Manfred Weber
Metra Mess- und Frequenztechnik in Radebeul e.K.
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.
Sensor Applications
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Probe Accelerometer KST94
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Mould Oscillation Measuring System KS473/KHM
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Sensor for cable fault detection T16/940
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Device for Measuring Footstep Sound Insulation of Floor Coverings
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Examples of Customized Accelerometers
Signal Conditioning
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Charge Amplifier Module DAQ-CHARGE
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M12 in a customized case
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Four-channel-IEPE frontend
Vibration Excitation
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Vibration Source EM1000
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 bargraph 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.
KST94
The piezoelectric probe-type Accelerometer model KST94 was developed for Siemens AG as a manufacturer of contactors. During large-scale production each contactor has to pass a vibration test. This test is necessary to sort out
devices generating unusual loud noise in their electromagnetic system. The vibration test has to be accomplished within a production cycle which is only a few hundred milliseconds long.
The cylindrical case of the KST94 case has 25 mm diameter and 60 mm length. For the measurement it is pressed against the body of the specimen by pneumatic force. The sensor features a movable tip which can perform up to 10 mm stroke. The sophisticated spring system is vibration insulated from its outer shell to avoid avoid the influence of environmental vibration. The KST94 can measure vibration between
45 Hz and 3 kHz. The IEPE compatible output is accessible via a UNF 10-32 socket. A signal conditioner of M68 series is used for further processing.
Data Sheet (PDF, approx. 160 kB)
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EM1000
The EM1000 is a reference shaker providing a sinusoidal vibration signal of 1000 Hz and 2 m/s² (±5 %). It belongs to the probe accelerometer KST94 described above. 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.
Data Sheet (PDF, approx. 95 kB)
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KS823
This triaxial accelerometer was developed for measuring building vibration in a dam project. The pressure-proof case is intended for submersion in liquid concrete. The KS823 features a hook for hanging it up while the concrete hardens. The compact sensing element reaches a sensitivity of 400 mV/g making it possible to detect lowest vibration. The KS823 has an IEPE output
Please note also the underwater pressure case for sensors Model 700.
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 (PDF, approx. 300 kB)
Instruction manual (PDF, approx. 300 kB)
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 highpass filters and 5 lowpass 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.
Data Sheet (PDF, approx. 40 kB)
SP4
This device is used as a frontend 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.
T16/940
This sensor was developed for the groundborne 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.
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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KS823
This triaxial accelerometer was developed for measuring building vibration in a dam project. The pressure-proof case is intended for submersion in liquid concrete. The KS823 features a hook for hanging it up while the concrete hardens. The compact sensing element reaches a sensitivity of 400 mV/g making it possible to detect lowest vibration. The KS823 has an IEPE output.
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.
Customized Accelerometers and Accessories
In addition to our standard range of sensors we have been making a variety of
customized versions. We also offer custom-made mounting accessories. Click here, for example, to see a list of special mounting magnets with various
thread sizes.
Please ask us if no standard product meets your requirements. Even manufacturing only one piece may be profitable. Benefit from our experience and check out or flexible
development and manufacturing facilities.
Last update: 05.02.10
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