Hach-Lange ORBISPHERE A1100 Family - Manual (Page 31)

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Section 5 Maintenance and Troubleshooting
5.1 Maintenance
5.1.1 Maintenance schedule
The following table shows the recommended schedule for membrane replacement. The table
should only be used as a guideline, as maintenance intervals will vary depending on a number
of different parameters (e.g. water chemistry, CIP frequency, oxygen levels, sample
temperature, etc.).
5.1.2 Prerequisites for sensor maintenance
The following table lists the prerequisites for a sensor maintenance:
Important Note: If the sensor is being used in a high level hydrogen sample, this cleaning and
regeneration center is not required. In all other cases it is a prerequisite.
The ORBISPHERE 32301 (illustrated below) is a very efficient cleaning and regeneration tool
for electrochemical sensors. This tool reverses the electrochemical process that is taking place
in the sensor cell during normal operation. This removes oxidation and at the same time
regenerates the surface of the electrodes. In addition, the regeneration center offers a continuity
tester for checking the sensor electronics.
Table 5 Maintenance schedule
Application Membrane type
Membrane
replacement
Water applications (> 10ppb) 2956A Every 3 to 6 months
Pure water applications (power and electronics < 10 ppb) 2956A Every 3 to 6 months
Beer in-line 2952A Every 3 to 6 months
Wort in-line 29552A or 2995A Every 1 or 2 months
Portable or lab applications 2952A or 2958A Every 3 to 6 months
Table 6 Prerequisites for sensor maintenance
Part No. Description
2959 Electrolyte for oxygen sensors, 50 ml. bottle.
29781 Cathode polishing powder (part no.29331) and cloth (part no. 2934).
32301 Electrochemical cleaning and regeneration center (see below)
40089 Tweezers, for maintenance kits
DG33303 Cleaning tool for sensor polishing