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(3)
Set the maintenance switch to the center position (normal operation mode).
5. Install the sensor unit if it is not installed yet. For installation procedure, refer to 9-2.
“Sensor
Unit Installation/Replacement
”. Ensure the main unit power switch is in the OFF position
before sensor unit/main unit installation.
6. Install the main unit to the base unit. For installation procedure, refer to 6-2.
“Unit Installation
Procedure
”.
To center position (normal mode)
Trimmer (adjustment screw)
Rotate the trimmer with a slotted screwdriver to adjust
the MNT2 output level.
+ G
H
NOTE
Oxygen sensor
(COS-7, FS: 50vol%)
Toxic gas sensor (CDS-7)
Combustible gas sensor
(CHS-7)
Oxygen sensor
(COS-7, FS: 25vol%)
Analog output
20mA
Gas level
4mA
0mA
Full scale
0ppm
Normal air has an O
2
level of
21vol%. Adjust to 17.4mA.
Analog output
20mA
O2 level
4mA
0mA
25vol
%
0
%
17.4mA
21vol
%
Normal air has an O
2
level of
21vol%. Adjust to 10.7mA.
Analog output
20mA
O2 level
4mA
0mA
50vol
%
0
%
10.7mA
21vol
%
Lift the cover flap open.