ATI Series D12 Toxic Gas Transmitter with H10 Smart Sensor
Revision N (7/15) 52
Active=ABOVE_SP
Upper limit = current set point value
Lower limit = lowest set point value
Active=BELOW_SP
Upper limit = highest set point value
Lower limit = current set point value
When the set point is reprogrammed, the reset point value is
reprogrammed to the same value.
Reset
The Reset variable defines how the alarm is permitted to transition from
active, to inactive. When the variable is set to AUTO, the alarm will
transition without operator intervention, as soon as conditions permit
(concentration reaches the reset point, and the reset delay period expires).
When the variable is set to MANU, the alarm conditions must have
subsided, and an operator must acknowledge the alarm manually, through
the operator interface, the serial interface, or through the remote reset
(see Electrical Connections, page 12).
Note: Res_Delay is operational for AUTO only. Setting the Reset variable
to MANU suppresses display of the Res_Delay variable.
Fault_Goto
The Fault_Goto variable specifies alarm behavior during transmitter faults,
and overrides all other alarm settings. If the fault alarm should become
active, you may program the concentration alarm to behave in one of three
ways:
HOLD - the transmitter will attempt to hold the alarm in its current state. If
the alarm is active, it will remain active. If the alarm is inactive, it will be
inhibited from becoming active until after the fault is cleared.
SET - activates the alarm immediately, the set delay period is ignored.
This feature permits the alarm to signal both concentration and fault
conditions.
RESET – deactivates the alarm immediately, the reset delay period is
ignored.
Set_Delay
The set delay variable is used to configure the amount of time in seconds
that the concentration must be in the alarm active region before becoming
active. It may be used to avoid triggering alarms on relatively short gas
exposures. Also, it may be used to help prevent alarm relay chattering
when the concentration level is varying between the set point and reset
point. The variable may be programmed between 0 (its default) and 10
seconds.
Res_Delay
The reset delay variable is only displayed when the Reset variable is set to
AUTO. It is used to configure the amount of time in seconds that the
concentration must be in the alarm inactive region before becoming
inactive. Like the set delay variable, it may be used to help prevent alarm
relay chattering and is preferred over using set delay. The variable may
be programmed between 0 (its default) and two hours (7200 seconds).
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