
Publication 5390-001 Revision B
3
Har
v
ard Appar
atus Model 33
T
win Syr
inge Pump User's Man
ual
Specifications
Harvard Pump 33 Specifications
Accuracy
±0.35%
Reproducibility
±0.1%
Type
Dual Syringe Infusion/Withdrawal Parallel/Reciprocal
Size, L x W x H
(286 x 311 x 152 mm) 11.25 x 12.25 x 6 in
Weight
(6.8 kg) 15 lbs
Power
115/230 VAC, 50-60 Hz via selector switch, 45 W
Fuse
1 A (115 V), 0.5 A (220 V)
Leakage to Ground
Typically < 10 µA
Ground Resistance
Typically < 0.06
Ω
Voltage Operating Range
95-130 VAC, 220-260 VAC
Drive Motors
2 motors, each 0.9 degree steppers
Motor Drive Circuitry
Microprocessor controlled from 1/2 to 1/4 microstepping
Timing Belt Drive
2:1
Lead Screw Pitch
24 threads/inch
Motor Steps per One
1600 at 1/2 stepping or 3200 at 1/4 stepping
Revolution of Lead Screw
Step Rate:
Minimum
27.3 sec/step
Maximum
416.7 µsec/step
Pusher Advance per Step:
Minimum
0.330729 µm
Pusher Travel Rate:
Minimum
0.726699 µm /min
Maximum
95.25 mm/min
Dynamic Speed Range
131,072 to 1
Force
40 lbs max.
Pressure
99.5 PSI max. with 20 ml stainless steel syringe
Calibration
Enter syringe diameter, any size, any make, up to 50 mm
diameter
Syringe Size
10 µl (min.), 50 ml (max.)
Flow Rate Range:
Minimum
0.0073 µl/hr (10 µl syringe)
Maximum
53.346 ml/min (50 ml syringe)
Display
5 digits plus 14 indicator LEDs
RS-232 Interface
Chained dual bidirectional ports
Non-Volatile Memory
Storage of all settings