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Post by alcrityf174 on Sept 27, 2017 14:40:42 GMT -5
0.57V Sounds like you may have a DT-670 sensor. On the DT-670 curve, 0.57V would indicate 295.5K I think you are correct, Started up the system, from RT to 35K and still dropping. Very happy. Thanks
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Post by alcrityf174 on Sept 27, 2017 11:48:23 GMT -5
Many thanks, No magnets involved. I misunderstood the current value. Was using 10ma rather than 10uA
Now I have a reading of 0.57v So 21.85 deg C. That makes more sense. Thanks for the advice it's much appreciated.
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Post by alcrityf174 on Sept 27, 2017 10:53:30 GMT -5
Hi, I was hoping to get some advice ref these temp sensors. Here in our lab we are trying to reinstall an antiquated cryogenic tool. Basically a heat exchanger connected to a cryo cold head. The heat exchanger has two temp sensors. I carried out some basic tests, they have two wires connected to an electrical connector outside of the vacuum vessel. They seem to be some version of a diode. I made up a set of jumper leads to turn the two wires into 4 wires. Then using a lakeshore current source and a multimeter attempted to measure the voltage drop and using the standard charts obtain a temp. Current source is set to 10ma. Unfortunately the voltage drop measured does not relate to anything on these charts, I am getting 0.867v nowhere near what I was expecting for rt. Not my field of expertise so any advice greatly appreciated.
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