Operation
Instrument Controls Menu
Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-31
PMT Supply The PMT Supply screen is used to turn the PMT power supply on or off.
This is useful in a troubleshooting situation.
• In the Main Menu, choose Instrument Controls > PMT Supply.
•Press to toggle and set the PMT supply on or off.
Auto/Manual Mode The Auto/Manual Mode screen allows selection of the automatic mode
(NO/NO
x
), NO mode (manual NO), or NO
x
mode (manual NO
x
). The
auto mode switches the mode solenoid valve automatically on a 10 second
cycle so that NO, NO
2
, and NO
x
concentrations are determined. The
manual NO mode puts the mode solenoid valve into the open position so
that the sample gas bypasses the NO
2
-to-NO converter. Therefore, only the
NO concentration is determined. The manual NO
x
mode puts the mode
solenoid valve into the closed position so that the sample gas passes through
the NO
2
-to-NO converter. Therefore, only the NO
x
concentration is
determined. In the manual modes, additional averaging times of 1, 2, and 5
seconds are available from the Averaging Time screen.
• In the Main Menu, choose Instrument Controls > Auto/Manual Mode.
• Use and to scroll through a list of choices.
OZONATOR:
CURRENTLY: OFF
SET TO: ON ?
TOGGLE VALUE
RANGE AVG DIAGS ALARM
PMT SUPPLY:
CURRENTLY: OFF
SET TO: ON ?
TOGGLE VALUE
RANGE AVG DIAGS ALARM
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