Generally, what kind of signals require two sets of instruments?
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As the title suggests, some parameters in PID require both on-site instruments and remote transmission instruments； And for some, just one set is enough. Could you tell me which parameter measurements require two sets of meters? For example, the parameters on the pipelines of the inlet and outlet devices ； For example, is it necessary to do it on-site with the table? Thank you!
Some instruments have a remote transmission function, while others don’t
Generally, there are displays for liquid level, pressure, and temperature inside the room, and corresponding instruments are also available on-site to facilitate verification and comparison.
It depends on the measurement method and instruments used, as well as whether on-site instruments need to be installed. For remote temperature measurement, thermistors or thermocouples are generally used, while on-site display instruments are usually thermometers (rod thermometers, bimetallic thermometers, etc.). However, temperature transmitters with on-site display and signal transmission functions can also be installed... It depends on the actual circumstances.
Do on-site and remote transmission. It is generally used on-site for proofreading purposes. Additionally, current regulations require it, such as for major hazard sources and the like.