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H – H mode (1
st
level: Upper limit, 2
nd
level: Upper limit)
Normal state (No gas is detected)
L – L mode (1
st
level: Lower limit, 2
nd
level: Lower limit)
Normal state
H – L mode (Upper limit, Lower limit)
Normal state
* A2 value should be always greater than A1 value.
25vol%
21vol%
1
st
level alarm : ALARM 1 is displayed.
A
larm contact ZA1 is activated.
A
larm value is set b
y
enterin
g
A2 **
0 vol%
2
nd
level alarm : ALARM 1 , ALARM 2 is displayed.
A
larm contact ZA1 and ZA2 are activated.
A
larm value is set by entering A1 **
0ppm
Full Scale
2
nd
level gas alarm : ALARM 1 , ALARM 2 is displayed.
A
larm contacts ZA1 and ZA2 are activated
A
larm value is set by entering A2 **
1
st
level gas alarm : ALARM 1 is displayed.
A
larm contact ZA1 is activated
A
larm value is set by entering A1 **
Upper alarm : ALARM 2 is displayed.
A
larm contact ZA2 is activated.
A
larm value is set b
y
enterin
g
A2 **
50vol%
21vol%
0 vol%
Lower alarm : ALARM 1 is displayed.
A
larm contact ZA1 is activated.
A
larm value is set b
y
enterin
g
A1 **