User guide

13
Configuration
The Model 235 has been designed to provide high accuracy dilution of permeated
gases in both automatic and manual operation modes with minimal configuration.
The input necessary to configure the instrument is accomplished on two screens,
the Setup and Tubes screens. The specifics for each permeation device and the
time, date and units of measure are all that is required for configuration.
Setup Screen
Select the Setup screen by touching the “Setup” tab on the left hand side of
the display. On this screen, the following parameters are established:
Concentration units
Concentration units are chosen by selecting PPM or PPB.
Minimum flow
This is factory set to 300 cc/min, the minimum total flow on the Model 235.
To input a new (higher) value
Touch inside the white text field, then use the numeric keypad to input the
new value. Select “Enter” to apply the change and hide the input pad.
To revert to the previous data
Select “Cancel” to revert to the previous data and hide the input pad.
To remove incorrect input
Select “Clear” to remove incorrect data and input new data.
Date/Time
To change the date/time:
1. Select the “Change” button to the right of the Year/Month/Day display.
2. Touch the white field for the year, month, or day to open an input control.
3. Use the +/- buttons to adjust the value, then select “OK” to enter the
selection for that box.
4. When all boxes are properly configured touch the “Apply” button.
5. Select “Yes” to accept the new values, or “No” to cancel the operation.
Changes to the date and/or time will completely delete all pri-
or flows/temps/concentrations previously stored in memory.
Figure 7: Model 235 Setup screen
Initial Set-Up