FAQ

Welcome to our FAQ page!

Here you will find frequently asked questions about our products (microComponents: micropumps, evaluation sets, electronics, accessories) and services (MicroEngineering), functions, applications and many other topics.

We will do our best to answer all questions and hope that our answers will help you to solve your problem.

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mp6

If the pumps behave erratically, it is very often caused by improper priming. If air is still inside, which is on the one hand compressible and on the other hand uncontrollable to know when such an air bubble starts to come out, the flow rate can vary a lot.

NOTE:  For priming run the pump at max settings. The beginning of the priming may be difficult as plastic materials are in general hydrophobic, so that air bubbles may remain inside.

If the liquid is not degassed and remains inside the pump tiny gas bubbles will appear on the interior surfaces after some time. It is the same effect as in a glass of tap water. These gas bubbles are compressible and eat up a bit of actuator stroke and compression that lead to decreasing pump performance.

With high amplitudes of the pump the motion stress of the liquid is high and gas bubbles can be detached from the surfaces and transported out. The lower the amplitude of the pump the weaker the speed changes of the moved liquid during the actuator strokes hence gas bubbles are not removed.
Category: mp6

The micropump has an backflow when turning off, but this depends on the pressure in the system. The pumps are designed fluidically open, that means the passive valves inside the pump open on dynamic pressure changes. However, the valves are not completely leak tight and there will be a certain backflow – liquid or air – when a pressure difference exist. For a system where a pressure level has to be kept up it will be better to use a good sealing valve like our mp-cv. Combined with a simple pressure sensor that monitors the pressure level it is possible to build a system where the electronic will trigger the pump to raise the pressure again once the level dropped below a certain value. It is absolutely possible to let the pump run continuously keeping the pressure level up. No damage occurs due to constant action. With max setting, for instance max amplitude and 300 Hz, the max air pressure will be maintained. Pressure levels will be possible with different amplitudes, but this requires some experiments depending on the pressurized volume.

Category: mp6
  • The mp6 has two piezo actuators in order to achieve a reliable and reproducible pumping performance.
  • The mp6 reaches a maximum back pressure of up to 600 mbar and a maximum flow rate of 8 ml/min at 100 Hz, 250 Vpp and SRS signal for liquids.
  • For gases the characteristics are 25 ml/min and a back pressure up to 150 mbar with 300 Hz, 250 Vpp and SRS signal.
  •  The flow rate of the pumps shows a linear dependency on the back pressure. At 0 mbar back pressure the maximum pump rate can be achieved and at the maximum back pressure the flow rate is decreased to 0 ml/min. The amplitude defines the stroke of the actuator and therefore the displacement of the pumping media per pump cycles. Increase in amplitude linearly increases the flow rate to the maximum. The frequency determines the number of pump strokes over time. Volume flow increases linear with frequency for a certain frequency range. The micropump shows a good self-priming behavior and high bubble tolerance when pumping liquids.
  • The mp6 has only material, polyphenylene sulphone (PSSU), in contact with the pumping fluid.
  • 100 % tested Fluids: For both, liquids and gases
  • (The mp6-pi and mp6-pp are special micropumps and have different specifications and materials)
Category: mp6

The pump cable has to be inserted with the contact surfaces orientated down into the plug. Both components are firmly connected by closing the white plug. When disconnecting the pump, the board connector must first be opened! Verify yourself that the board connector is always locked before start running the pump. Otherwise, this will lead to a malfunction of the pump or the electronics. For an illustrated view please check here our connector configuration for the mp6 micropump.

 

Categories: Electronics, mp6

Due to the functional principle of the piezoelectric diaphragm pumps a pulsation free flow can’t be generated with just the pump. We would recommend to use a damper, for example our developed mp-damper. However, as the displaced volumes are very low the pulsations are much lower than the ones from conventional membrane pumps. The pulsation can be further minimized by using the sine signal and an elastic tubing.

A-B – A-B

A-B is one mp6 with A the first and B the second actuator inside. If two pumps are connected in series the actuators A should be moving simultaneously and actuators B also simultaneously but with a 180° phase shift to actuators A.

However, the connection length between the pump has some influence.

