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A three variant range of low mass (2gm.)
accelerometers, each with KONIC sensing
element, welded construction, miniature (3.5mm
thd.) side or top entry coaxial connector, and
titanium case. The two adhesive mount versions
(A/124/E, A/124/TE), are provided with bonded
isolation discs to minimise ground loop
interference, whilst the top entry connector
version (A/124/TS) is also available with integral
mounting stud but without isolation.
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Include modal analysis of lightweight structures and shock measurement. Low frequency multi point modal measurements are subject to
individual phase/gain errors associated with the lower corner frequency of the QVC.
The ratiometric nature of modal analysis however reduces transfer function uncertainty to the associated lower corner frequency variations of individual QVCs.
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The Dytran Model 3023A is a miniature 10mV/g IEPE triaxial accelerometer that can be adhesive mounted to small test objects. The 3023A weighs only 3 grams and features a single 4-pin connector and all titanium construction. This sensor is hermetically sealed and is ideal for triaxial vibration measurements where space is at a premium.
Key Features
• Single 4-pin connector
• 10mV/g sensitivity
• Adhesive mount
• All titanium construction
• Hermetically sealed
• Wide bandwidth
Potential Applications
• Modal Analysis
• NVH
• Environmental Stress Screening
• General Purpose Vibration
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S ub-miniature triaxial vibration transducer comprising three KONIC A/25/E inserts bonded orthogonally into a hard anodised aluminium housing.
The inserts are electrically insulated, individually and from the housing, thus
eliminating ground loop interference. The additional mechanical isolation implicit in the construction provides also near elimination
of strain induced error.
The spatial response of a structure to dynamic forcing may lead to erroneous single axis vibration or shock measurement, due to the
inherent directional property of the transducer.
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A generic range of lightweight, KONIC sensing element based vibration transducers offering a choice of integral stud or flat base adhesive
attachment, and each with side or top mounted connector.
All welded construction maximises temperature range, reliability, and sensitivity is approximately double that of competitive equivalent mass
products. Spurious strain induced error, either via the structure or signal cable, is negligible.
Adhesive mounted versions : Abrasive cleaning of the attachment face will reduce base thickness over time, sparing use of adhesive will aid longevity.
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The Model 832M1 is a low cost, board mountable triaxial accelerometer. Featuring stable piezo-ceramic crystals, the accelerometer incorporates full power and signal conditioning with a maximum current consumption of 22 micro-amps. The model 832M1 is available in ±100g to ±500g ranges and provides a flat frequency response up to greater than 6kHz. The standard model 832 offers the same envelope with a lower maximum current consumption of 4 micro-amps.
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The new Dytran 3214A series single axis cubic accelerometer is an excellent instrument for modal analysis, NVH, Squeak & Rattle, and general purpose vibration applications. The 3214A series accelerometer has ultra low noise electronics, wide bandwidth, all titanium construction, and is available in sensitivities of 10mV/g, 100mV/g, and 500mV/g. This accelerometer features a 10-32 mounting hole and its cubic design allows for adhesive mounting on multiple mounting faces.
Key Features
• Unique cubic design
• Available in 10mV/g, 100mV/g, and 500mV/g
• 10-32 mounting hole
• All titanium construction
• Hermetically sealed
• Low noise electronics
• Wide bandwidth
Potential Applications
• Modal Analysis
• NVH
• Squeak & Rattle
• General Purpose Vibration
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General purpose KONIC vibration transducers c/w integral two wire charge/voltage converter (QVC). QVCs are energised from a current source, generate a low impedance, noise immune voltage proportional to input charge, hence acceleration, and need minimal interfacing.
QVC interface is available in several commercial vibration spectrum
analysers as well as in our own VV/04 or V4/04 signal conditioner, which provide in addition normalising, scaling, and fault detection features.
