Thermo Scientific AquaSensors
™
AnalogPlus
™
Dissolved Oxygen Sensor (ppm) User Guide
23
4.3.
Dissolved Oxygen Sensor Troubleshooting
General Inspection
If the sensor is not providing reasonable signals to the analyzer, check the following:
1.
Inspect the integrity of the membrane. If the membrane is torn or punctured, replace it a new membrane
cap and fresh electrolyte (see section 4.2).
2.
Inspect the sensor cable for damage to the outer jacket. Any cuts or kinks may damage signal
connections.
3.
Inspect terminal block connections to be sure wires are not corroded or loose.
4.
Make sure all sensor wires are connected to the correct places on the analyzer terminal block. Depending
on the analyzer.
5.
The sensor should be immersed in a solution of known D.O. value.
6.
Establish that the analyzer electronics are working correctly by verifying operation with another sensor.
Note: Any new sensor that has been in storage for more than a few days should be soaked
in tap water for at least 30 minutes before reviewing measurement performance.
Note: The membrane of any Dissolved Oxygen sensor in storage must be kept moist at all
times. Protective caps should be filled with Thermo Scientific AquaSensors storage solution
for best performance. The protective cap should be placed securely over the sensor head.
