Edwards LaserSense HSSD-2

Chapter 3: Programming the unit
46 LaserSense HSSD-2 Aspirating Smoke Detector Installers Handbook
Table 4: Suggested Settings for ClassiFire Alarms
Alarm
factor
Sensitivity Probability of
nuisance alarm
Suggested protected area
0 Extremely
high
Once per year Semiconductor manufacturing clean room
1 High Once per 5 years Computer room
2 High Once per 10 years Non-smoking office
3 High Once per 50 years Clean factory
4 Medium Once per 1,000 years Warehouse
5 Medium Once per 5,000 years Warehouse with diesel trucks operating
6 Medium Once per 10,000 years Warehouse with diesel trucks operating
7 Low Once per 20,000 years Warehouse with diesel trucks operating
8 Low Once per 100,000 years Warehouse with diesel trucks operating
Hour start of day and night operation
Note: This information is provided as general guidance only. The installer is
responsible for assessing the environment and determining the appropriate
sensitivity of the ClassiFire alarm.
0-23 - Address 001-127: These values are the times to the nearest hour at
which the day/night switching is desired to take place on the detector. Entries are
made in 24-hour format, e.g., 19:00 for 7pm. If no day/night switching is required,
then both entries should be set to 00:00. Day and night switching is intended so
that the detector may automatically select a different sensitivity when the
protected area is unoccupied and fewer contaminants are being produced.
ClassiFire automatically detects the change in smoke level after the protected
area is left, and if the time at which this happens is within +/– 70 minutes of the
programmed switchover time, it selects the nighttime histogram.
Note: If the environment actually becomes more contaminated during the night
period, then ClassiFire will adapt to that too, reducing the nighttime sensitivity.
The system will automatically compensate for 1 hour seasonal time changes.
LDD enable
Yes/No - Address 001-127: When this function is set to Yes , Laser Dust
Discrimination (LDD) increases the response time of the detector slightly, while
greatly reducing the likelihood of nuisance alarms due to dust ingress. LDD may
be disabled in very clean rooms for a slightly faster response to smoke by setting
this function to No. Disabling LDD is not recommended for areas other than
manufacturing clean rooms, due to the increased probability of nuisance alarms
in most other operating environments.