Why does the instrument use 40-20MA current signal?

Abstract: Why does the instrument use 40-20MA current signal? The information is provided to you by the excellent manufacturers of flowmeters and flowmeters. Why does the instrument use 40-20MA current signal? 1. The voltage signal is unstable and easily disturbed during long-distance transmission, while the current signal is relatively stable. The current signal is used in the transmission process, and the voltage is used in the specific control in the control instrument and the DCS system. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is why the meter uses 40-20MA current signal? Article details. Why does the instrument use 40-20MA current signal? 1. The voltage signal is unstable and easily disturbed during long-distance transmission, while the current signal is relatively stable. The current signal is used in the transmission process, and the voltage signal (range of voltage values) is used in the specific control of the control instrument and the DCS system. 2. The signal with the range of 0~20mA cannot be distinguished from the fault signal. Less than 4mA indicates that the line is faulty, or there is a suspicion of zero drift. The birth of the two-wire instrument has prompted the change of the standard, and the new standard of the current signal is 4~20mA. 3. The 4-20mA standard is set for the 2-wire sensor, and the current of 0-4mA is to supply the minimum working current of the sensor itself. If 0-20mA is used, when the signal is very small, the sensor will not be able to obtain enough. work energy. 4. In fact, for the 4~20MA signal, the general DCS system regards more than 20.2mA and less than 3.8mA as a fault. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Why does the instrument use 40-20MA current signal? 》

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