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Old 07-09-2012, 11:51 PM   #1
lunchbox
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Default Temperature probes vs dial thermometers

I'm designing my HERMS system, and I've been trying to decide whether to use dial thermometers or temperature probes.
My question is...

If I use the temperature probes like those used here, do I have to connect them to a PID like they have? All I'd really like is a digital read-out that I can have on my control panel.

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Old 07-10-2012, 12:51 AM   #2
carlisle_bob
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Hi

You can connect them to a *compatible* digital readout. The probe in the link is a 100 ohm RTD. That's different than a 10K ohm NTC or a type K thermistor. As long as the readout is expecting the probe you have, it will read out.

In many cases it's cheaper to buy a readout + sensor than to buy them separately. The gotcha there is that you then need to adapt their cheap sensor to your setup.

Some math:

Cheap sensor + probe, brand new - eBay $6 delivered. Plus stuff to make it like the one in the picture total -> $35.

Sensor like the one in the picture - $25. Plus cheap eBay PID total -> $35 to $40.

Bob

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Old 07-10-2012, 05:25 PM   #3
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What about these?
http://www.aliexpress.com/store/prod...500773995.html
http://www.aliexpress.com/store/prod...500781120.html

What's the difference between RTD and type K?

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Old 07-11-2012, 04:31 PM   #4
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Quote:
Originally Posted by lunchbox View Post
Hi

The first one is for a K type thermocouple. It will not work with the probe in your original post. The second one appears to work with an RTD. It needs 24 VDC power...

Bob
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