Pressure Calibration - Thermo Scientific 49i Instruction Manual

Operation
Service Menu

Pressure Calibration

Calibrate Pressure Zero
3-88 Model 49i Instruction Manual
SINGLE/DUAL/AUTO RANGE:
CURRENTLY:
SET TO:
RANGE AVG
The Pressure Calibration menu is used to calibrate the pressure sensor to
zero, span, or restore factory default values. The pressure calibration is
visible only when the instrument is in service mode. For more information
on the service mode, see "Service Mode" earlier in this chapter.
The pressure sensor's zero counts and span slope are displayed on the menu.
Note This adjustment should only be performed by an instrument service
technician.
• In the Main Menu, choose Service > Pressure Calibration.
PRESSURE SENSOR CAL:
>ZERO
SPAN
SET DEFAULTS
RANGE AVG
The Calibrate Pressure Zero screen calibrates the pressure sensor at zero
pressure.
Note A vacuum pump must be connected to the pressure sensor before
performing the zero calibration.
• In the Main Menu, choose Service > Pressure Calibration > Zero.
• Press to save the current pressure reading as the zero reading.
SINGLE
DUAL ?
CHANGE VALUE
SAVE VALUE
DIAGS ALARM
72
1.1447
DIAGS ALARM
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