Ametek Thermox TM2000, Руководство пользователя

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4-22 | Thermox TM2000 Oxygen Analyzer
Set Current Range Option
This menu option allows you to define the range of readings that the
0-to-20 or 4-to-20 mA (milliamp) output will represent. You can also
choose to set a reverse analog output range, so for example, 0 mA can cor-
respond to the high end of the oxygen range, and 20 mA can correspond
to the low end of the oxygen range.
The range of readings the current output represents is also a function
of what type of process readings the analog output port tracks (see the
“Select Function” section later in this chapter for the types of readings the
current output can represent).
Setting the current range
To set the range of readings that the selected current output represents:
1. Select Set Current Range from the Analog Range Key menu after
selecting an analog output port.
2. If tracking oxygen, select whether you want to enter the 20 mA value
using a percent or PPM range.
You will be prompted to define the new value to correspond to the 20 mA
analog output:
Out # y 20 ma = xx
New Value?
where y is the analog output port, and xx is the present value that the cur-
rent output currently represents (for example, 10 % O2). Although we use
output port #1 for this example, the output port that will appear depends
on the analog port you selected.
3. Type the value to correspond to the 20 mA analog output.
4. If tracking oxygen, select whether you want to enter the 0 or 4 mA
value using a percent or PPM range.