Step 4
Add elevation measurement of instrument to
“cut-to-invert” from grade hub.
5.38 ft 1.635 m
Step 5
Subtract the desired elevation of laser beam
above the pipe’s invert.
-0.50 ft
-0.152
m
Step 6 Subtract beam offset (0.23 ft / 70 mm). -0.23 ft -.070 m
Step 7 Calculated Rod Reading =
2.64 ft
3.70 ft
-0.50 ft
-0.23 ft
5.61 ft
0.805 m
1.128 m
-0.152
m
-0.070
m
1.711 m
Step 8
Set the rod on top of the Laser and adjust
elevation until the correct rod reading is
observed.
5.61 ft 1.711 m
Step 9
The laser beam is now set at your desired working elevation (6
inches / 0.5 ft / 152.4 mm) above the invert of the proposed pipe.
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