Galvanic Applied Sciences 943-TGS-CE, Operation Manual

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Revision 5 128 August 2021
13. Reconnect the AC Power to the oven heaters by pushing down and snapping closed
the oven heater fuse terminal cover (ACTS:25). The oven will begin heating to the set
point temperature.
14. Close and latch the oven enclosure cover.
15. Close and latch the control cabinet and oven cabinet doors.
16. Once the measurement cell temperature rises to >140°C, and the Cell Temperature
fault has cleared, use the F2 / F1 keys to navigate to the Analysis 1 panel. Perform a
manual zero calibration cycle by using the F4 / F3 keys to highlight Manual Zero , then
press
↵
..
17. Once the manual zero calibration cycle is complete, place the analyzer into sampling
mode by highlighting the Sample checkbox using the F4 / F3 keys, then press
↵
.
Alternatively, press the F6 key.
18. Once normal operation has been confirmed, return the Online / Offline control toggle
on the Analysis 2 panel back to Online (green).
The oven can take up to two hours to reach operating temperature. While
the cell temperature is below the Low Cell Temperature fault set point, the
system will continue to back purge and maintain a fault indication to the
control room.
7.9 Steam Purging the Sample Probe
Steam Purging the Sample Probe 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
contamination in the sample cell, particularly on the cell windows. The residue of some boiler
water chemicals on the cell windows will cause a loss of spectrometer energy, potentially
resulting in High Integration Period warnings or even a fault condition in a worst-case scenario.
There are some indications potential warning signs that may indicate the potential need to
perform a steam purge of the probe. These include but are not limited to:
• Absorbance spectrum and concentration readings remaining at zero even when the
analyzer is switched to sampling mode – this indicates that there may be a blockage
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.