Maintenance Schedule - Hach Polymetron 8350.3 Manuel De L'utilisateur

4.2 Maintenance schedule

The maintenance schedule shows minimum times for regular maintenance tasks. Perform
maintenance tasks more frequently for applications that cause electrode fouling.
Maintenance task
Clean the sensor
Inspect sensor for damage
Calibrate sensor
4.3 Clean the sensor
Chemical hazard. Always wear personal safety protection in accordance with the Material Safety
Data Sheet for the chemical that is used.
Personal injury hazard. Removal of a sensor from a pressurized vessel can be dangerous. Reduce
the process pressure to below 10 psi before removal. If this is not possible, use extreme caution.
Refer to the documentation supplied with the mounting hardware for more information.
Pre-requisite: Prepare a mild soap solution with a non-abrasive dishwashing detergent that does not
contain lanolin. Lanolin leaves a film on the electrode surface that can degrade the sensor
performance.
Examine the sensor periodically for debris and deposits. Clean the sensor when there is a buildup of
deposits or when performance has degraded.
1. Use a clean, soft cloth to remove loose debris from the end of the sensor. Rinse the sensor with
clean, warm water.
2. Soak the sensor for 2 to 3 minutes in a soap solution.
3. Use a soft bristle brush to scrub the entire measuring end of the sensor.
4. If debris remains, soak the measuring end of the sensor in a dilute acid solution such as < 5%
HCl for a maximum of 5 minutes.
5. Rinse the sensor with water and then return to the soap solution for 2 to 3 minutes.
6. Rinse the sensor with clean water.
Always calibrate the sensor after maintenance procedures.
Section 5 Replacement parts and accessories
Note: Product and Article numbers may vary for some selling regions. Contact the appropriate distributor or refer to
the company website for contact information.
Description
Combination pH sensor for hydrofluoric acid environments with integrated
temperature sensor.
Combination pH sensor for high temperatures with protected sensor,
impedance control and integrated temperature sensor.
Combination pH sensor for waste water environments incorporating a
protected, flat sensor, impedance control and integrated temperature
sensor.
90 days
X
X
Set by regulatory agencies or experience
W A R N I N G
W A R N I N G
Annually
Item no.
08350=C=0003
08350=C=0004
08350=C=0005
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