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3654 Portable H2/N2 Analyzer - Calibrations 37 of 66
Operator Manual
ORBISPHERE
4.2.1 Calibration Setup
Ensure that the purge gas is flowing at the recommended rate through the sensor by
placing the purge gas exit tubing into water. This rate should be more than four bubbles
during the purge which lasts for 4 seconds.
This purge cycle is repeated every 20 seconds.
The calibration procedure requires a source of pure gas (regulated by a pressure valve)
connected to the central entry port of the flow chamber, an accurate pressure gauge
(better than
± 2%) at the exit of the flow chamber, a needle valve to control the flow on
exit, and a beaker of water to monitor the gas flow. Fig 4-2 above illustrates the
calibration setup.
Fig 4-2:
Calibration Setup Diagram