SI-3151T Direct Mount Pressure Transmitter | Smart Capacitive

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SI-3051T Direct Mount Pressure Transmitter | Smart Capacitive

SI-3151T Direct Mount Pressure Transmitter is a capacitive pressure sensor. It is mainly used to measure parameters such as pressure, negative pressure and absolute pressure of gases, liquids and steam, and then convert them into 4~20mA.DC signal output.

SI-3151T Direct Mount Pressure Transmitter is divided into two specifications: ordinary analog type and standard intelligent type according to the requirements of different domestic users. Among them, the intelligent series can be zero-adjusted or re-calibrated on the spot through the local button. Passive calibration and data configuration can also be realized through a handheld terminal or HART communication software.

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Pressure Sensors

Features of SI-3151T Direct Mount Pressure Transmitter | Smart Capacitive

  • Single isolation diaphragm design
  • Turndown ratio 50:1 or 15:1
  • With self-diagnosis and remote functions
  • With infrared wireless setting function
  • Implement HART protocol
  • Stainless Steel and Hastelloy CR Process Isolating Diaphragms
  • Select solid capacitive pressure sensor, high reliability and stability;
  • The overcut pressure is 10 to 100 times of the measured full scale pressure
  • It has various connection methods and materials such as thread, flange, sanitary type, etc., and has a wide range of applications. And can produce special forms according to user needs.

SI-3151T Direct Mount Pressure Transmitter Specifications

Action object:Liquid, gas and steam.
Power supply:DC24V;
Accuracy: ±0.5%FS; ±0.25%FS;
Range:-100KPa~0~60MPa;
Output signal:4-20mA, 0-5V, 1-5V, 0-10V, 0.5-4.5V
Communication: Smart HART protocol
Core: Capacitive core;
Diaphragm: Single isolation diaphragm design;
Membrane material:316L stainless steel/Hastelloy/tantalum;
Filling fluid: Silicone oil and inert oil;
Electrical interface: M20*1.5;
Waterproof grade: IP67;
Electrical explosion-proof: ExdIIBT4-6;
Medium temperature: -20-80℃
Storage environment:-40-85°C≤95%RH
Stability:0.2% FS year
Process interface: M20*1.5, G1/2, G1/4, etc. can be customized.

SI-3151T Direct Mount Pressure Transmitter Applications

SI-3151T Direct Mount Pressure Transmitter is widely used in petroleum, chemical, textile, building materials, electric power, metallurgy, medicine, food and other automatic detection and control fields. Measurement and control of liquid, gas and vapor related data.

  1. Petroleum / petrochemical / chemical industry
    It is matched with the throttling orifice to provide professional flow measurement and control. Measure pressure or liquid level in pipes and storage tanks.
  2. Electricity/city gas/other utilities
    It is required to measure occasions with high stability and high precision.
  3. Pulp and paper
    For transmitters that require resistance to chemical liquids, corrosive liquids, etc.
  4. Steel / non-ferrous metal / ceramics
    It is used in occasions requiring high stability and high precision measurement such as furnace pressure measurement. Used in occasions where stable pressure measurement is required under strictly controlled (temperature, humidity, etc.) conditions.
  5. Machinery/Shipbuilding
    Used in occasions requiring stable pressure measurement under strictly controlled (temperature, humidity, etc.) conditions.
Smart Capacitive Direct Mount Pressure Transmitter

