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APPENDIX 6
FLOW METER MAINTENANCE AND ADJUSTMENT PROCEDURE
1)
Remove Flow Meter from sprayer and flush with clean water to remove any chemicals.
NH
3
WARNING:
Thoroughly bleed nurse tank hose and all other system lines prior
to disassembling the Flow Meter, fittings, and hoses.
2)
Remove flange bolts or clamp from the Flow Meter.
3)
Remove the turbine hub and turbine from inside Flow Meter.
4)
Clean turbine and turbine hub of metal filings or any other foreign material, such
as wettable powders. Confirm that the turbine blades are not worn. Hold turbine
and turbine hub in your hand and spin turbine. The turbine should spin freely
with very little drag inside the turbine hub.
5)
If transducer assembly is replaced or if turbine stud is adjusted or replaced,
verify the turbine fit before reassembling. Hold turbine hub with turbine on
transducer. Spin turbine by blowing on it. Tighten turbine stub until turbine
stalls. Loosen turbine stud 1/3 turn. The turbine should spin freely.
6)
Re-assemble Flow Meter.
7)
Using a low pressure (5 psi) [34.5 kPa] jet of air, verify the turbine spins freely.
If there is drag, loosen hex stud on the bottom of turbine hub 1/16 turn until
the turbine spins freely.
8)
If the turbine spins freely and cables have been checked per Appendix "PROCEDURE
TO TEST FLOW CABLES", but Flow Meter still is not totalizing properly, replace
Flow Meter transducer.
