Ametek CEM/Humox, User Manual

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Controller/User Interface
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4-19
Select an Analog Output Port
Before you can define any Analog Range key functions, you must first choose
whether they will apply to analog output ports 1, 3, or 4 on the wiring card of the
control unit. Analog output port 1 is labeled I OUT 1; analog output port 3 is labeled
I OUT 3, and analog output port 4 is labeled I OUT 4 on the wiring card. Analog
output 2 is reserved for furnace control, and is therefore not available.
Do the following to select an analog output port:
1. Select the Analog Range key.
2. Select Current Output #1, Current Output # 3, or Current
Output # 4.
You can then select any of the menu options described in the remainder of this
chapter, and they will apply to your selected analog output port.
Set Current Range
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 correspond 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” sec-
tion later in this chapter for the types of readings the current output can represent).
See the “Set Current Mode” section for help on choosing either a 0 to
20 mA or 4 to 20 mA scale.
To set the range of readings that the selected current output represents, do the fol-
lowing:
1. Select Set Current Range from the Analog Range key menu after selecting an
analog output port.
You will be prompted to define the new value to correspond to the 20 mA analog
output:
Out # y 20 ma = xx
New Value?
NOTE
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