38 of 66 | Calibrations - 3654 Portable H2/N2 Analyzer |
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4.2.2 Calibration In H2 or N2 at Atmospheric Pressure
The sensor can be calibrated in pure H2 or N2 gas at atmospheric pressure.
WARNING
Handle H2 gas with great care. It is extremely flammable and explosive.
To ensure that the flow chamber and sensor components are dry, remove and blow dry the flow chamber. Dry the sensor head surface with a clean soft tissue.
The analyzer uses an internal barometric pressure sensor during this calibration. First check that the pressure sensor is correct and does not need recalibrating. If it does need to be recalibrated then follow the instructions in “Barometric Pressure Sensor Calibration” on page 35 before attempting this calibration.
1)Set the gas measurement phase to Gaseous and set the calibration medium to In measured pure gas at atmospheric pressure (as detailed in “Calibration Medium” on page 32).
2)Connect a source of pure H2 or N2 gas to the inlet of the flow chamber, as illustrated in Fig
3)Press the CAL button. Remember, this button may have been locked out to prevent an accidental reset (see “Locking Out the Instrument’s CAL Button” on page 32 for details).
4)Press the CAL button. Remember, this button may have been locked out to prevent an accidental reset (see “Locking Out the Instrument’s CAL Button” on page 32 for details).
5)A brief clearing message
6)Press CAL again within a 3 second period.
If the instrument makes two consecutive measurements with less than 1% difference, it calibrates against this stabilized value. The LCD then displays the message [CAL] to indicate calibration has been successfully completed
If the calibration does not complete, the LCD displays the message [Err]. The reason for this calibration error is either that the measured gas partial pressure is under 5 mbar, or that a wrong instrument key was pressed during the calibration steps.
ORBISPHERE | Operator Manual |