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Single Axis A640
Ranges ±1g to ±20g, ±5Vdc output
Features
- Ranges ±1g to ±20g
- Essentially zero temperature coefficent of
damping ratio
- Filtered and unfiltered outputs
simultaneously available
- Integral temperature compensation
- DC input - DC output
- High reliability
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Wilcoxon Research manufactures a variety of triaxial sensors which consist of three sensing elements within a single housing. These transducers allow for the acquisition of multi-directional data at a single mounting location. Proponents of multi-axial sensors cite the increase speed of data collection, its inherently consistent readings and reduction in wiring for permanent installations.
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Lightweight triaxial vibration transducer comprising three KONIC all welded inserts bonded orthogonally into a hard anodised aluminium housing.
The inserts are electrically insulated, individually and from the housing, thus
eliminating ground loop interference. The additional mechanical isolation implicit in the construction provides also near elimination
of strain induced error.
The spatial response of a structure to dynamic forcing may lead to erroneous single axis vibration or shock measurement due to the
inherent directional property of the transducer.
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Lightweight triaxial vibration transducer comprising three KONIC all welded inserts, each with hybrid QVC, bonded orthogonally into a hard anodised aluminium housing. The inserts are electrically insulated, individually
and from the housing, thus eliminating ground loop interference. Low impedance O/P provides a high degree of noise immunity (80dB
improvement vs. equiv. charge source device @ 50Hz) and allows use with low cost coaxialcable.
The additional mechanical isolation implicit in the construction provides also near elimination of strain induced error. All the 3x10/32 Microdot connectors are exiting in the same direction.
The spatial response of a structure to dynamic forcing, may lead to erroneous single axis vibration or shock measurement due to the
inherent directional property of the transducer.
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Highest sensitivity multiple shear plate vibration transducer, intended for micro g level measurement. Virtual immunity to strain input side effects provides guarantee of low frequency measurement integrity. System noise
level of 10-2pC is equivalent to 1mg. With bandwidth restricted to 2kHz, 1 octave below resonance, noise floor should be significantly below this.
Noise level vs. upper corner frequency for the CA/04/N charge amplifier, A/800 source and nominal l0Mtr. cable is shown in Fig.1. Bear in mind that charge amplifier noise increases as a function of input capacitance - noise
assessment should be made with the charge amplifier input correctly terminated.
The transducer adds mass at its point of attachment to a structure, thus imposes a transparency constraint above which data corruption will be excessive.
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Hardy Instruments offers a full line of industrial grade accelerometers for measuring vibration on typical plant machinery. These accelerometers are in stainless steel housings to withstand harsh environments. They are isolated from ground and are protected against RF noise by an inner shield.
Typically, Hardy accelerometers have 2-pin MS style connectors, which adds to their ruggedness, and can be supplied with watertight mating connectors and cables.
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- High performance series;servo-accelerometers with analogue or digital output.
- Low cost series, open loop capcitance
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- Sensor ICP
- Small size case 1/2" x 1.05"
- Integral cable (5, 10 ou 20 m)
- Waterproof
- LOW COST
Applications :
- Automotive testing
- Instrumentation
- Vibration measurement
- Speed measurement
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Vibra-Metrics takes a conditions-driven approach to accelerometer/vibration sensing product selection, providing a full range of accelerometers to suit almost any condition or application. Our accelerometers and vibration sensing products rank among the best in the industry. The company leads the industry in the development of exclusive features such as integral cable assemblies for lasting protection against chemicals, contaminants and other elements; IsoShield, Vibra-Metrics' electrical isolation feature, providing the highest level of EMI/RFI noise rejection; and other innovative functionality.
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Endevco® Model 2221F piezoelectric accelerometer is specially designed for reliable high temperature vibration measurement on small structures and objects. The unit is hermetically sealed and is ideal for use in extreme environments. Its lightweight (11 gm) design minimizes mass loading effects. The accelerometer is a self-generating device that requires no external power source for operation.
Model 2221F features Endevco’s Piezite® P-8 crystal element, operating in annular shear mode. This unit exhibits excellent output sensitivity and stability over time. Signal ground is connected to the outer case of the unit and, when used with an isolated mounting screw, the accelerometer is electrically isolated from ground. A low-noise coaxial cable is supplied for error-free operation. The transducer has a centrally located thru bolt, allowing for 360° cable orientation. The unit may also be adhesively mounted if the application permits.