Order Guide

Model Transmitter type
SI-3151TGP Pressure transmitter
SI-3151TAP Absolute pressure transmitter
Code Scale range
1 0-3.5～35kPa
2 0-10～100kPa
3 0-35～350kPa
4 0-0.1～1.0MPa
5 0-0.35～3.5MPa
6 0-1.0～10MPa
7 0-2.1～21MPa
8 0- 4.1～41Mpa
9 0- 6.0～60MPa
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 Structural materials
Pressure connector Isolation diaphragm Filling liquid
22 316 Stainless steel 316 Stainless steel Silicone oil
23 316 Stainless steel Hastelloy C Silicone oil
24 316 Stainless steel Monel Silicone oil
25 316 Stainless steel Tantalum Silicone oil
26 316 Stainless steel Titanium Silicone oil
27 316 Stainless steel Ceramic Dry
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
L4 M20×1.5 External thread M4 M20×1.5 external thread flushing film
L5 1/2NPT-14 External thread M5 1/2NPT-14 external thread flushing film
L6 1/2NPT-14 Internal thread M6 1/2NPT-14 internal thread flushing film
L7 G1/2’’External thread M7 G1/2’’External thread flushing film
L8 G3/4’’External thread M8 G3/4’’ External thread flushing film
L9 G1’’External thread M9 G1’’ External thread flushing film
LX Other types of threads MX Other models of thread flushing film
Code Optional parts
M4 LCD multi – power digital display head
B4 Pipe bending bracket
B5 Plate bending bracket
C02 M20 x 1.5 nut and Φ 14 pressure short tube
C12 1/2NPT-14 external thread and Φ14 pressure short tube
C22 1/4NPT-18 external thread and Φ14 pressure short tube
C32 1/4NPT-18 to M20×1.5 external thread
C42 1/2NPT-14 to M20×1.5 external thread
C43 1/2NPT-14 to 1/4NPT-18 internal thread
C44 1/2NPT-14 to 1/2NPT-14 external thread
C45 1/2NPT-14 to G1/2 external thread
X1 Oil ban
Da Flameproof  ExdIIBT5Gb;(explosion-proof certificate no. : CE16.1163)
Fa Intrinsically safe ExiaIICT4 / T5 / T6Ga;(explosion-proof certificate no. : CE15.2354X)
Selection example：SI-3151TGP4SF22AL2M4X1 0～1000kPa

Learn More About Smart Capacitive Direct Mount Pressure Transmitter

Capacitive Direct Mount Pressure Transmitter The two pressures of the measured medium are passed into the high and low pressure chambers, and act on the isolation diaphragms on both sides of the delta element (ie the sensitive element). The filling liquid in the spacer and element is sent to both sides of the measuring diaphragm.

The capacitive pressure transmitter is composed of a measuring diaphragm and electrodes on both sides of the insulating sheet to form a capacitor. When the pressure on both sides is inconsistent, the measuring diaphragm will be displaced. Its displacement is proportional to the pressure difference. , so the capacitance on both sides is not equal. Through the oscillation and demodulation link, it is converted into a signal proportional to the pressure.

Capacitive pressure transmitters and capacitive absolute pressure transmitters work on the same principle as differential pressure transmitters. The difference is that the pressure of the low pressure chamber is atmospheric pressure or vacuum.

The A/D converter of the capacitive pressure transmitter converts the current of the demodulator into a digital signal, and its value is used by the microprocessor to determine the input pressure value. A microprocessor controls the operation of the transmitter.

Additionally, it performs sensor linearization. Reset the measuring range. Operations such as engineering unit conversion, damping, square root, sensor fine-tuning, diagnosis and digital communication.

  1. Selection of pressure point

(1) The selected pressure measuring point should be able to reflect the true size of the measured pressure. The pressure taking point should be selected in the pipe section where the measured medium flows in a straight line. Do not choose in pipeline bends, bifurcations, dead ends and places where vortexes are easy to form.

(2) For the gas medium, a small amount of condensate in the gas should be able to flow back to the process pipeline smoothly, so the pressure tapping point should be in the upper half of the pipeline. For liquid-liquid medium, a small amount of gas precipitated in the liquid should be allowed to return to the pipeline. At the same time, prevent impurities and particles in the pipeline from entering the measuring pipeline and instruments. Therefore, the pressure point should be in the lower half of the pipeline, but not at the bottom of the pipeline.

  1. Laying of pressure guiding pipes

(1) The thickness of the pressure guiding tube should be appropriate, generally the inner diameter is 6~10mm. The length should be as short as possible, and the longest should not exceed 50 meters;

(2) When the pressure guiding pipe is installed horizontally, it should maintain an inclination of 1:10~1:20. To facilitate the discharge of liquid (or gas) accumulated in the pipe;

(3) A stop valve should be installed between the pressure port and the pressure gauge. In order to facilitate the maintenance of the pressure transmitter.

  1. Determination of the installation point

(1) The transmitter should be installed in a place that is easy to observe and repair.

(2) The installation site should try to avoid the influence of vibration and high temperature.

