
50-20~200kPa(0-2~20mH2O)
60-70~700kPa(0-7~70mH2O)
70-210~2100kPa(0-21~mH2O)
CodeOutput form
ELinear output 4-20mAdc
SFLinear output 4-20mAdc +HART signal
FMODBUS-485 signal
CodeFlange standard (high pressure side flange)
AANSI American Standard (HG20615)
DDIN European Standard (HG20592)
CodeProcess connection size
ANSI American Standard (HG20615)DIN European Standard (HG20592)
251”DN25
401.5”DN40
502”DN50
803”DN80
04”DN100
CodeProcess connection pressure rating
ANSI American Standard (HG20615)DIN European Standard (HG20592)
A150LBPN16/25
B300LBPN40
C600LBPN64
D900LBPN100
CodeHigh pressure side diaphragm
A316 stainless steel
BHastelloy C
CMonel
DTantalum
ETitanium
FSpecial Requirements
CodeHigh pressure side insert tube lengthHigh pressure side insert cylinder material
A0 mmNone
B50 mm316L Stainless steel
C150 mm316L Stainless steel
D200 mm316L Stainless steel
CodeHigh pressure side filling fluid
DGeneral silicone oil  (-40~104℃)
FHigh temperature silicone oil   (-40~304℃)
SInert liquid  (-40~204℃)
Low pressure side structural materialFlange (joint)Exhaust/drain valveIsolation diaphragmSensor filling fluid
22316 Stainless steel316 Stainless steel316 Stainless steelSilicone oil
23316 Stainless steel316 Stainless steelHastelloy CSilicone oil
24316 Stainless steel316 Stainless steelMonelSilicone oil
25316 Stainless steel316 Stainless steelTantalumSilicone oil
33Hastelloy CHastelloy CHastelloy C Silicone oil
35Hastelloy CHastelloy CTantalum Silicone oil
44MonelMonelMonel Silicone oil
S2A remote transmission device (with a remote transmission device on the low-voltage side)
CodeShell materialConduit inlet dimensions
ALow copper aluminum alloy polyurethane coatingM20×1.5
BLow copper aluminum alloy polyurethane coating1/2-14 NPT
CStainless steelM20×1.5
DStainless steel1/2-14 NPT
CodeOptional parts
M10~100%  Linear indicator head
M4LCD multi – power digital display head
D1Side discharge valve at the top (only for the low pressure side of the low pressure side without remote transmission)
D2Side discharge valve at the top (only for the low pressure side of the low pressure side without remote transmission)
DaFlameproof  ExdIIBT5Gb;(explosion-proof certificate no. : CE16.1163)
FaIntrinsically safe ExiaIICT4 / T5 / T6Ga;(explosion-proof certificate no. : CE15.2354X)
CXWith 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.

  1. Viscous medium at high temperature;
  2. Easily crystallized medium;
  3. Precipitation medium with solid particles or suspended matter;
  4. Strongly corrosive or highly toxic medium;
  5. 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;
  6. Continuously and accurately measure the interface and density;
  7. 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;
  8. Places with high sanitation requirements;
  9. 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.

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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.

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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.

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Single flange. VS. Double flanges differential pressure level transmitter

  1. In principle: all are differential pressure transmitters + flange guide pressure;
  2. 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.
  3. 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;
  4. 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:

  1. 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 .;
  2. 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.

More Pressure and Level Measurement Solutions

Sino-Inst is one of the most excellent DP transmitters, pressure transmitters, and level transmitters suppliers. Sino-Inst can offer you a complete solution for pressure transmitters.

Sino-Inst can offer you with Flange Mounted Differential Pressure Transmitter. Our transmitters can work for you just like EJA210E.

Our Flange Mounted Differential Pressure Transmitters are widely exported to various countries. Including USA, UK, Argentina, Singapore, etc. If you need to purchase Flange Mounted Differential Pressure Transmitter, or have related technical questions, please feel free to contact our sales engineers!

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SMT3151DP Smart Differential Pressure Transmitter

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.

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:

