Hach-Lange EVITA OXY User Manual - Manual (Page 35)

33
Maintenance
Under normal conditions, the OXY 1100 sensor will
operate for 2-3 years and can be replaced in a few
minutes.
General maintenance of the EVITA
® OXY sensor
is limited to cleaning about every 2-3 months and
calibration about every 6 months.
1. Lift the transmitter out of the medium.
2. Clean the sensor with pure water, to which a little
cleaning agent/washing-up liquid can be added.
3. Dry the sensor with a soft cloth.
4. Immerse the transmitter into the medium to be
measured.
Cleaning (OXY transmitter)
During cleaning, the sensor must not be allowed to
remain pointing upwards for more than 3 minutes at
a time if the TILTCAL
® function is enabled, otherwise
a calibration cycle will start. The TILTCAL ® function
can be disabled according to fi g. 48, p. 37.
Replacement of sensor
1. Remove the defective/worn sensor.
2. Insert new sensor (see fi g. 7, p.8 or fi g. 8, p. 9).
3. Reset the lifetime counter (see p. 18 or fi g. 32, p.
22).
4. Place the transmitter so that the OXY 1100
sensor points downwards. Keep it in this position
for at least 1 hour to allow the new sensor to
stabilise (see fi g. 29, p. 18).
5. Perform calibration (see section “Calibration” p.
31-32).
Fig. 42
Cleaning (USC signal converter)
When considered necessary, clean the USC signal
converter using a soft moist cloth.