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APPENDIX 6
PROCEDURE TO RE-CALIBRATE FLOW METER
1) Enter a METER 1 CAL number of 10 [38] in the key labelled:
2) Enter a PROD 1 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 DATA display is the new METER 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 PROD 1 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
PROD 1 VOLUME is different from the predetermined amount of measured liquid by more than +/
-3%, complete the following calculation.
EXAMPLE: METER 1 CAL = 720 [190]
PROD 1 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 1 CAL = 749 [198]
9) Enter corrected METER 1 CAL before resuming application.
NOTE: For RFM 200 series Flow Meter, use old METER CAL number of 164 [43] and
calibrate as described in Step 8.
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