Chapter 3: Programming the unit
LaserSense HSSD-2 Aspirating Smoke Detector Installers Handbook 45
Time and date
Numeric - Address 000-127: It is important that the time and date be set up
correctly on the controller’s internal calendar/ clock because it uses this
information to store events in the event log. Refer to “Event log” on page 55 for
more details. Units are supplied with the correct setting for UK time. This is
backed up with a rechargeable battery.
Alarm levels
Numeric - Address 001-127: The value set in the Pre-Alarm level , Fire 1 level
and Aux level functions in the Alarm levels sub-menu is the relatively-scaled bar
graph level at which the appropriate alarm is initiated on the detector. The Fire 2
level function assigns an absolutely-scaled alarm level in % obs/ft. or % obs/m
(as selected in configuration) to the Fire 2 alarm. The Aux level is set by factory
default at level 10, which means that this alarm will occur after the Fire 1 alarm.
Alarm delays
Numeric - Address 001-127: The alarm delay is the number of seconds that an
alarm level has to be continuously sensed before the alarm is initiated. Each
alarm level has a programmable delay of between 0 and 90 seconds.
ClassiFire override
Numeric - Address 001-127: When this function is set to a value other than
zero, the shorting together of one of the “Input 3” contacts on the detector main
circuit board by means of potential-free dry contacts will desensitise the detector
by moving the alarm levels out by the specified percentage.
ClassiFire alarm factor
0-8 - Address 001-127: The detector sensitivity is set with this entry, which will
also affect the probability of nuisance alarms. 0 = high sensitivity, higher
probability; 8 = low sensitivity, lower probability.
Note: The highest sensitivity setting is suitable for clean, environmentally
controlled environments, e.g., semiconductor manufacturing clean rooms where
airborne pollutants are kept to an absolute minimum and the least contamination
is cause for alarm. Use of this setting in a busy machine shop would lead to
relatively frequent nuisance alarms due to the normal variation of atmospheric
contamination, and a lower sensitivity setting is recommended. It is therefore
important that the alarm factor chosen is suitable for the area to be protected.
When the appropriate alarm factor for the protected area has been set, nuisance
alarms will be reduced to an absolute minimum.
To Next Page
Loading...
