AMC-DTM-Sensor Transmitter
- 19 -
5.4.5 Silence
Timer
This feature is used to silence an alarm and to temporarily deactivate its relay output. Alarm
LED and LCD displays are still shown.
The Silence Timer is adjustable from 0 to 99 minutes in steps of 1 minute. A timer value of 0
disables this feature, except when Minimum Run Time is infinite. An alarm can not be silenced
in advance – an attempt to silence an alarm just before it becomes active is ignored. Silencing
alarm again while the alarm is already silenced resets the Silence Timer to the default value of 0
minutes, effectively disabling the timer.
5.4.6 Minimum Run Time (Run Time)
After gas concentration decreases or increases to below or above the Threshold (subject to
hysteresis), alarm is kept turned on for an additional period of time, the Minimum Run Time.
Minimum Run Timer can be adjusted from 0 to 99 minutes in steps of 1 minute or set to infinite.
When set to infinite value, alarm can be cleared only by Silencing it (thereby requiring human
intervention).
Note: when the Minimum Run Timer is set to infinite, it is possible to silence the
alarm even if Silence Timer is set to 0.
5.5 Transmitter Options
These options apply to the whole unit as well as all three gas alarms.
5.5.1 Gas
label
Gas labels may have a maximum of 12 characters. The label is displayed on the first line of the
Gas Concentration Display. The operator can change the default label.
Note: It is considered good practice to include the gas type in the label name for example, “Cl2-
west wall”.
After the software has been loaded for the first time, the gas label reads “align me” indicating
that electrical alignment of the unit should be performed.
After the alignment has been completed, the label “align me” is changed to “configure me”.
If the unit is configured to one of the stored configurations (“log in”, “options”, “advanced”, “pre-
configs”) the label is replaced with the gas label and the name of the sensor chosen.
5.5.2 Hysteresis
The Hysteresis option is used to prevent multiple alarms that are produced by the oscillation of
the sensor signal around the threshold value. The Hysteresis value is the same for all three gas
alarms.
Increasing alarm triggers when gas concentration stays greater than the threshold value for
period of time equal to Activation Delay. Increasing alarm is deactivated when concentration
falls below the threshold minus the hysteresis value for period of time equal to Minimum Run
Time.
