DeLaval MM27BC - Page 7

ing parlour and should be stored under good
conditions on the farm, preventing pollution
and/or mechanical damage. Such will affect
the test results.
Principle of the test:
3.1.
3.1.3.1.
3.1. Set all MM27BC units to technician
mode using the remote control
(1:8:3:1, on the PSION remote or by
pressing technician mode tool on the
VPR100, see picture).
3.2.
3.2.3.2.
3.2. Wash the test probe GENTLY using
any soft soap. Dry the probe after-
wards.
3.3.
3.3.3.3.
3.3. Verify all MM27BC-channels are dry
and clean.
3.4.
3.4.3.4.
3.4. Wait 10 minutes to verify all units are
perfectly stable. If on some MM27BC
units an Hxxx
HxxxHxxx
Hxxx message show, wait
until it disappears. The Hxxx
HxxxHxxx
Hxxx mes-
sage implies that the MM27BC inter-
nal temperature is not stable yet.
3.5.
3.5.3.5.
3.5. While the MM27BC is in the tech-
nician mode and the MM27BC chan-
nel is dry, the meter performs an inter-
nal self test. The self test status is
shown on the MM27BC display as
Cxxx
CxxxCxxx
Cxxx (a number between 85 and 100)
every 10 to 20 seconds. As long as
the meter shows the Cxxx
CxxxCxxx
Cxxx message
the self test is ok. If no Cxxx
CxxxCxxx
Cxxx mes-
sage is seen or if SRVx
SRVxSRVx
SRVx message ap-
pears the Self Test failed.
3.6.
3.6.3.6.
3.6. If the Self Test failed the operator
should verify that the MM27BC chan-
nel is dry and clean and wait for
the self test status again. If still the
MM27BC self test fails, the operator
can try to fix the problem by using
the Psion “RECAL” option. If still the
MM27BC self-test fails the MM27BC
meter is defective and should be re-
placed.
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Ratio min = Ref MinF / Current MinF
Ratio max = Ref MaxF / Current
MaxF
Write the Ratio min
Ratio minRatio min
Ratio min and Ratio max
Ratio maxRatio max
Ratio max
values on the “DeLaval milk meter
MM27BC Periodic routine test form”.
If Ratio min
Ratio minRatio min
Ratio min and Ratio max
Ratio maxRatio max
Ratio max are be-
tween 0.98 and 1.02 the meter is
OK. Values outside the 0.98-1.02
range are too big and the meter fails
for the routine test. In case of FAIL
the MM27BC channel should be
cleaned and inspected visually for
any abnormalities. Note that most of
deviation from the perfect 1.00 result
is usually because the probe test is
very sensitive. Small changes in the
probe surface and/or cleanness will
have affect on the measurement.
Failed meters
Meters that failed the test should be
inspected and if necessary cleaned
internally and examined again. If a
MM27BC Self test fails, a RECAL
command using the Psion or VPR100
may solve the problem.
A meter that continues to fail after
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DeLaval milk meter MM27BC
DeLaval milk meter MM27BCDeLaval milk meter MM27BC
DeLaval milk meter MM27BC
161 Preventive maintenance
7 (22)
© DeLaval 2012.All rights reserved.
Printout from Memoviewer 11/6/2012.