Emerson Rosemount CT5800, Manual

Page: 81 / 192

6 Gas calibration
6.1 Required tools
The gas concentrations measured by the analyzer can be validated against a known
sample gas or calibrated to match it by using the following gas calibration procedure.
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 you need to calibrate (e.g., for legal requirements), you can use a water vapor generator
to supply a known concentration of water vapor.
6.2 Main menu
Access the calibration functions 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 Main menu .
Reference Manual Gas calibration
00809-0100-5800 September 2019
Rosemount CT5800 81