Galvanic Applied Sciences 943-TGX-CE, Operation Manual

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Revision 4 124 April 2020
on the sample inlet side of the probe that is preventing sample from being drawn up
the probe and into the measurement cell.
•
Cell pressure increasing dramatically when analyzer is switched to sampling mode
–
this indicates that there may be a blockage on the vent side of the probe that prevents
the aspirator drive air from entering the process pipe; this will cause a high sample cell
pressure.
•
Response time from zero to sample increases for a set aspirator drive air flow rate
–
this indicates a partial blockage in the sample probe that is restricting the flow rate in
the probe and thus increasing the response time.
Prior to performing a steam purge, the method described in Section 3.4.4 using adjustments in
the zero air flow to clear obstructions in the probe and analyzer sampling system should be
attempted. Only if this method is unsuccessful should the steam purge procedure be performed.
Steam Purging the Sample Probe is to be performed by trained and authorized
personnel only.
To perform the a steam purge of the sample probe assembly, follow the procedure below: :
1. Place the analyzer in Offline mode by toggling the Online / Offline control toggle
(Section 4.3.1) on the Analysis 2 panel to Offline (red).
2. Place the analyzer in back purge mode by pressing the F6 key on the keypad OR by
placing the X in the Back Purge check box on the Analysis 1 panel.
3. Open the oven cabinet door and remove the black lid on the oven enclosure.
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.To open the control cabinet door
while the analyzer is energized, the purge control box must first be
bypassed. Refer to Section 3.3.
The oven enclosure 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.
4. Close valves V1, V3, and V5. Prior to performing a steam purge, Galvanic Applied
Sciences also recommends disconnecting the measurement cell side fittings on valves
V1 and V3 and install plugs on these valves. This will prevent steam or condensate
from entering the measurement cell.
5. Blow down the steam supply lines to be used for steam purging the sample probe
assembly prior to connecting to the analyzer to clear the line of any condensate.
6. Connect steam supply lines to the Sample Side Access and/or Vent Side Access ports
on the left side of the analyzer cabinet.
7. Switch valves V2 and V4 to the ON position. This will begin the steam purge process.
Zero gas will be venting into the oven when the tubing is removed.