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APPENDIX 7
PROCEDURE TO RE-CALIBRATE FLOW METER
1) Enter a METER CAL number of 10 [38] in .
2) Enter a TOTAL VOLUME of 0 in .
3) Place MASTER switch to OFF.
4) Remove a boom hose and place in calibrated 5 gallon [19 liter] container.
5) Place POWER switch to ON, a lane switch ON and MASTER switch to ON. Enter a
self test speed of 5 mph. 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 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.
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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