Analytical Industries GPR-2500 S Oxygen Analyzer - Manual (Page 17)

17
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. Tygon tubing measuring 4-6 ft. in length.
¾ Suitable fittings and 1/8” dia. Tygon tubing to connect the regulator to the flow meter inlet
¾ Suitable fitting and 1/8” dia. Tygon tubing to connect from the flow meter vent to Item FITN-1029 Connector,
Barbed Tubing attached to Item A-2344 Flow Through Adapter.
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.
9. Set the flow rate to approximately 2 SCFH or 1 liter per minute.
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.
10. Proceed to Span Calibration section.
Calibration Gas Connections – Integral and Remote Sensor:
1. Caution: Do not change the factory setting until instructed to do in this manual.
2. Review the illustration below and locate Item A-2344 Calibration Flow Through Adapter and the installed Item
FITN-1029 Connector, Barbed Tubing.