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Saturday, February 20, 2016

[appliance-repair] Digest Number 2454

2 Messages

Digest #2454

Messages

Fri Feb 19, 2016 8:35 am (PST) . Posted by:

rhkramer03

I bought a cheap Chinese digital temperature controller:

MH1210F Digital Temperature Control Controller Thermostat 110V -58℉~194℉ Delay
w/Sensor

You can see the "manual" at:

www.szmeihang.com/uploadfile/201401/20140116231623558.pdf

I bought it to serve as a thermostat in a (homebuilt) combination smoker /
fermentation "cabinet".

Initially I used it to control the temperature to about 70℉ (with the cabinet
in my basement) to ferment sauerkraut. It worked fine.

Recently, I tried to control the temperature to 170℉ to smoke some pork ribs.
It did not work properly in that, at 163℉, the temperature on the display
abruptly jumped to 32.1℉. Because of that, the thermostat would no longer
control the heat to 170℉, but instead tried to continue to drive the
temperature from that 32.1℉ back up to 170℉ (well, really 163℉).

Aside: Fortunately (or not), the heating element I use is fairly low wattage
(400 watts) and would not take the temperature up beyond about 58℉ on the
"revised" attempt to control to 170℉. I do plan on adding more insulation on
the outside of the cabinet to achieve the required temperature with less
energy used.

I've tried writing to the people I bought the unit from and tried searching
the Internet, but so far have found no help.

I believe the temperature sensor is an RTD device, specified as NTC 25 degrees
C = 10K B3435 +/-1% with 1 meter leads.

Does anyone have any experience with this temperature controller or hints of
any sort.

One thing I didn't think to do was measure the resistance (with an ohmmeter)
around the time the display changed from 163℉ to 32.1℉ degrees. I may try
that experiment sometime soon (without ribs ;-), but if there are other
suggestions for tests I'd like to do them at the same time.

Thanks!
Randy Kramer

Fri Feb 19, 2016 8:42 am (PST) . Posted by:

rhkramer03

Update: Oops, I guess the manual I linked to (below) is for the MH1210A which
has a control range of from -50 to 110 degrees C. The significant difference to
the MH1210F is the control range, which, as stated below is -58℉~194℉. ATM, I
can't find the manual for the MH1210F.

On Friday, February 19, 2016 11:35:44 AM rhkramer@gmail.com wrote:
> I bought a cheap Chinese digital temperature controller:
>
> MH1210F Digital Temperature Control Controller Thermostat 110V -58℉~194℉
> Delay w/Sensor
>
> You can see the "manual" at:
>
> www.szmeihang.com/uploadfile/201401/20140116231623558.pdf
>
> I bought it to serve as a thermostat in a (homebuilt) combination smoker /
> fermentation "cabinet".
>
> Initially I used it to control the temperature to about 70℉ (with the
> cabinet in my basement) to ferment sauerkraut. It worked fine.
>
> Recently, I tried to control the temperature to 170℉ to smoke some pork
> ribs. It did not work properly in that, at 163℉, the temperature on the
> display abruptly jumped to 32.1℉. Because of that, the thermostat would
> no longer control the heat to 170℉, but instead tried to continue to drive
> the temperature from that 32.1℉ back up to 170℉ (well, really 163℉).
>
> Aside: Fortunately (or not), the heating element I use is fairly low
> wattage (400 watts) and would not take the temperature up beyond about 58℉
> on the "revised" attempt to control to 170℉. I do plan on adding more
> insulation on the outside of the cabinet to achieve the required
> temperature with less energy used.
>
> I've tried writing to the people I bought the unit from and tried searching
> the Internet, but so far have found no help.
>
> I believe the temperature sensor is an RTD device, specified as NTC 25
> degrees C = 10K B3435 +/-1% with 1 meter leads.
>
> Does anyone have any experience with this temperature controller or hints
> of any sort.
>
> One thing I didn't think to do was measure the resistance (with an
> ohmmeter) around the time the display changed from 163℉ to 32.1℉ degrees.
> I may try that experiment sometime soon (without ribs ;-), but if there
> are other suggestions for tests I'd like to do them at the same time.
>
> Thanks!
> Randy Kramer

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