Check with no milk flow at system vacuum with teat dummies.
Check at the short air tube of both pulsation channels
A-phase
110ms +/- 30ms
B-phase
475 – 500ms
C-phase
110ms +/- 30ms
D-phase
>200ms
A and C phases are a function of pulsator style/brand, length of pulsation hose, and liner/shell design and cannot be changed by rate and ratio.
* As with any liner change, it’s critical to observe cow comfort levels and check for discoloration of the teats. Transition to a new liner may be immediate but could take several days. Vacuum and pulsation changes should only be made after cows transition completely.