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Rev. 2.1 7-7-2017
Copyright © 2017 by Cool Air Incorporated. All rights reserved.
Programming the 4-20 mA range
The ammonia level 4-20 mA signal can be scaled to one of three
ranges, either 0-1% (r.1), 0-2% (r.2), or 0-10% (r.3). To program
the 4-20 mA range, follow these steps:
1.
Open the detector enclosure and move the service jumper
to the “ON” position.
2.
Install the jumper on the jumper pins (labeled “SET1”)
located below the rotary switch on the front panel-mounted
circuit board.
3.
Set the rotary selector switch to position “3”. The display
will indicate the current range, either “r.1 (0 to 1% range),
“r.2” (0 to 2% range), “or “r.3” (0 to 10% range).
4.
Press the “UP” or “DOWN” button until the display
indicates the desired range.
5.
Press and hold the “ENTER” button for at least 2 seconds.
The new range is now programmed.
6.
Remove the jumper and return the rotary selector switch to
the desired position.
7.
Move the service jumper to the “OFF” position and close
the detector enclosure.
Setting the Service Mode Timeout
If the service jumper is not returned to off, you can change how
long the detector stays in service mode before returning to normal
operating mode.
With the SET jumper on and the Rotary Switch in position 4 you
can use the up and down buttons to select either;
1.5d – After 15 minutes in the on position the detector will return to normal
mode.
3.0d – After 30 minutes in the on position the detector will return to normal
mode.
4.5d – After 45 minutes in the on position the detector will return to normal
mode.
6.0d – After 60 minutes in the on position the detector will return to normal
mode.
Once you have selected the desired service mode timeout you must
hold the ENTER button for two seconds before removing the SET 1
jumper or changing the rotary switch.
