4.6
4.3 Steam Heated Cell
Some 2500's are fitted with steam heated cells, and at this stage suitable low pressure
steam, typically at 14-21kPa, 2-3 psig venting to atmosphere after the cell, should be
connected ready for use, but do not pass steam into the heating coil yet. Fittings for
1/8" o.d. tube are normally provided.
4.4 Process Stream Connection
4.4.1 Basic Operation
The process stream connections to and from the 2500 sample cell inlet and outlet
should now be made. The inlet and outlet are 1/4" o.d. stubs. Connections will normally
be from a local sample conditioning system. Ensure that any pressure compensation
transducer is correctly fitted. Ensure that all connections are made securely with the
correct compression fittings, of suitable materials. Gas samples should enter the cell
from above. (Refer to Figure 2.1).
Do NOT pass process samples into the 2500 yet.
4.4.2 High Integrity Operation
This is the recommended mode of operation and where appropriate, the process
sample can be routed via the "Sample/Inert" solenoid valve, controlled by the 2500,
which will only permit sample to enter the sample cell when it is fully warmed up and
no serious faults are present. See Section 3.3.5.
Do NOT pass process samples into the 2500 yet.
4.5 Power-Up
1. Confirm that all electrical and plumbing connections have been correctly made as
described in the preceding sections.
2. Ensure purge gas is applied to the Purge Controller (Where Fitted).
3. Apply power to the 2500 (via the Purge Control System for EU1 Versions).
4. Apply steam to any steam-heated cells fitted.
5. The 2500 will show the start-up and Identity display as follows:
– Self-checks (Fault and Alarm LEDs tested)
– System O.K.
– Analyser identity/Software revision number.
– Serial number and order number.
– Calibration (measurand, range, units).
– Commence measurement.
WARNING
In either case for toxic/flammable samples ensure that the sample inlet line
has a suitable restrictor inserted to limit sample flow in case of catastrophic
failure of sample tubing/cell connections.
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