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APPENDIX 7
PROCEDURE TO RE-CALIBRATE FLOW METER
1) Enter a METER 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 it into a calibrated 5 gallon [19 liter] container.
5) Switch ON appropriate boom switch (for the hose that was just placed into the 5
gallon container) and the MASTER switch. Pump exactly 10 gallons [38 liters].
6) Readout in TOTAL VOLUME is the new METER CAL number. This number should be within
+/- 3% of the calibration number stamped on the tag of the 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 METER 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:
METER CAL = 720 [190]
TOTAL VOLUME = 260 [984]
Predetermined amount of measured liquid = 250 [946]
Corrected METER CAL = METER CAL x TOTAL VOLUME
Predetermined amount of measured liquid
ENGLISH UNITS: METRIC UNITS:
= 720 x 260 = 749 = [190] x [984] = [198]
250 [946]
Corrected METER CAL = 749 [198]
9) Enter corrected METER CAL before resuming application.
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