Servomex 07931001B, Operator'S Manual

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07931001B revision 6 © Servomex Group Limited. 2020
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6.7 Calibrate
Note: Before you attempt to calibrate the system, let the instrument operate until
stable.
Calibration general sequence
If required, connect and start purging of dead volumes in TU and RU Purge 1
–
Measurement or Environmental IN e.g. for an O
2
measurement.
Connect calibration gas and flush system for a minimum of 15 minutes, (30
minutes recommended). Typical flows between 500 to 1000 ml/min
Note: Measurement purge requires ventilation
Note: Ensure zero readings for zero-gas concentration
Wait for the system to reach a stable reading, measurement stability must be
assured before requesting calibration
Check that the reading agrees with the concentration of certified gas within
specified tolerance, then press calibrate
Flush calibration cell with inert gas before removal of analyzer
Remove analyzer and reinstall as per section 7.7.1
Hint:
When re-mounting the transmitter and receiver units care should be taken
to avoid disturbing, and potentially misaligning, the mounting assembly.
Note : N2 should be used for purging during calibration to prevent atmospheric gases
such as O2, CO2, and H2O present in the atmosphere, from interfering with the
calibration process.
There are two distinct calibrations for the instrument to be performed in correct
sequence: