I’m asking if there is such a gauge
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There is a liquid level that is increased to a random height each time. There are two level gauges: one is a Yokogawa 110 model based on differential pressure, and the other is a model 118. Once the liquid level reaches this random height, a set point can be defined; by pressing a button, if the value measured by the 118 model gauge differs from the value indicated by the 110 model gauge by a specified amount, an alarm is triggered
There is a level controller in the Far East that can issue alarm signals for deviations in the levels of two streams, or it can send the data to the DCS for further processing and alarm generation
It’s easy to do on a DCS, and some digital displays also have this function.
I’ve only heard of two-wire temperature difference alarms; I’ve never heard of anything called a 4-20MA deviation alarm. Just use a PLC directly – it’s extremely simple and not expensive either. If there is a DCS, just do it within the configuration – no cost at all.
A digital subtractor with an alarm output function can also be used, by setting an alarm for a certain difference.