The pulsation pulse from the first pump travels along the fluidic line. Theoretically the speed of the pulsation is the speed of sound in the pumped media. With the distance between B.1 and A.2 – actuator center here, which is 7.5 mm from casing wall (not the tubing clip) – the run time of this pulsation can be calculated. Hence is the pulsation of the second mp6 could be tuned to this, i.e. the phase shift between the pumps delayed a bit. Additionally, another effect occurs: The longer the fluidic line the more blurred is the pulsation peak, which will make the add up smaller. Also keep in mind that if you bend the tubing between the pumps the pulsations follow the bend but will be blurred further.

Category: mp6

The functional principle of the Bartels micropumps is based on a piezoelectric diaphragm in combination with passive check valves. A piezo ceramic mounted on a coated brass membrane is deformed when voltage is applied. By the resulting down stroke, the medium is being displaced out of the pump chamber below. The check valves on both sides of the pump chamber define the flow direction. When the voltage decreases, the corresponding piezo deformation causes an upstroke of the membrane. The medium is sucked in and the chamber is filled again. In every second, the pump can do several hundreds of such pumping cycles. The pumping performance can be influenced by adjustment of the parameters.

Category: mp6

The piezo actuators are driven by the electronic controller connected to the micropump. When the driving signal has fast amplitude changes and the set frequency is in the range of human perception, a sound can be heard. If a sinusoidal signal is used within low frequencies (e.g. up to 200 Hz), the lowest sound generation is reached. If a rectangular signal is used, the highest sound generation will be reached.

Category: mp6

The controllers mp-Labtronix, mp-Highdriver and mp-Lowdriver from Bartels Mikrotechnik are optimized for driving a single mp6 pump. The mp-Highdriver4 allows controlling up to four mp6, mp6-pi, mp6-pp or mp6-gas micropumps up to a frequency of 800 Hz. For evaluation purpose the mp-Multiboard can be used and is able to implement one of the driver chips, to give an easy set up to test the micropumps and the driver chips.

For serial applications we offer customized electronics that can be tailored to the customers’ requirements. Please contact us for more details.

Categories: Electronics, mp6

The mp6 micropumps have been tested running at humidities from 95% to ~10%. These shortterm tests can not give hints regarding long-term usage, as water can appear at electric connections inside Molex connector and beneath the lid where the actuators are.

If you allow for a drying step (time unknown) of attached liquid after extreme humidity storage, the pump should be fine afterwards.

Categories: mp6, Quality

If the pressure is the same inside and outside the pump, i.e. one tube connector is open to the surrounding, you can store it at any pressure you want. When the pump is inside a bag with some air and the bag is put under pressure this will be the same.

Category: mp6

The approximate volumes are the following:

  mp6
max. pump stroke

(100 Hz, 250 V, SRS)

~ 1.6 µl
dead volume

(100 Hz, 250 V, SRS)

~ 3.5 µl
total inner volume ~ 27 µl
Category: mp6

It is possible to push a host clamp over the attached tubing end to clamp it tightly to the connector. For a good sealing we recommend our mp-hc which gives a good sealing regarding leaking.  Another option is to use a wire ferrule. The ferrule doesn’t have to be crimped. If crimping is required for a very strong fixation, please make sure that the ferrule does not create such a deformation that a gap appears again. With mp6 and Tygon tubing (mp-t ID 1.3) a wire ferrule for 4 mm² (internal diameter 2.8 mm) is very good. For other tubing ferrules with other diameter have to be tested.

Category: mp6

We guarantee a lifetime of minimum 5.000 continuous working hours under lab conditions for the micropump mp6 series (>10.000 hours have been achieved without any notable failures). These values have been achieved by using a micropump from the mp6 series tested with the mp-Labtronix controller at 250 Vpp, 100 Hz for liquids and 300 Hz for gases and SRS signal. Even if we have reached more than 10.000 hours the warranty period of 5.000 hours has to be shared in this form, as the piezo supplier just guarantees this value.

For information: The main causes for breakdown for long running times are the piezoceramic of the actuators and clogging of the fluidic path. Clogging can be avoided by filtering. The piezo elements can be dam-aged by recurring voltage/current-spikes. If the switch-on and switch-off action is done properly, i.e. without any voltage/current-spikes of the driving signal, the actuator will remain intact.

