Advanced Instruments Inc.
20
Installing the Oxygen Sensor
Analyzers are equipped with an integral oxygen sensor that is tested and
calibrated by the manufacturer prior to shipment and is fully operational from the
shipping container. Analyzers must be calibrated once the installation has been
completed and periodically thereafter as described below. Should it be necessary
to install the oxygen sensor – refer to section 6 Maintenance which covers
replacing the oxygen sensor.
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, recommended 30 psig.
¾ Flow meter to set the flow to 2 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” dia. metal tubing to connect from the flow meter vent to tube fitting designated SAMPLE IN on the
GPR-18 gas panel.
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.
(26 pages)
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