Accelerometers

Unique sensors for virtually any application in industrial vibration measurement

Accelerometers by PRUFTECHNIK

Reliable and precise measurement of machine vibration.

  • One sensor measures vibration acceleration, shock pulse (roller bearing condition) and cavitation in pumps.

  • Patented tandem-piezo technology eliminates the disadvantages of conventional sensor types.

  • Lossless signal transmission over long distances up to 1,000 meters with current line drive (CLD) signal amplification.

  • Various mounting types.

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Tandem-piezo accelerometer design
Tandem-Piezo accelerometer design

Current Line Drive
Frequency range and signal loss depend on cable length

Tandem-Piezo design - the benefits

The unique features of PRUFTECHNIKs patented Tandem-Piezo accelerometers make them suitable for virtually all areas of applications in industrial environments.

The unique design practically eliminates temperature shock and base strain effects; it also handles condition evaluation of turbo machinery and gearboxes, anti-friction bearings and pump cavitation - all with the same transducer, thanks to a wide linear range and a defined shock pulse resonance characteristic at 36 kHz.

The built-in current line drive amplifier ensures immunity to ground looping and extremely low signal loss, even over long transmission distances, as well as compatibility with the entire PRUFTECHNIK line of mobile data collectors, FFT analyzers and online or remote condition monitoring equipment.

Despite the technologically advanced tandem-piezo design, these sensors are more economical than conventional compressor sensors. 

Tandem-Piezo accelerometer at a glance:

  • Low base strain sensitivity
  • Low sensitivity to temperature transients
  • Built-in ‘Linedrive’ amplifier offers unsurpassed immunity against cable noise and ground loops
  • Low transverse sensitivity
  • High shock resistance
  • Integrated resonance suppression filters avoids amplifier overloading
  • Factory burn-in for high long-term stability
  • Intrinsically safe version also available

 

 

 

 

Current Line Drive (CLD) - the advantages

The long cables used in permanently installed monitoring systems must stand up to considerable electrical and mechanical interference. With traditional sensors the signals barely get through the network, being drowned out by the noise and interference.

The solution: use either expensive high-quality cable carefully laid away from interference sources or a ‘line drive’ system, which consists of a tiny electronic amplifier built into each sensor which boosts the vibration signal.
The latter offers several advantages:

  • Low sensitivity to mechanical and electrical interference (cable noise, electromagnetic sources, ground looping)
  • Very long low-cost cables possible with very little signal loss
  • Cable positioning during installation is not as critical
  • Power supply current carried along the very same coaxial cable carrying the vibration signal (power comes from a source built into the receiver instrument).

 

There are two types of line drive systems, providing either voltage output or current output. PRUFTECHNIK systems use the latter, since it is a superior system with more sophisticated electronics and the following significant advantages:

  • Much lower high frequency loss in very long cables even over 1000 meters.
  • Much lower susceptibility to induced noise and ground-loop noise, also obviating in most cases the need for insulated sensors.

 

High frequency loss in long cables
The PRUFTECHNIK current line driver system has much lower high frequency loss in long cables than voltage output systems. This is because the instrument has a significantly lower input impedance, and since the maximum frequency is inversely proportional to input impedance, the maximum frequency is greatly extended.


Ground looping and noise
The PRUFTECHNIK current line driver system has much lower susceptibility to induced noise and ground-loop noise than voltage output systems. This is because the very low instrument input impedance minimizes influence from electromagnetic fields. The instrument virtually 'shorts' the cable conductors.
This has the added advantage that, with the exception of frequency rectifier-governed motors and high-voltage motors, costly insulated sensors can be avoided, eliminating the problem of insulator capacitance.

    Standard industrial accelerometers by PRUFTECHNIK

    Industrial accelerometers

    Types VIB 6.10x, VIB 6.12x, VIB 6.13x, VIB 6.14x

    • Standard accelerometers for PRÜFTECHNIK condition monitoring systems
    • Tandem-piezo sensor
    • Current line drive (CLD) signal amplification
    • Mounting options: bonded, threaded, magnetic
    • IP68 option
    • Measures vibration acceleration, shock pulse (roller bearing condition), cavitation in pumps
    • Intrinsically safe version available as option.

     

    For more information please refer to our sensor catalog.

     

    Technical data (excerpt)

    ParametersStandardLow-speed
    Frequency range (±3dB)   1 Hz ... 20 kHz0.3Hz ... 10 kHz
    Linearity range (±10%)961 ms-²450 ms-²
    Sensitivity1µA/ms-²5.35µA/ms-²
    Resonance frequency36 kHz17 kHz

     

     

     

    Mini sensor – types VIB 6.202, VIB 6.203

    Mini sensors

    Types VIB 6.202, VIB 6.203

    • Compact design
    • Space-saving cable routing
    • Economically priced
    • Tandem-piezo measuring element
    • Current line drive (CLD) signal amplification
    • Mounting options: bolted, glued, magnetic
    • Vibration acceleration, shock pulse (roller bearing condition), cavitation in pumps
    • Intrinsically safe versions available.