 

Categories: mp6, Quality

Please find here an example for lower flow rates which were generated with the mp-Lowdriver and the mp6 micropump.

 

Category: mp6

This is not fully tested.

Internal there were tests made in which the mp6 micropumps could reach 3 µl/min. It might be able to go lower.

The lowest flow rate is very dependent on the conditions in the customers test system. Generally, a flow rate of about 20 µl/min for liquids can be achieved in most cases. With thorough optimization much lower rates can be achieved. In order to ensure stable pump performance, if possible, the frequency should be lowered first and the amplitude should be kept as high as possible. If necessary, a precision orifice can be used to limit the outlet flow additionally.

Category: mp6

The main causes for breakdown for long running times are the piezoceramic of the actuators and clogging of the fluidic path. Clogging can be avoided by filtering. The piezoceramic can be damaged by recurring voltage/current-spikes. So if the switch-on and switch-off action is done properly, i.e. without any voltage/current-spikes of the driving signal, the actuator will survive. If not, the piezoceramic will be damaged and the performance of the micropump will decrease.

Category: mp6

All wetted materials inside the standard mp6 are PPSU.. Please note that the mp6 is made with material of two grades of PPSU; natural-transparent and black. The lid is black. Radel R-5000 NT is the natural-transparent material and Radel R-5100 BK 937 is the black material. The black PPSU material has some part of carbon black. The other materials do not have carbon added. However, the mp6 applies the technologies of laser welding and laser marking. The marking process is used to create an absorbing layer for the laser wavelength in the otherwise natural-transparent material. This absorbing layer is hence blackened material and thus carbonized or in some manner burnt. The following laser welding process on this blackened layer will melt the material of and around the black end part. It may be possible that some particles of this carbonized plastic material will come out of the pump during operation. The stamped valve foil, also PPSU, will never produce any particles; if that happens the pump will be heavily damaged.

Categories: mp6, Quality

Maximum pressure: With the current design of the mp6 the maximal pressure to achieve is limited by the actuator. It can generate only a certain force, once this force is reached the actuator doesn’t move anymore. Due to the tolerances of the actuator this force limit is no exact value.

So far, we have experienced that – in systems of three serial connected pumps pumping water – a max pressure of 1.6 to 1.7 bar is possible. The last actuator is then strongly bulged out and moves with a very low stroke only. Adding more pumps brought no further pressure gain.

Therefore, if more pressure is needed a more powerful actuator would be the best solution. This can be achieved with a smaller diameter of the actuator. It is then generally stiffer than the larger diameter and can generate more force hence more pressure. However, as the actuator stroke goes down with actuator diameter the flow rate goes down with it. It is also possible to have a stronger actuator without changing the membrane diameter, but this will require different actuators, e.g. piezo multilayer bender or piezo stacks. We have some initial concepts here already. For more information, please contact us.

 Operating pressure: The allowed differential pressure (inside pump to surrounding) is roughly 1.2 bar (120 kPa). However, we have found that pumps could withstand 2 bars too, but we can’t guarantee this as we don’t have so much data about this. However, if higher pressures are applied instantly the pump may be destroyed; slow increasing/decreasing pressure is ok.

In series connection the pumps can generate more pressure than one single pump. In such a system we have achieved 20 psi (1.37 bar or 137 kPa) without destruction of the last pump in line. But again, we guarantee only the 1.2 bar as these are tested in production.

Category: mp6

We don’t have data on particle effects with the mp6-gas micropump. The mp6-gas is also possible to pump liquids. In general, the mp6-gas is just a standard mp6 pump, only tested especially for air performance, not every mp6 achieves the air specification due to part and production tolerances.

Note: If you have pumped liquid and want to pump gases with particles after that, please dry the pump sufficiently. Otherwise particles can get stuck to internal surfaces due to liquid remains. Pumping gas without particles for some time will help here. If water is used, it is also possible to vaporize it with the pump at a temperature of approx. 70°C for roughly an hour. We have some good experience with this procedure.

