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By touching each of the electrode surfaces very carefully in turn with one ohmmeter lead and the
corresponding pin with the other, as follows:
• central electrode and pin 4
• outer electrode and pin 9
• guard electrode and pin 1
You should find a value of zero in each case. A discrepancy in any of the above checks suggests a
connection fault within the sensor and should be reported to your Hach Lange representative.
Be careful not to scratch the electrode surfaces.
5.2.4 Resistance tables
The following tables show the resistance between the sensor LEMO plug pins. All values are in kilo
ohms.
All sensors:
Sensor Model
31110, 31120, 31123, 31130, 31131, 31140, 31141,
31230, 31240, 31330, GA2x00, C1100
31111, 31122, 31132, 31231, 31332,
A discrepancy greater than ±1% indicates a probable fault in the circuit.
12 English
C A U T I O N
31121
31331
Pins
0°C
10°C
3-6
351.0
207.9
126.7
2-5
7-8
351.0
207.9
126.7
3-6
2-5
351.0
207.9
126.7
7-8
351.0
207.9
126.7
3-6
95.0
58.8
3-10
19.6
11.9
2-5
351.0
207.9
126.7
7-8
20°C
25°C
30°C 40°C
100.0
79.4
51.0
100.0
79.4
51.0
100.0
79.4
51.0
100.0
79.4
51.0
37.3
30.0
24.3
16.2
7.49
6.00
4.83
3.19
100.0
79.4
51.0
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