1.7
1.8 Calibration - General
For optimum performance, it will be necessary to routinely check the calibration of all of the
internal gas sensors within the analyser. The recommended periods for each sensor type are
shown in Table 1.2.
In addition, the pressure compensation associated with the purity paramagnetic sensor should
be checked annually (the procedure is covered in the Quickstart manual).
The calibration procedure is dealt with in the Quickstart manual. However, this manual details
the requirements for and configuration of calibration ancillaries (such as gases) and (when
autocalibration is used) the connection of solenoid valves, the potential use of the RS232
output and remote initiation switch and the use of Modbus to initiate calibration.
(When the optional external autocalibration or the optional internal autocalibration manifold are
configured and fitted, a manual calibration adjustment or calibration check will use the
autocalibration valves to select the calibration sample gases as required).
1.9 Automatic calibration options
All 4000 series analysers include the software necessary to provide automatic calibrations.
In the case of 'external' autocalibration, external (i.e.: customer supplied) solenoid valves may
be controlled by interrogating the serial output signal or by discrete wiring to relays on the
analyser (ensure that sufficient optional output cards have been installed).
The automatic calibration procedure may be started by any of the following:
• A user keyboard input
• A trigger from the internal instrument clock
• An external contact closure
• A Modbus command
Table 1.2: Recommended calibration periods
Gas sensor module Low calibration High calibration
Gfx sensor weekly monthly
IR sensor weekly daily
Paramagnetic sensor (purity) monthly weekly
Paramagnetic sensor (other) weekly weekly
Zirconia sensor monthly monthly
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