Category: mp6

The data sheet mentions 0-70°C, but this is based on water. Zero simply because of ice creation, because ice has an expanding character and may destroy the pump. This is actually the cause for the storage concern here too. At a temperature of 70°C water begins to create air bubbles like in a cooking pot. These air bubbles will combine and disturb the pump due to its compressive behavior. The pump will then behave as it´s un-primed. So, if other liquids are used than water the temperature range may be different. For instance, with a cooling liquid that stays liquid below 0°C the pump will be still operational. Please note that we can’t guarantee these “enlarged” temperatures as we don’t know what liquid has whatever effects on the pump when the temperature changes that way.

Category: mp6

The mp6-series micropumps always work corresponding to the pump curve, which is based on the maximum flowrate (at zero pressure) and the maximum pressure (at zero flowrate). The curve of pressure and flowrate combinations that are directly achievable with the mp6 micropump is a straight line between these two values, it depends on further components within the fluidic system. When the pump is running and the outlet is closed so that no flow rate is possible the pump will generate the max pressure. When the outlet is open the pump can achieve the max flow rate. If there is a back pressure on the outlet, the flow rate is reduced by this. Note that each tubing and component connected to the pumps fluidic system will have an own fluidic resistance (like electrical resistors in an electric circuits), which can be compared to a certain back pressure, and the max flow rate is slightly reduced.

Same applies to a pressure on the inlet.

With forward pressure the pump is not reduced in performance and can add its flow rate to the pressure induced flow rate.

In case that the inlet has a negative pressure like a slight vacuum, the pump would be reduced a bit as it has to overcome this before a flow rate is realized. Thus, a negative inlet pressure can be compared to a backpressure on the outlet.

An additional thing to know is that the pump is designed fluidically open, that means liquid can pass the pump due to differential pressure. In forward direction this is easy as the internal pump valves open. In reverse direction there is a leak flow, as the pump valves are not completely tight. If you want to prevent back flow we recommend using a checkvalve like our mp-cv.

At the moment we don’t have a valve that prevents flow in forward direction, as this requires a certain opening pressure of the valve, but we are currently in the process of designing one.

However, with such a valve the pump needs to open the valve first, i.e. create some pressure which will reduce the max flow rate, before a resulting flow can happen.

If your current application is sensitive to the existing inlet pressure, it is always possible to compensate the pump by decreasing the amplitude a bit.

Category: mp6

Liquids: The maximum fluidic power is generated by a pump when operating it at half of the maximum flow rate and half of the maximum back pressure. Therefore, these operating conditions will be considered in the following:

Operating the mp6 micro pump with water at its maximum fluidic power, this equals a flow rate Q of 3,5 ml/min and a pressure p of 300 mbar. Multiplying flow rate and pressure yields a fluidic power of 1,76 mW. Assuming a total capacitance of 16 nF for the pump piezos, a maximum driving voltage of 250 V and a driving frequency of 100 Hz the electrical power consumption of the pump is 50 mW. This equals a pump efficiency of about 3,5 %.

Gases: Operating the mp6-gas micro pump with air at its maximum fluidic power this equals a flow rate Q of 10 ml/min and a pressure p of 50 mbar. Multiplying flow rate and pressure yields a fluidic power of 0,75 mW. Assuming a total capacitance of 16 nF for the pump piezos, a maximum driving voltage of 250 V and a driving frequency of 300 Hz the electrical power consumption of the pump is 150 mW. This equals a pump efficiency of about 0,5 %.

Category: mp6

In principle it is possible to pump blood with the mp6 micropump. There might be some damaging of blood cells (red blood particles), but only with certain pump settings. The optimal pump settings has to be tested. Our recommendation is to avoid the rectangular signal or high frequencies which both would force rapid and sharp motions of the pump valves, and which could squeeze blood cells to hard.

Hence, trying the sine signal and playing with frequency and amplitude to achieve desired flow rate with as less damage as possible is the best way to achieve successfully work with blood.

Category: mp6

No, due to the passive check valves the micropump mp6 series can only pump in one direction. They are not designed to have a reversible flow. If a negative pressure difference is applied, only a very small backflow is possible, if that pressure becomes too large the pump valves can be damaged. The reason of the slight backflow is that the valves are not intended for static pressure sealing; hence they are better suited for dynamic movement. That means they are designed “fluidical open”, i.e. pump valves can open with differential pressure in forward direction. However, as the pumps are fluidically open while switched off, two pumps can be connected in opposite direction to provide bidirectional flow. Due to the fluidic resistance this will however limit the maximum performance. Nevertheless, there are certain ways as using active valves in combination with the micropump to achieve a reversible flow/ bidirectional flow.

