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Servicing
Pressure Transducer Calibration
7-28
Model 43i Trace Level-Enhanced Instruction Manual
Equipment Damage Some internal components can be damaged by small
amounts of static electricity. A properly ground antistatic wrist strap must
be worn while handling any internal component.
1. Remove the cover.
2. Disconnect the tubing from the pressure transducer and connect a
vacuum pump known to produce a vacuum less than 1 mm Hg.
3. From the Main Menu, press
to scroll to Pressure Calibration > and press
The Pressure Sensor Cal menu appears.
Note If Service Mode is not displayed, refer to "Accessing the Service
Mode" in this chapter, then return to the beginning of this step.
4. At the Pressure Sensor Cal screen, press
The Calibrate Pressure Zero screen appears.
5. Wait at least 10 seconds for the zero reading to stabilize, then press
to save the zero pressure value.
6. Disconnect the pump from the pressure transducer.
7. Press
to return to the Pressure Sensor Cal screen.
8. At the Pressure Sensor Cal screen, press
The Calibrate Pressure Span screen appears.
9. Wait at least 10 seconds for the ambient reading to stabilize, use
and
and press
to save the pressure value.
10. Reconnect the instrument tubing to the pressure transducer.
11. Install the cover.
▲
to scroll to Service > press
to select Zero.
to enter the known barometric pressure,
>
.
▲
to select Span.
Thermo Fisher Scientific
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Troubleshooting
