wtw inoLab pH/ION Level 2 Operating Manual page 66

What to do if...
Concentration dis-
play flashes
TP flashes
Temp Error
Calibration
Std 2 flashes
150
Cause
During measurement:
– Measured value is outside
the range determined by
calibration
During calibration:
≤
U2 U1
–
≤
U3 U2 –
Cause
During calibration:
– Calibration standards
have the wrong
temperature (maximum
temperature difference
2 °C)
±
During measurement:
– Test sample has the
wrong temperature
(maximum temperature
difference 2 °C)
±
Cause
– Standard 2 = Standard 1
Remedy
– Select calibration
standards bracketing the
measured value
– Calibration standards are
too close together. Select
5mV
other calibration
5mV
standards
Remedy
– Temper the calibration
standards
– Temper the test sample
Remedy
– Use different calibration
standards