Banks pyrometer gauge issues

[Thewespaul]

I’ve got this gauge on the ambulance, and I’m having issues getting it to work.

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Everything is wired according to the banks diagram and the needle increases with temperature but it gets stuck at the highest point and will not decrease in temp until the power is shut off. Sounds to me that the gauge is bad itself but the sender is okay. What do y’all think?

 

[centennial60]

The gauge has power going to it? My banks pyro just has the + and - from the thermocouple. But it may be an older version. Either way it sounds like the gauge is bad. If you had an open in the thermocouple wiring it would go to zero and if the thermocouple wiring was shorted together it would read the temp at that spot.

 

[Thewespaul]

Only power going to the gauge is for the bulb, it just had the + and - from the sensor like you said.

 

[centennial60]

Ok, if disconnecting the t/c wire makes it go to 0 that kinda rules out the gauge in my opinion. I have seen t/c’s that have failed internally fail high.

 

[FordIDIot]

Sounds like your egt probe is shot. That gauge works on mili-volts. My same gauge with a new isspro sender sits at the 50dg mark whenever it's cold.

 

[laserjock]

I would try a different probe. Any type k thermocouple should work.

 

[Thewespaul]

Disconnected the wires no change in gauge reading

 

[Thewespaul]

I would try a different probe. Any type k thermocouple should work.

I’ll try that

 

[laserjock]

Needle may be sticking.

 

[Thewespaul]

Got off the phone with banks tech support, they gave me the ohm specs for testing the gauge and sender and the gauge fails. New banks pyro ordered and on its way. Thanks for the help guys!

 

[nostrokes]

Got off the phone with banks tech support, they gave me the ohm specs for testing the gauge and sender and the gauge fails. New banks pyro ordered and on its way. Thanks for the help guys!

By chance can you post specs and how you tested it??? My gauge flips out, it will read fine for a few minutes, turn the corner and goes to 0. Stays there for a while then jumps to 500-800-200... I will be checking the wires when I have a chance to work on it again and pulling the t/c to look for damage ect.

 

[gnathv]

Nostrokes, when my Guage was acting like yours it was the connection. Had to take connection apart (2 small screws and nuts) they looked fine but using steel wool could see like a coat of scale come off. As stated it is measuring millivolts so it’s very sensitive.

 

[nostrokes]

Good info. I will double check that. Probably throw some electrical grease on them too.

 

[Thewespaul]

That’s what it sounds like to me, I don’t have the specs unfortunately since I was checking on the fly with them on the phone. It sounded like every gauge had very different specs, they needed the model number for my gauge to get the specs.