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Operation
Service Menu
Calibration
Pressure/Temperature
3-86
Model 146i Instruction Manual
Note Changing the flow controller selection may affect allowable limits for
span concentration and total flow. If is advisable to check these settings.
The mass flow controllers are accurate to only ± 2% upon delivery from the
manufacturer. The instrument includes factory-set calibration curves to
improve this accuracy. To achieve an equivalent accuracy when installing
new controllers, see
"Gas Flow
In the Main Menu, choose Service > Flow Control Selection > Gas.
●
GAS FLOW CONTROLLER:
CURRENTLY:
SET TO:
OPER
MODE
The Calibrate Pressure/Temperature screen is used only prior to calibrating
the flow controllers. These values are used to convert from volumetric flow
to standard flow in the flow controller calibration screens. The flow
controllers are calibrated prior to shipment. However, if you need to re-
calibrate the flow controllers, you can use this screen to enter the pressure
and temperature that existed during re-calibration.
Note When calibrating the flow controller, the pressure and temperature
of the area immediately around the external flow sensor must be entered for
an accurate calibration. The pressure is in millimetres mercury and the
temperature is degrees Celsius.
This adjustment should only be performed by an instrument service
technician.
▲
In the Main Menu, choose Service > Calibration Pres/Temp.
●
Calibration" later in this chapter.
25 SCCM
200 SCCM?
CHANGE VALUE
SAVE VALUE
DIAGS ALARM
▲
▲
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Thermo Fisher Scientific
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Troubleshooting
