100pC/g (±5%) • 46gm • 250°C Max. Temp.

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The A/29 is a robust annd highly sensitive lightweight accelerometer which is able to withstand high temperatures in excess of 250°C. This makes the A/29 is an ideal candidate for any application requiring high sensitivity measurements with very little margin for error.

Close tolerance 100pC/g normalized output accelerometers with ultra low strain induced error. Piezo-electric materials convert mechanical loading, however induced, to electrical charge.  
The A/29 is specifically configured to minimize the effect of physical inputs other than acceleration, thus enhancing measurement integrity in situations where flexural strain of the transducer could give rise to significant errors. Accelerometers based around piezoelectric discs operating in d33 compression mode are particularly prone to this phenomenon, and typically have strain sensitivity 40dB greater than that of a strain A/29. High sensitivity Konic shear sensing element produces 100pC/g output from 46gm wt, transducer. Totally welded construction maximizes reliability.

Charge Amplifiers

Charge Output Accelerometers require a Charge Amplifier to convert the charges from the vibration sensor to a voltage, readable by front end instrumentation or vibration analysers.

The CA/04/N variant of the CA/04 Series of Charge Amplifiers is best suited for use with the A/29. The CA/100 Miniature Charge Amplifier may be suitable for some applications.

Calibration

All DJB Accelerometers are calibrated on site prior to despatch, and are accompanied by a calibration chart with temperature and frequency responses listed. Periodic calibration can be carried out with our VC-01 Handheld Calibrator whilst we also offer a full calibration service including cross axis checks to aid accuracy of data. We are able to provide this service for all makes of accelerometer with a full report given for each device. Please contact us with an enquiry 

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360pC/g nom. • 95gm • 250°C Max. Temp.

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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.

Charge Amplifiers

Charge Output Accelerometers require a Charge Amplifier to convert the charges from the vibration sensor to a voltage, readable by front end instrumentation or vibration analysers.

The CA/04/NH variant of the CA/04 Series of Charge Amplifiers is best suited for use with the A/21. The CA/100 Miniature Charge Amplifier may be suitable for some applications.

Calibration

All DJB Accelerometers are calibrated on site prior to despatch, and are accompanied by a calibration chart with temperature and frequency responses listed. Periodic calibration can be carried out with our VC-01 Handheld Calibrator whilst we also offer a full calibration service including cross axis checks to aid accuracy of data. We are able to provide this service for all makes of accelerometer with a full report given for each device. Please contact us with an enquiry 

Cable Assembly and Repair Service

• Cable Repair Service to make current cabling as good as new, cutting costs whilst good for the environment
• Specialist Cable Assembly - for all manufacturers
• Cable and connector stock held for a quick turnaround

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1.2nC/g nom. • 115gm • 250°C Max. Temp.

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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 safe guarding measurement integrity in applications where vibration is accompanied by high dynamic strain levels. Generalizing, 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 to be discouraged.  A number of parallel shear plates equivalent in total thickness to single plate of charge sensitivity Q and capacitance C, generates charge nQ. Clearly taken to the limit, noise degradation overrides signal increase, hence these products are largely a compromise between signal/noise and mass/size.

This Accelerometer is also available as an IEPE version - A1600.

Charge Amplifiers

Charge Output Accelerometers require a Charge Amplifier to convert the charges from the vibration sensor to a voltage, readable by front end instrumentation or vibration analysers.

The CA/04/EH variant of the CA/04 Series of Charge Amplifiers is best suited for use with the A/600. The CA/100 Miniature Charge Amplifier may be suitable for some applications.

Calibration

All DJB Accelerometers are calibrated on site prior to despatch, and are accompanied by a calibration chart with temperature and frequency responses listed. Periodic calibration can be carried out with our VC-01 Handheld Calibrator whilst we also offer a full calibration service including cross axis checks to aid accuracy of data. We are able to provide this service for all makes of accelerometer with a full report given for each device. Please contact us with an enquiry 

Cable Assembly and Repair Service

• Cable Repair Service to make current cabling as good as new, cutting costs whilst good for the environment
• Specialist Cable Assembly - for all manufacturers
• Cable and connector stock held for a quick turnaround

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9nC/g nom. • 400/407gm • 250°C Max. Temp.

