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9.
Check that there is gas flow out of the overflow vent and the stream outlet,
but not out of the chamber vent.
10. If remote control will be used, turn the mode selector switch to the
REMOTE position, and program the unit for ZERO mode.
11. Check that there is gas flow out of the chamber vent, overflow vent, and
stream outlet.
12. Program the unit for the SPAN mode.
13. Check that there is gas flow out of the overflow vent and the stream outlet,
but not out of the chamber vent.
14. Press the heater power switch and note that the indicator illuminates.
15. Let the unit sit under power until the temperature equilibration indicator
flashes regularly, about once every second. This usually takes approximately
1.5 hours.
16. After the chamber temperature has reached equilibrium, remove the front
panel indicator using the supplied tool, and remove the chamber cap.
17. Use the supplied forceps to insert the preconditioned permeation device in
the center of the chamber.
18. Reinstall the chamber cap and door. Make sure that the cap is secure and
that the door is in the locked position. Failure to lock the door will disable
the function of the temperature control.
19. After appropriate equilibration time, set flows to achieve the output concen-
tration required.
Verifying Operation
19
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