6
GB
Horizontality of the line-of-sight
IMPORTANT:
The line-of-sight needs to be horizontal within 3mm of level
to be accurate.
Establish datum
• Set up the level on a tripod halfway between two measuring staffs
(Fig. 10). Set approximately 39m to 50m apart. Centre the bubble
Fig.10
• Take the reading on staff A where it is intersected by the middle hair - for
example: 1.924m
• Rotate the level and take the reading on staff B where it is intersected by
the middle hair - for example: 1.712m A - B = 0.212m. Thus B is 0.212
higher than A
Check the line-of-sight
• Move the level and set it up about 1m from A (Fig.11)
Fig.11
• We know that B is 0.212m higher than A. Thus the reading to B should be
0.212 less than that to A
• Read the staff at A - for example 1.696m
• Subtract 0.212m; therefore the reading to B should be 1.484m
• Read staff at B. If the reading is 1.484m ±3mm, the line-of sight is
horizontal
To correct line of sight, if necessary
• Screw off the Eyepiece Cover (3)
• Turn the adjusting screw (See Fig. 5) until the middle hair gives the
required reading of 1.484m on the staff at B
• Replace the cover, but do not over tighten
Accessories
• Tripod - Silverline Aluminium Tripod - product code 868659
• Level staff - Silverline Aluminium Level Staff - product code 675157
Maintenance
• To protect all parts and retain accuracy, take good care of this instrument
• After use, clean the lens with a soft brush or lens cloth. DO NOT touch the
lens with your fingers
• Use a soft brush or cloth to clean the body of the machine
• This product is calibrated to GB/T 10156-1997 at the factory
• If the instrument is damaged, faulty or requires re-calibration, it must be
adjusted or repaired only by a qualified technician
• When sending the optical level for repair or adjustment it must be sent in
its original case with additional external packaging
Storage
• Store the instrument in the case provided, in a clean, dry place. Avoid
storage in areas prone to large temperature fluctuations
• A bag of silica gel is included to absorb any moisture in the case. If the
bag is damp, dry it out or replace with a new one
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