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5 Applications and Setups
40 DG711 and DG511 Pipe Laser User Guide
3 Set up an automatic level and
measure the elevation of the
automatic level above grade hub.
4 Add elevation measurement of
instrument to “cut-to-invert” from
grade hub.
5 Subtract the desired working of
elevation of laser beam above
invert.
6 Subtract the beam offset
(70 mm / 0.23 ft).
7 Calculate new rod reading.
8 Set the rod on top of the laser
and adjust the elevation of the laser
until the correct rod reading is
observed.
9 The laser beam is now at the
proper working elevation.
HIn
Laser beam distance
above invert
Rod reading
on top of laser
Rod reading
on grade hub
Cut to invert
Table 5.3 Example 2: Setting Grade Rod on Top of Laser
Step Description Metric Ft / Inch
Step 1 Decide what elevation the laser beam
shall be used above the invert.
0.152 m 0.5 ft
Step 2 Record the “cut-to-invert” information
from the grade hub.
0.805 m 2.64 ft
Step 3 Measure the elevation (HI) of the
optical instrument above the grade
hub.
1.128 m 3.70 ft
Step 4 Add elevation measurement of
instrument to “cut-to-invert” from grade
hub.
1.635 m 5.38 ft