What is the working principle of pressure transmitter? How to wire the pressure transmitter?

Principle description:

Usage: The pressure transmitter is mainly used to measure the pressure, negative pressure and absolute pressure of gas, liquid and steam, and then convert them into 4-20 mA DC signals for output.

Pressure transmitters include GP type (gauge pressure) and AP type (absolute pressure). GP and Ap can be combined with intelligent amplification board to form an intelligent pressure transmitter, which can communicate with each other through hand-held devices conforming to HART protocol for setting and monitoring. The δ chamber of GP type pressure transmitter can be used to measure gauge pressure or negative pressure because one side receives the measured pressure signal and the other side is connected with atmospheric pressure. The δ chamber of AP type absolute pressure transmitter receives the measured absolute pressure signal and the other side is sealed as a high vacuum reference chamber, which can measure exhaust system, distillation tower, evaporator and so on.

Principle: There are several commonly used principles, such as capacitance, resonant beam and silicon diffusion!

Capacitive pressure transmitter mainly consists of chamber sensitive components to realize pressure \ capacitance conversion and 4-20mA electronic circuit board to convert capacitance into two-wire system! When the process pressure is applied to the isolation diaphragm from two sides (or one side) of the measuring chamber, it is transmitted to the central diaphragm of the chamber through silicone oil filling liquid. The central diaphragm is a diaphragm with tight edges, and under the action of pressure, it produces corresponding displacement, which forms a differential capacitance change! And through the adjustment, vibration and amplification of electronic circuit board! Convert to 4-20mA signal output! The output current is proportional to the process pressure!

Discussion on matters needing attention in field installation of pressure transmitter

As a precise instrument, the pressure transmitter needs to pay special attention to some problems when it is installed on site, so as not to cause the pressure transmitter to be damaged or fail to work normally due to incorrect installation. The following are some matters that should be paid attention to when installing the pressure transmitter on site:

1. All pressure transmitters are delivered with product certificate and instruction manual, including product number, technical parameters, wiring diagram, delivery date, etc. Please check them carefully to avoid misuse.

2. During installation, check whether the field interface is consistent with the pressure transmitter interface according to the connection mode and thread type of the pressure transmitter. If it is a threaded interface, tighten it slowly and pay attention to sealing. Torque cannot be directly applied to the transmitter shell, but only to the six sides of the pressure interface.

3. Pay attention to the outlet modes of the pressure transmitter, including two-wire, three-wire and four-wire systems, and the wiring should be strictly in accordance with the requirements of the product instructions of the pressure transmitter.

4. The pressure transmitter is a precise transducer instrument, and it is forbidden to disassemble, collide, drop or slam at will.

5. The pressure transmitter can work when it is electrified, but the output is stable after preheating for 30 minutes.

6. If any abnormality is found during the use of the pressure transmitter, the power supply should be turned off, and the pressure transmitter should be stopped for inspection, or directly referred to the technical department of the manufacturer.

7. Be careful not to break the sheath of the induction wire during installation and use.

8. Effective lightning protection measures should be taken at the installation site.

9. When the pressure transmitter is transported, or when it is idle for storage, it shall be kept in a cool and dry warehouse.

In addition, the pressure transmitter has been adjusted to zero and range before leaving the factory. If you feel it is necessary to check it yourself, or if you need to check it after using it for a period of time, you can do the following operations: the output of the 4~20mA pressure transmitter should be 4mA without pressurization, if not, adjust the zero resistor until the output is 4mA; When the pressure is added to full scale, the output is 20mA; if not, adjust the full-scale resistor until the output is 20mA.

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