Crown CT44022 - Page 13

13
English
but the suspension gear of the laser head is locked�
No acoustic signals are given when the appliance is
inclined� You can switch on and off the laser beams
pressing on / off switches 5 and 7�
Switching off:
Press and release on / off switches 6�
Design features
Laser head self-levelling system
Laser head self-levelling system makes laser mea-
surement possible, if the appliance is put on an in-
clined or uneven surface (inclination angle not ex-
ceeding ±3°)�
If maximum possible inclination angle is exceeded, la-
ser beams start blinking; the appliance gives an acous-
tic signal� In this case put the appliance onto an even
surface or adjust the position with adjustable legs 10�
Use bubble level 8 to facilitate the appliance position-
ing�
Attention: if the appliance is moved dur-
ing use, lock the laser head during stor-
age and transportation (set lock 9 to the
position shown in g. 3.2).
Adjustable legs (see g. 1.1)
Adjustable legs 10 allow for appliance position alignment
if put on an inclined or uneven surface (see g. 1.1).
Bubble level
Bubble level 8 shows appliance position in a horizontal
plane� If the air bubble is in the middle of bubble level 8,
the appliance is positioned correctly (see g. 1.2).
Swivel bolt (see g. 4)
Swivel bolts 11 make it possible to turn the appliance
with a small angle with high precision (see g. 4).
Working advice
Precision test
If measurement error exceeds maximum
allowable variance during the precision
test, please contact CROWN service cen-
tre.
Factors, inuencing appliance precision:
• Ambient temperature, e�g�, temperature differ-
ence which may take place with distance from the
ground� Temperature difference is most consider-
able near ground surface, therefore it is recom-
mended to use the tripod for measurements in areas
with length exceeding 20 m�
• Contamination of the laser emitter window� Al-
ways check protective windows for contaminations
before use and clean them if necessary�
• Measurement through transparent surfaces (win-
dows, aquariums, etc�)� It is not recommended to
carry out such measurement�
• Measurements on reective surfaces (mirrors,
polished metal surfaces, etc�)� It is not recommend-
ed to carry out such measurement�
• Presence of steam, dust, smoke, etc� in the air� It
is not recommended to carry out such measurement�
• Fall of the appliance or a heavy shock� In this
case it is recommended to perform a precision test�
If maximum allowable variance is exceeded, please
contact CROWN service centre�
Horizontal beam precision test (surface slope) (see
g. 3, 5)
• Put the appliance onto an even horizontal surface
between two walls ("A" and "B" in the gure) 7 m apart
from each other�
• Turn on the appliance as described above (laser
head self-levelling on, see g. 3.1). Turn on horizontal
and vertical laser beams�
• Mark the point of intersection of two laser beams on
wall "A" (point "a1" in g. 5.1).
• Turn the appliance body and mark the point of
intersection of two laser beams on wall "B" (point "b1"
in g. 5.2).
• Position the appliance in the distance of 0,5-0,7 m
from the wall and mark the same points (point "a2" and
"b2" in g. 5.3 and 5.4).
• If differences [а1-а2] and [b1-b2] do not differ from
each other in value exceeding the allowable variance,
specied in the technical data sheet (1 mm), the
appliance precision is within allowable limits�
Example: the difference [а1-а2]=6 mm and
[b1-b2]=5 mm. Thus, the variance value of the appli-
ance is [а1-а2]-[b1-b2] = 6-5 = 1 mm.
Horizontal beam precision test (surface bending)
(see g. 3, 6)
• Put the appliance onto an even horizontal surface
approximately 7 m apart from the wall�
• Turn on the appliance as described above (laser
head self-levelling on, see g. 3.1). Turn on horizontal
and vertical laser beams�
• Mark the point of intersection of two laser beams on
wall "A" (point "c1" in g. 6.1).
• Turn the appliance body to the right (point "c2")
approximately 2,5 m and ensure that the horizontal
line matches point "c1" or the distance from this point
("x1") does not exceed half of the allowable variance
value (0,5 mm), specied in the technical data sheet
(see g. 6.2).
• Perform the same actions turning the appliance
body to the left (point "c3" and distance "x2") (see
g. 6.3).
Vertical beam precision test (see g. 3, 7)
• Put the appliance onto an even horizontal surface
approximately 7 m apart from the wall�
• Fix an approx� 2,5 m long plumb line to the wall�
• Turn on the appliance as described above (laser
head self-levelling on, see g. 3.1). Turn on the
vertical laser beam and focus it toward the plumb line
(see g. 7).
• The laser beam shall evenly illuminate the plumb
line in its whole length� If not the case, the offset ("x3")
shall not exceed the variance value (1 mm), specied
in the technical data sheet