Hach ORBISPHERE GA2X00 O2 EC Manuel D'utilisation De Base page 14

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 for A110X and C1100 sensors only
DG33629 Cleaning tool for sensor polishing for GA2X00 sensors only
DG33619 Regeneration Cell for GA2X00/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 is a very efficient cleaning and regeneration tool for electrochemical
sensors. Refer to Figure
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.
Figure 2 ORBISPHERE 32301 cleaning and regeneration tool
5.3 Membrane replacement and sensor head cleaning
Chemical exposure hazard. Obey laboratory safety procedures and wear all of the
personal protective equipment appropriate to the chemicals that are handled. Refer to
the current safety data sheets (MSDS/SDS) for safety protocols.
A sensor recharge kit is required as it contains all the components necessary for this membrane
replacement and sensor head cleaning process. Refer to
Note: It is advisable to perform this procedure with the plastic sensor base installed so as to avoid any damage to
the connection socket and also to provide a suitable stand for the sensor when required.
1. Hold the main body of the sensor and unscrew the protection cap locking washer by turning
counter-clockwise. Remove it from the sensor and put to one side.
2. Pull/twist off the protection cap and put to one side. If you are using a protection cap with a grille,
then remove the Dacron
3. Hold the sensor with the membrane facing down to avoid spilling any electrolyte, then carefully
unscrew the old cartridge. Drain the old electrolyte into a sink and flush away. Discard the old
cartridge and membrane. Remove the cotton washer and silicone disc from the top of the anode
and discard.
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2. This tool reverses the electrochemical process that is taking place in the
C A U T I O N
®
mesh from inside the cap and discard it.
Sensor recharge kit on page 8.