MIL-HDBK-1164
Table 45
Calibration Tests for Dry Chemical Feeders
Inspection
Action
(1),(2)
Volumetric dry
feeders
W
Test calibration and
Perform the test described below for your type
adjust feeder
of volumetric dry feeder (with or without scale)
and repeat several times.
Average the data from several tests to
compare with the rate setting, rate indicator,
and recorder (if one is used). Take particular
care in the timing and weighing operations.
Make any adjustments necessary to bring the
feed rate within 5 percent by weight of the
rate setting.
Feeders not on a
Make at least three tests within the normal
W
scale
operating range of the feeder.
Use a pan or other container of known weight
to catch the discharge of the feeder for a
definite period. Weigh the discharged
material, calculate the rate of feed per hour,
and compare the results with the rate setting,
rate indicator, and recorder (if one is used).
Feeders on a
Balance the scale or record initial reading
W
platform scale
while the feeder is stopped; start the feeder
and run for a definite period; rebalance the
scale (i.e., record weight loss).
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