Category: mp6

The micropumps are capable of moving liquids with particles up to 50 µm. The smaller the particles the less risk of blockage. Depending on the particle material the particle load has influence. The higher the load the higher the risk of blockage. Blood particles are squishy and deformable which is not as problematic as for instance hard glass particles. Fibres are the most problematic particles as they easily get stuck.

If particles clog the pump different effects can be possible:

  • Pump rate may go down a bit with particles ladden media (based on liquid experiments), but this doesn’t need to indicate a possible blockage.
  • Partly blockage is present if the flow decreases further and does not recover when a media with no particles is pumped.
  • Severe blockage is present if flow and pressure generation is very low and cannot be regained.

It may be possible to clean the pump by pumping liquid for some time (TBD). However, if blocking particles can be rinsed out depends on the particles and the liquid as well as the kind of blockage. Fibres are nearly impossible to remove, same applies for very large particles.

Category: mp6

The pump can work even well below 1Hz (if necessary) but not every Bartels driver does support it.

The mp-Labtronix controller has a frequency range of 1-300 Hz. The mp-Highdriver4 and the mp-Highdriver have a lower frequency limit of 50 Hz. This cannot be disabled or changed. The mp-Lowdriver has a typical frequency range of 8-2000 Hz, but these Bartels electronic can work at 1 Hz as well, but each electronic just can control one micropump.

Categories: Electronics, mp6

Please consider our TechNote of the sterilization methods of the mp6 micropumps. For ebeam and gamma sterilization we had a customer project where a system with the pump was tested before and after the sterilization processes. No impact of the processes could be detected, except for a slight change of the colour. Functionality and flow rate were unchanged. For both methods the radiatons of 15, 25 and 40 kGy were experimented successfully.

Categories: mp6, Quality

The storage best temperature range is: -20°C – 70° Celcius

But as long as the pump is stored without any liquid, i.e. water, there is no known limit to negative temperatures (Celsius). Positive temperatures are limited to ~130°C, regardless of liquid inside, as at that temperature the piezo ceramic and the applied adhesives will start to deteriorate.

Category: mp6
  • Short: yes, it is possible to transport mixtures.
  • If the pump can process both of the liquids the flow rate may change due to viscosity of the liquid currently inside the pump. For instance, if a succession of water-gas-water-gas volumes with one pump setting (amplitude and frequency) is wanted, the flow rate will increase with the gas phase and drop back with the liquid phase. Same will happen with two differently viscous liquids, though not as drastic as with air-liquid.However, when the separating front of the two media goes into the pump it will be blurred a bit when it comes out again. This means the separation between the two media will not be a sharp front, but a kind of mixture section in between. With air-water there will be some foamed section (which may collapse after some travelling along the tube line), with two liquids, there will be a real mixture (example: a succession of red and blue water entering the pump will come out as violet in this mixture section). How large this mixture section will be or if it will be there at all has to be tested, as this is also dependent on the pump settings and flow rate.

 

Category: mp6

A Pressure reservoir could be set to contain overpressure or vacuum. A valve would then be the required precise tool letting the vacuum or overpressure gain access to the test tubing. Two 2/2 valves or one 3/2 valve would be used to apply vacuum or overpressure to the test tubing.

The general work process of such a device would consist of:

1) The pump(s) building up pressure/vacuum. A pressure sensor would be used for loop control.

2) Once pressure is at desired level the valve(s) can be activated.

3) Valve(s) would be activated and would release the pressure/vacuum to push/suck liquid in/out of the test tubing.

 

Benfits of this approach:

  • The pump(s) would only work sporadically, resulting in:
    • lower energy consumption,
    • no constant noise,
    • no “on-demand-high-precision” pump action,
    • higher overall pump life expectation.
  • Pressure/vacuum reservoir: The size of the reservoir can handle multiple “analysis runs” with high repeatability

Drawbacks:

  • More technical effort is required (pressure reservoir, sensors, valve for closed loop operation)
Category: mp6

Pumps in series connection can be used in order to create underpressures on the inlet side. The underpressure that can be reached follows an exponential curve with multiple pumps, at a certain point further pumps cannot build up further underpressure. For the first pump, the output pressure is a good lead in terms of what underpressure can be reached on the inlet side.

