4. Volumetric Calibration In External Mode; 5. Pressure Control - Milton Roy LMI P1 Basic Manual

III – 4. VOLUMETRIC CALIBRATION IN
EXTERNAL MODE
1. Since pump output is governed by an external device
such as Flowmeter-pulser, Liquitron™ Current-to-
frequency converter or 4-20 mA DC signal from an
instrument with an LMI Analog-to-digital converter,
only the ouptut per stroke may be calibrated.
2. With pump primed and discharge tubin connected to
the injection point as it would be in normal service,
place foot valve in a graduated container.
3. Swtch pump to Internal mode with speed knob set at
100 until air is exhausted from suction line and pump
head.
4. Adjust control pressure (B7 – C7 series).
5. Turn the pump off. Refill graduated container to a
level strarting point.
6. Switch pump on and count the number of strokes.
For a good accuracy, count at least 100 strokes.
Switch pump off.
7. Note the volume pumped during the calibration
period and the number of strokes. Divide into the
volume the number of strokes to determine the
volume of solution pumped per stroke.
8. Adjust stroke length knob to desired value refering to
calibration.
LMI, Doseur à membrane, L001, Rev.B, 1098
III – 5. PRESSURE CONTROL
Adjust pressure control (B7 - C7 series) : while unit is
running, turn pressure control knob fully clockwise then
turn slowly counter-clockwise until unit just begins to
stall. This is the optimmum pressure control setting for
your installation. Adjust pressure control to prolong
pump life.
Increase setting if back pressure is increased.
F : Excess pressure
Fig. 3.3a : Control pressure
Note : On series A9, B9, C9, this setting is in the main
menu.
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