safety barrier
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I have just started working in the instrumentation industry. I would like to ask the experienced professionals: for thermocouple safety gates, the input is in millivolts, while for thermal resistor safety gates, the input is in ohms. So, in order to determine whether a safety gate is functioning properly, what signal should I measure at its output end? What other field instruments have an output of 4–20mA? Thank you all
Thermocouples and thermal resistors operate on different principles; you can understand this by looking at their mechanisms. There are many types of analog instruments, such as flow meters, valves, level gauges, and so on
Whatever signal it inputs, that’s the signal you need to apply; the output is usually in the 4-20 mA DC range. Instrument signals are generally transmitted as 4-20 mA standard signals, such as those from transmitters and level gauges
Please first check the instructions on the safety barrier; they will tell you about the signals to be input and the wiring method, as well as the type of output signals from the safety barrier. Making the corresponding judgment.