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INTRODUCTION
Laboratory and industrial procedures often require metering precise amounts of fluids in a controlled and
reproducible manner. Optos pumps were developed in response to this need. These pumps are capable of
delivering measured amounts of fluids against significant backpressure.
Pump Features Include:
Piston wash chamber for backflushing piston to extend seal life.
Electronic control of piston motion to minimize pulsation.
Optional pulse damper for further pulse reduction.
Easy to use interface for flow setting and other pump parameters.
Metal-free options
Principles of Operation
Optos pumps attain precise metering at intermediate and high pressures by a positive displacement, reciprocating
piston. The piston is driven by a stepper motor via an eccentric. Advanced software algorithms control motor
speed based on piston position, achieving rapid fluid intake and smooth, constant fluid delivery, minimizing
pulsation. Additional reductions of pulsation can be achieved by use of the optional damper.
Ball and seat inlet and outlet valves ensure precise metering. The suction created by the piston retracting to refill
the piston chamber pulls the inlet ball off the inlet seat allowing fluid to travel through the inlet check valve.
Simultaneously, the outlet ball is pulled back onto its’ seat, preventing fluid from exiting the piston chamber.
During the delivery portion of the piston’s duty cycle, the inlet ball is pushed back onto its’ seat as the piston
moves forward, preventing fluid from travelling back to the pump reservoir. Simultaneously, the outlet ball is
forced off its’ seat, allowing fluid to exit the outlet valve. For the valves to operate effectively, a pressure
differential of at least 25 psi is required on the outlet side of the pump.
The pump’s flow rate is set directly in mL/min. using the up and down buttons on the user interface. Flow rates
are determined by piston displacement (diameter, and stroke length) and motor speed.
Some Optos pumps may be fitted with a pulse damper. The damper is a diaphragm type damper, where a
diaphragm made of an inert material flexes against a compressible fluid (spiked with red dye), thereby absorbing
pulses in fluid delivery. To maximize the damper’s efficiency, the system should operate against at least 500 psi.
If your system does not normally generate such pressures and you wish to increase the efficiency of the damper,
you can install a backpressure device, or some narrow ID tubing downstream of the pump.
Materials of Construction
The materials used for the liquid end of your Optos Pump were carefully chosen for corrosion resistance. The
piston is sapphire, and the inlet and outlet valves incorporate sapphire seats and ruby balls.
The piston seal material is made from specially formulated PTFE and has excellent chemical compatibility
characteristics.
The liquid end housing is made of passivated type 316 stainless steel because of its superior resistance to
corrosion. In applications requiring the use of chemicals corrosive to type 316 stainless steel, you may order a
PEEK (polyetheretherketone) liquid end or one made of Hastelloy.
About This Manual
This manual provides instructions and information on Optos metering pumps.
Section II of this manual, beginning on page 8, describes the unpacking, location, and initial installation of your
metering pump. Section III, beginning on page 11, describes the operation of the Optos hardware and the menu
system in detail.. Section IV, beginning on page 16, describes maintenance procedures. Section V, beginning on
page 20, contains appendixes, including, lists spare parts and accessories for the various pump models.
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