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DP Seals supplies vital part for police breathalyser units

28 July 2014

The high precision custom seals specialist, DP Seals has begun supplying a manufacturer of specialised breath alcohol analysis equipment with a custom designed bellows seal, forming an integral part of UK police breathalyser units.

Wales-based Lion Laboratories are now using the seal in their range of breathalyser units, which capture samples for accurate breath alcohol analysis.

The DP Seals barrel-shaped bellows, which weighs 0.12 grams and measures 9 x 7.5mm, will hold the air supplied before moving it in the right direction of the sensor. The part is made from silicone rubber and, given the importance of securing a precise sample, the flex and hardness of the seal is extremely accurate.

Lion Laboratories reason for choosing DP Seals was to gain more consistency with the product. After initial meetings between the two companies, DP Seals reviewed the design specification and created new moulding tools and refined the material composition, the new bellows seal was then tested amongst sample assemblies at Lion Laboratories Glamorgan-based branch before going into production.

The bellows itself, of which Lion Laboratories used 17,500 pieces in 2013, doesn’t come in contact with the alcohol breath sample. Instead, it fires the sample in and causes the suction motion. A breath is blown through a tube attached to a fuel cell, then an outlet which runs through to a pressure transfuser.

The bellows then opens and closes after drawing the air through the tube and the breath sample is captured and analysed.

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