MEASURING - 7 - NMC TESTING_Dry Tests Pulsators

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* 1. Enter your first and last name

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* 2. Select all that apply. What conditions should be satisfied for dry tests of pulsators?

the milking unit is connected to the milkline and supplied with the vacuum

the milking unit is on a cow and extracting milk

the liners are fitted with teatcup plugs

the pulsator is operating

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* 3. Select all that apply. What are the specifications for pulsation in the ISO 5707 and ASAE S518 standards?

pulsation rate must not deviate more than three cycles per minute from one unit to another

b-phase must be at least 30% of the pulsation cycle

d-phase must not be less than 15% of the pulsation cycle, and no less than 150 milliseconds long

a-phase and c-phase must be more than 10%, and less than 13%, of the pulsation cycle

pulsation ratio must not differ more than 5% from the manufacturer's specifications, or from one pulsator to another

pulsation rate must be repeatable from day-to-day

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* 4. What is the main objective of performing dry tests of pulsators?

to determine if the pulsation system and all pulsators are operating according to the manufacturer's specifications

to check to see if any pulsators are limping

to evaluate if the pulsation system is causing operational problems in the milking routine

to diagnose if filtered pulsator air lines need to be installed

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* 5. Select all that apply. Pulsation faults are commonly due to:

foreign matter lodged under pulsator valve seats

dirt in the pulsator air port

air leaks in short air tubes connecting the teat cups to the air fork on the claw

a low vacuum level in the pulsator airline

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* 6. Abnormal pulsation graphs can be caused by problems within the pulsator, restrictions in the pulsator air tube, or air leaks in pulsation tubes.

True

False

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* 7. Select all that apply. Match the pulsation faults with their most likely causes.

slow a-phase and rapid c-phase: an air leak from the atmosphere

slow a-phase and slow c-phase: restrictions to air flow in both directions

normal a-phase, slow c-phase, and short d-phase: partial blockage in the pulsator air port

d-phase that does not reach atmospheric pressure, even though it's relatively horizontal in the graph: foreign matter between the pulsator valve and valve seat