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Rev. 11-5 12/15/2020
Copyright © 2020 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 four
ranges, either 0-100 PPM, 0-250 PPM, 0-400 PPM, 0-500 PPM, 0-
800 PPM or 0-1000 PPM. The 0-250 PPM range is the default
setting.
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 “r100”, “r250”,
“r400”, “r500”, “r800”, or “r1E3” (1000 PPM 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.
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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 1 jumper on and the Rotary Switch in position 4 you
can use the up and down buttons to select either;
15d – After 15 minutes in the on position the detector will return to normal
mode.
30d – After 30 minutes in the on position the detector will return to normal
mode.
