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2-4 Changing the Alarm Settings
The values of alarm settings on this unit can be changed. The method for changing them is explained
here.
(1) Release the password lock. (Refer to 1-2 Releasing the Password Lock.)
(2) Press the AL switch until the alarm setting
to be changed is displayed on the LCD display.
(The bottom right of the screen, as in the table below.)
The alarm setting for the actual gas concentration is
displayed in the middle of the screen, and the
percentage of the full scale value is displayed in the
bottom right corner
LCD Display
Indication
(Lower right)
Default value
Explanation of
the default value
Adjustable
Range
Toxic : CDS-7
Comb. : CHS-7
A1 10
10% F.S.
A1 **
Oxygen: COS-7 A2 72
72% F.S.
0 to 100% F.S.
Toxic : CDS-7
Comb. : CHS-7
A2 20
20% F.S.
A2 **
Oxygen: COS-7
A2 76
76% F.S.
0 to 100% F.S.
* Pressing the AL switch changes to 1st level
Æ
2nd level
Æ
Normal display.
* The A2 value should be greater than the A1 value in any case.
(3) Press the special command switch.
The setting to be changed and the “—“
indication will then flash alternately.
(4) Change the value by using the UP/DOWN key “U” and”V”.
When you are done, press the special command switch again, and the alternating display in the lower
right corner of the LCD display will become constant. The process is now finished.
(5) When this is finished, press the UP/DOWN switches (“
U
” or”
V
”) again to return to the normal display.
Note
The relationship between 1
st
level and 2
nd
level alarm values of each alarm mode is as follows:
A
L switch
The percentage of the full scale value
Gas concentration
- - - - -
A
1 10
Special
command
switch
UP/DOWN switches