In the process of purchasing pressure transmitters, users need to describe and provide a lot of on-site working conditions and related parameters, so that the technicians of the pressure transmitter can choose products that adapt to their site conditions for you, but many users do not know or understand their own site conditions, and do not understand the pressure transmitter. In this way, there will be big problems in the purchase process. In fact, we understand the following points, and the problem will be solved.
The first thing we need to clarify is the medium measured by the pressure transmitter. Typically, pressure transmitters measure gases and liquids. However, some media have special properties, such as viscous liquids, granular liquids, and so on. Only by clearly defining the measuring medium can the correct pressure transmitter model be selected.
After confirming the specific model of the transmitter to be transmitted, it is necessary to determine the range range of the pressure transmitter. Generally, the range of the pressure transmitter is larger than the maximum value of the actual working conditions. In the use of pressure transmitters, affected by the field environment there are peaks and continuous irregular up and down fluctuations, (such as the interference of high-power equipment) This instantaneous peak can destroy the pressure transmitter and shorten the life of the pressure transmitter, so when selecting a pressure transmitter, the range of pressure should be fully considered.
The next step is to select the accuracy of the pressure transmitter. Accuracy classes are 0.1%FS, 0.25%FS, 0.5%FS, 1%FS. The smaller the number, the higher the accuracy. Simply put, the higher the accuracy of the pressure transmitter, the higher the accuracy, but the higher the price. We can select the accuracy class of the pressure transmitter according to the specific operating requirements and budget.
In a need to determine is the output signal of the pressure transmitter, due to various acquisition requirements, the market pressure transmitter output signal variety, the main ones are 4 ~ 20mA, 0 ~ 20mA, 0 ~ 10V, 0 ~ 5V, RS485 and so on. The current output is two-wire, the voltage output is three-wire, and the RS485 digital signal output is four-wire.
After determining the above parameters, it is also necessary to confirm the process connection interface of the pressure transmitter and the supply voltage of the pressure transmitter. If used in special occasions, explosion-proof and protection level should also be considered. These are selected according to the specific working conditions, for example, there are no requirements for explosion-proof on site, and it is enough to choose a conventional pressure transmitter.
If you have any questions, welcome to call: 400-600-4496, please indicate from the official website of Star Meter Manufacturing Co., Ltd