SMS SenTRI2, Installation Instructions Manual, Page: 12 / 44

12
Loop Card
Loop circuit design
It is important that redundancy is built into the system to
accommodate for future expansions and change of area usage in the
protected premises.
The number of devices on a loop circuit can be limited by the total number of
addresses available, the electrical load on the circuit, the maximum cable length and
other geographical considerations.
†
A loop circuit must not cover more than 10,000m
2
of floor area of a protected site
†
In total a maximum of 200 devices are allowed per loop circuit .
Loop Card
The panel is supplied with one Post Sept 2014 enhanced Loop Card
(SENTRI4-LPC-EN). If more than one loop is required then acquire additional cards for
each additional loop for installation in card slot.
Condition of use of Loop Card
†
Up to 2Km loop length is possible with Sensor Sounder Strobe and Sounder
Strobe Mark 2 devices installed on a loop circuit. In this case a rough method for
calculating the loop load and loop cable length is shown in the leaflet for the loop
card. For a precise loop load and battery standby calculation use the ‘Battery
Standby and Loop load calculator’ tool.
†
Up to 2Km loop length is possible with 782XX-XXNM range of Sensor Sounder
devices or a mix of 782XX-XXNM range of Sensor Sounder Strobe and Sounder
Strobe Mark 2 installed on a loop circuit. Again for precise loop load and battery
standby calculation use the ‘Battery Standby and Loop load calculator’ tool.