STC-1000 minus temp reading

[MickJ]

Help required from electrical or electronic people........

Have just received my temperature probes to use with my STC-1000 controller in my beer fermenter and another for my Reflux Boka build with it's own Digital Thermometer meter...............

Tested it and it is giving a minus reading...
With the original senser that came with the STC-1000 the test pot of water is 26*c and as it's set to 10*c the cooling light came on.......
Swapped the two wires around still 26*c ( there is no + or – with a probe but tested it anyway)
Fit my new probe and get a minus temp ( tested both new probes and get same minus reading)
-26*c and heater light came on........

So may be it's not a NTC probe could it be a K Type probe.....
Borrowed a K temp probe and it reads OK as the original did in the STC-1000
Was then told NTC only go up to a few 100 degrees and K up to 1,000......

So does any one know what may be wrong ….

Thanks
Michael




STC-1000

http://www.ebay.com.au/itm/New-Mini-220 ... 1e91eccc15


NTC temperature probe arrived and tested today with STC-1000

http://www.ebay.com.au/itm/311091316905 ... EBIDX%3AIT


NTC Digital Thermometer ...it's in the post

http://www.ebay.com.au/itm/251152582260 ... EBIDX%3AIT

[brad81]

Do you have a manual?

stc1000_operating_manual.pdf

No experience with probes other than what came with the kit mate, sorry.

[Barridale]

If the wires on the new probe are a different length to the original probe you will get a false reading, as the resistance level has changed to something different to that which it was calibrated to.
Besides that NTC probes are not suitable for use with the stc 1000, neither are k types as far as I know. They are designed for PIDs.
You are better off sticking with the original probe and using a thermowell.

[MickJ]

Think i know what is wrong............... :violence-smack: :violence-smack: :violence-smack:

The STC-1000 is a 10 K ohm and the probe is NTC 100 K ohm

What i want to do is remove the probe from the fermenter or the boiler to clean it...........
But also have a probe that is testing further in from the side of the fermenter/boiler most Ebay probes are only about 25mm long...........
So 25mm is OK for the boiler and the Digital Thermometer comes with a probe but need to see it to work out how to fit/seal it..........
The way to go is sticking with the original probe and using a thermowell in the fementer............