Emerson Rosemount CT4400, Reference Manual

Page: 92 / 106

CAUTION
EQUIPMENT DAMAGE
Always follow this shutdown procedure. Damage to the analyzer may result from a failure
to follow this procedure.
The analyzer normally operates continuously. It should only be necessary to shut down the
analyzer in the following circumstances:
— In order to perform repairs or maintenance on the analyzer.
— When the analyzer has to be switched off as part of a plant shutdown or plant maintenance.
Use the display controller to perform the shutdown procedure.
Operation of the analyzer is controlled through the display controller located on the front
panel of the analyzer.
NOTICE
The gas concentrations shown in the following screenshots may be different from those
shown in your particular analyzer. The screenshots indicate the functionality of the
software, which is the same regardless of the gases or gas concentrations being measured.
Procedure
1. Shut down the gas handling system that conditions the sample gas and feeds it to
the analyzer. Lock-out the gas handling system to prevent its unauthorized
operation during maintenance, which could cause an escape of gas.
WARNING
HIGH PRESSURE GAS AND AIR
The gas supply operates at a pressure that can cause injury, e.g., damage to eyes
and skin punctures from debris blown by high pressure gas or compressed air.
2. Purge any sample gas in the pipe/tube from the gas handling system to the analyzer
using factory air or a regulated nitrogen supply.
3. Allow the analyzer to run for five minutes with the purge gas connected, so that any
sample gas in the analyzer is vented to the exhaust.
4. Use the display controller on the front of the analyzer to perform the shutdown
process.
5. On the display controller, check that the gas concentration reads 0 ppm or 0%
before stopping the purge gas.
6. Turn off the purge gas supply to the analyzer. Lock-out the purge to prevent its
unauthorized operation.
7. The Shutdown procedure can be started as follows.
The SYSTEM menu screen can be accessed from the Main Menu screen.
Shutdown procedure Reference Manual
January 2020 00809-0100-4244
92 Rosemount CT4400