Set-up Methods
These instructions describe four ways to
set up: height adjustable legs, trivet, rod
and crossbrace, or above ground on a
tripod.
Height Adjustable Legs
The adjustable legs can be used to set up
in a manhole base, pipe, invert, or open
cut.
Manhole Base Set-up
1. Prepare laser for use: Attach leg set
with centerline leg at front and two
side legs at rear. Apply power, center
the line adjustment, and enter the
desired grade.
2. Transfer elevation from the hub to the manhole base.
3. Set the front (centerline) leg to the desired height: After determining the desired beam
height above the manhole base, adjust the front leg so the beam will be projected at that
height.
4. Set the unit in place: Position the point of the front leg on pipe centerline, 2” (5 cm) in front
of the manhole center, toward the pipe being laid for accurate alignment. (Figure H)
5. Roughly level the instrument by loosening the rear leg knobs and sliding the unit up or
down, then tighten.
6. Align laser to the forward manhole (see previous section on “Alignment”).
7. Recheck for level and accurate grade setting and proceed to lay pipe.
In-the-pipe Set-up
When setting up in-the-pipe, be sure the joint of pipe used for the set-up is accurately placed
for line and elevation.
Set-up in 6”(150mm) pipe:
1. Remove the handle/rod mount and legs, if attached. Apply power, center the line adjustment,
and enter the desired grade.
2. Slide the unit into the pipe. It should rest on the three fixed short leg points of the housing.
Rough level the unit in the cross axis direction if necessary, using the lighted cross-axis level
vial on the rear control panel.
3. Align the beam to the forward manhole using the remote line control, or the line adjustment
buttons on the unit.
Set-up in 8”, 10”(200mm, 250mm) and larger pipe:
1. Remove the handle/rod mount if attached. Apply power, center the line adjustment, and
enter desired grade.
2. Attach the leg set with two side legs at the front and the centerline leg at the rear. Set all
three legs so the appropriate pipe size mark is aligned with the centerline-of-beam mark
beside each leg slot.
3. Slide the unit into pipe and rough level in the cross-axis direction using the cross-axis level
vial on the control panel.
4. Align the beam to the forward manhole using the remote line control, or the line adjustment
buttons on the unit.
5. The beam should be projecting at pipe centerline. Allow the unit to self-level, then lay pipe.
NOTE: If you prefer, you can use the 6” (150mm) for ALL in pipe set-ups as long as you
remember to reference the lower offset to the gravel and trench excavation depth. What
is important is that the beam elevation from the invert and the target centerline elevation
from the invert is the same.
13
Manhole
Center
Place Front
Leg Point here
2"
5cm
Direction
Laser
Pipe
Figure H
