Brooks Firetracker FT128 CIE - Pulse up - down Counter; Pulse up - down Counter for Smoke; Pulse up - down Counter for Temperature

Technical / Programming Manual
FT128 Rev 2.2
128
Alarm algorithms for the following areas can be adapted:
There is also a Heater area Alarm algorithm. This is similar to the alarm algorithm for the
Normal area but the rate-of-rise function (deltaT) is not used for alarm activation.
16.1 Pulse Up – Down Counter
The detector has a "pulse up – down counter", starting at "0" and cannot be negative.
16.1.1 Pulse Up – Down Counter For Smoke
When the smoke obscuration S (%/m) > the alarm threshold level, "1" is added to the
counter (every second).
When S < the alarm threshold level, "2" is subtracted from the counter (every second).
16.1.2 Pulse Up – Down Counter for Temperature
When the temperature T (°C) > the alarm threshold level, "3" is added to the counter (every
second).
When the temperature rise deltaT (°C/168sec.) > the alarm threshold level, "3" is added to
the counter (every second).
When T or deltaT < the alarm threshold level, "2" is subtracted from the counter (every
second).