Appendix B
240 Viper Pro Installation & Operation Manual
Meter Cal or Product Density
For liquid applications, the meter cal value is typically found on the flow meter. Enter the value found on the
flow meter to ensure the field computer is properly registering the product flow during product application.
For granular products, enter the product density or weight of 1 cubic foot [1 cubic meter] of product as the
density value. The density of the product must be entered to calibrate the field computer to the weight of
product being applied.
Flow Meter Service and Maintenance
Periodic maintenance of the flow meter may help to extend the effective service life of the flow meter or internal
components. If the flow meter does not register the applied product volume properly, the following steps will be
necessary to service the flow meter:
The following procedure should be performed more frequently if the flow meter is used with harsh chemicals or
in anhydrous ammonia.
1. Remove the flow meter from the application system and flush with clean water.
2. If necessary, dismantle the flow meter housing.
3. Remove the turbine hub and turbine from the flow meter.
4. Clean the turbine hub and turbine and remove any metal filings or other foreign materials such as wettable
powders.
5. Check the turbine blades for wear or damage. Refer to the flow meter replacement parts sheet provided
with the flow meter and replace the turbine as necessary.
6. While holding the turbine hub, spin the turbine. The turbine should spin freely with very little drag within the
turbine hub. Refer to the flow meter replacement parts sheet provided with the flow meter and replace the
turbine hub/turbine assembly as necessary.
7. Reassemble the flow meter.
8. Using a low pressure jet of air (5 PSI [34 kPa]), verify that the turbine still spins freely after reassembly. If the
turbine drags or does not move, loosen the hex stud on the bottom of the turbine hub 1/16 turn until the
turbine spins freely.
9. If the flow meter continues to provide inaccurate product volumes, refer to the Flow Meter/Encoder
Extension Cables section on page 255.
WARNING
Exposure to agricultural chemicals may be
harmful or fatal. Thoroughly bleed and flush the
application system lines prior to disassembling
fittings, hoses and the flow meter.
If the flow meter is used for applying anhydrous
ammonia, bleed the nurse tank hose and flush
the system with water before maintaining the
flow meter.
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