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The extended temperature capability (+175 °C) and high resolution of Endevco's Model 65HT triaxial accelerometer separates its performance from that of its competitors.
Incorporating the latest in high temperature component and process technologies, Model 65HT's micro-electronic circuits are designed and built to continuously operate at +175°C, all packaged within a 10mm welded titanium cube. The relatively compact size of this accelerometer enables a test engineer or technician to simultaneously measure vibration across three orthogonal axes on lightweight structures.
Interface to the model 65HT is via a hermetically sealed 4-pin connector. It is supplied with high temperature cable assemblies as a standard accessory.
Model 65HT's excellent frequency responses, both amplitude and phase, make it ideally suited for structural and component testing in automotive test cells, environmental test chambers and general laboratory applications.
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Endevco® Model 7285 is a very low mass piezoresistive accelerometer, weighing less than 1 gram. This accelerometer is designed for measuring front, rear and side impacts in vehicle crush zone applications. This unit has been designed and assembled using decades of experience that Endevco has acquired successfully building sensors for the crash industry. As a result, the reliability of Model 7285 ensures that critical data is recorded upon demand at very low cost.
Model 7285 utilizes a micro-machined sensor which includes integral mechanical stops. This monolithic sensor design offers ruggedness, stability and reliability. Model 7285 has minimum damping, thereby producing no phase shift over the useful frequency range. With a frequency response extending down to DC (steady state acceleration) this accelerometer is ideal for measuring long duration transient shocks.
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Endevco® Model 7264D is a very low mass piezoresistive accelerometer weighing only 1 gram. This accelerometer is designed for crash testing, flutter testing, rough road testing and similar applications that require minimal mass loading and broad frequency response. This accelerometer meets SAEJ211 specifications for impact testing and the SAEJ2570 specification for anthromorphic testing. It is a direct replacement for Endevco Model 7264-2000 and 7264C, in that the location of the center of seismic mass is the same.
Model 7264D utilizes an advanced micromachined sensor which includes integral mechanical stops. This model has a high resonant frequency (>40 000 Hz) and frequency response, which captures more data and avoids spurious noise. The Model 7264D has minimum damping, thereby producing no phase shift over the useful frequency range. With a frequency response extending down to DC (steady state acceleration) this accelerometer is ideal for measuring long duration transient shocks.
This accelerometer has a full bridge circuit with fixed resistors for shunt calibration. Full scale output is 400 mV with 10Vdc excitation. Each unit performs with < 1% transverse sensitivity and ZMO of < ± 25 mV.
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Endevco® Model 87 is an ultra low-noise piezoelectric (IEPE-type) accelerometer with integral electronics, designed specifically for measuring ultra-low level, seismic events and low-frequency vibration on structures and objects. The unit is hermetically sealed, and offers a 1 V/g or 10 V/g sensitivity, low signal-to-noise ratio, and near-DC frequency response.
Model 87 incorporates an advanced ultra-low noise hybrid circuit, which operates in constant current mode. A simple two-wire system transmits its low-impedance voltage output and the required power. Signal ground is isolated from the outer case and mounting surface to prevent ground loops. A specially designed cable assembly is available as an optional accessory.
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Endevco® Model 7290A Microtron® accelerometer family utilizes unique variable capacitance microsensors. Accelerometers are designed for measurement of relatively low level acceleration in aerospace and automotive environments. Typical applications require measurement of whole body motion immediately after the accelerometer is subjected to a shock motion, and in the presence of severe vibrational inputs.
Gas damping and internal overrange stops enable the anisotropically-etched silicon microsensors to withstand high shock and acceleration loads.
Model 7290A can operate from 9.5 V to 18.0 V and provide a high level, low impedance output. The ±2 volt differential output is dc coupled at a dc bias of approximately 3.6 V. Frequency response is controlled by the near-critically damped sensors. The use of gas damping results in very small thermally-induced changes of frequency response.
