ATI Model F12/D Gas Transmitter Part 4 – Operation
57
O&M Manual (Rev-H)
Alarm Inhibit
Alarms are inhibited to temporarily disable (false) activation and should be re-enabled as soon as
possible to maximize the safety of the area. The duration of inhibit period depends the method used to
activate it. For example, alarm inhibit occurs automatically during zero and span calibration and expires
after 30 minutes. The table below summarizes the duration of the alarm inhibit periods for each method
used to initiate it.
Table 3. Alarm Inhibit Periods
(same as Sensor Install below)
Set immediately on entering the method
Then for up to 30 minutes after pressing a key while
in the method
5 minutes during gas generation attempt
10 minutes during recovery period
60 seconds, then Trouble alarm active
Alarm inhibit active during sensor warm-up (usually
5 minutes)
Manual activation from Main Display using Esc
key
Duration value in Alarm Inhibit Menu
Manual activation by Start in Alarm Inhibit
menu
Duration value in Alarm Inhibit Menu
The Main Display indicates when alarms are inhibited (see Status Indicators in Figure 35
on page 34), and the 4-20mA output is fixed at the Inhibit mA (see below).
The most convenient method for manually starting alarm inhibit is from the Main Display. For more
information on that method, see Inhibiting Alarms from the Main Display on page 35. Alarm inhibit may
also be started through the Alarm Inhibit Menu, shown below.
Alarm Inhibit Menu
The Alarm Inhibit Menu exposes the manual alarm inhibit start and stop control, and the duration and
fixed 4-20mA setting.
Set the fixed value of the 4-20mA output during alarm
inhibit (3.5 to 22.0 mA). This is normally 4mA for toxic gas
sensors, and 17.4mA for oxygen sensors.
When alarm inhibit is off: Set the manual alarm inhibit
period (0-60, default=15 minutes).
When alarm inhibit is on: Adjust the amount of time
remaining.
Start (or stop) alarm inhibit
Figure 72. Alarm Inhibit Menu
>Menu >Setup >Alarms >Inhibit
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