I thought it was just my cooking... everything was getting burnt.
Checked temp with digital meter probe and found my 3 yr old Stoves
electric oven was giving over 200C when set to 160, but 140 was really
140 - so scale a bit off! Wanted to fix it, but local electrical
supplier claims cannot get a replacement domestic thermostat rated at
better than +-10%. Confirms my suspicions - replaced thermostat on a
previous (Belling) some years ago, and accuracy was not greatly
improved. (And it was a fiddly job too) Any suggestions out there for
a better solution than +-20 degrees at 200? Sounds like life hasn't
moved on much since the bimetallic strip... anybody put a more
sophisticated electronic control circuit in?
RS sell several useful controllers and probes, we've got several ovens
at work in the labs and all have eurotherm units, a basic controller
should be ok, full PID control is too much for too little return in a
domestic oven. As for Bellend, just don't go there, still owed my
holiday and overtime from when they went to the wall when Mr's Belling
died....Still I didn't have a pension with them, thankfully.
Niel, former Bellend engineer.
On 29 Dec 2003 17:04:48 -0800, firstname.lastname@example.org (rjc_csl)
If you can bypass the current thermostat then a programmable thermo
regulator, 24V supply and K type thermocouple may work. Setting the
temperature would be a fairly simple but deciding on the hysteresis
may need a bit of experimentation.
I have no idea of the cost of the power supply but imagine a
transformer and 4 diodes would work, the thermocouple will be about
GBP15 and the thermo regulator about GBP50.
> I have no idea of the cost of the power supply but imagine a
It's not just the method, but also where the probe is placed...
Our fan oven has electronic temperature control, I haven't taken it
apart to see whether it's thermocouple or thermister and I'm too lazy to
check it with a thermometer. So I can't vouch for its accuracy ;)
It was cheap though, so the electronics must be as well...
| I thought it was just my cooking... everything was getting
| burnt. Checked temp with digital meter probe and found my
| 3 yr old Stoves electric oven was giving over 200C when set
| to 160, but 140 was really 140 - so scale a bit off!
I knew someone who had a somewhat strange 1970s-esque arrangement where the
oven was under the worktop but the controls were on a wall-mounted
grill/rosisserie unit. He was tidying up the kitchen and coming across a
bare copper wire from the oven to the grill cut it out and replaced it with
some proper green-and-yellow earth cable.
It wasn't so much burnt food that alarmed him but more the constantly
melting of the plastic containers used for ready meals. I think some
complaints to the retailer actually produced some free replacements.
Some readers by this point will have a suspicion that what appeared to be a
bare copper earth wire was in fact the temperature sensor wire ...
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