Wilcoxon’s 4-20 mA vibration sensors integrate easily with an existing PLC, DCS or SCADA system. The PC420A series dual output sensors provide 24/7 monitoring of overall machine vibration for continuous trending, alerting users to changing machine conditions and helping to guide maintenance in prioritizing the need for service. The choice of true RMS, true peak or peak output allows you to choose the sensor that best fits your industrial requirements. True peak is useful for detecting loose parts such as valves on reciprocating machinery.

The 4-20 mA output of the PC420A series is proportional to acceleration vibration. An output of 4 mA indicates a level of 0 g or no vibration present. A full-scale reading of 20 mA indicates that the maximum range (RMS or peak) of vibration is present. The dynamic output signal is derived from an internal buffered amplifier. The dynamic output requires the 4-20 mA loop be powered. No constant-current supply diode is necessary, the BOV at the dynamic output is developed by the internal amplifier.


  • Peak equivalent, true RMS or true peak output
  • Corrosion resistant
  • Hermetically sealed
  • ESD protection
  • Overload protection
  • Reverse wiring protection
  • Dynamic signal output
The above description encapsulates the entire product series. Specifications for individual configurations may vary depending on the selection chosen.

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PC420A Dual Output Series

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Agency Approvals

  • CE

Environmental Protection

  • Corrosion Resistant

Temperature Range

  • -40° to 85° C (-40° to 185° F)


  • Sensitivity, ±10%: 100 mV/g (PC420Ax-yy-DA)
  • Sensitivity, ±10%: 100 mV/in/sec (PC420Ax-yy-DV)
  • Transverse Sensitivity: Maximum 5%


  • ±2%

Non Linearity

  • Amplitude Nonlinearity: Maximum 1%


  • Vibration Limit: 250g Peak


  • Shock Limit: 2,500g Peak

Power Requirement

  • 2-wire Loop Power (Voltage at Sensor Terminals): 10-30 Vdc

Loop Resistance

  • 100 to 1,000 Ohms Maximum
  • Maximum 700 Ohms at 24 Vdc


  • Frequency Response (±10%): 10 Hz to 1 kHz
  • Frequency Response (±3 dB%): 4 Hz to 2 kHz
  • Resonant Frequency, Mounted, Nominal: 25 kHz

Electrical Connectors

  • Cable (J9T3A)
  • Mating Connector: R6G Type
  • Output Connector: 3-Pin, MIL-C-5015 Style

Circuit Protection

  • Overload Protection
  • Reverse Wiring Protection

Turn-On Time

  • 4-20 mA Loop: <30 Seconds


  • Minimum Wattage Capability: 0.125 to 0.5 W at 12-30 Vdc


  • 1/4-28 Tapped Hole

Enclosure/Body Material

  • 316L Stainless Steel


  • Sensing Element Design: PZT Ceramic, Shear

Seal Type

  • Hermetic


  • Dynamic Output Noise, Equivalent g, 2.5 Hz to 10 kHz: 2 mg (PC420Ax-yy-DV)
  • Dynamic Output Noise, Equivalent g, 2.5 Hz to 10 kHz: 0.002 ips (PC420Ax-yy-DA)