3-40 | Model 933S UV Analyzer
9. After the sample system has been bled down, recap the Vent Outlet.
Disconnect the Zero gas from the Sample Inlet fitting and reconnect it
to the Zero Gas fitting on the analyzer.
Reconnect the Sample Line to the Sample Inlet fitting on the analyzer.
Keep the Sample Inlet valve closed.
10. Change the Flow Control setting to ‘3’ (zero). Click OK then Apply.
Do not save the changes to EEPROM.
11. Increase the pressure of the Zero gas to 550 KPA (80 PSIG). Use the
pressure gauge mounted on the backpan to observe the pressure.
12. Repeat Step 6 (shut off Zero gas) to check if there’s a leak at the
Sample Inlet fitting. If so, check the connection and fix the leak before
continuing.
13. Repeat Step 8 to safely bleed down the sample system and remove the
cap fitting from the Vent Outlet.
14. After the sample system has been bled down, remove the cap from the
Vent Outlet and reconnect the Vent Line to it.
15. Change the Flow Control setting to ‘0’ (auto). Click OK then Apply.
Save the changes to EEPROM.
16. If the analyzer uses Measured Pressure Compensations (optional),
return the setting to Measured mode To do this, view the Cell/Misc
Parameters dialog box and enter ‘0’ in the Default Cell Pres (pressure
compensation) field.
17. Open the valves isolating the analyzer from the sample stream. Set the
pressure to 550 KPA (80 PSIG) using the Sample Gas Pressure Regula-
tor or the Rotameter.
If using the Rotameter, the arrow on the handle of the three-way valve
must be facing downward while setting the sample gas flow rate.
After the flow rate has been set, switch the Bypass Valve to BYPASS
by turning it 180° (arrow on valve handle facing upward). This will
ensure no damage is done to the Rotameter during Column switch-
ing.
18. If you are finished working on the analyzer, close the Configurator
Software, power down the computer, and disconnect the serial cable
from the analyzer’s Communications Port. Close the Communications
Port cover and tighten the screw to secure it in place.
The procedure is complete and the analyzer is ready to analyze sample gas.
!
CAUTION
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