  
Special Products
The products shown below are some examples of customized developments.
Perhaps you will find here some ideas for your own application. If you
are looking for something else, please contact us and tell us your
request. Metra will react flexibly to your demand and provide a quick
and economic solution. We are at your disposal with the expertise from
over 40 years in the field of vibration measurement. |
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| Vibration Source |
EM1000 |
| Model EM1000 is a reference shaker providing a sinusoidal vibration signal of 1000 Hz and 2 m/s² (±5 %). It was designed to check the probe accelerometer KST94. Therefore it has the shape of the contactors which are tested with the KST94. The EM1000 is regularly channeled into the production line to check the noise detection system. It can also be used to recalibrate the measuring chain since it provides a precise and load independent vibration signal. The vibration exciter used for the EM1000 is a piezoelectric actuator. A built-in accelerometer with reference loop keeps the vibration level constant. The small case (45 mm x 55 mm x 75 mm) includes the complete circuit with generator, reference loop and power regulation. |
 Please click for details |
| Mould Oscillation Measuring System |
KS473/KHM |
| This product was developed
for quality control in a continuous cast process of a steel plant.
While the liquid steel is poured in, the mould has to perform an
up-and-down oscillation with a frequency of 1 to 3 Hz to keep friction
between the strand surface and the mould walls under a critical limit.
The oscillation of the mould weighing several tons is usually
generated by a powerful eccentric drive. In case of wear unwanted mould
oscillations in transverse direction may occur which may affect the
quality of the produced strand. Therefore it is important to measure in
regular intervals mould oscillation in main (Z) and transverse
direction (X/Y). The Mould Oscillation Measuring System consists of a triaxial piezoelectric accelerometer with high sensitivity and a rugged industrial notebook PC with built-in data acquisition board. The sensor is placed on top of the mould. Adjustable feet and a level are provided for axis alignment. The PC screen shows the displacement values for each direction and oscillation curves. The resolution of the measuring system is 0.1 mm with 5 % accuracy. |
  |
 Data
sheet (350 kB) |
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| Charge Amplifier Module |
DAQ-CHARGE |
| This signal conditioner
was developed for Dewetron
(Austria). It belongs to a wide range of sensor conditioner modules for
PC based data acquisition systems. The DAQ-CHARGE module is suited for
both charge and IEPE compatible
vibration transducers. It features 5 gain ranges, 2 integrators, 3
high pass filters and 5 low pass filters. Transducer sensitivity is
programmable. All settings can be made either by pushbuttons and LEDs
ore via a RS-485 interface. The DAQ-CHARGE module is characterized by
versatility and smallest dimensions. |
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| Data sheet (40 kB) |
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| Quadruple IEPE Front-End |
SP4 |
| This device is used as a
front end for mobile machine vibration measurement with a notebook PC.
It is connected to a PCMCIA data acquisition card which also provides
the supply voltage. Four Low Power IEPE transducers
can be connected. The signal may be amplified and filtered using FB2
low pass modules. |
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| Sensor for Cable Fault Detection |
T16/940 |
| This sensor was developed
for the ground borne sound locating device Digiphone of Hagenuk KMT. The unit is intended for
pinpointing faults of power cables. It detects ground vibrations which
are generated by flash-over faults using the sound field and distance
method. The sensor measures both vibration and magnetic fields. It
contains the electronic circuit for amplification and filtering. Its
plastic case with handle was designed for field use. Different
accessories are supplied for optimum adaptation of the sensor and
different surfaces. |
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| Device for Measuring Footstep Sound Insulation of Floor Coverings | |
| This instrument was
developed for a manufacturer of floor coverings in order to measure
footstep sound insulation to ISO 140 or DIN 52210. It generates
a reproducible shock impulse onto a sample of the floor covering and
measures the resulting shock acceleration. |
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| Vibration Sensor for Shot
Detection |
KSAP |
| This sensor was developed
for the detection of bullet impacts on shooting ranges. Its main
properties are a robust design and a very low price. Sensitivity is 25
mV/g. The 3 dB frequency range extends from 3 Hz to 5 kHz. The
resonance frequency is at 9 kHz. The sensor is mounted by an integral
M8 stud. |
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| M12
Vibration Monitor in Customized Case |
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| The photograph shows a
typical example of a customized packaging of the vibration monitor M12. The case additionally
includes a 24 VDC power supply, an LED bar graph display and a second
alarm LED with manual reset function. This product was designed as
an ice collision warning system for the propellers of an
icebreaker. |
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| IEPE
Conditioning Module |
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| This very compact sensor
conditioning module was designed for a frequency analyzer. It provides
from a 5V supply the IEPE constant current, four digitally selectable
gain ranges and a four-pole low pass filter. |
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