Hach 3654 Portable H2/N2 Analyzer manual Calibration Setup

3654 Portable H2/N2 Analyzer - Calibrations 37 of 66

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.

Fig 4-2:Calibration Setup Diagram

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 4-2above illustrates the calibration setup.

Operator Manual ORBISPHERE