Category: mp6

The optimum frequency should be selected based on the medium: 100 Hz for water, 300Hz or higher for gases, 50Hz or lower for oils. Thereafter, the position of the working line of the pump (straight line from maximum pressure to maximum flow) depends on the used amplitude and shifts almost parallel to the origin when it is reduced. Since the operation with gases is more flexible, both amplitude and frequency can be used to control the flow rate (and pressure). The actual flow rate always depends on the working line and the existing backpressure in the system. The value pair of flow and pressure is always on the working line which is conditional to the selected operating parameters (frequency and amplitude).

Categories: Electronics, mp6

Here you can find a diagramm for the flow rate behaviour of the mp6 micropump with viscosity over frequency.

Category: mp6

Everything needed is supplied by the electronic controllers offered by Bartels Mikrotechnik. The combination of signal, amplitude and frequency defines the performance of the micropump.

For laboratory applications, there is the extended micropump control mp-Labtronix. It is able to drive one micropump mp6, mp6-pi, mp6‑pp or mp6-gas with different driving signals, the full range of amplitude and frequency manipulation and has an USB interface.

For quick starting with the micropumps, the evaluation board mp-Multiboard offers a flexibility via an Arduino board and comes with an easy user interface and the opportunity to get access for testing all three different driver chips offered by Bartels Mikrotechnik.

For integration purposes in mobile devices, in devices of small construction sizes and generally onto PCBs of any kind, the OEM driver chips mp-Highdriver, mp-Lowdriver and mp-Highdriver4 were designed to offer most of the functionality required to drive the micropumps.

Categories: Electronics, mp6

All wetted materials inside the standard mp6-liq and mp6-gas are PPSU (PPSU and PI for the mp6-pi, PP and PI with the mp6-pp).

The mp6-series micropumps are made with material of two grades of PPSU: natural and black. The lid is black and the body transparent, this improvement will allow the visual detection of air bubbles and particles in the pump chambers.

The black PPSU material has some part of carbon black, see the related material safety data sheet for details. The other materials do not have carbon added. The mp6-series micropumps apply the technologies of laser welding and laser marking.

The adhesives that are used in the mp6 assembly are not in any contact with the liquid. However one of them, an epoxy, may contain carbon.

Category: mp6

Electronics

The pump can work even well below 1Hz (if necessary) but not every Bartels driver supports it. The mp-Labtronix controller has a frequency range of 1-300 Hz. The mp-Highdriver4 and the mp-Highdriver have a lower frequency limit of 50 Hz. This cannot be disabled or changed. The mp-Lowdriver has a typical frequency range of 8-2000 Hz.

Category: Electronics

Please check here our comparison chart for our different drivers

Category: Electronics

The pump cable has to be inserted with the contact surfaces orientated down into the plug. Both components are firmly connected by closing the white plug. When disconnecting the pump, the board connector must first be opened! Verify yourself that the board connector is always locked before start running the pump. Otherwise, this will lead to a malfunction of the pump or the electronics. For an illustrated view please check here our connector configuration for the mp6 micropump.

 

Categories: Electronics, mp6

The mp6 micropump series can be controlled with alternating voltages at a maximum amplitude of 250 V and frequencies between 0 and 800 Hz. A rectangular signal results in best fluidic performance, while a sine wave minimizes the audible noise. The mp6 micropumps contain two actuators. This means that two signals with 180° phase shift need to be applied. A single pump equals a capacitive load of 2 x 8 nF.

Maximum ratings:

Voltage amplitude Vpp (not RMS): 250 Vpp

Maximum negative voltage swing: -50 V

Frequency: 300 Hz

If a pump gets damaged while using a customers’ controller we do not provide any warranty. For evaluation, we recommend the use of our dedicated controllers. Based on the evaluation results we can develop a specific controller for your application. Please contact us.

Category: Electronics

In general both parameters can be used. As lower amplitudes lead to lower compression in the pump chamber, it is better to do fewer large pump strokes over time. Therefore, try to work at a high amplitude level and decrease the frequency until you reach the required flow rate level. In case the flow pulsation is too high, the amplitude should be lowered and frequency increased.

