Analytical Industries GPR-2000 ATEX Portable Oxygen Analyzer - Manual (Page 13)

Advanced Instruments Inc.
13
Installing the Oxygen Sensor
GPR-2000 Series Portable Oxygen Analyzers are equipped with an integral oxygen sensor. They are fully operational from the
shipping container with the oxygen sensor installed, tested and calibrated by the manufacturer prior to shipment. Should it be
necessary to install the oxygen sensor – see section 6 Maintenance which covers replacing the oxygen sensor.
Caution: All analyzers must be calibrated once the installation has been completed and periodically thereafter as described
below.
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 in section 10. 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.
Span Gas Preparation
Caution: Do not contaminate the span gas cylinder when connecting the regulator. Bleed the air filled regulator (faster and
more reliable than simply flowing the span gas) before attempting the initial calibration of the instrument.
Required components:
¾ Certified span gas cylinder with an oxygen concentration, balance nitrogen, approximating 80% of the full scale range
above the intended measuring range.
¾ Regulator to reduce pressure to between 5 and 30 psig.
¾ Flow meter to set the flow between 1-5 SCFH,
¾ 2 lengths of 1/8” dia. metal tubing measuring 4-6 ft. in length.
¾ Suitable fittings and 1/8” dia. metal tubing to connect the regulator to the flow meter inlet
¾ Suitable fitting and 1/8” or ¼” dia. metal tubing to connect from the flow meter vent to tube fitting designated SAMPLE IN.
Procedure:
1. With the span gas cylinder valve closed, install the regulator on the cylinder.
2. Open the regulator’s exit valve and partially open the pressure regulator’s control knob.
3. Open slightly the cylinder valve.
4. Loosen the nut connecting the regulator to the cylinder and bleed the pressure regulator.
5. Retighten the nut connecting the regulator to the cylinder
6. Adjust the regulator exit valve and slowly bleed the pressure regulator.
7. Open the cylinder valve completely.
8. Set the pressure between 5-30 psig using the pressure regulator’s control knob.
Caution: Do not exceed the recommended flow rate. Excessive flow rate could cause the backpressure on the sensor and may
result in erroneous readings and permanent damage to the sensor.