Hach-Lange EVITA OXY User Manual - Manual (Page 44)

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Symptom Current signal Fault Remedy
Constant current signal
(varying oxygen concentration) I = 0 mA Incorrect wiring Check wiring and make the necessary corrections.
Undervoltage Check the supply voltage at transmitter.
Supply voltage must be at least 12 V.
Initialisation fault 1. Switch off transmitter for min. 5 seconds.
2. Switch on again while sensor points downwards.
Transmitter defective Replace transmitter
I = 3.80 mA or
24.0 mA Initialisation fault 1. Switch off transmitter for min. 5 seconds.
2. Switch on again while sensor points downwards.
Transmitter defective Replace transmitter
I = 3.85 mA or
23.5 mA Membrane leakage Replace OXY 1100 sensor.
Moisture behind OXY 1100 sensor Fully dry the terminals at transmitter.
A hair dryer might be of assistance.
I = 3.90 mA or
23.0 mA Calibration not possible, worn OXY 1100 sensor Replace OXY 1100 sensor.
I = 3.95 mA Oxygen under set measuring range Set the lower measuring limit to a lower value.
I = 22.00 mA Oxygen level higher than set measuring range Set the upper measuring limit to a higher value.
Error in measuring value Variable Calibration value incorrect 1. Check FSO in atmospheric air. Hold the transmitter up in
the air with the sensor downwards. Check value against
DS/EN 25814 (see appendix IIa)
2. Check zero point (see appendix IIb)
3. In the case of large reading error, recalibrate.
Troubleshooting guide - OXY 4100/3150/4150 stand alone transmitter