Category: Electronics

The controllers mp-Labtronix, mp-Highdriver and mp-Lowdriver from Bartels Mikrotechnik are optimized for driving a single mp6 pump. The mp-Highdriver4 allows controlling up to four mp6, mp6-pi, mp6-pp or mp6-gas micropumps up to a frequency of 800 Hz. For evaluation purpose the mp-Multiboard can be used and is able to implement one of the driver chips, to give an easy set up to test the micropumps and the driver chips.

For serial applications we offer customized electronics that can be tailored to the customers’ requirements. Please contact us for more details.

Categories: Electronics, mp6

One big advantage of the mp-Labtronix controller is the possibility to set the whole range and combinations of all parameters:

Frequency: 1 – 300 Hz,

Amplitude: 1 – 250 Vpp; asymmetric

Three different wave forms: Sine, Rectangular, SRS

Using liquids, the signal form SRS should be used, a good starting point is 250V amplitude and 100 Hz frequency. For high viscous liquids, frequencies below 100 Hz are preferred, while for gases the frequency ranges above 100 Hz provide the best results. The optimal frequency needs to be determined individually. If the application is very sensitive to noise, the sine signal should be used instead.

Category: Electronics

Driving the micropump with the mp-Labtronix allows you to gather comprehensive results in short time. You will also be able to consider the sometimes complex interaction of micro- and macrofluidics with direct measurements of your system right from the beginning. Furthermore you will also be able to conclude about how to integrate the micropump into any of your systems.

For that purpose you can connect the mp-Labtronix via USB-port with a PC, manually control it with the NI‑LabView interface and turn it into a fully automatized control. Experiments with systems in which pressure-, flow- or other –sensors gather additional data are easily achievable. You can start with basic LabView routines that we implemented already for you.

Independent of the NI‑LabView develop environment you can choose every other computer language that can handle the communication with an emulated serial interface.

Category: Electronics

The pump can work even well below 1Hz (if necessary) but not every Bartels driver does support it.

The mp-Labtronix controller has a frequency range of 1-300 Hz. The mp-Highdriver4 and the mp-Highdriver have a lower frequency limit of 50 Hz. This cannot be disabled or changed. The mp-Lowdriver has a typical frequency range of 8-2000 Hz, but these Bartels electronic can work at 1 Hz as well, but each electronic just can control one micropump.

Categories: Electronics, mp6
  • The mp-Labtronix controller generates three different signal forms: SRS, Sine, Rectangular.
  • The mp-Lowdriver generates only sine and a customized signal form.
  • The mp-Highdriver and the mp-Highdriver4 generate different signal forms: sine, rectangular and other.
  • The signal form for the mp-Multiboard depends on the used driverchip.
Category: Electronics

The optimum frequency should be selected based on the medium: 100 Hz for water, 300Hz or higher for gases, 50Hz or lower for oils. Thereafter, the position of the working line of the pump (straight line from maximum pressure to maximum flow) depends on the used amplitude and shifts almost parallel to the origin when it is reduced. Since the operation with gases is more flexible, both amplitude and frequency can be used to control the flow rate (and pressure). The actual flow rate always depends on the working line and the existing backpressure in the system. The value pair of flow and pressure is always on the working line which is conditional to the selected operating parameters (frequency and amplitude).

Categories: Electronics, mp6

Everything needed is supplied by the electronic controllers offered by Bartels Mikrotechnik. The combination of signal, amplitude and frequency defines the performance of the micropump.

For laboratory applications, there is the extended micropump control mp-Labtronix. It is able to drive one micropump mp6, mp6-pi, mp6‑pp or mp6-gas with different driving signals, the full range of amplitude and frequency manipulation and has an USB interface.

For quick starting with the micropumps, the evaluation board mp-Multiboard offers a flexibility via an Arduino board and comes with an easy user interface and the opportunity to get access for testing all three different driver chips offered by Bartels Mikrotechnik.

For integration purposes in mobile devices, in devices of small construction sizes and generally onto PCBs of any kind, the OEM driver chips mp-Highdriver, mp-Lowdriver and mp-Highdriver4 were designed to offer most of the functionality required to drive the micropumps.

