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Effects of Milk Temperature, Flow Rate and Batch Size on the Accuracy of a Typical Tanker-Mounted, Positive-Displacement Milk-Metering System
M. G. Fleming
Irish Journal of Agricultural Research
Vol. 20, No. 2/3 (1981), pp. 155-161
Published by: TEAGASC-Agriculture and Food Development Authority
Stable URL: http://www.jstor.org/stable/25556002
Page Count: 7
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Using a purpose built 500-l reference vessel and variable speed milk pump, the repeatability and accuracy of a positive displacement milk metering system, as affected by milk temperature (range 4°-20°C), flow rate (range 160-320 l min⁻¹) and batch size were evaluated. Irrespective of milk temperature or batch size the effect of flow rate was small. The effect of milk temperature, however, was large and significant, especially when milk (490 l approx.) was metered in small (45 l) batch quantities. Hence, while the mean meter values were close to the reference values at a milk temperature of 20°C the meter reading increased by up to 0.3% at 12°C and by near 0.9% at 4°C. Repeatability at 4°C (within ± 1.0%) was almost four times less than that obtained at 20°C. When the milk was metered from a single vessel, a reduction in milk temperature from 12° to 4°C resulted in a relatively small increase (0.14%) in meter reading with a repeatability of ± 0.5%. When the milk (490 l approx.) at 4°C was metered from 45-l churns rather than from a single container, an increase in meter reading of 0.8% was apparent. This error was reduced to between 0.2 and 0.3% at a milk temperature of 12°C.
Irish Journal of Agricultural Research © 1981 TEAGASC-Agriculture and Food Development Authority