ATI Series D12 Toxic Gas Transmitter with H10 Smart Sensor
Revision N (7/15) 58
Inhibiting Alarms
Alarms should be inhibited to prevent false activation, such as done just prior to “bump-testing” the
sensor.
The most convenient method for temporarily inhibiting alarms is from the Main Display. Hold the
magnet over the ESC key for 2 seconds, and remove it. This will toggle the alarm inhibit mode on for
15 minutes, which will clear and inhibit alarms, hold the current loop at 4mA (17.4mA for Oxygen
sensors), and cause the “I” and “L” status indicators to appear. Repeating the procedure toggles alarm
inhibit mode off immediately, restores the current loop to normal operation, and clears the “I” and “L”
status indicators. Both the inhibit duration, and loop output, are programmable and may be accessed on
the Alarm Inhibit setup page (see below).
Figure 54. Inhibiting alarms from the Main Display
Alarm Inhibit Setup
Variables and controls associated with the alarm inhibit mode are accessible on the Alarm Inhibit setup
page (below), and are detailed in Table 11.
Figure 55. Alarm inhibit setup page
Table 11. Alarm inhibit variables and controls
Inhibit_mA
The Inhibit_mA variable is output on the current loop during alarm inhibit. It ranges from 3.5
to 22.0 mA (this is the same value that appears on the 4-20mA Setup page).
Inhibit_Time
Alarm Inhibit Off
The Inhibit_Time variable is the duration of the alarm inhibit mode, and is programmable
from 00:00 to 99:59 (mm:ss).
Alarm Inhibit On:
The variable counts down from its programmed duration. Selecting it temporarily freezes
the count and permits it to be scrolled up and down. If Enter is touched, counting resumes
from the new value. If Esc is touched, counting resumes at the previous value. These
changes are temporary, and are not saved as the programmed value.
Start (Stop)
The Start function turns on alarm inhibit, which clears and inhibits alarms, holds the current
loop at 4mA (17.4mA for Oxygen sensors), causes the “I” and “L” status indicators to
appear, and starts the Inhibit_Time variable to begin ticking down. The label then changes
to “Stop”, and selecting it again turns off alarm inhibit, restore the current loop to normal
operation, clears the “I” and “L” status indicators, and restores the Inhibit_Time variable to
its programmed value.
►Inhibit_mA= 4.0
Inhibit_Time=
15:00(mm:ss)
Start
>Menu >Setup >Alarms >Inhibit
PPM
H2S
Main Display
Esc
2 Seconds
PPM
H2S
Main Display
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