Hach LANGE EVITA OXY Manuel D'utilisation page 115

Guide to the troubleshooting - single
position transmitter
OXY 4100/3150/4150
Symptom Current signal Error
I = 0 mA
I = 3.80 mA
Constant electric signal
or 24.0 mA
(varying oxygen
concentration)
I = 3.85 mA
or 23.5 mA
I = 3.90 mA
or 23.0 mA
I = 3.95 mA
I = 22.00 mA
Incorrect measurement
Variable
value
Incorrect wiring
Voltage too low
Initialization error
Transmitter defective
Initialization error
Transmitter defective
Membrane damaged
Moisture behind OXY 1100 sensor
Calibration not possible, worn out OXY 1100 sensor
Oxygen content below set measurement range
Oxygen content below set measurement range
Incorrect calibration value
Resolution
Check wiring, and remedy if necessary
Check supply voltage at the transmitter.
Supply voltage must be at least 12 V
1 Switch off transmitter for at least 5 seconds
2 Switch on again with sensor pointing downward
Replace transmitter
1 Switch off transmitter for at least 5 seconds
2 Switch on again with sensor pointing downward
Replace transmitter
Replace OXY 1100 sensor
Fully dry out the terminals on the transmitter. A
hair dryer can be used
Replace OXY 1100 sensor
Reduce lower measurement limit value
Raise upper measurement limit value
1 Check full-scale value in atmospheric air. Hold the
transmitter in the open air with the sensor downward.
Compare the value with DS/EN 25814 (refer to
appendix IIa)
2 Check the zero point (refer to appendix IIb)
3 If significant deviation, calibrate again.
English 115