Analytical Industries GPR-2000 ATEX Portable Oxygen Analyzer - Manual (Page 26)

Advanced Instruments Inc.
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6 Maintenance
With exception of components related to optional equipment and charging the battery of portable analyzers, cleaning the
electrical contacts when replacing the sensor is the extent of the maintenance requirements of this analyzer as there are no
serviceable parts in the analyzer given the nature of the solid state electronics and sensor.
Serviceability: Except for replacing the oxygen sensor, there are no parts inside the analyzer for the operator to service. Only
trained personnel with the authorization of their supervisor should conduct maintenance.
Sensor Replacement
Periodically, the oxygen sensor will require replacement. The operating life is determined by a
number of factors that are influenced by the user and therefore difficult to predict. The
specification defines the normal operating conditions and expected life of the sensors utilized
by this analyzer. Expected sensor life is inversely proportional to changes in oxygen
concentration, pressure and temperature. Section 5 Operation describes the sensor’s operating
characteristics and section 8 Troubleshooting addresses both common operating errors,
corrective action and the sensor’s actual mode of failure.
Caution: DO NOT open the oxygen sensor. The sensor contains a corrosive liquid electrolyte
that could be harmful if touched or ingested, refer to the Material Safety Data Sheet contained
in the Owner’s Manual. Avoid contact with any liquid or crystal type powder in or around the
sensor or sensor housing, as either could be a form of electrolyte. Leaking sensors should be
disposed of in accordance with local regulations.
Procedure:
1. Remove the four (4) screws securing the analyzer’s front panel.
2. Caution: Do not discard the gaskets from the enclosure.
3. Disconnect and remove the male phone plug from the male receptacle attached to the
sensor.
4. Unscrew the old sensor from the flow housing.
5. Open the barrier bag containing the new sensor.
6. If the sensor is equipped with a shorting loop, remove the shorting wire from the pins of
the female socket attached to the new sensor.
7. Screw the new sensor, finger tight plus ¼ turn, into the threaded hole in the flow housing
and ensure the o-ring seal is engaged.
8. Push the male phone plug into the male receptacle attached to the new sensor.
9. Caution: Replace the analyzer’s front cover of the analyzer and ensure that the gasket is
replaced – failure to do so will void the CE approval and NEMA 4 rating.
10. Tighten the four (4) screws to secure the front cover.
11. Calibrate the analyzer as described in section 5 Operation.
Battery
Charging the battery requires a common 9VDC adapter (positive pole located inside the female
connector) supplied with the analyzer and a convenience outlet. The analyzer’s charging circuit accepts 9VDC from any standard
AC 110V or 220V adapter. The electronic design enables the analyzer to remain fully operable during the 8-10 hour charging
cycle.
Procedure:
1. Turn the analyzer OFF when charging the battery for the shortest charging cycle.
2. Connect the appropriate 9VDC adapter supplied with the analyzer to a 110V or 220V outlet.
3. Insert the male phone plug from the 9VDC adapter into the integral female CHARGE jack located on the enclosure.
4. Caution: The analyzer is designed to operate in the charging mode, however, operating the analyzer in hazardous or
explosive atmospheres while charging the battery IS NOT recommended.
Service: A single charge is sufficient to operate the GPR-2000 Series analyzers continuously for a period of 60 days. Expect 8-
10 hours of service if the integral sampling pump of the GPR-2000P Series analyzer is operated continuously.