Pressure transmitter is a common pressure measuring instrument, which is mainly used for working conditions that need to measure pressure, such as pipeline pressure, tank pressure, pressure in vessels, etc. Regardless of the working conditions and environments measured, most pressure transmitters use the current signal output method, which is related to the advantages of the current output. There are many advantages to the current output of pressure transmitters: First, the pressure transmitter is not susceptible to the influence of parasitic thermocouples and resistance voltage drop and temperature drift along the wire, and the conventional wire can meet the requirements of working conditions; This saves a lot of cable and installation costs. Second, when the output resistance of the current source of the pressure transmitter is large enough, the voltage in the wire loop induced by the magnetic field coupling will not have a significant effect, because the current caused by the interference source is very small, and the interference can be reduced by using twisted pairs. Three-wire and four-wire systems must be shielded wires, and the shielding layer of the shielded wires should be properly grounded. Thirdly, capacitive interference will cause the receiver resistance to produce related errors, for 4~20mA two-wire loops, the receiver resistance is usually 2508 (sampling Uou t=1~ 5V) This resistance is not small enough to produce significant errors, therefore, the allowable wire length is longer and farther than the voltage telemetry system. Fourth, each single reading device or recording device of the pressure transmitter can be switched between different channels of unequal wire length, and the difference in accuracy is not caused by the unequal length of the wire, so as to realize decentralized collection and centralized control. Fifth, 4mA is used for zero level, which makes it very convenient to judge open circuit and short circuit or damaged pressure transmitter (0mA state). Sixth, it is very easy to add one or two lightning and surge protection devices to the two-wire output port of the pressure transmitter, which is conducive to safety lightning protection and explosion protection. If you have any questions about product consultation, product customization, agency, technical inquiry, quotation, etc., please contact Xingyi: 400-600-4496!