Emerson Rosemount CT5800, Manual

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Figure 6-1: Main menu
Use the Main menu to access the software routines and screens that are used for
calibration and maintenance. Five options are presented ( Figure 6-1 ). For more
information about the options on the Main menu , see Main menu .
On the Main menu , use and to scroll between the menu options.
When the option you want is highlighted (
GAS SERVICE
is the example shown in Figure
6-1 ), press to go to the first screen of that software routine.
6.3 Calibration
Calibration flows the known cylinder gas through the analyzer and then adjusts the
readout until the measurement matches the cylinder. The analyzer then applies this
adjustment to all measurements until the next calibration. There are two circumstances in
which you may want to calibrate.
1. After you verify gas concentrations (see Verifying gas concentrations ) and find that
the analyzer readings are outside of tolerance
2. At regular intervals, such as once a day or once a shift
6.3.1 Zero calibration
Zero calibration is calibrating the analyzer so that when no sample gas is flowing through
it, the gas concentrations measured by the analyzer are zero. To zero calibrate, calibrate
the analyzer measurements against a known sample gas using the following procedure:
Prerequisites
Run the analyzer at a stable temperature for at least thirty minutes prior to commencing
this procedure.
Use nitrogen gas of "instrument gas" purity as the zero calibration gas.
Gas calibration Reference Manual
September 2019 00809-0100-5800
82 Emerson.com/Rosemount