11. TROUBLESHOOTING
74
The laser beam is
unstable.
1) The laser beam is refracted due to
temperature differences within the
pipe.
2) The laser beam is refracting and
reflecting due to fog and/or mist.
1) When the pipe is laid, the trench
must be backfilled immediately
to help maintain temperature
stability.
2) Use a blower (commercially-
available) to move air through
the pipe to blend the air and
remove mist or fog.
• Cover the pipe to prevent heat
build up inside the pipe.
• Clear the mist or fog.
The laser position
shifts over time
passed.
1) The pipe may be sinking.
2) The target is not securely held.
1) Confirm the pipe grade setting
using a level.
2) Secure the target within its
holder.
Conditions Causes Countermeasures
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