ATI Technologies d12 series - Gas Alarm Operation; Figure 46. Rising Alarm (Active=Above_Sp, Reset=Auto); Figure 47. Falling Alarm (Active=Below_Sp, Reset=Auto)

ATI Series D12 Toxic Gas Transmitter with H10 Smart Sensor
Revision N (7/15) 50
Gas Alarm Operation
Figure 46 depicts relationships between variables associated with a rising gas alarm, and how they
function in the presence of a gas leak, and recovery.
Figure 46. Rising alarm (Active=ABOVE_SP, Reset=AUTO)
Figure 47 depicts relationships between variables associated with a falling gas alarm (such as for
Oxygen deficiency), and how they function in the presence of a gas displacement, and recovery.
Figure 47. Falling alarm (Active=BELOW_SP, Reset=AUTO)
Conc. at Set Point
Alarm Becomes Active
Set_Point
Res_Point
Set
_Delay
Res_Delay
Conc. At Reset
Alarm Becomes Inactive
S e c o n d s
C
O
N
C
E
N
T
R
A
T
I
O
N
Conc. at Set Point
Alarm Becomes Active
Set_Point
Res_Point
Set_Delay
Res_Delay
Conc. at Reset Point
Alarm Becomes Inactive
S e c o n d s
C
O
N
C
E
N
T
R
A
T
I
O
N