Maintenance Schedule - Hach ORBISPHERE Manual Básico Del Usuario

Sensor removal
• Shut off the sample flow and drain the sampling circuit of liquid or gas.
• Remove the sensor cable connected at the sensor end.
• Hold the sensor body in one hand to avoid rotation and unscrew the collar with the other hand.
• Pull the sensor straight out of the socket or flow chamber.
• Check that both O-rings remain in place inside the flow chambers.
• Install the sensor storage cap and sensor base (to protect the connection).
Maintenance

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.).
Application
Water applications (> 10ppb)
Pure water applications (power and electronics < 10 ppb)
Beer in-line
Portable or lab applications
Wort in-line
Prerequisites for sensor maintenance
The following table lists the prerequisites for a 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
DG33619 Regeneration Cell for A1100 or C1100 sensors
DG33620 Orbisphere EC sensor support for cleaning
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.
Membrane type Membrane replacement
2956A Every 3 to 6 months
2956A Every 3 to 6 months
2952A Every 3 to 6 months
2952A or 2958A Every 3 to 6 months
29552A or 2995A Every 1 or 2 months
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