Thermo Scientific 146i, Instruction Manual

Page: 229 / 340

Servicing
Pressure Transducer Calibration (Photometer option)
Thermo Fisher Scientific Model 146 i Instruction Manual 7-41
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 Service > press >
to scroll to Pressure Calibration > and press .
The Pressure Sensor Cal screen appears.
Note If Service is not displayed, refer to “ “Accessing the Service Mode” on
page 7-11 , then return to the beginning of this step.
4. At the Pressure Sensor Cal screen, press to select Zero .
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 to select Span .
The Calibrate Pressure Span screen appears.
9. Wait at least 10 seconds for the ambient reading to stabilize, use
and to enter the known barometric
pressure, and press to save the pressure value.
10. Reconnect the tubing to the pressure transducer.
11. Install the cover.