Analytical Industries GPR-3100 Series Oxygen Purity Analyzer - Manual (Page 21)

Advanced Instruments Inc.
5 Operation
GPR-3100 Rev 2/05 14
Installing Span Gas
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 Span gas cylinder with an oxygen concentration described in the Calibration section below.
¾ Regulator to reduce pressure to between 5 and 30 psig.
¾ Flowmeter to set the flow to 2 SCFH,
¾ Suitable male union connector to connect the regulator to the Flowmeter.
¾ Fitting, preferably with barbed and male NPT connections, to connect the flowmeter vent to one end
of the plastic Tygon tubing.
¾ 4-6 feet of 1/8” diameter metal tubing.
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.