respectively. (You must adjust the probe's sensitivity (GAIN). See "Adjusting Probe Sensitivity" on
page 11.)
Stationary steel near the probe, but not over the probe, will not affect its operation. The probe can
be placed in a PVC pipe under the steel-reinforced grid of a concrete roadway without affecting its
operation.
Probes installed above ground should be mounted no higher than 2 feet above the road surface. If
the probe is attached to a wall or post, it should be mounted parallel to the ground and parallel with
the driveway. Rule of thumb: the vehicle must approach one end of the probe, not both at the same
time. If a car approaches both ends of the probe simultaneously (i.e., it is installed across, and not
parallel with, approaching traffic) the signal will be cancelled.
In drive-up window applications, install the probe at least 15 to 20 feet before the window.
I
NSTALLING
CT-6 P
ROBE
AND
C
ABLE
See Figure 3 on page 4. Typically, the probe is buried 6-10 inches below ground, beside, and
parallel to, the driveway. It is advisable to bury 6-10 feet of extra cable with the probe (coiled up) for
future maintenance or relocation.
When installing the probe in existing pavement, bore a 1.5 inch diameter hole vertically, 18 inches
deep. Slice the pavement from the bored hole to the driveway edge to accommodate the cable.
Install the probe and cable and seal with silicon.
When installing the probe within a dirt or gravel driveway, first bury a 2 inch schedule 80 PVC pipe
in the center of the driveway, 6-8 inches deep, and diagonally at a 45 degree angle (see Figure 3 on
page 4). Slide the probe and cable to the end of this pipe. This will make it easily retrievable in the
future.
When installing in new construction, bury the 2 inch PVC pipe under the driveway as described
above. Then pour cement or asphalt the drive. Insert the probe and cable after landscaping is
complete to prevent possible damage to the cable.
The probe cable is direct burial and does not require conduit. Depth of burial depends on lawn
conditions. In cultured grass, bury the cable 2-3 inches deep. The root system of the grass will
capture the cable for life. Use a lawn edger to slice a 1/4 inch wide trench across the lawn to the
location of the control unit. Push the cable to the bottom of the slice, fill, and tamp.
In uncultured field grass or in soil without cultured grass, bury the cable at least 6-8 inches deep.
When installing the cable through woods or above ground, run it in PVC pipe for mechanical
protection, as animals will chew through the cable if it is exposed.
When pulling the cable through conduit or PVC pipe, it is important that every inch of cable be
liberally lubricated. Use a wire lubricant, and pull only 100 feet or less at one time. The cable is
coated with polyurethane and therefore has extremely high traction. This can cause a tremendous
drag when not lubricated; enough to inconspicuously snap wires inside the rubber casing. Therefore,
make sure you lubricate it when pulling it through non-magnetic conduit or PVC pipe.
Also, the polyurethane coating on the probe cable demands that extreme care be taken when
unrolling it. To unroll, put your arm through the center of the roll, remove the tape, and unravel the
roll one wrap at a time. Once you begin unrolling the cable, do not lay it down before you are
finished or it could become irreparably tangled.
Note: Because the cable is fully shielded, it can be buried in the same trench (but not the same
conduit) in which there are water, power and telephone lines, if codes permit. Check all electrical
codes, both locally and nationally.
5
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