Perimeter layout guidelines
FlexPS Product Guide
Page 17
Non-sensitive lead-in cable (MEX sensor cable)
Non-sensitive lead-in cable is almost identical to MEX sensor cable, but does not detect vibrations.
Lead-in cable is available in lengths of 30 m (98 ft.), 150 m (492 ft.) and 300 m (984 ft.). It allows
you to install the processor away from the start of the sensor zone, and is also used to bypass
gates, buildings, and other structures (see
). The recommended maximum length of
lead-in cable for a zone with 300 m of sensor cable is 150 m (492 ft.). This length can be extended
for zones that use shorter lengths of sensor cable (e.g., a zone with 200 m of sensor cable can use
up to 250 m of lead-in cable).
Non-sensitive lead-in cable (Mark 2 sensor cable)
For Mark 2 sensor cable, standard coaxial cable is used for lead-in cable and bypasses. The
length of non-detecting cable that can be used with Mark 2 is determined by the coaxial cable’s
capacitance. The following table includes the approved coaxial cable types that may be used as
lead-in cable with Mark 2 sensor cable, and the maximum lead-in lengths.
The maximum length of non-sensitive cable is based on a zone with 300 m of Mark 2 sensor
cable. The length of non-detecting cable may be extended, provided the length of the Mark 2
sensor cable is reduced accordingly.
Gate bypass
If there is a gate within a FlexPS sensor zone, you require a sufficient amount of lead-in cable to
bypass the gate, even if the gate is protected by sensor cable. Bury the bypass cable in PVC
conduit. See
for an example of a bypassed gate, which uses a microwave system to
provide security across the gate.
Gate bypass modules
The gate bypass module is used to bypass a protected gate without triggering an intrusion alarm.
Refer to instruction sheet G5DA0103 for detailed installation instructions for the gate bypass
modules. See
and
for illustrations of gate bypass modules.
Non-sensitive cable type
Maximum length
RG-59/U, 69 pf/m (21 pf/ft.)
116 m (380 ft.)
RG-62/U, 43 pf/m (13 pf/ft.)
186 m (610 ft.)
