Sensor Drift

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Thread Starter

EagerLearner

why does a newly installed pH sensor show drift in the reading even after the equipment was troubleshoot according to the instructions/maintenance procedure and recalibrated.

What other cause of this drift is possible?
 
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> why does a newly installed pH sensor show drift in the reading even after the
> equipment was troubleshoot according to the instructions/maintenance procedure
> and recalibrated.

hard to say? can you get any lab results to compare the readings to? It could actually be a variable process PH, have you confirmed this?
 
Some transmitters have MTC (manual temperature compensation) enabled and hard set at a certain temperature.

The temperature increase/decrease affects the pH reading.

Some of the more cost effective pH probes out there does not have a pt100 temperature sensor built in. And some transmitters that do have ATC (automatic temp compensation) require you to install an external RTD.

Hope it helps

> why does a newly installed pH sensor show drift in the reading even after the equipment
> was troubleshoot according to the instructions/maintenance procedure and recalibrated.
 
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