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PID thermocouple and FS accuracy

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oxonbrew

Active Member
Joined
Dec 10, 2012
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Hi All,

I've recently bought a sestos PID with the aim of upgrading my brewing system to a herms type system.

When reading the PID instructions I see that the accuracy of the PID is quoted as "Indication and control accuracy 0.1℃, ±0.2%FS ".

My question is what does this mean???

My understanding is that it says the PID reports back in 0.1C increments and 0.2%FS is 0.2% of the full scale accuracy.

If I use a k-type thermocouple the scale is -50 to 1350C i.e. 1400C full scale. So the accuracy is 0.2% x 1400C = +/-2.8C - this seems bad??? Is this an offset that doesn't change is is it really saying that my reading is within 6C ?

If I used a CU50 the range is -50 to 150C and the accuracy is +/- 0.4C

Or a PT100 -200 to 600 so an accuracy of +/- 1.6C

So should I use CU50 ?? or have I misunderstood ????

Cheers!
 
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