Posts Tagged RTD

How do I get an RTD signal to two different devices?

RTDs are great temperature sensors – accurate and easy to install.  But they are not friendly when it comes to trying to get a single RTD to go to two places, like when an RTD temperature measurement has to go to both a controller and a recorder.  People call and ask, “How do I split an RTD signal?”  The short answer is, “You can’t.”

An RTD cannot be wired in parallel or in series to a second device.  Any RTD input supplies a known, regulated ‘excitation’ current to the RTD.  Mixing RTD inputs would mix currents and that’s a Big No-No.

There’s also a lead wire compensation circuit for 3- or 4-wire RTDs that would create problems if a single RTD were connected to two different RTD inputs.  There’s just no feasible means of making two RTD analog inputs play nice together.

But all is not lost. There are several ways to achieve your goal.

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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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