Xylem WQL-pH pH DATALOGGERS - Manual (Page 67)

WQL-pH What to do if...
141 ba75821e01 10/2009
12 What to do if...
12.1 Calibration and measuring
Lengthy stability
check with
AutoRead
Implausible
measured values
Logger does not
react
System cannot be
calibrated
Cause Remedy
No stable measured value Provide stable measuring conditions
(e.g. temperature)
Cause Remedy
– Electrode not installed or
defective
– Check electrode and electrode
connection
– No calibration performed – Calibrate
– Watering cap still on the
electrode
– Pull off watering cap and calibrate
– Electrode contaminated – Clean electrode
– Liquid penetrated into the plug
connector
– Rinse the plug connector with
deionized water, clean and dry it
Cause Remedy
– Battery depleted – Insert new battery (see
section 11.4)
Cause Remedy
– Slope of the electrode not within
tolerance (see section 5.3)
– Condition the electrode
– If the slope is still outside the
tolerance, replace the electrode
– Check the buffer solutions
– Slope of the electrode too low – Replace electrode
– Asymmetry of the electrode too
high
– Replace electrode