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Burkert’s CMOSens mass-flow controller technology (MFC) has enabled Plasma Surgical to develop Plasmajet, a plasma surgery system for surgical cutting and coagulation.

Plasmajet is a virtual scalpel that enables surgeons to achieve more, with less damage to tissue.

It comprises a console, which houses the control system with LCD display and touchpad, a service trolley and a range of single-use hand pieces.

There is also an integrated cooling circuit, which uses Burkert fluid control valves to cool the tip of the hand piece.

FDA-approved, the Plasmajet system cuts and coagulates tissue with a fine beam of electrically neutral, high-energy plasma.

This is generated by ionising a low flow of inert argon gas within the insulated body of a single-use hand-piece.

The gas is excited into a plasma state and emerges from the tip of the hand piece as a precise pale-blue jet stream.

For the system to work properly, the MFC first has to provide the high-pressure/high-flow rate required to ignite the plasma, and then ramp down to tenths of slpm.

It is important that there is no over-shoot, to prevent the plasma beam from being lost.

Burkert’s brief was to provide an MFC that would avoid this problem, controlling the low flow rates with a repeatable accuracy of +/-0.01 slpm.

Other elements of the specification required that the MFC should be suitable for use in EMC noisy environments (each unit is sited below a large 3.5kV power supply and has two fans working at low frequency); that each MFC should be stable between 25 and 40C; and that manufacturing tolerances should ensure each MFC has the same settling time.

The Plasmajet application includes CMOSens technology integrated into 8711 MFC that operates according to a thermal principle that delivers the mass flow without any corrections for the required pressure or temperature.

The actual flow rate is detected by a sensor embedded in the wall of a specifically designed bypass channel, into which a small part of the total gas stream is diverted, ensuring laminar flow conditions.

The sensor element, a CMOS chip, contains a heating resistor and two temperature sensors (thermopiles), which are arranged symmetrically upstream and downstream of the heater.

The differential voltage of the thermopiles is a measure of the mass flow rate passing this bypass channel; the calibration procedure ensuring assignment of the sensor signal to the total flow rate passing the device.

Burkert Fluid Control Systems

Burkert Fluid Control Systems has been manufacturing products and systems for over 60 years that can be used wherever fluid media and gases need to be measured, controlled and regulated.

Burkert Fluid Control Systems has been manufacturing products and systems for over 60 years that can be used wherever fluid media and gases need to be measured, controlled and regulated.Whether the application is filling, level, flow, pressure or temperature we have a solution and a uniquely comprehensive range of products to handle it, including solenoid, process and analytical valves, pneumatic actuation, sensors and controllers.

For Burkert it is not enough to simply offer individual products.Our aim is to provide complete system and application solutions that meet the specific needs of our customers.Tell us what you need and our engineers will find an appropriate solution using our vast experience and a wide range of services such as advice and engineering, installation, testing, and after-sales support.

Burkert’s global presence offers our customers an additional advantage.Products and systems are constantly developed and optimised according to international standards.Through this process synergy effects evolve which ensure technological leadership and competitive advantage

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