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Highest sensitivity multiple shear plate vibration transducers intended for micro g level measurement – virtual immunity to strain input side effects provides guarantee of low frequency, measurement integrity. System nose level of 10-2pC is equivalent to 1mg. With bandwidth restricted to 1 kHz, noise floor should be significantly below this. 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. The single degree of freedom example
where MT represents the transducer mass, reduces  by 3% for a transducer adding 10% to the structure mass. Application area of the A/800 is thus limited in scope to low level vibration surveys in the civil engineering and heavy engineering domain

This Accelerometer is also available as an IEPE version - A/1800.

Features

• Robust Design
• Shear Plate design
• High Operating Temperature of up to 250°C Standard
• Ultra High Sensitivity - 9 nC/g output

Options

• Hermetic TNC connector version: ref. A/800/TC
• Wideband temperature calibration -50/+250°C

Charge Amplifiers

Charge Output Accelerometers require a Charge Amplifier to convert the charges from the vibration sensor to a voltage, readable by front end instrumentation or vibration analysers.

The CA/04/EH variant of the CA/04 Series of Charge Amplifiers is best suited for use with the A/800. The CA/100 Miniature Charge Amplifier may be suitable for some applications.

Calibration

All DJB Accelerometers are calibrated on site prior to despatch, and are accompanied by a calibration chart with temperature and frequency responses listed. Periodic calibration can be carried out with our VC-01 Handheld Calibrator whilst we also offer a full calibration service including cross axis checks to aid accuracy of data. We are able to provide this service for all makes of accelerometer with a full report given for each device. Please contact us with an enquiry 

Cable Assembly and Repair Service

• Cable Repair Service to make current cabling as good as new, cutting costs whilst good for the environment
• Specialist Cable Assembly - for all manufacturers
• Cable and connector stock held for a quick turnaround

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100mV/g up to 3V/g (±10%) • 90gm • 185°C Max. (HT version)

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 High output Konic shear IEPE vibration transducer utilizing DJB’s unique and technically superior Konic shear design of piezoelectric ceramic sensor. Available with a sensitivity up to 3V/g which offers a measurement range of 1.6g the A/121 can be used to measure low level building vibration as well as other applications where minimal vibration is present. 
Using a wide range of IEPE signal conditioning levels the A/121 range can interface directly to a wide range of commercially available vibration spectrum analyzers and data acquisition systems as well as in our own VV/04, V3/04, V4/04 and CV9 signal conditioners which offer a range of normalizing and amplification options. 
Version A/121/VI incorporates a three pole band pass filter for noise rejection with a case isolated signal outlet for common mode interference rejection.

Calibration

All DJB Accelerometers are calibrated on site prior to despatch, and are accompanied by a calibration chart with temperature and frequency responses listed. Periodic calibration can be carried out with our VC-01 Handheld Calibrator whilst we also offer a full calibration service including cross axis checks to aid accuracy of data. We are able to provide this service for all makes of accelerometer with a full report given for each device. Please contact us with an enquiry 

Cable Assembly and Repair Service

• Cable Repair Service to make current cabling as good as new, cutting costs whilst good for the environment
• Specialist Cable Assembly - for all manufacturers
• Cable and connector stock held for a quick turnaround

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Low Noise Charge Amplifier • Extended Low Frequency Response • Bandwidth 0.1/100kHz

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The CA/04 extended low frequency response charge amplifier forms an integral part of the 04 System, and can be interfaced directly with digital displays and vibration analysers. For applications requiring permanent instrumentation, a DIN Rail Mounted version is available (CV1-C).

Calibration

All Instrumentation is calibrated prior to despatch. Subsequent calibration can be carried out on the CA/04 via the calibration terminal.

