What does the error message 'FAC' mean on the MP series meters?

Document ID

Document ID TE7371

Version

Version 3.0

Status

Status Published

Published Date

Published Date 03/20/2018
Question
What does the error message 'FAC' mean on the MP series meters?
Summary
Meaning of FAC error message on MP meters
Answer
The MP Series meters have built in calibration limits. A nominal "FAC" value is an ideal value stored by the factory. Attempts to calibrate too far (± 10% or ± 1 pH unit) from this value causes the displayed value to be replaced with "FAC". If the CAL/MCLR key is pushed, the value is accepted, and the original default factory calibration for this measurement is shown. The need to calibrate so far out that "FAC" appears indicates a procedural problem, incorrect standard solution, a very dirty cell cup, or an aging pH/ORP sensor.

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