Operation
Alarms Menu
Thermo Electron Corporation Model 48i Instruction Manual 3-99
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 visible only if the auto calibration option is
enabled and function the same way.
• In the Main Menu, choose Alarms > Zero or Span Autocal.
• Press to return to the Alarms menu or to return to the
Run screen.
Concentration The Concentration screen displays the current CO concentration and sets
the minimum and maximum alarm limits. Acceptable alarm limits range
from 0 to 10,000 ppm. 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 CO 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.
• In the Main Menu, choose Alarms > Concentration.
• Use and to move the cursor up and down.
• Press to select a choice.
• Press to return to the Alarms menu or to return to the
Run screen.
XXLO WCONCENTRATIONXXLO W
CO 15.80 PPM
SAMPLE 12:34 ALARMx
ZERO AUTO CALIBRATION:
ALARM: OK
RESPONSE: 0.200
RANGE AVG DIAGS ALARM
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