Thermocouple HM4.3 build. Help


 
M

Matthew P

New member
I just finished the HM 4.3. I am having issues with the Thermocouple. It's indicating that it is not connected although it is plugged in. I know the probe works because I have another thermometer that works with it. All other indications are good including the other probe positions. Thanks for the help!!!


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I'm assuming you've gone into the Web UI and have changed the pit probe type to thermocouple?

See if you have 3.3v where the 2 blue arrows point.

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Hi,

I have just built my first HM (V4.3). I did have it set up with 4 probes but have replaced the pit probe with a Thermocouple jack and added the surface mount components. I also removed the 10k resistor. It all "works" but my thermocouple reading is really high (400 deg C at room temp so +380 deg C). Can anyone suggest where on the board or some methodology debug it.

I guess for some reason the Thermocouple signal is offset by 0.75 mV?

I have more surface mount components coming so I can replace what is inselled now. in case I damaged something during the soldering. It was my first attempt at surface mount soldering so it's not pretty. I haven't got any shorts and all seems to be connected up correctly based on the Build info so I am a bit lost on the source of the offset.

Any help would be appreciated. If I wanted to go back to a probe jack do I have to remove all the surface mount components?

Cheers

Jeff
 
You should really start your own thread for your own topic / issue. It sounds like you didn't set the configuration in the Web interface for Probe 0 from Internal to Thermocouple.

If you did, then give the whole TC amp area and SMD parts a good scrub with a toothbrush and 99% isopropyl alcohol.
 
Hi Steve,

Thanks for the info. I have got probe 0 set to Thermocouple and the configuration is the default 5mV/C with 0 offset. I will give it a scrub as you suggest.

Jeff
 
Hi Steve,

Just for completeness cleaning the surface mount component amp and board fixed my issue. I was a bit surprised but relived Thank you very much.

Jeff
 
Jeff Calam said:
Hi Steve,

Just for completeness cleaning the surface mount component amp and board fixed my issue. I was a bit surprised but relived Thank you very much.

Jeff
Click to expand...

You'll find that Steve_M and RalphTrimble, and of course, Cap'n Bry can answer most of your questions here on the forum. Glad to see you got it going. Now, get some meat on the smoker and let us know how it turns out
 
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