DesignFlex pressure switches aid improved DNA sampling process

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In an application where reliability and consistent operation are critical, a new DNA collection technology developed by M-Vac Systems uses pressure switches from the ultra-sensitive pressure, vacuum and differential switch manufacturer DesignFlex – represented exclusively in the UK by Variohm EuroSensor.

DesignFlex pressure switches aid improved DNA sampling processAs DNA data plays an increasingly important role in solving crime, forensic scientists have traditionally taken sample collections by using swabs. However, particularly when gathering micro-particles from rough, porous or smooth surfaces, this has not always been the best approach, due to the difficulty in obtaining samples. This situation has changed with the M-Vac Systems’ wet-vacuum collection technology, which has enabled forensic laboratories and crime scene investigators to collect more DNA material in a single machine process that delivers a sterile DNA-free solution to the sample surface which is simultaneously recovered. The collected solution is then concentrated and analysed in downstream processes to create a potential DNA profile.

The DesignFlex PSF103 pressure switch is used for the solution delivery of the M-Vac System whilst the PSF109 vacuum switch is used in the collection process. With controllable hysteresis and wide-range field adjustable set point, the high-current switches selected allow precision monitoring with fine and repeatable control for these important processes.

USA-based DesignFlex is part of the Word Magnetics Group. Its full range includes high-sensitivity pressure, vacuum and differential pressure switches that range from 0.25 to over 4000mbar. With a working life in excess of 10 million cycles, these snap-action switches are housed in tough moulded polycarbonate casings and have field-proven success across thousands of applications in industry, agriculture, aerospace, and defence.

For more information about DesignFlex pressure switches, please go to

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