Emerson Rosemount CT4400 Reference Manual page 44

Verifying gas concentrations
January 2020
5.1.2 Span verification
To verify the span gas concentrations measured by the analyzer when reference gas is
flowing:
Procedure
1. Use a certified reference gas cylinder as the source of the span verification gas.
2. Ensure 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
4. Connect an excess flow line to the unused port on the T-piece and route the excess
5. On the display controller, browse to the Main menu.
6. Press
44
Figure 5-6: Next Gas Service
If the reading is outside tolerance, follow the
supply port on the rear panel of the analyzer.
flow line to a suitable extractor.
or , select GAS SERVICE. Press
Figure 5-7: Main Menu
Reference Manual
00809-0100-4244
Zero calibration.
.
Rosemount CT4400