Guardian 70ES Operator's Manual page 30

3. With hose still attached to the formulation tank, unscrew the hose and draw tube
assembly from the formulation tank and place into a graduated cylinder. Reconnect
the tube from the nozzle to the top of the orifice fitting.
4. Add chemical to the graduated cylinder until well above the bottom of draw tube
and note volume in the cylinder.
5. Turn engine ignition on and pull start engine. Let engine warm for at least 30
seconds to one minute. If engine at idle, increase engine throttle manually until
pressure gauge reads approximately 80 PSI.
6. Ensure the top of the draw tube is close to the same height as it would be if
attached to the formulation tank. Note: if the draw tube is higher or lower than it
would be normally, this can skew the results and cause inaccurate flow calibration.
7. Open the spray valve on the rear side of the nozzle either manually or electrically if
that option is installed. Let spray for exactly 1 minute using a stop watch then turn
spray valve off.
8. Read remaining volume in graduated cylinder (note: do not remove the draw tube)
and subtract that number from that which was noted in step 4. This is your flow per
minute based on the orifice size selected.
9. Increase or decrease orifice size and repeat these steps until reaching the desired
flow results.
10. When Flow calibration is complete, reinstall the draw tube back into the formulation
tank and ensure all connections are secure.
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