D12
EX-IR
Gas Transmitter with IR Smart Sensor
Dec 2019 ( 85-0004 Rev A)
47
Gas Alarm Operation
Figure 47 illustrates the operation of a high (rising) gas level alarm used for monitoring gases below their
LEL and TLV limits.
Figure 47. High Alarm Operation
Figure 48 illustrates the operation of a low (falling) gas level alarm that might be used for monitoring
gases above their UEL.
Figure 48. Low Alarm Operation
Rdg at set level
Alarm becomes active
Set Level
Res Level
Set Delay
Res_Delay
Rdg at reset level
Alarm becomes inactive
S e c o n d s
C
O
N
C
E
N
T
R
A
T
I
O
N
Rdg at set level
Alarm becomes active
Set Level
Res Level
Set Delay
Res Delay
Rdg at reset level
Alarm becomes inactive
S e c o n d s
C
O
N
C
E
N
T
R
A
T
I
O
N