ModelTransmitter type
DPPressure transmitter
HPAbsolute pressure transmitter
CodeScale range
20-0.10~3.5kPa(0-10~350mmH2O)
30-0.8~8.0kPa(0-80~800mmH2O)
40-4.0~40kPa(0-400~4000mmH2O)
50-20~200kPa(0-2000~20000mmH2O)
60-70~700kPa(0-0.7~7kgf/cm2)
70-210~2100kPa(0-2.1~21kgf/cm2)
80-700~7000kPa(0-7.0~70kgf/cm2)
90-2.1~21MPa(0-21~210kgf/cm2)
00-4.1~41MPa(0-41~4100kgf/cm2)
CodeOutput form
ELinear output 4-20mAdc
SFLinear/square root output 4-20mAdc +HART signal,,Full function buttons on site
FMODBUS-485 signal
Structural materialsFlange connectorExhaust/Drain valveIsolation diaphragmFilling liquid
22316 Stainless steel316 Stainless steel316 Stainless steelSilicone oil
23316 Stainless steel316 Stainless steelHastelloy CSilicone oil
24316 Stainless steel316 Stainless steelMonelSilicone oil
25316 Stainless steel316 Stainless steelTantalumSilicone oil
33Hastelloy CHastelloy CHastelloy CSilicone oil
35Hastelloy CHastelloy CTantalumSilicone oil
44MonelMonelMonelSilicone oil
CodeShell materialConduit inlet dimensions
ALow copper aluminum alloy polyurethane coatingM20×1.5
BLow copper aluminum alloy polyurethane coating1/2-14 NPT
CStainless steelM20×1.5
DStainless steel1/2-14 NPT
CodePressure connection
L11/4NPT-18 Internal thread(excluding waist joint standard)
L21/2NPT-14 Internal thread
L3M20×1.5 External thread
CodeOptional parts
M4LCD multi – power digital display head
B1Pipe bending bracket
B2Plate bending bracket
B3Pipe mounting bracket
C02M20×1.5 nut and Φ 14 pressure short tube
C121/2NPT-14 external thread and Φ14 pressure short tube
C221/4NPT-18 external thread and Φ14 pressure short tube
C321/4NPT-18 to M20×1.5 external thread
C421/2NPT-14 to M20×1.5 external thread
C431/2NPT-14 to 1/4NPT-18 internal thread
C441/2NPT-14 to 1/2NPT-14 external thread
C451/2NPT-14 to G1/2 external thread
D1The side discharge valve is on the upper part
D2The side discharge valve is on the upper part
X1Oil ban
DaFlameproof ExdIIBT5Gb;(explosion-proof certificate no. : CE16.1163)
FaIntrinsically safe ExiaIICT4/T5/T6Ga;(explosion-proof certificate no. : CE15.2354X)

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Differential Pressure Transmitter PDF

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.

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Smart Differential Pressure Transmitter Applications

SMT3151DP smart differential pressure transmitter is suitable for applications like:

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.

Frequently
Asked
Questions

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.

More Featured Pressure Measurement Solutions

Sino-Inst is a leading manufacturer in the field of measurement and control in China. One big reason for the continued growth of Sino-Inst is our willingness to listen to our customer’s specific needs.

Sino-Inst manufactures a wide variety of mechanical and electronic devices. To measure pressure, level measurement, temperature, and flow. And we’re working constantly to improve our product platform.

If you need to purchase Smart Differential Pressure Transmitters, or have related technical questions, please feel free to contact our sales engineers!

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DP Level Transmitter-Differential Pressure Tank Level Measurement

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.

Featured DP Level Transmitters

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

  1. Flat type
  2. Thread mounting type
  3. Flange mounting type
  4. Extended Diaphragm Seal
  5. Wet legs/Dry legs

Specifications of DP level transmitter

Measuring mediumLiquids, gases, and steamPressure range0-0.1kpa-40mpa
Signal output4-20mA, superimposed Hart protocol, RS485Plywood materialAll 316L stainless steel
Supply voltage12-30VDCPrecision± 0.2% FS, ± 0.1% FS, ± 0.075% FS (customizable)
Diaphragm material316L, customizable Ha C, tantalum, Monel alloyTemperature compensation-10 ~ + 70 ℃
Long-term stability (1 year)≤ ± 0.25% FSOperating temperature-20 ~ + 100 ℃
Overload pressure200% FSZero rangeExternal continuously adjustable
Destruction pressure300% FSPower effectLess than 0.005% / V of the output range
Weight3.9KG (standard type)Protection levelIP65
Volume uptakeLess than 0.16cm3Load impactIf the power supply is stable, the load has no effect

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:

  1.  When the measured medium has a corrosive effect on the transmitter connector and sensitive components;
  2. When the high temperature measured medium needs to be isolated from the transmitter;
  3. 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;
  4. When the measured medium is easily cured or crystallized by the pressure tube;
  5. When changing the measured medium needs to be rinsed and not to be mixed;
  6. Hygienic conditions must be maintained to prevent pollution. .
  7. Changing the measured medium requires strict purification of the measuring head
  8. Suspended liquid or high viscosity medium
  9. Measurement of sealed pressure vessel.

Read more What is a diaphragm seal?

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.

Read more about: Differential Pressure Transmitter Installation Guide

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:

  1. 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).
  2. When there is no liquid in the differential pressure liquid level transmitter. Adjust the zero potentiometers. Make it output a current of 4mA.
  3. Pressurize the differential pressure liquid level transmitter to full scale (10 meters). Adjust the full-scale resistor. Make it output a current of 20mA.
  4. Repeat the above steps two or three times until the signal is normal.
  5. Please input 25%, 50%, and 75% signals to check the error of the differential pressure liquid level transmitter.
  6. 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.
  7. After adjustment, tighten the protective cover.
  8. The verification cycle of the differential pressure liquid level transmitter is once a year.
  9. 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.

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More Pressure and Level Measurement Solutions

Sino-Inst (drurylandetheatre.com) offers over 20 DP transmitters for liquid level, pressure, flow, and density measurement. Differential pressure (DP) level transmitters are suitable for measuring water and other liquid level.

We are a differential pressure level transmitter supplier, located in China. Our products are widely exported to the United States, Australia, Singapore, Indonesia, etc. You can ensure product safety by selecting from our products, including IOS9000, and… certification.

If you need to purchase DP Level Transmitters or have related technical questions, please feel free to contact our sales engineers!

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