Hach-Lange 5740 sc - Manual (Page 26)

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Troubleshooting
6.3 Sensor Troubleshooting
Table 5 Sensor Troubleshooting
Problem Cause Resolution
Sensor reading remains at 0 or
max. value for 24 hours or more
Membrane is punctured
Compare reading to measurement obtained by a
hand-held DO sensor. If different, Replace sensor
cartridge.
Call Customer Service.
Cannot calibrate the sensor
Sensor module or sensor
membrane is bad. Replace sensor cartridge. Recalibrate the sensor.
Call Customer Service.