FMI STH/Q User Manual
Page 6
3.4 Dispense Volume Values for FMI STH/STQ
Pumps:
NOTE: To assure the best performance set the
pump displacement volume as large as possible.
FMI pumps are calibrated at the factory to the
maximum value. Both STH and STQ pumps can
be factory adjusted down to as little as 10% of the
rated flow.
3.5 Adjusting Dispense Volumes:
To fine adjust dispense volumes rotate the stroke
length adjustment s crew using the appropriate hex
driver (see Required Tools on page 1). To increase
the flow, turn the screw counter-clockwise.
To decrease the flow, turn the screw clockwise
CCW=Increase, CW=Decrease.
CAUTION: DO NOT LOOSEN THE HEX LOCK
NUT WHEN ADJUSTING THE STROKE RATE.
IT IS SET AT THE FACTORY AND SHOULD NOT
BE TAMPERED WITH. See Figure E
3.6 Lock setting:
Once the pump is calibrated apply a drop of
removable wicking thread lock between the lower
pivot pin and the adjustment screw threads.
See Figure E.
3.7 Dispensing Hints:
1) Speed - Optimum results for fluids 500 cps or
less is between 120-350 rpm.
2) Cavitation: Use the largest suction tubing you
can to avoid cavitation.
3) Splashing can usually be avoided by
modifying dispense tip to larger I.D.and/or
decreasing dispense speed.
4) Hanging drop at dispense tip can be avoided
by:
a) Use of rigid discharge tubing
b) Small dispense tip
c) Increasing speed
5) High viscosity dispensing requires:
a) Large suction tubing
b) Pressurizing suction reservoir
6) Bubbles in discharge
a) Suction fitting leak
b) Cavitation
7) Need Help? Call, fax, or email us… We can
help solve almost any fluid control problem.
3.8 SPECIAL MOTORS AND CONTROLLERS
FMI offers a complete variety of stepper motors
and stepper motor controllers from simple quick
start control to complex application specific
stepper motor control. Our standard step motor
controllers are:
SCST General Purpose Stepper Motor Control for
quick start control of FMI STH and STQ pumps.
ICST Intelligent Stepper Motor Controller
which includes an embedded microprocessor
for custom programming of FMI stepper motor
pumps to meet specific application operations.
IDS 2000 Industrial Dispenser/Pump which
includes the SCST and FMI pump head integrally
mounted in a rugged stainless steel enclosure.
IN-ST431-14
6
STH00
0.002
0.025
STH0
0.005
0.050
STH1
0.010
0.100
STQ0
0.008
0.080
STQ1
0.032
0.320
STQ2
0.072
0.720
STQ3
0.128
1.280
MODEL
ML/REV
MIN
ML/REV
MAX
www.fmipump.com
800-223-3388
516-922-6050