Nova-Tech LMI Roytronic Series A Metering Pump - Manual (Page 20)

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OPERATION
4.3.3 Calibration in External Mode
1. Since pump output is governed by an external device such as Flowmeter-Pulser,
Liquitron ™ Controller, or 4-20 mA DC signal from an instrument with an LMI
Analog-to-Digital Converter, only the output per stroke may be calibrated.
2. With pump primed and discharge tubing connected to the injection point as it would
be in normal service, place Foot Valve Assembly in a graduated container with a vol-
ume of 1000 ml or more.
3. Switch pump to Internal mode with Speed Adjustment Knob set at 100% until air is
exhausted from suction line and pump head.
4. Switch pump OFF and refill graduate to a starting point.
5. Switch pump ON and count the number of strokes for exactly one minute, then switch
pump OFF.
6. Note volume pumped during the calibration period of one minute. Divide into this
the number of strokes to determine the volume of solution pumped per stroke.
Example: 720 ml in 240 strokes = 3.0 ml per stroke.
Multiply this by your expected stroke rate per minute, per hour or per day and compare
with desired output requirements.
7. Turn Stroke Adjustment Knob to your best estimate of required correction and repeat
calibration procedure.
It may be helpful
to decrease
the speed of
the pump in
order to count
the number
of strokes. For
accuracy count at
least 120 strokes.