Installation Methods
Adjacent to Roadway (Recommended Method) In a Roadway
1. Temporarily place the probe parallel to the
roadway (driveway) in the desired location.
1. Position the probe in the center of the
roadway, perpendicular to the direction of
traffic. The probe should be located at a
minimum of 5cm deep in concrete or asphalt.
• If installing the probe prior to paving a hot
asphalt roadway, the VMD202 and its lead
cable need to be insulated. A common
method to do this would be to dig a small
trench and bury the probe and lead cable in
10cm of sand prior to paving.
(DO NOT APPLY
HOT ASPHAULT DIRECTLY AGAINST
PROBE AND LEAD CABLE!)
• If installing the probe in concrete, make sure
it is installed above the rebar.
• The probe may be positioned prior to paving
or a cut may be made in the finished
pavement for installation.
2. Connect the power, VMD202 remote control, output relay contact and earth ground to the
intended equipment. (Reference EARTH GROUND CONNECTION in Wiring Connections.)
DO NOT EXCEED 39 VDC or 27 VAC.
3. Apply power and allow 5 minutes of warm-up for system stabilization.
4. Set sensitivity to 0.
5.
Drive a vehicle at a minimum speed of 8 km/hr passed the probe and to the far side of the roadway.
6. Repeat step 5 while gradually increasing the sensitivity until the system detects the vehicle.
•
•
7.
7. Installation in roadway complete.
For instances of high pedestrian traffic, heavy animals or heavy vehicles, bury the probe
60 cm deep to prevent false triggering in either installation method.
TIP:
TIP:
TIP:
15m CABLE
GATE OPENER
JUNCTION BOX “BY OTHERS”
VMD202 PROBE
BURIED 20-30 CM DEEP
SENSING AREA - APPROX. 3.5M
DIAMETER CIRCLE AROUND PROBE
A higher sensitivity setting than required to detect the vehicle makes the system more
vulnerable to triggering from unintended sources such as movement of other objects,
including bicycles, horses, small vehicles, metal in shoes or other electrical disturbances.
When the detector is set to maximum sensitivity (full counterclockwise on the sensitivity
adjustment) detection distance is approximately 3.5m at a speed of 8 km/hr. At higher
speeds, 15-20 km/hr, detection distance can exceed 3.5m.
Bury the probe at this location approximately
20-25 cm deep for typical applications. Repeat
the previous sensitivity check (steps 4-5) to
verify proper operation. Installation is adjacent
to roadway complete.
