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3. Align Transit to Laser – Tilt the transit down and sight on the line pivot LED. On the
transit, use the laser centerline knob to adjust the vertical crosshair until it is exactly
aligned with the line pivot LED on the laser. Repeat steps 2 and 3 until the crosshair is
on the forward manhole marker and the line pivot LED.
4. Align the Laser Beam to the Transit – Place a target in the ditch approximately 15’
(5m) out in front of the laser. Tilt the transit down to view the target. Adjust the beam
left to right using the line adjust buttons on the remote until the beam is exactly
centered on the vertical crosshair.
The transit should be able to swing from the beam, to the line pivot LED, or forward manhole
marker, with each being exactly aligned to the crosshair. Repeat steps 2, 3, and 4 if
necessary. When all three are accurately aligned, pipe laying can proceed.
Stringline Method
The stringline provides a quick, easy method of
beam alignment. Place a target in the ditch
approximately 50’ (15m) out from the laser.
Attach a string to the eyelet hook, located on top
of the GradeLight and keeping it plumb, hold it
taut, vertically above the unit. (Figure G)
Stand behind the string and visually center it on
the forward manhole. Lower your gaze to the
target and use the remote control to adjust the
beam left or right until exactly centered behind
the stringline.
When the stringline can be seen centered on the
forward manhole marker and on the beam in the
ditch, alignment is complete.
Plumb Bob Method
This method of alignment can be used if the cut
is not too deep and the wind is relatively calm.
The laser must be set up at the correct elevation
and exactly on pipe centerline. Place a target in
the ditch approximately 50’ (15m) out from the
laser. Measure over form an offset hub to the
pipe centerline and drop a plumb bob down to
the target.
Mark where the plumb bob strikes the target and
adjust the beam left or right until it is centered on the plumb mark.
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