Bosch GRL Professional 250 HV Original Instructions Manual page 14

OBJ_BUCH-1492-001.book Page 14 Friday, July 1, 2011 12:25 PM
14 | English
Consequently, the difference d between points I and III for
each of the four individual measurements may not exceed
4 mm max.
If the measuring tool should exceed the maximum deviation in
anyone of the four measuring procedures, have it checked at
a Bosch after-sales service agent.
Working Advice
Always use the centre of the laser point for marking.
The size of the laser point changes with the distance.
Laser Viewing Glasses (Accessory)
The laser viewing glasses filter out ambient light. This en-
hances the laser visibility for the eye.
Do not use the laser viewing glasses as safety goggles.
The laser viewing glasses are used for improved visualisa-
tion of the laser beam, but they do not protect against laser
radiation.
Do not use the laser viewing glasses as sun glasses or in
traffic. The laser viewing glasses do not afford complete
UV protection and reduce colour perception.
Working with the Laser Receiver (Accessory)
Under unfavourable light conditions (bright environment, di-
rect sunlight) and for larger distances, use the laser receiver
for improved finding of the laser beam 29.
When working with the laser receiver, select rotational opera-
tion with the highest rotational speed.
Before working with the laser receiver, read and observe the
laser receiver operating instructions.
Working with the Remote Control
While pressing the operator buttons, the measuring tool can be
brought out of alignment so that the rotation is briefly stopped.
This effect is avoided when using the remote control.
Reception lenses 7 for the remote control are located on three
sides of the measuring tool, among other locations above the
control panel on the front side.
Working with the Tripod (Accessory)
The measuring tool is equipped with a 5/8" tripod mount for
horizontal operation on a tripod. Place the measuring tool via
the tripod mount 15 onto the 5/8" male thread of the tripod
and screw the locking screw of the tripod tight.
On a tripod 31 with a measuring scale on the elevator column,
the height difference can be adjusted directly.
Working with Wall Mount/Alignment Unit (Accessory)
(see figure B)
You can also mount the measuring tool to the wall mount with
alignment unit 33. For this, screw the 5/8" screw 36 of the
wall mount into the tripod mount 15 of the measuring tool.
Mounting to a wall: Mounting to a wall is recommended, e.g.,
for work above the elevation height of tripods or for work on
unstable surfaces and without tripod. For this, fasten the wall
mount 33, with the measuring tool mounted, as vertical as
possible to a wall.
For mounting to the wall, you can either fasten the wall mount
33 with fastening screw 34 to a lath (width maximal 8 mm) or
hang it up with two hooks.
1 619 929 J23 | (1.7.11)
Mounting on a tripod: The wall mount 33 can also be screwed
onto a tripod with the tripod mount on the back side. This meth-
od of fastening is especially recommended for work where the
rotational plane is to be aligned with a reference line.
With the alignment unit, the mounted measuring tool can be
moved vertically (when mounted to the wall) or horizontally
(when mounted to a tripod) within a range of approx. 16 cm.
For this, loosen screw 35 on the alignment unit, move the
measuring tool to the desired position, and retighten screw
35 again.
Working with the Ceiling Measurement Plate
(see figure B)
As an example, the ceiling measurement plate 38 can be used
for easy height adjustment of drop ceilings. Fasten the ceiling
measurement plate with the magnetic holder, e.g., to a beam.
The reflecting half of the ceiling measurement plate improves
the visibility of the laser beam in unfavourable conditions; the
laser beam can also be seen from the rear side through the
transparent half.
Working with the Laser Target Plate (Accessory)
(see figure C)
With the laser target plate 37, the laser mark can be projected
on the ground/floor or against a wall. With the magnetic hold-
er, the laser target plate can also be fastened to ceiling con-
structions.
With the zero field and the scale, the offset or drop to the re-
quired height can be measured and projected at another loca-
tion. This eliminates the necessity of precisely adjusting the
measuring tool to the height to be projected.
The laser target plate 37 has a reflecting coating which im-
proves the visibility of the laser beam from a larger distance or
in case of strong sun rays. The luminosity can be recognized
only if you look to the laser target plate in parallel to the laser
beam.
Working with the Measuring Rod (Accessory)
(see figure J)
For checking irregularities or projecting gradients, it is recom-
mended to use the measuring rod 30 together with the laser
receiver.
A relative millimeter scale (±50 cm) is marked on the top of
the measuring rod 30. Its zero height can be preset at the bot-
tom of the elevator column. This allows for direct reading of
deviations from the specified height.
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