Operation
Instrument Controls Menu
3-30 Model 42i Low Source Instruction Manual Thermo Electron Corporation
Instrument Controls
Menu
The Instrument Controls menu contains a number of items. The software
controls listed in this menu enable control of the listed instrument
functions.
• In the Main Menu, choose Instrument Controls.
Ozonator The Ozonator screen is used to turn the internal ozonator on or off. The
display shows the status of the control line that turns the ozonator on or off.
The next line of the display shows the user-specified ozonator setting. Under
most conditions, the control line status and ozonator set status are the same.
However, as a safety precaution, the microprocessor can override the
user-specified ozonator setting. This occurs only if the ozonator flow doesn’t
indicate any flow or if the NO
2
converter temperature is below the
minimum alarm limit. In this case, an alarm is activated and the ozonator is
turned off. This is done to prevent the ozonator from overheating, which
will result in permanent damage to the ozonator, or if the converter
temperature drops below the minimum limit, which reduces the
effectiveness of the ozone destruct.
It is possible, however, to defeat this feature, by setting the ozonator safety
“OFF” in the “Service Menu”.
Note The ozonator must be “ON” to obtain NO, NO
2
, and NO
x
readings.
As an additional safety precaution, a lit LED mounted on the measurement
interface board indicates that the ozonator is on.
• In the Main Menu, choose Instrument Controls > Ozonator.
•Press to toggle and set the ozonator on or off.
INSTRUMENT CONTROLS:
>OZONATOR
PMT SUPPLY
AUTO/MANUAL MODE
DATALOGGING SETTINGS
COMMUNICATION SETTINGS
I/O CONFIGURATION
TEMPERATURE COMPENSATION
ª
RANGE AVG DIAGS ALARM
PRESSURE COMPENSATION
SCREEN CONTRAST
SERVICE MODE
DATE/TIME
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