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3.7 Manage your gas chromatograph’s analog
inputs
With MON2020 you can control analog inputs in the following ways:
• Assign identifying labels.
• Assign scale ranges.
• Calibrate analog inputs for zero and full scale values.
Note
Electrical current signals ranging from 4 to 20 mA (±10%) are accepted as analog inputs.
3.7.1 Rename an analog input
Give each analog input a descriptive label to avoid confusing one unit for another. To
assign an identifying label, do the following:
1. Select Analog Inputs… from the Hardware menu.
The Analog Inputs window displays.
2. Double-click on the appropriate row under the Label column for the analog input
that you want to rename.
Note
The analog input devices are labeled Analog Input 1 and Analog Input N by default, where N
equals the total number of analog inputs available to the GC.
3. Type in a new descriptive name for the analog input.
4. Click OK.
3.7.2 Set an analog input’s operational mode
An analog input has two operational modes: Variable and Fixed.
• Var_Normal: The analog input will be set automatically, based on the signal it
receives. This is the default setting.
• Var_Namur_NE43: Namur_NE43 uses the 3.8 to 20.5 mA signal range for
measurement information, with ≥21 mA or ≤3.6 mA to indicate diagnostic failures.
• Setting the switch to Fixed means that the analog input will be set to the value that
you enter in the appropriate row under the Fixed Value column.
To set an analog input’s operational mode, do the following:
1. Select Analog Input… from the Hardware menu.
The Analog Input window displays.
Hardware
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