Posts Tagged temperature measurement

Wiring industrial thermocouples: Basic tips and suggestions

One thing I’ve learned in this industry: Even though there are standards to thermocouple color codes and types, the most basic rule for installation (In the US, when you’re wiring a thermocouple, RED is always negative) is non-intuitive to anybody who’s ever done electrical wiring.

It’s pretty easy to tell when you’ve done it wrong: You wire the thermocouple directly into an instrument, and as the process gets hotter, readings say it’s cooling down. As your process cools down, the readings show a rise in temperatures.  If you reverse the wiring at a junction box, it’ll read in the right direction, but you’ll have errors because of the false junctions.

Here are some basic wiring diagrams from the reference section of the Lesman catalog, with rules to follow, and some suggestions on specifying the right thermocouple wire.

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Which temperature sensor do I need? An RTD or a thermocouple?

Temperature is probably the most measured parameter across applications and industries we work with on a daily basis. But there’s still confusion as to what temperature sensor to use.

I very often hear the Lesman inside sales team talking a customer through the selection process, so I thought I’d provide a quick tutorial on temperature sensor selection.

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