Operation
Alarms Menu
3-80 Model 42i Low Source Instruction Manual Thermo Electron Corporation
• Use and to increment or decrement the numeric value.
• Press to save set to value as actual value.
Zero and Span Auto
Calibration
The Zero Auto Calibration screen (read only) allow the user to view the
status of the most recent auto background calibration. The zero and span
auto calibration screens are displayed if the auto calibration option is
installed and function the same way.
• In the Main Menu, choose Alarms > Zero or Span Autocal.
NO, NO
2
, and NO
x
Concentration
The NO Concentration screen displays the current NO concentration and
sets the minimum and maximum alarm limits. Acceptable alarm limits
range from 0 to 500,000 ppb (0 to 500 ppm) and 0 to 750,000 µg/m
3
(0 to
750 mg/m
3
). The minimum alarm may be programmed as a floor trigger
(alarm is triggered when the concentration falls below the minimum value)
or a ceiling trigger (alarm is triggered when the concentration goes above the
minimum value). If the NO concentration goes beyond either the
minimum or maximum limit, an alarm is activated. The word “ALARM”
appears in the Run screen and in the Main Menu. The NO
2
and NO
x
Concentration screens function the same way.
• In the Main Menu, choose Alarms > NO, NO
2
or NO
x
Concentration.
MAX ZERO CHECK OFFSET:
CURRENTLY: 10.00
SET TO: 11.00 ?
©ª CHANGE VALUE
SAVE VALUE
RANGE AVG DIAGS ALARM
ZERO AUTO CALIBRATION:
ALARM: OK
RESPONSE: 5.00
RANGE AVG DIAGS ALARM
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