The bi-directional shaft tachometer system consists of two proximity sensors, a signal conditioner (STC-206C) and an analog meter (STC-AMT). The sensors detect the scanning target (mounted on the rotating shaft of the machinery) and produce a frequency signal which is converted into a linear output signal (by the signal conditioner) and fed into the analog meter.

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  • Accurate and reliable
  • Speed range from 0 rpm up to 2000 rpm
  • Bi-directional operation (using a single target)
  • Wide air gap between pickup and target (<= 5mm)
  • Independent zero and span adjustments
  • High quality, illuminated panel meter
  • Able to drive two panel meters in parallel


Best suited for monitoring speed and direction of rotation of marine propeller shafts and other low to moderate speed machinery.

Connection Diagram


Ordering Information

  • STC-206C: Analog Signal Conditioner Unit for STC-206 System
  • STC-AMT: Bi-Directional Analog RPM Meter
  • STC-PXS: Proximity Sensor with 2m cable and connector
  • STC-BKT: Bracket for STC-PXS (Proximity Sensors)
  • STC-TGT: Magnetic Target with Belt and Clip (attached around propeller shaft)
  • STC-206(SET1): Analog Bi-Directional Shaft Tachometer System consisting of 1 x STC-206C, 1 x STC-AMT, 2 x STC-PXS, 1 x STC-BKT, 1 x STC-TGT


Scale Type Standard (200, 400, 500 or 600 rpm)Custom (Available on request)
Scale Range250 deg Deflection, 0 to 2000 rpm (per direction)
Scale IlluminationLED Illuminated Dial
Operating Voltage: 24 VDC
Scale CalibrationZero adjustment (electrical and mechanical),
Span Adjustment (electrical)
Scale Accuracy+/- 1 % of full scale
Sensor2 x Proximity Switch (w/ bracket and scanning target)
Detection Distance <= 5mm
Input Voltage24 VDC
Operating Temperature-20 to 50 degC
Operating Relative Humidity0 to 95% (non-condensing)
ConstructionSTC-AMT: Dust-Protected Plastic CaseSTC-206C: IP55 PVC Enclosure
WeightSTC-AMT: 500 g
STC-206C: 450 g
Dimensions(mm)STC-AMT: 100(H) x 110(W) x 85(D)
STC-206C: 120(H) x 165(W) x 80(D)
Warranty1 Year


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