Page 4
Figure 1 - Measuring Lane Width from the Kerbside
6.1.3 Terminate the loop feeder cable in the bottle joint. Connect the sensor
cable to the bottle joint. The sensor is not polarity sensitive. Close the bottle
joint in accordance with the manufacturer’s instructions. Coil the sensor cable
and draw cord to allow it to run freely. Ensure that any sensors already in the
duct have their draw cords and cables retained so that they are not displaced
during fitting of later sensors.
Where using legacy loop feeders, it is possible to common all the RTM300
cable low sides onto one core. See Appendix 2.
6.1.4 Using a push rod or other flexible guide, push the sensor down the duct
maintaining a constant positive force until the draw cord mark lines up with
the end of the duct. A recess is provided in the potting of the sensor to help
locate the push rod. When the sensor is in place withdraw the push rod and
make the draw cord off within the pit, preferably attaching it to the pit wall or
other fixed location.
6.1.5 Check the bottle joint to ensure that it is watertight and make the pit tidy
before closing it.
6.1.6 When all sensors are installed, return to the controller cabinet and fit the
interface cards in accordance with section 6.2 below.
NOTE: During subsequent site activity additional new cables may be
installed or existing cables may be replaced if damaged. After any such
operation that affects the duct, the sensor may move leading to a
possible unintended detection and a loss of position. To alleviate this, it
is recommended that once installed, the sensor cable should be
secured to the end of the duct with a tie wrap to prevent any movement.
Pit
Lane Width
at Kerb line
Setback
Intended
sensor
position
