MIL-HDBK-1164
Table 45 (Continued)
Inspection
Action
(1),(2)
From the difference in the two scale readings,
calculate the amount fed in the measured time
and then calculate the feeding rate in pounds
per hour.
Belt-type gravimetric
Calibrate weekly or whenever the feeder is
W or V
feeders
used for a different chemical.
Clean belt and
Clean according to manufacturer's instructions
W or V
feeder
Set initial balance
Balance the scale and operate the feeder until
W or V
the feeder scale beam is in full balance and
indicates a proper load on the belt. If the
feeder is proportionally paced, set the
proportioning equipment on "manual control."
Set the rate-of-feed at maximum and proceed
with the following calibration test.
Stop the feeder and make sure the scale
moves freely and is in exact balance.
Adjust the amount of chemical on the belts by
adding or removing chemical at the rear of the
belt, until an exact balance is obtained.
Zero the belt revolution counter or weight
integrator, start the feeder, and run it until a
definite weight of chemical has been
discharged (about two-thirds of a belt load).
Then stop the feeder.
Determine weight of
Rebalance the scale precisely.
W or V
material discharged
The difference between this scale reading and
the one taken during the test is the weight of
material discharged.
224
Previous Page
