ABB C1900 Series, Operating Instructions Manual

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…1 INTRODUCTION
1.2 Application Overview – Fig. 1.1
In a dairy application, the C1900 Circular Chart Recorder
monitors the milking system cooling and washing cycles for
possible failures that could compromise milk quality and, most
importantly, provides a permanent record of these
parameters for traceability purposes.
During the milking process, the milk is extracted from the cows
by a vacuum milking system and passed into a bulk storage
tank where it is stored for a maximum of 48 hours prior to
collection by the Dairy. Whilst in the tank, the milk is cooled and
maintained at a temperature of 3°C ±1°C.
Cleaning of the vacuum milking and bulk storage systems is
done using soap or acid and hot water. The vacuum milking
system is cleaned after every milking; the bulk storage tank is
cleaned every time it is emptied, normally every 48 hours.
Two temperature sensors are used in the system. The first is
located in the milk storage tank and monitors the temperature
of the contents of the tank during the milk cooling cycle and
the system washing cycle. The second sensor is located in the
return pipeline from the barn to the vacuum milking system
and monitors the temperature of any product flowing in the
pipeline such as milk or cleaning solution.
A white indicator light located in the barn shows when the
refrigeration system is operating. A red warning light, also
located in the barn, is illuminated if milk temperature and/or
time limits are exceeded. An additional set of indicator and
warning lights can be mounted in a more convenient location
if required.
Under normal conditions the storage tank is empty and at
ambient temperature when the milking system is started.
Once there is sufficient milk in the storage tank (normally
within 20 minutes), the refrigeration system is started and the
temperature begins to fall.
If the refrigeration system has not been started 20 minutes
after the start of the milking system
and
the milk temperature
remains above 12°C, the red warning light is illuminated.
If the milk temperature has not been cooled to less than 10°C
within 120 minutes of the refrigeration system being started,
the red warning light is illuminated.
The refrigeration system remains operational whilst there is
milk in the tank and the red warning light is illuminated if the
milk temperature subsequently rises above 10°C. It is
important that the milk is cooled quickly and maintained at a
low temperature in order to meet legal requirements.
If the temperature of the milk in the tank rises above 10°C for
more than 2 minutes during subsequent milkings (when there
is already milk in the tank and the refrigeration system is on),
the red warning light is again illuminated.
Note. Additional alarms can be configured and
adjustments to time and trip points can be made in the
field as required to meet individual needs.
Compliance with local regulations must be maintained at all
times.