nents should be carried out to verify that
there are no big changes of equipment
installation or leakages.
The five values below represent milking
point parameters that if significantly changed
may affect the MM27BC bias and therefore
the results of the milk yield measurements.
If the routine test should fail, the MM27BC
meters must be recalibrated with milk.
Vacuum level:
If the vacuum level has changed by more
than 2.5 Kpa since the installation test,
the routine test fails.
Claw type:
If another significantly different claw is in-
stalled, the routine test will fail.
Milk tubes:
If the diameter of the milk tubes be-
tween milking cluster and the milk
meter has been changed, the routine
test fails.
If the length of the milk tube between
milking cluster and the milk meter has
been changed by more than +/- 10%,
the routine test fails.
If the milk tube between MM27BC
meter and milk pipe line has been
changed in diameter or in length, the
routine test fails.
The height of the MM27BC meter relative
to the cow platform:
If this distance has been changed by
more then 7 cm, the routine test fails.
Air inlet:
Increased air inlets or leakages will
cause deviations in the reading of the
MM27BC milk meter. If the air inlet has
significantly changed by more than 10%
compared with the installation test, for
example by air leakages along the cluster
to the MM27BC milk meter, the routine
test fails. The air inlet can be observed
by visual inspection and by measuring
the air leakage using the VPR100.
DeLaval milk meter MM27BC
DeLaval milk meter MM27BC
DeLaval milk meter MM27BC
DeLaval milk meter MM27BC
161 Preventive maintenance
5 (22)
© DeLaval 2012.All rights reserved.
Printout from Memoviewer 11/6/2012.
