DOD PS-7 - Manual (Page 3)

2 Changing Settings
2-1 Span Adjustment
(1) Set to maintenance mode (MNT1 or MNT2).
(2) Release the password lock. (Refer to 1-2 Releasing the Password Lock.)
(3) Press the SPAN switch.
(4) Let the calibration gas through.
(5) Use the UP/DOWN switch to adjust the concentration indication on the screen to that of the calibration
gas concentration.
(6) Once adjustments have been done, press the SPAN
switch again. The SPAN indication in the bottom right of the LCD
screen will go off, and the span adjustment will be completed.
(7) Remove the calibration gas, check that the detected gas concentration is under that of the alarm value,
and restore to the normal mode (by switching the maintenance switch to the center).
Toxic gas sensor unit : CDS-7
Combustible gas sensor unit : CHS-7
Pull back to open
Left: Maintenance 1 (MNT1)
Center: Normal mode
Right: Maintenance 2 (MNT2)
TROUBLE lamp (yellow) blinks.
MNT1 or MNT2 is displayed at the
bottom of the LCD screen.
The “__” indication and the
concentration value of the detected
gas blink alternately.
SPAN is displayed at the bottom
right of the LCD screen.
SPAN switch
UP/DOWN switch