ImpulseRadar PinPointR User Manual V1.5.1
Page 9 (36)
Note:
for safety, you are advised to engage the wheel brake any time the system is not under your
direct control, especially when working on a gradient.
GPR unit removal procedure
The following sequence is illustrated below in
1.
Grip the wheel encoder connector as the picture shows and pull it out.
2.
Remove the two rear and the front straps from the snap connectors and lift the cart-hood.
3.
Disconnect the M5 screws that hold the GPR unit to the tray and slide the GPR unit out from
the skid tray.
4.
Close the push-cart hood and refit the rear and front straps into the snap connectors.
5.
Adjust the front and back straps to obtain the desired height.
6.
Connect the odometer cable again to the socket with the black bezel.
Note:
before lifting the push-cart hood, remember to disconnect the odometer cable first. Also, it is
essential to loosen the front strap to avoid tension on the strap connection point.
Figure 6
GPR unit fitting and height adjustments
Odometer (wheel encoder)
When the push-cart is moved over the survey area, the distance travelled is measured using an
odometer (wheel encoder), via a connection to the rear-right wheel. This odometer is also used to
trigger the GPR measurement process. Depending on the model you have, the odometer mechanism
may be via a belt drive (o-ring) or direct-drive. Older models use the belt-drive, where the odometer
is located above the centre of the wheel shaft and connected to it via a rubber o-ring. For newer models
using the direct drive, the odometer is mounted centrally and directly to the wheel axel, so no o-ring
is necessary.
If necessary, the o-ring can be replaced for belt-driven models by removing the wheel, as shown in
. For this purpose, a spare o-ring is cable-tied to the encoder cable under the push-cart hood.
Note:
when refitting the wheel, use blue Loctite or equivalent to help secure the M6 retaining screw.
