Hach-Lange EVITA OXY User Manual - Manual (Page 33)

31
Calibration
EVITA ® OXY sensors must be calibrated in
atmospheric air. Calibration every 6 months is
recommended. Calibration can be initiated from the
USC 5000/6000/7000 or by using the TILTCAL
®
feature in the OXY transmitter. During calibration,
the OXY 1100 sensor must not be exposed to direct
sunlight.
Using TILTCAL ®
Hold the transmitter with the OXY 1100 sensor
upwards to initiate calibration by activating the tilt
switch. After 5 min. turn the transmitter with the OXY
1100 sensor downwards and the transmitter has
completed the calibration routine. During calibration,
the current output signal is factory set to 4 mA.
Optional 20 mA or the last measured value (Hold)
can be chosen via the USC 5000/6000/7000.
Fig. 40
Before calibration, the OXY 1100 sensor must
be cleaned, see section “Maintenance”. With fast
calibration in atmospheric air a 1% system accuracy
can be obtained. Temperature and barometric
pressure compensation is made automatically
during calibration via an internal temperature and
pressure sensor.
Tilted Not tilted
TILTCAL ®