Emerson Rosemount CT5400, Installation, Operation And Maintenance Manual

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Calibration Complete Screen Figure 6-9:
18.
Press to display the Calibrate gas screen ( Figure 6-4 ) and perform a span
calibration on the same gas (see Section 6.3.2 ).
19.
Press to perform a zero calibration for another gas.
The software Select gas screen ( Figure 5-1 ) displays.
20. Repeat steps 7 - 17 for the next gas.
21.
If you are finished calibrating the analyzer, press .
The Main menu ( Figure 6-2 ) displays.
6.3.2 Span calibration
The span gas concentrations measured by the analyzer when reference gas is flowing can
be verified and, if necessary, calibrated against the known reference gas by using the
following procedure.
Prerequisites
Run the analyzer at a stable temperature for at least thirty minutes prior to commencing
this procedure.
Procedure
1. Use a certified reference gas cylinder as the source of the span calibration gas.
2. Make sure that a pressure regulator is connected to the reference gas bottle.
3. Connect a hose from the reference gas bottle, through a T-piece, to the sample
supply port on the rear panel of the analyzer. Connect an excess flow line to the
unused port on the T-piece and route the excess flow line to a suitable extractor.
4. On the display controller of the analyzer, browse to the Main menu as described in
Section 4.9 .
Gas Calibration Procedures
Installation, Operations, and Maintenance Manual 51