BT CGA-411 Operation Manual page 30

To Change the Alarm Level for the CO Display to 35 PPM CO. Set the front panel
switch to AUTO ZERO and press switch #2 five times. The display will advance to CO
followed by a number (the current alarm level). Continue by
Press
Switch #1
Switch #2
Switch #2
Switch #1
Switch #2
Switch #1
Switch #2
Switch #1
Switch #2
Exit by placing the front panel switch to a position other than AUTO ZERO.
Display
ON
0200
0200
0000
0000
0030
0030
0035
CO followed by 35
Underlined digit is flashing
Underlined digit is flashing
Continue pressing switch #1 until
0 appears at the second digit
Continue pressing switch #1 until
3 appears as the third digit
Continue pressing switch #1 until
5 appears on the last digit
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