Emerson Rosemount CT4400 Reference Manual page 55

Reference Manual
00809-0100-4244
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. Ensure that a suitably rated pressure regulator is connected to the reference gas
3. Connect a hose from the reference gas bottle, through a T-piece, to the sample
4. Connect an excess flow line to the unused port on the T-piece and route the excess
5. On the display controller of the analyzer select the Main Menu screen.
Reference Manual
Option
Figure 6-9: Next Gas Service
bottle.
supply port on the rear panel of the analyzer.
flow line to a suitable extractor.
Description
To select the next gas from the Select
Gas screen.
To return to the Main Menu.
To return to the Gas Sensor Main screen
(Figure 4-4).
Gas calibration
January 2020
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