The ultimate purpose of the pressure transmitter is to convert the pressure parameters of gases, liquids and other physical quantities measured by the measuring element into standard signals, and output them to secondary instruments such as indicating alarms, recorders, regulators and so on for measurement, indication and process adjustment. The choice of the output signal of the pressure transmitter is of great importance to the entire measuring system. The conventional pressure transmitter output signal has three forms: 4~20mA current output, 0~10VDC, 0.5~2.5VDC and RS485 digital output signal. 1. Pressure transmitter 4~20mA current output signal: Current output is the most commonly used signal output method for pressure transmitters, which is related to its performance characteristics. The current output signal is not susceptible to parasitic thermocouples and resistance voltage drop and temperature drift along the wire; It is less disturbed by external signals; In the case of long cable lengths, the transmission quality of the measurement signal is not affected. 2. Pressure transmitter 0~10VDC, 0.5~2.5VDC and other voltage output signals Most of the early pressure transmitters used voltage output signals, that is, the measurement signals were converted into voltage outputs such as 0~10VDC and 0.5~2.5VDC. However, when the signal needs to be transmitted over long distances or when the power grid interferes with a large amount of power in the use environment, the use of voltage output pressure transmitters is greatly limited. 3. RS485 digital output signal of pressure transmitter The RS485 output signal is digital. It has a strong ability to resist interference; Facilitate the integration and processing with computer use; Easy to store information. In the signal processing of modern technology, digital output signals play an increasingly important role in pressure transmitters. The current output and voltage output signals are collectively referred to as analog signals, and the RS485 digital output signals are digital signals. Users need to choose according to their own usage conditions. It should be noted that the wiring method of each type of output signal is completely different, and users should pay attention to distinguish between them during use and installation. Star Meter Technology Co., Ltd. is a high-tech enterprise integrating R&D, production and sales. Specializing in the production of pressure transmitters, liquid level transmitters, temperature transmitters, temperature and humidity transmitters, differential pressure transmitters, soil moisture transmitters, 3051 transmitters and related instrumentation accessories. A number of products under the Xingyi brand have obtained a number of patent certificates issued by the state, such as CE certification, IS9001 certification, SGS certification, TüV SüD certification, explosion-proof certification, etc. If you have any questions about product consultation, product customization, agency, technical inquiry, quotation, etc., please contact Xingyi: 400-600-4496!