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kManfred Weber
Metra Mess- und Frequenztechnik in Radebeul
D-01445 Radebeul
Phone +49-351-836 2191 Fax +49-351-836 2940
Instruction Manual
Vibration Velocity Sensor / Transmitter KSI 80VC / KSI 82VB
1.Purpose
The vibration velocity transducers KSI 80VC / KSI 82VB are intended for continuous monitoring of
rotating machinery for trending or shutdown based on standard ISO 10816. The rugged, double shielded
and electrically insulated design allows applications under harsh environmental conditions. The sensors
provide a filtered and rectified output signal which is compatible with 4-20 mA current loop standard.
Hence it can be directly connected to standard equipment such as PLCs, panel meters or current relays.
Additional equipment for sensor supply and signal conditioning is not necessary.
The frequency ranges are 1.5 to 1000 Hz with model KSI 80VC and 10 to 1000 Hz with model
KSI 82VB.
Both types are available in two versions each with 20 mm/s nominal range (models KSI 80VC-20 /
KSI 82VB-20) and with 40 mm/s nominal range (models KSI 80VC-40 / KSI 82VB-40).
The sensors require no calibration.
2.Function
In spite of their small dimensions models KSI 80VC and KSI 82VB feature a complex signal conditioning
circuit. The main components are shown in Figure 1.
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Figure 1: Block diagram and external connections
The sensing element is a precise piezoceramic ring-shear system. It measures vibration acceleration. The
acceleration signal is amplified followed by an integrator for vibration velocity. The signal is high pass
filtered at 1.5 Hz (KSI 80VC) or 10 Hz (KSI 82VB) and low pass filtered at 1000 Hz with 2 pole filters.
The frequency band of model KSI 82VB from 10 to 1000 Hz is usually sufficient for vibrations caused by
unbalance. It is also recommended in standard ISO 10816-1. In some applications with slow running
machinery it may be necessary to measure from 1.5 to 1000 Hz with model KSI 82VB.
A true RMS rectifier and a 4-20 mA current loop converter make the signal ready for long distance
transmission.
With the KSI 80VC / KSI 82VB no separate power supply is required. The sensor is loop powered.
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Summary of Contents for MMF KSI 80VC-20
- Page 1 The frequency ranges are 1.5 to 1000 Hz with model KSI 80VC and 10 to 1000 Hz with model KSI 82VB. Both types are available in two versions each with 20 mm/s nominal range (models KSI 80VC-20 / KSI 82VB-20) and with 40 mm/s nominal range (models KSI 80VC-40 / KSI 82VB-40).
- Page 2 3.Mounting and Connection Mounting An important condition for accurate vibration measurement is the selection of suitable measuring points on the structure. For this purpose it can be helpful to consult a specialist with experience in machine monitoring. In general, it is advisable to measure vibration as near as possible to its source. This will minimize distortion of the measured signal by transmitting mechanical components.
- Page 3 drop of 12 VDC across its terminals. Figure 2 shows the permissible limits for the load resistor R against the loop supply voltage U Rmax(25mA) Rmin(85°C) Rmin(25°C) Us / V Figure 2: Permissible range for the load resistor against loop supply voltage Please make sure that the loop supply voltage U is free of ripple.
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Page 4: Technical Data
6.Technical Data KSI 80VC-20 KSI 80VC-40 KSI 82VB-20 KSI 82VB-40 Output: RMS of vibration velocity, 4-20 mA Measuring range (v .. v 0.2 .. 25 mm/s 0.4 .. 50 mm/s 0.2 .. 25 mm/s 0.4 .. 50 mm/s Nominal value at 20 mA:...
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