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Experience BSEE, MBA, Design, R&D, University Research.
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I have 4-20mA temp sensor with temp range -50 - +150 C, is there any methode to measure when this sensor fail or have large deviation?
Thanks
Answer There are many different kinds. I am assuming you are talking about a basic type which uses a thermocouple. These are resistive devices which change resistance with temperature change. They can input to a digital or an analog system. If you want to know if the unit it working the resistance of the sensor can be measured. If you are asking about the long-range reliability or failure point at end of life you must study the manufacturers data for it. But, mostly they are long life apparatus and will fail only when the temperature exceeds the operating range. If they are immersed into a very hot environment it can melt the solder or weld that connects the two dissimilar materials together.
For large deviation it would be indicated by a radical change in the resistance of the thermocouple element.