     

    For more information please refer to our sensor catalog.


    Technical data (excerpt)

    Frequency range (±3dB)2 Hz ... 20 kHz
    Linearity range (±10%)961 ms-²
    Sensitivity1µA/ms-²
    Resonance frequency30 kHz

     

    Accelerometers for low speed machiney – VIB 6.195, VIB 6.172

    Accelerometers for low speed machinery

    Types VIB 6.172, VIB 6.195

    • For low running speeds: starting at 6 RPM (=0.1 Hz)
    • ICP voltage output (VIB 6.172) or current line drive signal amplification (VIB 6.195)
    • Mounting options: bolted, glued ,magnetic (VIB 3.423)
    • ICP sensor also available with intrinsic safety.

     

    For more information please refer to our sensor catalog.

     

    Technical data (excerpt)

    ParametersVIB 6.172VIB 6.195
    Frequency range (±3dB)0.1 Hz ... 10 kHz0.1 Hz ... 10 kHz
    Linearity range< 70 g (r.m.s.) (±1%)450 m/s-² (±10%)
    Sensitivity100 mV/g5.35 µA/ms-²
    Resonance frequency17 kHz17 kHz

     

    TIPTECTOR hand-held probe

    TIPTECTOR

    Hand-held probe for mobile vibration measurements – VIB 8.606

    • Good signal transfer due to optimized probe tip
    • Extendable handle
    • Tandem-piezo measuring element
    • Current line drive (CLD) signal amplification
    • Vibration acceleration, shock pulse (roller bearing condition), cavitation in pumps
    • Intrinsically safe version available.

     

    For more information please refer to our sensor catalog.

     

    Technical data (excerpt)

    Frequency range (±3dB)10 Hz ... 10 kHz
    Linearity range (±10%)50 ms-²
    Sensitivity1µA/ms-²
    Resonance frequency36 kHz

     

    Hybrid Triaxial Accelerometer by PRUFTECHNIK

    Hybrid Triaxial Accelerometers for advanced online CMS

    Types VIB 6.215, VIB 6.216

    • Simultaneous vibration measurement in X, Y and Z direction
    • Gravitational acceleration and vibration acceleration
    • MEMS and Tandem-Piezo measuring element
    • Bonded mounting
    • ICP voltage output
    • Only for VIBGUARD online CMS

     

    For more information please refer to our sensor catalog.

     

    Technical data (excerpt)

    ParametersVIB 6.215VIB 6.216
    Frequency range (±3dB)X,Y: 0 Hz ... 1 kHz
    Z: 1 Hz ... 10 kHz
    X,Y: 0 Hz ... 1 kHz
    Z: 0.1 Hz ... 10 kHz
    Measurement range (0-p)

    X,Y: 19.6 m/s2

    Z: 400 m/s2

     

     

    Triaxial Accelerometer for portable vibration analyzers

    Type VIB 6.655

    • Simultaneous vibration measurement in X, Y and Z direction
    • Mounting via threaded connection or magnetic adapter
    • ICP voltage output
    • Only for VIBXPERT I and VIBXPERT II

     

    Technical data (excerpt)

    Frequency range (±3dB)0.6 Hz ... 10 kHz
    Linearity range (±10%)50g (peak)
    Sensitivity100 mV/g

     

     

    Hand-held combi accelerometer – VIB 6.162
    Online Combi Sensor - VIB 6.163

    Hand-held accelerometer for vibration and temperature measurements 

    Type VIB 6.162

    • Vibration and temperature with one sensor
    • Stable connection via magnetic adapter
    • Tandem-piezo measuring element
    • Current line drive (CLD) signal amplification
    • Available only with intrinsic safety

     

    Online Combi Sensor

    Type VIB 6.163

    • Vibration, bearing condition and temperature with one sensor
    • Tandem-piezo measuring element
    • Current line drive (CLD) signal amplification
    • Threaded mounting
    • Connected to online CMS (VIBNODE, VIBROWEB,...)

     

    For more information please refer to our sensor catalog.

     

    Technical data (excerpt)

    ParametersVIB 6.162VIB 6.163
    Frequency range (±3dB)2 Hz ... 2 kHz0.8 Hz ... 20 kHz
    Sensitivity 1 µA/ms-²1 µA/ms-²
    Resonance frequency 3.7 kHz26 kHz
    Linearity range (±10%)

    961 m/s²

    961 m/s²
    Temperature measurement range-30°C  ... +100°C-20°C  ... +100°C