Metek 920, Operator'S Manual With Essential Health And Safety Requirements

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Maintenance and Troubleshooting
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5-39
14. 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 temper-
ature, open the isolation valve on the Vent Valve (or remove the cap
and reconnect the Vent Pipe to the Vent port in the Analyzer Oven).
Open the isolation valve on the Sample Valve (or remove the cap and
reconnect the Sample Line to the Sample port in the Analyzer Oven)
to allow sample gas into the analyzer sample system.
Optional (systems with Heated Acid Gas Sample Probe):
When the analyzer is at operating temperature, open the Vent Valve
on the HAG Probe and then open its Sample Valve to allow sample gas
into the analyzer sample system.
15. Purged Analyzers Only:
Return the Purge Bypass Switch to the “ ACTIVE ” position and re-
move the key (follow company policy).
16. Manually Zero the analyzer.
17. Change the Flow Control setting back to Analyzer Control mode.
18. Adjust the Aspirator Drive Air Regulator to achieve normal operating
flow rates.
The procedure is complete.

(FlowCtrl) CAL

F5 2

Del 0 Ent

See “Setting the
Sample Gas Flow Rate and
Sample Response Time” in
Chapter 3.