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Sensor news & technical articles
in week 32/2007:

 

Inclination Sensor - without measuring disturbance due to vibrations?
 

Each current inclination sensor on the market will be disturbed more or less by vibrations in the measuring direction. Additional electronic filters and/or complex algorithms will not solve the problem if the measuring element is already clipping or due to strong damping reacts too slow. This result in some cases to extreme tolerances, which cannot be recognized by the user. The SCHMIDT® Inclination sensor NW 40.100 has been under consideration of the problem – measuring disturbance caused by vibrations – optimized and measures inclination angles of movable systems relative to the horizontal plane directly. No additional filtering or software is needed. Main features of the sensor are: Angle-linear analogue, binary or digital interface. Fluidically damped gravitational pendulum. Contact less measuring by rotary field method without external rotary magnet or shaft attachment. Angle measuring range up to 360° optionally selectable with an angle resolution of 2.5 x 10-4 of the total measuring span. High angle fidelity at angular rates up to 180°/s. Extreme insensitive at vibrations due to low-tuned resonance frequency of 3 Hz. No signal clipping at high acceleration levels. ...






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Kistler Offers Right Mold Cavity Pressure Sensor for any Process
 
Complete portfolio of cavity pressure sensors: Cavity pressure is and remains the process variable in evaluating the injection molding process and the quality of the molding. The right choice of sensor and simple and reliable connection technology are the most important criteria for success. The size of the sensor is often determined by the size of the molding. Kistler offers the right sensor for any dimensions – with front diameters from 1 mm (Type 6183A…) to 6 mm (Type 6152A…), or miniature sensors with side cable outlet Type 6184A…. There are, however, other factors that dictate the choice of sensor. For example, fillers and abrasive materials require sensors with a front coating, which Kistler offers for all standard sensors in the form of abrasion-resistant chromium. Last not least, the process determines which is the right sensor to choose. In low-pressure processes, such as foam of thermoplastics or polyurethane injection molding, particularly sensitive high-resolution sensors must be employed. Kistler’s special low-pressure-processing sensors Types 6172A…, 6177A… and 6178A… have proven effective in these applications. In addition to cavity pressure, the combined pressure and temperature sensors ...





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PCB Introduces New Free Field ICP® Array Microphone for NVH Studies, Sound Pressure Mapping, Acoustic Holography and Biomedical Research
 
Depew, NY, USA – PCB Piezotronics (PCB®) has debuted Model 130D22, a combined ICP® free field response pre-polarized array microphone and preamplifier. The microphone is designed for measuring sound pressure levels and frequencies in the audible range, and can be used simultaneously with ICP® accelerometers to simplify test setups. Model 130D22 also incorporates a SMB connector, which is easy to assemble, provides seamless transition for many data acquisition systems and software set-ups, and saves time when connecting multiple units, such as in a large channel array setup. When used with data acquisition systems that have 2-20 mA constant current supply, the system does not require additional power supplies. The unit has high sensitivity (45 mV/Pa), uses standard low-cost coaxial cables, and also has optional TEDS capability, which allows for ease of use, and traceability. This acoustic test product is ideal for array set-ups (2 D Pressure Mapping, Holography); trending and frequency analysis; predictive maintenance on machinery fans, bearings and other industrial applications; white goods testing; NVH studies for automotive and ...





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PCB Piezotronics Offers Pressure Transducers and Transmitters for General Purpose and Hazardous Industrial Environments
 
Depew, NY, USA - Series 1500 Transducers and Transmitters from PCB Piezotronics (PCB®) offer a complete selection for pressure monitoring in general purpose and hazardous industrial environments. General purpose units feature a rugged, all-welded stainless steel construction. The design includes elimination of mechanical fasteners, washers, o-rings, and fluid fills, greatly enhancing reliability and long-term repeatability of the units, and making them suitable for a variety of laboratory, factory, field, or submersible environments. Full scale ranges are available, from full vacuum to 6000 psi (400 bar), with accuracies of 0.5%, 0.25%, and 0.1%. Units are supplied with 0-5 VDC; 0-10 VDC; or loop-powered 4-20 mA output signals, with choice of pressure port and electrical connectors. Intrinsically safe Series 1500 units feature a thin, one-piece stainless steel Monolith pressure fitting, port and diaphragm design with ½” NPT thread, with optional Inconel® for H2S & sour gas media compatibility. Sensors are constructed without adhesives, welds, or fluid fillings, and have been certified under ATEX and CSA as intrinsically safe for use in hazardous environments. Transmitters offering intrinsically safe certifications ...





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Type 4005A... – Absolute Pressure Measurement
 
Kistler: The M5-size piezoresistive pressure sensor Type 4005A... is designed for measuring absolute pressure in engines. A so-called DCE sensor (DCE = Direct Chip Exposure), it does not have a steel diaphragm for separating media, but is exposed directly to the medium. The piezoresistive silicon measuring element is placed behind a protective shield and provided with a protective coating. Thanks to a special coating the sensor is able to withstand typical fuel and lubricating oil vapours. A good deal of flexibility in mounting is achieved thanks to the sensor’s compact design, so that it can always be located in the optimum position for measurements in the intake system. In addition to small dimensions, this design achieves superb linearity, low hysteresis and a high natural frequency. Used in conjunction with the piezoresistive amplifier module, the SCP signal conditioning system and PiezoSmart® automatic sensor identification, the new Type 4005A... constitutes a powerful measuring system which is very easy to operate. ...





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Sensor News in week 31 '2007     <<     >>     Sensor News in week 33 '2007


 

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