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Endevco® Model 2222C is the industry's best selling minature piezoelectric accelerometer, for vibration measurement on small electronics, consumer products, and mini or delicate structures. Its very low weight (0.5 gm without cable) effectively minimizes mass loading effects to the test structure. accelerometer is a self-generating device that requires no external power source for operation.
Model 2222C features Endevco’s Piezite® Type P-8 crystal element, operating in the radial shear mode. This sensor exhibits excellent output sensitivity stability over time. Signal ground is isolated from the mounting surface of the unit by a hard anodized surface. A specially designed low noise coaxial cable is supplied for error-free operation. Unit and cable removal tools are included in the package to ensure proper removal in the field.
Endevco signal conditioner Models 133, 2775B, or Oasis 2000 computer-controlled
system are recommended for use with this high impedance accelerometer.
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The Model 6061 and 6062 Piezoelectric Accelerometers are ideal for vibration work with the advantage of small size and lightweight to minimize mass loading effects. They are designed for the measurement of wideband, moderate to high-level shock and vibration. The units incorporate an inverted shear crystal-mass assembly within a stainless steel body to provide a reliable sensor that is insensitive to environmental inputs such as base bending and thermal transients. Signal ground is connected to the outer case of the unit.
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Endevco Model 12M1A PICOCHIP™ is a high performance piezoelectric accelerometer packaged as a surface mount chip component. The unit is engineered for integration in standard hybrid or SMT electronics packages, along with custom designed signal conditioning circuits, allowing the user to create miniaturized shock and vibration measurement systems in one completely integrated package.
Model 12M1A features Endevco’s PIEZITE Type P-8 bimorph sensing element, operating in bender mode, which provides low base strain sensitivity, low pyroelectric output, and extremely high charge output versus size. Contact with the sensing element is made through two thick film gold metalized mounting pads on the bottom surface of the aluminum case. The unit is designed to be mounted with conductive adhesives or solder.
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The Columbia Models SA-102MFTB and SA-302MFTA are precision miniature force balance accelerometers designed to operate from +24 to +32 VDC aircraft power. The high level output signal and inherent self-regulation qualities of the servo loop design make these accelerometers excellent candidates for airborne telemetry applications. The output signal format is compatible with most airborne VCO’s and signal processing systems.
Both configurations incorporate the Columbia HP torquer system, which provides exceptional performance and reliability in the severe vibration and shock environments associated with aircraft and missile flights.
- EXCITATION: +24 To +32VDC
- RANGES AVAILABLE: ±1Thru ±35g
- Details: Miniature - Airborne
- OVERALL ACCURACY: ±0.2%
- OUTPUT: 0.2 To 4.8V
- TEMPERATURE RANGE: -50°C To +90°C
- VIB LIMIT: 10g
- DAMPING: Electrical
- WEIGHT: 14OZ
- ELECTRICAL CONNECTION: Solder Pins
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The D.Electron 3-axial acceleromter has been designed to be the transducer of a motion control system capable of eliminating unwanted floxures and oscillations of a machine tool.
While the standard position transducer cannot measure the real tool-tip position, it could be the nearer transducer to the tip of the tool.
Novelty of the D.Electron 3-axial accelrometer is the possibility of being connected to any motion control system (not only D.Electron Z32 CNC): its output is coded as a standard encoder output.
The accelerometer has been designed for real-time applications, with extremely fast A/D conversion and maximum output delay below 1 mcro-second.
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The basis for the QG sensors is a micro machined capacitive sensing element in silicium (MEMS). Despite the high accuracy this element has a very high shock resistance; a sensor with a 1G full scale sensitivity can withstand shocks up 20.000G ! The capacitance levels are transformed with an integrated amplifier to analogue voltage levels. A range of I/O configurations are possible with the modular setup of complementary circuits inside the sensor. All QG sensors benefit from the robust QUADRO® (PDF) housing.
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Low Speeds, High Temperatures and Most Everything in Between
With a large selection of case-mounted sensors to choose from, we can provide condition monitoring sensor systems for more applications and machine types than ever before.
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