Features

• Peak load indicator
• Calibration Terminal allowing for periodic Calibration
• Adjustable output up to 3.16V/g

Options

• CA/04/NL (0.1/11pC/g)
• CA/04/NH (10/1100 pC/g)
• CA/04/EH (100/11000pC/g)
• Are available for low, high or very high sensitivity accelerometer

Differential 2 Pole, Piezo-Transducer Interface • Input Range 1/100pC/g (x10 for /H) Normalised O/P up to 10V/pC • Bandwidth 2Hz/30kHz

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The CA/04/D comprises two identical charge amplifiers housed within one unit, this type of charge amplifier is designed for use with 2 pole industrial accelerometers. The twin inputs are translated into one output, with the removal of noise. This type of charge amplifier is particularly suited to applications where a long cable length is required.

Features

• Calibration terminal for periodic calibration.
• x1/x10 multiplier providing output normalising of 1/110pC/g (CA/04/D), or 10/1100pC/g (CA/04/DH).

Applications

• Industrial Applications requiring long cable lengths, e.g. Power Stations.

Transducer Interface Converts Acceleration to Velocity • Input Range 1/100pC/g O/Ps 100mV/g & 1V/mm.sec. (max)

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The CA/04/V is a 1/100pC/g normalising charge amplifier with noise limiting 10Hz 4 pole high pass filter and single integrator. Integrator converts periodic acceleration above the filter corner frequency to velocity. Integrator gain can be controlled controlled over 50dB dynamic range by 6 position switch.

The Charge Amplifier Provides wideband 100mV/g acceleration proportional output when normalised, transducer sensitivity range 1/100pC/g, by means of ten-turn dial and x1, x10 multiplier.

Features

• Noise limiting high pass filter.
• Internal Integrator Converting Acceleration to Velocity.
• Variable output with x1 and x10 multiplier control.

Voltage Source Amplifier for IEPE Accelerometers • Input Range 1/110mV/g • Normalised O/P 31.6V/g max.

 For Technical Data and Schematics

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IEPE Accelerometers feature an integrated QVC, converting the charges output from the piezoelectric sensor to a voltage, driving a low impedance voltagel superimposed on the supply line. Where the signal levels are adequate then minimal instrumentation is required to interface with the Accelerometer.

The VV/04 Voltage Source Amplifier includes the QVC constant current power supply required by IEPE Accelerometers, and open/short circuit indicatiors. The Instrument also features normalising and range amplifiers.

A coaxial lead is sufficient for connecting the accelerometer with the VV/04.

IEPE Accelerometers are immune to supply voltage noise but have limited line drive capability as connecting lead capacitance presents a reactive load. Where signal level is adequate, the minimal interface shown inthe datasheet of the indivial accelerometer  will suffice. However, the VV/04 adds gain, calibration and monitoring enhancements to the measurement system, improving dynamic range and ease of use.

The normalising section provides an output of 100mV/g (O/P1) for transducer/QVC sensitivities within the range 1/110mV/g by means of a three decade digi-switch and x1/x10 multiplier switch directly set to transducer sensitivity.

In addition the range amplifier provides outputs of 1V/0.0316, 0.1, 0.316, 1, 3.16 or 10g (O/P2), selectable by 6 position switch.

For transducer sensitivities outside the direct dialled normalising range, or to shift the dynamic range, a normalising scaling factor can be used.

Features

• Integrated PSU for driving Accelerometers.
• Fault and overload detection.
• Adjustable gain over the range x1 to x100 in 10db increments.

Analogue Integrator Converting Vibration Data from Acceleration to Velocity Format

For more technical information:

View Datasheet

The VM/04 is an analogue acceleration to velocity converter, with an in built high pass filter removing noise from the signal that could affect the integrity of test data. The signal output by the VM/04 can be read as mm/sec/V. For configurations using Charge Output Accelerometers a Charge Amplifier will be required.

Standard Scaling

The VM/04 features adjustable scaling, with high pass filter frequencies of 5 or 20Hz, and velocity ranges 1, 3.16, 10, 31.6, 100, 316mm/sec.pk. /volt pk. for 10mV pk./g input.

