5-54 | Model 900 ADA / Model 930 Sulfur Pit Analyzers
Purged Analyzers:
Insert the key into the Purge Bypass Switch and switch it to the
“BYPASS” position (follow company policy).
[Special Conditions for Safe Use]
The analyzer may only be energized by using the Purge Bypass
Switch with permission of the works manager or his proxy. The per-
mission may only be given when it is made sure that during the time
the system is energized by using this switch an explosive atmosphere
is not present or when the necessary protective measures against
explosion hazard have been taken (“hot permit”).
The analyzer enclosure may not be opened when an explosive atmo-
sphere is present.
Close the power-disconnect switch to apply main AC power to the
analyzer. Do not close the Oven Heater fuse at this time, until after the
Leak Check has been performed.
22. Perform a leak check on the sample system fittings that were
disconnected.
23. Close the Oven fuse to apply power to its Heater. Close and secure the
Electronics Enclosure door with its (3) M6 screws to secure the Optical
Bench in place. Close and latch the Oven door. Close and secure all
other analyzer covers and doors, if not already done.
Allow the analyzer to warm up to operating temperature and stabilize
(approximately two hours). When the analyzer is at operating tem-
perature, open the Vent Valve on the ASR900 Sample Probe and then
open its Sample Valve to allow sample gas into the analyzer sample
system.
24. Purged Analyzers Only:
Return the Purge Bypass Switch to the “ACTIVE” position and re-
move the key (follow company policy).
25. Manually Zero the analyzer.
26. Change the Flow Control setting back to Analyzer Control mode.
27. Adjust the Aspirator Drive Air Regulator to achieve normal operating
flow rates.
The procedure is complete.
!
WARNING
See “Sample System
Leak Check” in Chapter 3.
(FlowCtrl) CALF5 0
Del 0 Ent
See “Setting the
Sample Gas Flow Rate and
Sample Response Time” in
Chapter 3.
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