Categories: Electronics, mp6

The SRS signal is an optimized waveform generated by the mp-Labtronix controller to drive the actuator more efficiently. It makes the pump work at a lower sound level with increased long-term stability of the flow rate. The SRS signal is used as the standard driving waveform.

Category: Electronics

Quality

The mp6 micropumps have been tested running at humidities from 95% to ~10%. These shortterm tests can not give hints regarding long-term usage, as water can appear at electric connections inside Molex connector and beneath the lid where the actuators are.

If you allow for a drying step (time unknown) of attached liquid after extreme humidity storage, the pump should be fine afterwards.

Categories: mp6, Quality

All our mp6 micropumps were 100 % tested. They have to pass a final inspection before delivery.

Category: Quality

We guarantee a lifetime of minimum 5.000 continuous working hours under lab conditions for the micropump mp6 series (>10.000 hours have been achieved without any notable failures). These values have been achieved by using a micropump from the mp6 series tested with the mp-Labtronix controller at 250 Vpp, 100 Hz for liquids and 300 Hz for gases and SRS signal. Even if we have reached more than 10.000 hours the warranty period of 5.000 hours has to be shared in this form, as the piezo supplier just guarantees this value.

For information: The main causes for breakdown for long running times are the piezoceramic of the actuators and clogging of the fluidic path. Clogging can be avoided by filtering. The piezo elements can be dam-aged by recurring voltage/current-spikes. If the switch-on and switch-off action is done properly, i.e. without any voltage/current-spikes of the driving signal, the actuator will remain intact.

 

Categories: mp6, Quality

All wetted materials inside the standard mp6 are PPSU.. Please note that the mp6 is made with material of two grades of PPSU; natural-transparent and black. The lid is black. Radel R-5000 NT is the natural-transparent material and Radel R-5100 BK 937 is the black material. The black PPSU material has some part of carbon black. The other materials do not have carbon added. However, the mp6 applies the technologies of laser welding and laser marking. The marking process is used to create an absorbing layer for the laser wavelength in the otherwise natural-transparent material. This absorbing layer is hence blackened material and thus carbonized or in some manner burnt. The following laser welding process on this blackened layer will melt the material of and around the black end part. It may be possible that some particles of this carbonized plastic material will come out of the pump during operation. The stamped valve foil, also PPSU, will never produce any particles; if that happens the pump will be heavily damaged.

Categories: mp6, Quality

Please consider our TechNote of the sterilization methods of the mp6 micropumps. For ebeam and gamma sterilization we had a customer project where a system with the pump was tested before and after the sterilization processes. No impact of the processes could be detected, except for a slight change of the colour. Functionality and flow rate were unchanged. For both methods the radiatons of 15, 25 and 40 kGy were experimented successfully.

Categories: mp6, Quality

We are providing our testing and measurement equipment data setups on request, allowing to test and evaluate the micropumps in the same way as at our product release test.

When selecting sensors, please be aware, whatever sensor you apply, make certain to have the correct frequency level of detection for your data receiver (PC or other), otherwise the frequency generated by the micropumps might lead you to misinformation due to statistical errors.

As data logging software, National Instruments “LabView” is recommended in order to control devices, read out sensors, calculate and display graphs of sensor data and store them in text, data or excel-files. Here it will be necessary to generate code with LabView. It is a graphical coding in-terface where you place icons and connection lines on the screen, so the code will not have to be typed. LabView is very customizable. Interface hardware form National Instruments will be re-quired to receive sensor data with a PC.

Category: Quality

Applications/ Case studys

Evaluation kits

  • With the mp-basic kit you receive all components you need to test our mp6 micropump. Thanks to the mp-Multiboard and the corresponding software, you can test our micropump directly in your system.
  • The mp-Lab! kit goes into more detail. With the laboratory electronic mp-Labtronix you act comfortably in laboratory applications for the micropump, but also for intensive test series.
  • The mp-advance kit connects our mp6 micropump with flow sensors, pressure sensors, active valves or microfluidic chips. Now you can build and test an active microfluidic system including controlling software with our micropump.
Category: Evaluation kits
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Contact

Bartels Mikrotechnik GmbH

Konrad-Adenauer-Allee 11

D-44263 Dortmund

Tel: +49-231-47730-500

Fax : +49-231-47730-501

E-Mail: info@bartels-mikrotechnik.de

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