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Author Topic: Is This a RTD  (Read 4311 times)

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Offline shopteacher

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Re: Is This a RTD
« Reply #20 on: May 03, 2004, 08:45:09 AM »
I can't seem to get this straight. Will this only show the temperature or will it show the temp( on the display )and also act like a household thermostat and turn on and off a device, for instance the vac pump like the Tstats controls the furnace?

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Offline Den Socling

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Re: Is This a RTD
« Reply #21 on: May 03, 2004, 09:09:40 AM »
A transmitter transmits the signal from a transducer. I don't know what the display does but the device doesn't look like a controller. A controller would have a relay, current or voltage output that responds to a setpoint and a process value.


Offline oakiemac

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Re: Is This a RTD
« Reply #22 on: May 04, 2004, 06:53:28 AM »
Sorry shopteacher, but those transmitters won't turn a pump on and off by themselves. They will show the temp and also put out a signal (4-20ma). If the transmitter is ranged for 0 thru 100 degrees, then at 0 it would put out 4ma, at 50 degrees or 50% it puts out 12ma, and 100 degrees or 100% it puts out 20ma.
You can get trip units which you can set to say trip at 50%. Then when your RTD is a 50 degrees it will close a set of contacts that you could wire to trip a larger current relay that in turn would turn your pump on. Then your transmitter and trip unit would work as a loop and serve the same function as a house thermostat and give you on/off control of the pump.
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