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Issue/Rev. 0.6 (2/06)
3-A Sanitary Meters/Internals
The INVALCO 3-A (28-03) Sanitary Turbine Flow meter is certified for use in the food and beverage industry where
3-A is required. The meter has been specially designed to have the same characteristics, flow ranges, and life as
all the Invalco industrial meters, and also meet or exceed the requirement of 3-A (28-03). The meter has a
maximum surface finish of 32ra on all internal parts; all components are manufactured out of 3-A approved
material, and can be cleaned in place to save time and money in disassembling cleaning and reassembling the
meter. The wear surfaces are made from FDA (3-A) approved carbide for superior wear resistance.
The meter can be cleaned as long as the following conditions are met:
! Caustic solutions that are acceptable with 316 stainless steel components
! Temperatures of less than 275ºF (135ºC) for less than a 60 minute duration
! Instantaneous flow Ranges of the fluids must never exceed the chart below.
Meter Size Flow Range (GPM)
3/4 1.5-15
1 6.5-65
1 1/2 17.5-175
2 33-330
3 60-600
! Air purging must be done with care not to create severe shock loading to the meter, and velocity through the
meter must not exceed the instantaneous published flow ranges of the meter.
! Radii at ends of meters and the thrust bearing pockets (see figure 14) must be periodically checked for
cleanliness and adjustments in cleaning may be required to clean these areas. If areas do not clean in place
the meter may need to be disassembled from the line and cleaned by hand or other method to insure proper
cleanliness is being achieved. If the meter is disassembled for cleaning or inspection, care must be
taken not to lose the thrust bearings located at either end of the shaft. All replacement internals utilize a
sanitary paste to ensure that the bearings remain in place during assembly.
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