Hach POLYMETRON 9135 Operator's Manual page 65

Transmitter 9135 – pH/redox measurement
ERROR MESSAGE
10.8
pH
Pt100/Pt1000
SHORT-CIRCUIT
11.4
pH
Pt100/Pt1000
OPEN CIRCUIT
1.4
pH
MEASURE
TOO LOW
13.4
pH
MEASURE
TOO HIGH
10.3
pH
GLASS IMPED.
TOO HIGH
DESCRIPTION/POSSIBLE CAUSE
•
Sensor not correctly connected.
Temperature sensor damaged
Replace it if necessary.
•
Sensor not correctly connected.
Temperature sensor damaged
Replace it if necessary.
•
The pH value is inferior to -3 pH.
•
The pH value is superior to 14 pH.
•
The glass electrode impedance is superior to the
limits set by the user. It is required to :
- change the limits (SERVICE / IMPEDANCES /
GLASS / UPPER) or,
- clean or change the clogged electrode.
Page 61