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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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Test and measurement accelerometers are generally characterized by smaller size than industrial units and typically use a 10-32 co-axial connector to connect to measurement equipment. While they are sometimes used in industrial environments for machinery vibration collection, they are usually used in laboratories and similar environments. Modal and structural testing are the typical applications for test and measurement sensors.
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Piezoelectric Embedded Accelerometers
Our board level Piezoelectric Accelerometers are designed to be embedded into our customer's vibration monitoring system. These sensors are used for both dynamic measurement and shock applications. They are offered in solder pads or solder pins configuration and feature very low power consumption, high frequency response and customized packages.
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- Hermetically Sealed, 20 Pin LCC or J-Lead
- Small Size 0.350"sq. x 0.10"
- Light Weight: 0.62 g (0.68g J-Lead)
- +5V Operation
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Accelerometer Calibrator (Adjustable)
Features:
Measures sensitivity of Piezoelectric, ICPE and Voltage
Accelerometer types
Displays UUT and reference accelerometer output
Adjustable Vibration Excitation Amplitude
Internal or External Sinusoidal Excitation
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High output together with minimal susceptibility to strain induced error
extends the measurement range of the A/21 down to the 10-5g, 10-1Hz region.
The A/21 application area thus includes low level, low frequency dynamic analysis as occurs in the civil and marine engineering fields.
The KONIC sensing element, all welded construction, and total absence of epoxies and soldered connections maximises sensitivity /mass ratio (3pC/gm), reliability, and operating temperature.
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Features :
- Wide dynamic range
- High sensitivity
- Compact construction to fit in tight spaces
- Wide frequency range
- Standardized sensitivity
- Hermetic design
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Ultra high output, multiple shear plate vibration transducer. Shear plate
construction provides near total isolation from mechanical inputs other than acceleration, thus safeguarding measurement integrity in applications where vibration is accompanied by high dynamic strain levels.
Generalising, these conditions are prevalent where modal frequencies are low, and are thus associated with vibration surveys of large structures.
Transducers exhibiting significant strain response may operate more akin to strain gauges at low frequency excitation and their use is thus to be discouraged ! System noise level of 10-3pC is equivalent to 1µg.
This should be realizable with bandwidth restricted to 1kHz.
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The Dytran triaxial accelerometer model 3063B is a 100mV/g accelerometer ideal for low level, low frequency vibration measurements. The rugged 3063B can measure frequencies down to 0.3 Hz and can resolve vibrations as low as .0005 g's RMS. This all stainless steel sensor has a rugged side MIL 4-pin connector, is hermetically sealed, and is case isolated. The 3063B accepts an Immersion Proof boot for all weather conditions.
Key Features
• Side MIL 4-pin robust connector
• 100mV/g sensitivity
• Excellent low frequency response
• Low noise electronics
• All stainless steel construction
• Hermetically sealed
• Through hole mount
Potential Applications
• Low level, low frequency vibration measurements of large rotating machinery, bridges, buildings, and other large civil structures
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The new 3023M23 is a miniature 10mV/g IEPE triaxial accelerometer that is capable of operating at temperatures up to 320°F. This triaxial accelerometer is unique in that the labels of the axes X, Y, and Z are laser marked in a large font size on the three orthogonal faces aiding the user in orienting the sensor.
Key Features
• High temperature operation
• Single 4-pin connector
• 10mV/g sensitivity
• 10-32 mounting hole
• All titanium construction
• Hermetically sealed
• Wide bandwidth
Potential Applications
• Modal Analysis
• NVH
• Environmental Stress Screening
• General Purpose Vibration
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High temperature, Radiation Hardened ceramic shear, charge output accelerometer, 10 pC/g, 5kHz, 10-32 side conn.(-65° to +900°F), supplied with 10 foot (3 meter) hardline cable.
Sensitivity: (±10%) 10 pC/g (1.02 pC/(m/s²))
Measurement Range: ±1000 g pk (±9810 m/s² pk)
Frequency Range: (+5%) 5000 Hz
Temperature Range: -65 to +900 °F (-54 to +482 °C)
Electrical Connector: 10-32 Coaxial Jack
Weight: 1.1 oz (30 gm)
For engines, environmental chambers, gas turbines and radioactive environments.
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Dytran Instruments Inc. has just introduced an ultra miniature IEPE accelerometer with titanium housing. Weighing in at just 0.2 grams, this miniature accelerometer successfully reduces mass loading effects. Because of its tiny "teardrop" design, the 3224A2 is ideal for vibration measurements in even the smallest locations.
Model 3224A2 is laser welded in a titanium housing which ensures its robust construction and contributes to its lightweight. The model 3224A2 is available with a sensitivity of 2mV/g and can operate at temperatures up to 300°F. It features integrated electronics, an adhesive mount and a planar shear, quartz design which reduces base strain sensitivity, thermal transient response and thermal coefficient of sensitivity.
Key Features
• Ultra miniature design
• 2mV/g sensitivity
• 0.2 grams
• Integral cable
• Adhesive mount
• High temperature
• IEPE
Potential Applications
• Environmental Stress Screening
• PC board vibration measurements
• Product response
• General purpose vibration where space is at a premium
• Mechanical shock
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This ultra small vibration transducer (0.25 gram!)provides
virtual transparency applied to lightweight
structures, allied to relative freedom from strain
induced error. The reliability and performance
criteria applied to our transducers generally,
welded electrical connections and case seal, are
fully implemented in the construction of the
A/28/E.
Signal outlet is via a
surface contact socket.
A 0.8mm dia. softline cable is available
specifically for the A/28/E.
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Micro-miniature triaxial vibration transducer comprising three shear plate. A/28/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.
In cases where this is deemed to be a problem, an orthogonal three axis measurement, allowing computation of absolute value and direction offers a solution.
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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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Sub-miniature, all welded, KONIC sensing element based vibration transducer. The low mass of the A/25/E renders it transparent in the vast majority of lightweight structure vibration measurement applications.
The A/25/E is adhesive mounted. A detachment tool is provided to shear adhesive joints. Shock removal is to be avoided as being deletorious to
the integrity of the transducer.
Abrasive cleaning of the attachment face will reduce base thickness over time, sparing use of adhesive will aid longevity. Signal outlet is via a surface contact socket. Mating connector preload torque should be 7cNm, the locknut tightened to 12cNm for signal integrity to 10,000g. Insufficient preload may result in intermittent signal loss.
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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 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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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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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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![miniature piezoelectric accelerometer with integrated electronics DJB INSTRUMENTS 10mV/g ----- ø=[8.7 ; 9.3] mm](http://img.directindustry.com/images_di/photo-pp/miniature-piezoelectric-accelerometer-with-integrated-electronics-189700.gif)
![piezoelectric accelerometer with integrated electronics DJB INSTRUMENTS 100mV/g ----- ø=[13.9 ; 15.6] mm](http://img.directindustry.com/images_di/photo-pp/piezoelectric-accelerometer-with-integrated-electronics-44003.gif)
