Hach-lange ORBISPHERE 31xxx Installation and Maintenance Manuel d'utilisateur télécharger pdf (Page 38)

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Troubleshooting

6.3 Ozone sensor

When the O

3

sensor has been properly calibrated using the ORBISPHERE measuring

instrument, the sensor has to settle down for up to 24 hours when used in very low O

3

concentration conditions.

Table 10 Troubleshooting - Ozone sensor

Problem Probable Cause Possible Solution

Sensor won't calibrate,

even after thorough

servicing.

Repeated calibrations go beyond

"expected limits" of instrument.

MOCA 3600 only:

Select membrane from

"Options/Membrane" menu. Then,

calibrate the sensor.

O

3

sensor cleaned with HNO

3

Instrument internal barometric

pressure sensor needs

calibration.

Calibrate "Barom. Pressure" menu.

Check against a certified barometer. Do

not correct for sea level !

Wet membrane interface. Wipe dry with a tissue and re-calibrate.

"0000" O

3

levels

displayed.

Wrong reading scale "XXXX"

selected for display unit.

Change reading scale by selecting

"X.XXX, XX.XX or XXX.X" from

"Options/Display Units" menu.

Unexpected/incorrect

dissolved O

3

reading.

High residual current.

If concentration is significantly higher

than low limit, try a sensor service.

Insufficient flow rate.

Regulate flow equivalent to membrane

specified levels.

Length of sample line allows O

3

time to react.

Reduce length of sample tubing.

Doesn't match lab samples.

Take samples at close proximity to

sensor.

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