Perimeter layout
OmniTrax Product Guide Page 53
Minimum sensor cable lengths
For standalone OmniTrax processors (i.e., processors that are not connected to other processors
through decouplers) the absolute minimum length of sensor cable is 16 m (52 ft.). This includes
the required minimum 6 m (20 ft.) of lead-in cable and the 4 m (13 ft.) start-up section of cable in
which the detection field builds up to full strength.
For OmniTrax processors that are connected to other OmniTrax processors through decouplers,
the minimum sensor cable length is 75 m (246 ft.) per processor; i.e., total cable length separation
between two processors is 150 m (492 ft.) including 6 m of lead-in cable per processor and the 4 m
(13 ft.) start-up section of cable in which the detection field builds up to full strength.
Figure 25:
illustrates the absolute minimum cable lengths for lead-in cable and detecting sensor cable
(connected through decouplers and terminated).
These minimum sensor cable length rules apply to all sensor cable types used with OmniTrax,
including retrofit applications to Perimitrax or Sentrax sensor cables.
Cable selection guidelines
Figure 25: Minimum required sensor cable lengths
Note Typically, the maximum usage from an OmniTrax cable set is 95% of
the total cable length (e.g., a 400 m OmniTrax cable set will cover
approximately 380 m of perimeter). This is due to environmental factors
like uneven terrain, and to compensate for minor installation variances
when laying the cable. Therefore, when designing an OmniTrax
perimeter, you should plan on using approximately 5% more sensor
cable than the total length of the perimeter.
Note If site conditions require you to shorten the lead-in cable, the absolute
minimum length of lead-in cable is 6 m (20 ft.). As a precaution, Senstar
recommends retaining at least 10 m of lead-in cable on each OmniTrax
sensor cable.
Note Each sensor cable includes at least 4 additional meters of detecting
cable, which allows the detection field to build to full strength.
Note - OC2, SC2 Install the TX cable on the outside of the perimeter, and the RX cable on
the inside.
10 m (33 ft.)
decoupler
10 m (33 ft.)
69 m (226 ft.)
69 m (226 ft.)
lead-in cable
6 m (20 ft.)
lead-in cable
6 m (20 ft.)
lead-in cable
6 m (20 ft.)
lead-in cable
6 m (20 ft.)
detecting cable
detecting cable
minimum sensor cable lengths:
cables connected through decouplers
6 m lead-in + 69 m detecting = 75 m cable
terminated sensor cables
6 m lead-in + 10 m detecting = 16 m cable
(not connected to other cables)
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