Options

• Adjustable high pass corner frequencies
• Velocity range scaling on input signal level.

Double Integrator/High Pass Filter Converts Vibration Data From Acceleration to Displacement Format

For more technical information:

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Low frequency vibration data is often required presented in displacement format, which more clearly relates to parameters such as dynamic strain and movement.

A Charge Amplifier will be required when using Charge Output Accelerometers.

Two switched high pass filter corner frequencies are provided, together with six switched, 10dB increment displacement scalings

Standard Scaling

Switchable high pass filter frequencies of 5 & 20Hz, displacement range 0.0316, 0.1, 0.316, 1, 3.16, 10mm pk. pk./volt pk. for 10mV pk./g input.

Fixed frequency bandpass filters 1Hz/15kHz tuning range

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Customised fixed frequency bandpass filters, finding application in vibration and noise measurement where specific components of a wideband signal spectrum are required.

Applications include monitoring and quality test procedures relating to fixed speed rotating machinery, enhancing fault diagnosis, or generalising, bandwidth constraint to improve signal/noise or highlight spectral components. Inputs derived from rotating plant may vary in frequency due to load factors,.

Variants

BP/04/N provides narrow band frequency filtering between 1 Hz - 15 kHz.

BP/04/Wprovides wide band frequency filtering between 1 Hz and 15 kHz.

1V/g up to 10V/g (±10%) • 112gm • 185°C Max. (HT version)

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The A/1600 range of accelerometers are ultra high output, multiple shear plate voltage accelerometers. The use of shear plate construction provides near total isolation from mechanical inputs other than acceleration, thus safe guarding 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.

Ideal for use in civil/heavy engineering or Seismic applications the A/1600 provide high output along with low frequency measurement capability with high measurement integrity.

As with all IEPE accelerometers the A/1600 requires a constant current supply in the range of 2 to 20mA, this can be provided by the associated measurement front end (if available) or by the range of voltage source modules in the DJB Instruments range of instrumentation.

For applications requiring high temperature usage as well as high outputs, a Charge Output version of this accelerometer is available (A/600).

Available with a range of sensitivities to suit the end user application.

• Sensitivity - 1 or 5V/g (±10%) (other sensitivities are available)
• Resonant frequency ≥ 8kHz
• Frequency range 0.5 to 3kHz
• Temperature range -   -50°C to +125°C (+185°C HT version)
• Stainless Steel
• Supply Voltage - 15/35V
• Supply current -  2 - 20mA
• Bias voltage (20°C)  - 9/10V
• Mounting - base tapped 10/32UNF x 4mm deep
• Mass 115gm
• Microdot connector, 10/32 UNF thread (T)
• TNC connector (TC)
• Welded Construction

10V/g  (±10%) • 400/407gm • 185°C Max. Temp. (HT version)

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 The A/1800 range of IEPE Seismic accelerometers are specifically developed to provide high voltage output, using multiple shear plates for micro g level measurement. Virtual immunity to strain input side effects provides guarantee of low frequency and measurement integrity.  As with all IEPE types of accelerometer the A/1800 requires a constant current supply in the range of 2 to 20mA, this can be supplied by suitably equipped hardware front ends or via the voltage source modules available from DJB Instruments range of Instrumentation.

Ideally suited to Seismic and Civil engineering applications where low frequency and low 'g' level measurements are required.

For applications over 185ºC, a charge output version of this accelerometer (A/800) can deliver solutions up to 250ºC.

Features

• Ultra high output from multiple shear plates.
• Available with a Microdot or TNC Connector.
• High Temperature operation up to 185°C

DIN Rail Mounted Charge & Voltage Amplifiers/Filters

The CV1 DIN rail mounted range of Charge/Voltage/Filter nodules are available in a range of configurations to suit a variety of industrial and other applications where DIN rail mounting and screw connections are the preferred method of installation.

Providing all or a combination of Charge amplification, IEPE 4mA constant current supply and Fixed or Variable frequency filtering.

