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Portable Trace Oxygen Analyzer | Installation |
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2.4 Calibration
Calibration involves using a span gas to set the span of the instrument. The proper span gas concentration depends on the range that the instrument will be used on. The correct concentration should be 80- 90% of the range used. For instance, if the analyzer is to be used on a range of
2.4.1 Calibration Procedure for Trace Analysis
To calibrate the Model 3110, the instrument must be fitted with a trace sensor. The instrument must also be purged overnight using a zero gas (a pure gas with no oxygen, typically O2 free N2) before calibrating. For
To calibrate the analyzer for trace analysis:
1.Purge the analyzer overnight.
2.Purge the calibration gas sample line, regulator, and control valve. See Section 2.4.3.
3.Set the calibration gas flow rate to 1 SCFH.
4.Attach the vent line followed by the span gas line using the quick disconnect fittings.
5.Navigate to the SPAN VALUE screen (see Section 3.2.13) and set the span value to the known oxygen concentration in ppm of the span gas.
6.Observe the oxygen reading on the screen to determine when the reading has stabilized.
7.Navigate to the SPAN screen and select SPAN: START.
8.When the screen changes and displays SPAN: FINISH, select
SPAN: FINISH to set the span.
9.Allow the span gas to flow for several minutes to verify the proper span setting.
10.Calibration is complete. Remove the span gas line first followed by the vent line.
Teledyne Analytical Instruments | 21 |