Troubleshooting; Ozone Sensor - Hach LANGE ORBISPHERE C1100 User Manual

Maintenance and Troubleshooting

5.2 Troubleshooting

5.2.1 Ozone sensor

When the O
the sensor has to settle down for up to 24 hours when used in very low O
conditions.
Sensor won't calibrate, even after
cleaning and/or membrane
change.
"0000" O
Unexpected/incorrect dissolved
O reading.
3
32
sensor has been properly calibrated using the Orbisphere measuring instrument,
3
Table 2 Troubleshooting - Ozone sensor
Problem
levels displayed.
3
Probable Cause
Instrument internal barometric
pressure sensor needs
calibration.
Wet membrane interface.
Wrong reading scale "XXXX"
selected for display unit.
High residual current.
Insufficient flow rate.
Length of sample line allows O
time to react.
Doesn't match lab samples.
concentration
3
Possible Solution
Calibrate internal barometer
against a certified barometer.
Do not correct for sea level !
Wipe dry with a tissue and
re-calibrate.
Change reading scale by
selecting "X.XXX, XX.XX or
XXX.X".
If concentration is significantly
higher than low limit, try a sensor
service.
Regulate flow equivalent to
membrane specified levels.
3
Reduce length of sample tubing.
Take samples at close proximity
to sensor.