Thermo Scientific 146i, Instruction Manual

Page: 157 / 340

Preventive Maintenance
Capillary Service
Thermo Fisher Scientific Model 146 i Instruction Manual 5-5
Note
Selecting these menu choices will affect the analog outputs.
1. Press to display the Main Menu.
2. Use to scroll to Service, press > to scroll to
Intensity Check and press .
The Intensity Check menu appears.
Note
If Service is not displayed, refer to “ “Accessing the Service Mode” on
page 5-2 , then return to the beginning of this step.
3. Select either Reference Gas or Sample Gas.
Either the Photometer Reference Gas screen appears or the Photometer
Sample Gas screen.
The noise value displayed after 20 seconds should be below 4.0 Hz for a
fully warmed-up lamp (see
“Troubleshooting Guides” on page 6-2 in
the “Troubleshooting” chapter if the noise is excessive).
Degradation of detector frequency to below 65 kHz indicates either a dirty
cell or low lamp output. In addition to degrading the measured detector
frequency, dirt in the cell can decompose the ozone and give erroneous
readings. Therefore, the cell should first be cleaned and the frequency
re-measured.
Capillary Service
The Model 146 i includes the following capillaries (depending on the
instrument options).
Ozonator capillary
Photometer capillary
Pressure gauge capillary
Pump capillary
If there are indications that a capillary may be blocked, perform the
following procedures as appropriate. See the associated capillary
replacement procedure for a description of how to remove the capillary for
inspection and cleaning.