ATI Model F12/D Gas Transmitter Part 4 – Operation
53
O&M Manual (Rev-H)
Select how the alarm is reset as Manu or Auto. When set to Auto, the alarm will
Reset (clear) without operator intervention, as soon as conditions allow (concentration
reaches Res Level, and the Res Delay period expires). When set to Manu, the
operator must reset the alarm manually after conditions subside, through the operator
interface, the serial interface, or through the remote reset (see Figure 23 on page 24 ).
Note: Res Delay is meaningful only when Reset= Auto. Setting Reset to Manu
suppresses display of the Res Delay setting.
Specify the alarm state during Trouble alarms. This setting specifies alarm behavior
during transmitter faults, and overrides all other alarm settings. If the trouble 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 Trouble is cleared.
Set - activates the alarm immediately (the Set Delay period is ignored). This
feature permits the alarm to signal both concentration and trouble conditions.
Reset – deactivates the alarm immediately (the Res Delay period is ignored).
Configure the amount of time, in seconds, that the gas concentration must be at or
above a high alarm set level, or at or below a low alarm set level, before the alarm
becomes active. This is used to avoid triggering alarms on relatively short gas
exposures. The setting may be programmed between 0 (its default) and 10 seconds.
Configure the amount of time, in seconds, that the gas concentration must be below a
high alarm reset level, or above a low alarm reset level, before the alarm becomes
inactive. The setting is typically used to keep relays energized to maintain exhaust
fans after a gas leak. The setting is displayed only when Reset is set to Auto, and
may be programmed between 0 (default) and two hours (7200 seconds).
Trouble Alarm
Trouble alarm are presented on the Main Display as shown below. When active, new alarms are
inhibited, and (by default) active alarms are held so that relays controlling lights, sirens, and fans may
continue to operate (this behavior may be modified on the Alarms Menu
(see pg 48). Certain Trouble alarm causes, like a temporary bus fault, may
clear automatically without operator intervention. Others, such as a missing
sensor, will not clear until corrected.
Figure 70. Trouble Indication on Main Display
Trouble Status Display
The Trouble Status Display appears by selecting the Trouble indicator from the Main Display. It may also
be viewed by selecting MENU from the Main Display when the Trouble alarm is active, then selecting View
Trouble. The 8-digit hex code on line 2 represents all active faults and is useful when obtaining help
from the factory. Select Next Problem to view a description of each problem in succession on line 3.
Some problems listed in Table 2 (on page 55) are cleared after pressing Esc
to return to the previous display.
Figure 71. Trouble Status Display
00000020
Sensor Removed
…Alarm Active>View Trouble
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