(3) When detecting liquids and steam with a temperature higher than 60°C, the source parts of the locally installed pressure transmitter should be equipped with an annular bend or a U-shaped condensation bend.

There are three installation forms of pressure transmitters: flange installation, pipe installation and short installation. Here is a brief description of the difference between the three installation methods of the transmitter and the installation methods.

The flange-mounted pressure transmitter is connected with the mounting flange of the transmitter and the matching flange on the tank by screws. There are two kinds of single flange and double flange, measuring pressure and differential pressure. This pressure transmitter can measure a variety of highly corrosive liquids, gases, and 300-degree high-temperature media. Easy to install but relatively expensive.

The pipe installation is to connect the pressure transmitter and the φ16 pipe with screw joints by the pressure taking pipe. If condensation treatment is required at high temperature, the anti-corrosion must increase the isolation tank and add isolation liquid. The price is relatively cheap, the performance is the same, and the pressure and differential pressure can be measured.

Short installation is to install the pressure transmitter directly on the pipe, usually with M20*1.5 thread. The temperature of the medium cannot be high, and the corrosion is not strong

Direct mount diaphragm seal pressure transmitter is formed by adding welding and sealing isolation diaphragm structure.

Its weld-sealed isolating diaphragm devices are available in a variety of process connection configurations. It is especially suitable for pressure measurement in high temperature, high viscosity, crystalline media and occasions that are easy to block. It is also suitable for pressure measurement in sanitary and medical occasions.

Typical applications: food, beverage, medicine and sanitation, paper making and other sanitary industry fields.

Applicable conditions

  1. It is necessary to isolate the high temperature medium from the transmitter.
  2. The measuring medium has a corrosive effect on the sensitive components of the transmitter.
  3. The measured medium solidifies or crystallizes due to environmental or temperature changes.
  4. The replacement of the measured medium requires strict purification of the measuring head
  5. Suspension liquid or high viscosity medium
  6. The measuring head must be kept clean.
  7. Measurement of sealed or open pressure vessels.

If you cannot find an answer to your question in our Direct Mount Pressure Transmitter, you can always contact us and we will be with you shortly.

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More Featured Industrial Pressure Transmitters

Sino-Inst is the manufacturer of SI-3151T Smart Capacitive Direct Mount Pressure Transmitter. Direct Mount Pressure Transmitter

There are many types of pressure sensors, such as resistance strain gauge pressure sensors, semiconductor strain gauge pressure sensors, Silicon piezoresistive pressure sensors, inductive pressure sensors, capacitive pressure sensors, resonant pressure sensors and capacitive sensors.

SI-3151T Direct Mount Pressure Transmitter is a high-sensitivity metal capacitive pressure sensor and a high-precision integrated circuit used in the measurement diaphragm detection circuit. It contains linearity and temperature compensation circuits inside, so the entire transmitter can achieve high precision and high stability. sex.

SI-3151T Smart Capacitive Direct Mount Pressure Transmitter has extremely high anti-overload performance and excellent performance in micro-pressure measurement. It is also a must-have product for various complex industrial environments.

SI-3151T Smart Capacitive Direct Mount Pressure Transmitter is mainly used to measure parameters such as gas, liquid and steam pressure, negative pressure and absolute pressure, and then convert them into 4~ 20mA.DC signal output.

The combination of the transmitter and the intelligent amplifying board can constitute an intelligent pressure transmitter. It can communicate with each other through a hand-operated device conforming to the HART protocol for setting and monitoring.

If you need to purchase a SI-3151T Direct Mount Pressure Transmitter | Smart Capacitive, or have any technical questions about Direct Mount Pressure Transmitter, please feel free to contact our engineers.

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    SI-3151T Direct Mount Pressure Transmitter |Smart Capacitive

    SI-3151T Direct Mount Pressure Transmitter is a capacitive pressure sensor. It is mainly used to measure parameters such as pressure, negative pressure and absolute pressure of gases, liquids and steam, and then convert them into 4~20mA.DC signal output.

    Product SKU: SI-3051T Direct Mount Pressure Transmitter | Smart Capacitive

    Product Brand: Sino-Inst

    Product Currency: USD

    Product Price: 250

    Price Valid Until: 2029-09-09

    Product In-Stock: InStock

    Editor's Rating:
    5