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Signal-10 Operation Principles

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Alarm Integration Time

The time interval, during which short-time loop resistance changes are not considered as its breaking

and don’t lead to any alarms (that is, the Alarm Integration Time), is equal to or less than:

− 50 ms for an intrusion alarm loop if the 300-ms Integration Time parameter is set off for this

loop

− 250 ms for other alarm loops and those intrusion alarm loops for which the 300-ms Integra-

tion Time parameter is on

The time interval, after expiration of which resistance changes of a loop are considered as its breaking

and cause the Signal-10 to generate alarms, is equal or more than:

− 70 ms for an intrusion alarm loop if the 300-ms Integration Time parameter is set off for this

loop

− 300 ms for an intrusion alarm loop or Auxiliary alarm loop if the 300-ms Integration Time pa-

rameter is set on for this loop

For alarm loops of the Types 1, 2, 3 breaking the loop causing the device to generate an alarm can

lasts from 300 ms to 3 s depending on transient processes occurring within the loop. If high capacity

detectors are included into the alarm loop, the Alarm Integration Time increases inversely to transient

process rate. The minimum loop voltage change rate corresponding to maximum Alarm Integration

Time is 0.5 V/s.

Powering Detectors over Alarm Loops

The Signal-10 supplies power over alarm loops to two-wire fire and intrusion detectors. The number of

detectors to be included in a single alarm loop is calculated by formula:

N = Im / i , where:

N is the number of detectors in the alarm loop

Im is the maximum load current

Im = 3 mА for alarm loops of Types 1, 4, 6, 7, 11, 12 and Im = 1.2 mА for alarm loops of Type 2

i is the current in mA consumed by a detector in quiescent mode

If an alarm loop of the Type 1 (fire smoke) is in use, fire detectors must keep their operability upon lowering the

voltage until 12 V.

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