PRODUCTS SENSORS & SENSING SYSTEMS
COMPACT ROTARY POSITION SENSORS
INDUCTIVE AND POSITION SENSORS FOR OEM APPLICATIONS
Micro-Epsilon UK has extended its range of inductive displacement and position sensors for medium to high volume OEM applications. According to the company, the sensor geometry, mounting and electronics can be custom-engineered to suit specific OEM, R&D or machine build applications. The company’s induSENSOR family of inductive sensors includes six core product ranges, which are based
on the inductive measuring principle, the LVDT principle, or patented variants of these measuring methods. Conventional 3-coil LVDT sensors: The DTA series of LVDT displacement sensors and LVDT gauges have a primary and two secondary coils, which are arranged symmetrically to the primary winding. As a measurement object, a rod-shaped magnetic core can be moved within the differential transformer; and movement of the core within the magnetic field of the coil causes a higher voltage in one secondary coil and a lower voltage in the second coil. The difference between the two secondary voltages is proportional to the core displacement. The LVDT series has an output signal that is very stable. Gauge LVDT’s with 8mm body diameter and many custom options: The LDR series of inductive sensors are constructed as half-bridge systems, enabling a compact design with smaller diameters. Advantages include higher operating temperatures and a shock rating of up to 300g (axial) or 100g (radial). Inductive-potentiometric sensors LVP and VIP series: These displacement sensors are patented single
coil inductive sensors, providing improved measurement range to body length ratio. In addition, the standard sensors have an 8mm body diameter. The LVP uses an inner core as the sensor rod; while the VIP uses an outer ring as the target, offering an even more compact footprint. Long stroke sensors for hydraulic applications: The robust EDS series is designed for hydraulic cylinder
positioning or for high shock and vibration applications on mobile hydraulic systems such as off-highway vehicles. Pressure rating is 450 bar (higher on request) and shock rating (axial) is 300g. The electronics are compact and are housed in the mounting flange of the sensor. The latest version, the EDS miniature series, has a diameter of just 3mm, which is ideal for miniature
hydraulic cylinders and actuators. The sensors are manufactured from a pressure-resistant stainless steel (up to 450bar), can operate to 175˚C and withstand extreme vibration and shock levels (up to 300g axial and 100g radial). The sensor electronics and signal conditioning are also extremely compact.
Micro-Epsilon T: 0151 355 6070
www.micro-epsilon.co.uk Enter 211 NON-CONTACT LVDT SENSORS SUIT A RANGE OF APPLICATIONS
Designed for contactless and wear-free path and position detection, INELTA’s LVDT sensors, available from Hoffmann + Krippner, are suitable for use in applications ranging from medical technology to industrial, seafaring, machinery construction and special purpose machines. With their chemically nickel-plated steel housing
with IP65 protection (optional IP68), these are suitable for use in temperatures from -25 to +85˚C (although these can be extended if needed). Easy to
install, they are available as M12 or M18 versions with external thread and capture measuring lengths of up to 2, 5, 10 or 20mm, depending on the model. The linearity tolerance is ± 0.5%. Custom sensor designs with other configuration
options, such as improved linearity tolerance or individual calibrations, are also available.
Hoffmann + Krippner
www.hoffmann-krippner.com Enter 213 SMALL AND RUGGED PIEZORESISTIVE SENSOR LAUNCHED
Designed for use in harsh applications, Measurement Specialties’ rugged 85BC media
compatible, piezoresistive silicon pressure sensor, is designed without a header for applications where compatibility with corrosive liquid and gas is required. This 13mm sensor is housed in a 316L stainless steel package. A six-pad ceramic substrate, containing laser-trimmed resistors that provide wide temperature compensation and offset correction, is attached to the sensor’s package. An additional laser trimmed gain set resistor can be used to adjust an external differential amplifier and provide span interchangeability
18 MAY 2015 | DESIGN SOLUTIONS
to within ±1% of the 75 mV to 150 mV span. The sensor also features a non-linearity of
±0.3% across its standard pressure ranges from 0-15 psi to 0-300 psi; a wide compensated temperature range from -20°C to +85°C; and has a typical zero pressure output of 100 mV. It has an operating temperature range of -40°C to +125°C and comes in absolute and gauge formats.
Measurement Specialities
www.meas-spec.com Enter 214
/ DESIGNSOLUTIONS
Despite being just 4.0 x 4.5 x 2.0mm, Murata’s SVM4 series exhibits a linearity of ±2% and suits a wide variety of space-constrained applications. These include finger-joint controllers in humanoid robots or to provide angular control in very compact spaces, such as in radio-controlled model and game console controllers. In addition, effective rotational
angle is 240˚ and the sensors have a useable temperature range from -40 to +85˚C, enabling their use in most operating environments. Other potential applications are
said to include use in wearable devices such as headsets and hearing aids or as a lens/iris feedback sensor in compact digital cameras.
Murata
www.murata.com
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