Galvanic Applied Sciences 943-TGX, Operation Manual

Page: 87 / 110

Revision 4 87 August 02, 2019
7.9 Steam Purging the Sample Probe Assembly
Steam Purging the Sample Probe Assembly is recommended
only when
a plug in the probe
is suspected and should only be performed as a last resort to avoid the possibility of steam or
condensate introduction to the measurement cell. The residue of some boiler water
chemicals in the measurement cell will cause a loss of spectrometer energy.
Steam Purging the Sample Probe Assembly
is to be performed by trained
and authorized personnel only.
Procedure:
a) Click the On Line / Off Line switch to indicate that the system is Off Line .
b) Place the analyzer in back purge mode. This can be done by navigating to the
Back
Purge
field on the Analysis 1 page and pressing
Enter
to place an “x” in the box.
c) Open the oven cabinet door and remove the oven compartment cover.
The control cabinet door may NOT be opened while the analyzer is
energized UNLESS the area is known to be non-hazardous. Observe all the
warning labels on the analyzer enclosures.
d) Close valves V1 and V3 (sample and vent line valves). The recommended procedure is
to remove sections of tubing on the measurement cell side of valves V1 and V3, and
install fitting plugs on these valves. This will guarantee that the measurement cell is not
inadvertently exposed to steam or condensate. Steam can be connected to the Probe
Access ports (sample side and/or vent side) on the side of the oven enclosure.
e) The steam supply line should be blown down to clear the line of condensate before
steam connection is made.
f) To commence Steam Purging the Sample Probe Assembly, switch valves V2 and V4 to
the On position. (See Oven Valve labeling for valve identification.)
The oven compartment and all of its components are HOT (150ºC/300ºF).
Wear appropriate personal protective equipment (gloves, eye wear,
clothing etc) if you are working with hot surfaces or wait until surface have
cooled to safe temperatures before performing maintenance tasks.
Zero gas will be venting into the oven when the tubing is removed.
g) Replace the oven compartment cover. Ensure that the Fibre Optic Cables are still routed
in the indents to avoid damage when the oven compartment cover is secure.
h) Steam Purge the Sample Probe Assembly for (15 to 30 minutes).