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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 screen appears.
Note If Service is not displayed, refer to
page
7-11, 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
pressure, and press
10. Reconnect the tubing to the pressure transducer.
11. Install the cover.
Pressure Transducer Calibration (Photometer option)
to scroll to Service > press
""Accessing the Service Mode"
to select Zero.
to enter the known barometric
to save the pressure value.
Model 146i Instruction Manual
Servicing
>
.
on
to select Span.
7-41
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Troubleshooting
