Design News, April 2013

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Design Engineering Products Best of the Engineering Marketplace Compiled by Lauren Muskett, Assistant Managing Editor Transducers Zero Dead Volume Thru-Flow Sensor Technology Widely in high performance liquid chromatography and other analytical and processing applications. After a two-year R&D effort, DJ Instruments has announced that its proprietary Thru-Flow Pressure Transducer technology is scalable to substantially smaller line sizes. These transducers are used widely in HPLC (high performance liquid chromatography) and other ana- and may be installed anywhere in the piping system. The devices are resistant to shock and vibration and provide EMI protection. The new LV2 low volume thruflow model is available for pressure ranges from 5,000 up to 30,000 psig. Accuracy is within 0.25 percent of full scale. 6Al4V titanium is the standard material for the LV2, while a range of sensing material options is available depending on the application. DJ instruments Endevco piezoresistive pressure Transducers Supports the rigorous demands of small vehicle research and development. lytical and processing applications where accurate pressure sensing is critical. They have 100 percent swept ID surfaces that present no cavities or protrusions that would trap particulates and contamination or create turbulence that could result in process disturbances. The internal volume of DJ Instruments' LV2 low volume thru-flow sensor is approximately 1 microliter compared to the standard DF2 model with an interior volume of 13 microliters. DJ Instruments' thru-flow pressure sensors have a small footprint Meggitt's Endevco piezoresistive pressure transducers are used by manufacturers of ATVs, motorcycles, snowmobiles, light rapid transit (LRT), small bulldozers, high-speed railcar manufacturers, and their associated vehicle research and development and test laboratories, for high-reliability fuel consumption analysis (air-to-fuel ratio), airbag inflation and safety testing, vehicle transmission testing, anti-lock brake systems (ABS) testing, hydraulic systems monitoring, and high-speed train external pres- Design News | april 2013 | www.d esign n –56– sure variations, vital assessments for maintaining proper safety during tunnel entry. As an important part of engine performance and durability testing, motorcycle OEMs also run engine prototypes within test cell environments to effectively measure crankcase oil pressures during extended runs. Environments are characterized by highly space constrained conditions for sensor installation. In addition, engine gas exchange analysis is used to evaluate the process by which a motorcycle engine cylinder fills volume with a fuel mixture. The measurement of control engine inlet pressures can be an effective tool for avoiding engine knocking. Exhaust system gas pressure analysis further evaluates unwanted engine behavior. Endevco piezoresistive pressure transducer models feature a four-arm strain gage bridge, ion implanted into a silicon diaphragm, for a wideband frequency response. This unique sculptured diaphragm design produces twice the sensitivity of traditional flat diaphragms, resulting in improved resolution. Integral hybrid temperature compensation of these transducers further provides stable performance over a temperature range of -18C to +93C (0F to +200F), with custom ranges upon request. Units offer lightweight, rugged construction and small diameters, for installation within space constrained environments. They are offered in multiple

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