How to test an Isspro thermocouple?

[Trotorx2]

What should an Isspro thermocouple read cold for resistance? I've been noticing my egt's varying over 100 degrees on smooth flat road with cruise set. Also last weekend I was noticing over 200 degree changes while towing my 5th wheel. I'm guessing that checking resistance will tell me if it is bad. I have a Barfield TT1000 thermocouple tester at work for testing the thermocouples on my helicopter engines I'm wondering if that will tell me anything?

 

[Trotorx2]

I guess no one knows how to test one of these thermocouples?

 

[PureHybrid]

You shouldnt read resistance, thermocouples create thier own current. Hook up a volt meter to it, heat up the tip and see if the voltage climbs steady. It depends on what type it is, usually they run bewteen 0-5v.

 

[PureHybrid]

Might call and ask Isspro, but its probably a k-type. That tester you have should work fine I would think.

 

[Trotorx2]

I'm sure it is a K type. The thermocouples on my helicopter engine have a resistance check done on a cold engine. I'll go to Isspro's site and see what thay say.
Thanks Jesse.

 

[PureHybrid]

No problem. The resistance check is probably just to see if the thermocouple is damaged or not, generally it shouldnt see more than one or two ohms.

 

[Trotorx2]

I found info at the Isspro site but I think they have changed their gauges some since I bought mine. I was thinking that the probe was getting bad as the temps seem to fluctuate some over the same road conditions.