Page 45 - QR CIMAR LASER SCREED

TROUBLESHOOTING - SCREEDING OPERATIONS

CONDITIONS THAT MAY AFFECT THE LASER CONTROL SYSTEM

1) The following may cause interference between the laser transmitter and the receivers:
a) Fog.
b) Dust
c) Diesel Exhaust.
d) Unevenly heated air.
e) Using a column clamp on a building column. Wind or other disturbances may cause the building
to rock. This movement will not be discernible by eye, but can easily be enough to cause erratic
signals. Use of a tripod may eliminate the problem.
f) Heavy equipment such as a bulldozer or a vibratory roller operating nearby. This can cause
ground to vibrate enough to affect the transmitter. If equipment cannot be shut off, try relocating
the transmitter further from the source of vibration and mount the transmitter on a tripod rather
than a building column.
g) Wind may cause the transmitter tripod to rock. Try hanging weights, such as several concrete
blocks, from the center of the tripod, or place a wind break, such as a vehicle, upwind.

2) Fluorescent lights may cause a solid red high signal. Possible solutions:
a) Shut off lights.
b) Install shields above the receivers.

3) Weak batteries in the transmitter will cause:
a) Weak erratic signals.
b) No signal if far enough away.

4) Reflective surfaces such as glass or galvanized sheet metal, located at the same height as the
transmitter, can cause false beam reflections to strike the receivers and result in erratic high or low
signals. Solutions:
a) Place a nonreflective material at transmitter height on the reflective surfaces.
b) Tape up the side of the receiver that is picking up the reflected signal.
c) Place nonreflective shield between transmitter and source of reflection.
d) Tape the window of the transmitter on the reflection source side.

5) If isolated areas of rippled concrete finish are noticed, it may be due to interference of the laser
beam by the support legs at the corners of the transmitter rotating beacon housing. Rotate the
transmitter as necessary to eliminate the blockage by the support legs.

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