FAQ

Frequently Asked Questions

 


Why should I partner with Eksigent?

Throughout our history, we have taken a customer focused, collaboration-driven approach to pump and product development. We have the experience to deliver quality pumps with technology that fits unmet market needs. With our pumps, your products will have all the benefits that electokinetic pumping provides.


How competitive is your manufacturing cost?

Eksigent has invested considerable time and resources into developing processes to efficiently manufacture both the Control and Pump Modules. Simple manufacturing processes readily allow for scale-up of proprietary and sensitive processes and outsourcing of all others. Even at low production levels, EKPumps (including both modules) have a cost below current commercial pump options.

 

How complex is your manufacturing process?

Eksigent’s simple manufacturing processes readily allow for scale-up of proprietary and sensitive processes and outsourcing of all others.

 

What is the stroke volume? Can the reciprocating pump do partial strokes?

The stroke volume depends on the design. For instance, our Miniflow EKPump has a stroke volume of about 45 μL and the Microflow EKPump has a stroke volume of 10 μL. Both of these pumps can do partial strokes down to 10% of full stroke volume. The partial strokes can be better controlled and repeatable if a feedback system is used. For smaller stroke volumes, please contact us.

 

Can you combine multiple pumps?

Yes, the pumps can be multiplexed or cascaded to increase the flow rate, provide continuous flow, or other flow profiles.

 

Is my fluid compatible with the EKPump? What types of fluid can be pumped?

Since the delivery fluid is separated from the EK drive fluid in Eksigent pumps, the range of liquids that can be pumped is very wide, including toxic and viscous materials. We have pumped many fluid types and have experts in material science on staff. Contact us to discuss your particular pumping application.


What is the effect of different viscosities on the pumping system?

An increase in viscosity requires more energy to move the same amount of fluid. With Eksigent’s feedback control system, EKPumps are well positioned to compensate for high viscosity fluid or fluid viscosity changes.


What is the relationship between pressure and flow rates?

By Bernoulli’s equation, for a given resistance, the higher the pressure, the higher the flow rate. A rise in backpressure will reduce the flow rate. Eksigent EKPumps are engineered to overcome or compensate for backpressure or changes in pressure.

 

What is the relationship between drive voltage and flow rate or pressure? What about current vs. flow rate?

Pressure and voltage are directly proportional; The higher the voltage, the higher the pressure. Flow rate increases when the pressure (voltage) increases. Since Ohm’s law dictates the relationship between voltage and current, the current draw also increases. We can custom design a pumping system for your specific requirements over a wide range of pressures and flow rates.

 

Do the pumps self prime?

Our Miniflow EKPump is self-priming. Others are currently being redesigned to incorporate this feature.

 

What is the affect of air bubbles?

An air bubble will cause inefficiency in the system. Eksigent pumps are designed to minimize the effect of air bubbles and pass them without user intervention.


How do you adjust flow rates?

The best way is to increase or decrease the time that voltage is applied to the engine.


What electronics are needed to drive the pump?

For the direct drive pump, a voltage regulator and a on/off switch is all that is required. For the reciprocating design, a voltage regulator, microcontroller and a H-bridge is required. More sophisticated features can be added, such as variable voltage regulators and controllers to achieve more complete pump control.


What is the driving signal?

The driving signal is a square wave with a variable duty cycle in the order of 1 Hz.


To discuss your particular EKPump application, please call 925-208-4020 or send us an email at info@eksigentllc.com.