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APPENDIX 5
PROCEDURE TO RE-CALIBRATE FLOW METER
1) Enter a FLOW/VALVE CAL number of 10 [38] in the key labelled:
2) Enter a TOTAL VOLUME of 0 in the key labelled:
3) Switch OFF all booms.
4) Remove a boom hose and place in calibrated 5 gallon [19 liter] container.
5) Switch ON appropriate boom switch and MASTER switch. Pump exactly 10 gallons
[38 liters].
6) Readout in TOTAL VOLUME is the new FLOW/VALVE CAL number. This number should
be within +/- 3% of the number stamped on the tag on Flow Meter.
7) Repeat this procedure several times to confirm accuracy. (Always "zero out"
the TOTAL VOLUME display before retesting).
NOTE: For greatest precision, set FLOW/VALVE CAL to 100 and pump 100 gallons (378
liters) of water.
8) To verify Flow Meter calibration, fill applicator tank with a predetermined
amount of measured liquid (i.e. 250 gallons). DO NOT RELY ON GRADUATION NUMBERS
MOLDED INTO APPLICATOR TANK. Empty the applicator tank under normal operating
conditions. If the number displayed under TOTAL VOLUME is different from the
predetermined amount of measured liquid by more than +/- 3%, complete the following
calculation.
EXAMPLE: FLOW/VALVE CAL = 720 [190]
TOTAL VOLUME = 260 [984]
Predetermined amount of measured liquid = 250 [946]
Corrected FLOW/VALVE CAL = FLOW/VALVE CAL x TOTAL VOLUME
Predetermined amount of measured liquid
ENGLISH UNITS: METRIC UNITS:
= 720 x 260 = 749 = [190] x [984] = [198]
250 [946]
Corrected FLOW/VALVE CAL = 749 [198]
9) Enter corrected FLOW/VALVE CAL before resuming application.
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