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(2)
(3) Set the maintenance switch to the center position (normal operation mode).
(4) Perform zero/21% adjustment again by repeating the steps (1) to (3) at the following
timing: 24 hours after powering-up for toxic gas and oxygen
7 days after powering-p for combustible gas
14. Affix the target gas sticker to the front (visible location) of the detector.
Press the ZERO button for more than 2
seconds. The green POWER LED will
flash one time, indicating the zero
adjustment is completed.
Press the SPAN button for more than 4
seconds. The green POWER LED will
flash one time, indicating the zero
adjustment is completed.
Oxygen sensor (COS-7)
Toxic gas sensor (CDS-7)
Combustible gas sensor (CHS-7)
POWER LED
ZERO button
SPAN button
Set to the center position
Lift the cover flap open.
Gas concentration with
unit of measurement
(%LEL, ppb, or ppm)
Target gas sticker
Flow rate icon quickly
spinning
Green POWER LED is on.
Amber TROUBLE LED is off.
Red ALARM LED is off.
In normal operation with no alarm
