Analogue single-channel measuring amplifier / evaluation board for measuring relative shaft vibrations with eddy current sensors
  • Compact top-hat rail module
  • Peak value evaluation (0-P/P-P)
  • Measuring range -4...-20mV / 1 ... 1000µm
  • Supply voltage 18...30 VDC
  • Output signal 4...20 mA
  • Decoupled raw signal output for verification
  • Integrated sensor power supply
  • Integrated sensor / self-monitoring

Technical data

Measuring range  -4...-20mV / 1...1000µm
Suitable sensors / measuring chains Eddy current sensors with signal converter
Type of evaluation Peak rectification (0-P / P-P)
Supply voltage WS module 18 ... 36 VDC
Current consumption WS module max. 130 mA
Power supply signal converter / measuring chain -24VDC / 35mA
Measuring range setting by fixed resistor
Tape fit adjustment by fixed equipment
Default setting Uin: -4...-20VDC / 0...250mm / Iout 4...20mA
Measuring circuit monitoring Power failure / signal error
Output signal in case of error 0mA / green LED goes out
Hold time error signal (0mA) 20 seconds
Material module housing Polycarbonate
Protection (DIN 40050) IP 20
Permissible operating temperature -20 ... +70 °C
Electrical connection according to UL standard AWG/kcmil: 30-12
Clamps for wire cross-section 0,2 up to 1 mm2

Circuit diagram and function

Signal processing

The output signal of the sensor is divided into three function paths at the signal input:

Signal conditioning
Decoupling for the analysis output
Measuring circuit monitoring

In signal conditioning, the AC signal is normalised to the measuring range, passed through a bandpass filter and rectified in the peak value rectifier. The signal is converted into a standard current signal and output as a 4...20 mA signal.

At the test output, the sensor signal is available unfiltered and decoupled for measuring and analysis purposes.

The measuring circuit monitoring detects a sensor defect as well as a power failure. In the event of a fault, the current output is switched to 0 mA and the green LED goes out.


Circuit diagram WS-Module

Dimensional drawings

Compact design

Housing dimensions approx. 90 x 62 x 2TE

Dimensional drawing modules
WS Module basic dimensions


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