The modules utilise standard DIN rail mounts for fast fitting and set up, ideal for use alongside industrial cabinets or other wiring installations.

Features

• Power on indicators.
• Low pass / Highpass Filters available.
• 9 – 30 V DC power input – ideal for +24 V DC output, compatible with all DJB Accelerometers and those of other manufacturers.
• DIN Rail Mounting for applications requring permanently mounted instrumentation.

Modules available:

Frequency Options:

• Fixed frequency version must be specified when purchased, available from 0.2Hz to 250kHz
• Variable frequency version - 255 filter steps, set by DIP switch, range covering 0.2 Hz to 127 500 Hz
• Both versions are available with a variety of filter types including, Butterworth, Bessell, Anti-aliasing or General Purpose with 24/48 dB/Octave cut off.

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The LHP Filter is a modular switchable high or low pass filter unit available as a one or two channel DC powered unit or up to 8 channels in a AC/DC powered chassis. The units both use simple BNC input/output connectors on the front panel and offer user selectable AC/DC coupling as well as fixed IEPE signal source (4mA/24VDC) via a 3 way switch.

A full range of filters are available including (must be specified when ordering, see graphs for filter responses)

• Butterworth
• Bessel
• Anti-aliasing
•General Purpose

Features

• Input Overload Indicator
• Switchable High/Low pass
• Single ended/differential input
• Modular system
• 6 gain steps to x50

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9 Channel Charge / Voltage Amplifier • IEPE Signal Conditioning • Rack Mounted

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CV9 rack mounted unit is the perfect partner for use in industrial or laboratory applications where signal conditioning and/or charge amplification is required. The CV9 is available in three versions offering maximum flexibility and return on investment. The 9 channel configuration makes it an ideal partner for use with 3 x triaxial accelerometers rather than the more traditional 8 channel configuration which reflects old fashioned electronic limitations.

The unit uses standard rack dimensions, so will integrate into a 19" rack, and is quick to set up.

Racks Available

• CV9-C – 9 Channel Charge Amplifier with variable gain.
• CV9-V – 9 Channel IEPE Signal Conditioner with variable gain.
• CV9-CV – 9 Channel IEPE Signal Conditioner, switchable to Charge Amplification, with variable gain. 

Features

• Short circuit/open circuit warning Indicator.
• IEPE Constant Current Source user selectable via internal jumpers from 2 to 14mA
• Individual channels have switchable Gain of x1, x10, and x100 for Charge and Voltage inputs.
• Front panel BNC input/output connectors.
• 19" Rack Mountable Enclosure.

Modules available:

3 Channel Voltage Amplifier • Input Range 1/31.6/100mV/g • Gain adjustable • Integrated Accelerometer PSU

 For Technical Data and Schematics

View Datasheet

IEPE Accelerometers feature an integrated QVC, converting the charges output from the piezoelectric sensor to a voltage, driving a low impedance voltagel superimposed on the supply line. Where the signal levels are adequate then minimal instrumentation is required to interface with the Accelerometer.

The V3/04 Voltage Source Amplifier is a three channel space saving solution to amplifying the signals from triaxial accelerometers. It includes the QVC constant current power supply required by IEPE Accelerometers, and open/short circuit indicatiors. The Instrument also features normalising and range amplifiers.

A coaxial lead is sufficient for connecting the accelerometers with the V3/04.

IEPE Accelerometers are immune to supply voltage noise but have limited line drive capability as connecting lead capacitance presents a reactive load. Where signal level is adequate, the minimal interface shown inthe datasheet of the indivial accelerometer will suffice. However, the V3/04 adds gain, calibration and monitoring enhancements to the measurement system, improving dynamic range and ease of use.

The normalising section provides an output of 100mV/g for transducer/QVC sensitivities within the range 1/110mV/g by means of a three decade digi-switch and x1/x100 multiplier switch directly set to transducer sensitivity.

Features

• Integrated PSU for driving Accelerometers.
• Fault and overload detection.
• Adjustable gain over the range x1 to x100 in 10db increments.