Emerson Rosemount CT5400, Installation, Operation And Maintenance Manual

Page: 65 / 176

6 Gas Calibration Procedures
6.1 Required tools
To calibrate the analyzer, you need the following items:
• Nitrogen gas of instrument gas purity for use as a zero calibration gas
• Suitable span calibration gases for each gas measured
• Gas bottle pressure regulators
• Interconnecting hoses to connect the gas bottles to the analyzer
• A T-piece and excess flow line
NOTICE
In the case of gases such as H
2
O, where it is not normally possible to obtain calibrated gas
cylinders, it will usually be measured by the same laser as some other gas. Validating the other
gases measured by the analyzer (particularly any which are measured by the same laser as
H
2
O) can demonstrate that the system is functioning correctly, meaning there is no need to
calibrate the water measurement directly.
If calibration must be carried out (e.g., for legal requirements), it can be calibrated by using a
water vapor generator to supply a known concentration of water vapor.
6.2 Main menu
The calibration functions are accessed through the Main menu ( Figure 6-1 ). To get to the
Main menu , press MENU on either the Gas Sensor Main screen or the Pressure and
Temperature screen, as described in Section 4.9 .
Main menu Figure 6-1:
Gas Calibration Procedures
Installation, Operations, and Maintenance Manual 45