Checkline MK - Manual (Page 4)

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contacts are free from potential. Instead of the the lamps shown in the
illustration shown on page 3, it is, of course, possible to connect other
equipment, such as bell, horn, relay, etc.
The contact load specified in the figure on page 3 of max. 24 V / 2 W must
not be exceeded. The setting of the desired tolerance range has to be tuned
to the local conditions by experimenting.
To set the MAXIMUM tolerance limit:
1. Loosen the locknut on the MAX setscrew.
2. Turn the setscrew counterclockwise to decease the MAXIMUM
tolerance, or
3. Turn the setscrew clockwise to increase the MAXIMUM tolerance.
4. Tighten the locknut on the MAX setscrew again.
To set the MINIMUM tolerance limit:
1. Loosen the locknut on the MIN setscrew.
2. Turn the setscrew clockwise to decrease the MINIMUM tolerance, or
3. Turn the setscrew counterclockwise to increase the MINIMUM
tolerance.
4. Tighten the locknut on the MIN setscrew again.
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2.0 V ERIFYING THE MK C ALIBRATION
All tension meters are calibrated with standard materials—such as polyamide
monofilament (PA)— according the factory procedure. Filament sizes are noted
in Section 4.2.
Any difference in process material size and rigidity from the standard material
may cause a deviation of the accuracy.
In 95 % of all industrial applications the factory calibration has been proven to
provide the best results and is used for comparative purposes.
If the process material differs significant in size, rigidity and shape we recom-
mend special calibration using customer`s sample. For this purpose a material
sample of 5 m should be supplied.
2.1 Checking procedure
1. Suspend a known weight that
corresponds to the tension to be
measured (pay attention to the
correct unit of measure) from
the Process material, vertically,
as shown in the figure. Always
use a fresh portion of the material
to be measured.
2. Before the final check, move the
Process material slowly up and
down to compensate any friction
caused by the instrument and thus
ensure the repeatability.
3. The tension value should be equal
to the value of the suspended
weight.
If this procedure shows a deviation beyond the allowable tolerance and a
reliable operation is no longer allowed, the instrument has to be recalibrated
or repaired.
For recalibration, return the tension meter to the factory.
Measuring
roller
Guide
roller
Process
material
Scale
Weight