Wilcoxon’s 4-20 mA vibration sensors incorporate an accelerometer, data acquisition circuitry, and vibration transmitter in a rugged industrial housing. The explosion-proof sensor provides a 4-20 mA output signal proportional to the overall acceleration level.

The 4-20 mA output is commonly accepted by process control systems including PLC, DCS or SCADA for Effective continuous vibration monitoring. Simplified condition based maintenance can be performed on machinery without the investment and learning curve associated with traditional vibration monitoring systems.

The acceleration-output sensor gives a signal with increased sensitivity to higher frequencies which can help indicate bearing wear and gear mesh conditions. 4-20 mA sensors are specified by their full scale values, where a “-10” sensor is designed with a full scale range of 10 g’s equivalent to 20 mA.

By trending overall acceleration, changes can be monitored and when a predetermined increase is reached, an informed decision to shut down machinery can be made.


  • RMS, peak equivalent or true peak detection
  • Explosion proof certified
  • Corrosion resistant
  • Provides continuous trending of overall machine vibration
  • Hermetically sealed
  • Reverse wiring protection
  • Manufactured in an approved ISO 9001 facility
The above description encapsulates the entire product series. Specifications for individual configurations may vary depending on the selection chosen.

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PC420A-EX Series

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Agency Approvals

  • ATEX Ex II 2 G Ex d IIC T3 II 3 G Ex nA IIC T3 -40° C ≤ Ta ≤ 85° C
  • CE
  • CSA Class I, Division 1, 2 Groups A, B, C, D Class II, Division 1, 2 Groups E, F, G Class III T3C Ta = 85° C (185° F) Maximum

Tests & Certificates

  • ISO 9001

Environmental Protection

  • Corrosion Resistant
  • Explosion-Proof

Temperature Range

  • -40° to 85° C (-40° to 185° F)


  • ±2%


  • Transverse Sensitivity, Maximum: 5%


  • Vibration Limit: 250g Peak


  • Shock Limit: 2,500g Peak

Process Connection - Threaded

  • 1" Male NPT

Power Requirement

  • 2-wire Loop Power (Voltage at Sensor Terminals): 14-30 Vdc

Electrical - Free Leads

  • Output Leads, 18 AWG: 13 feet (396.24 cm)

Loop Resistance

  • 100 to 1,000 Ohms Maximum at 12-30 Vdc
  • 700 Ohms at 24 Vdc, Maximum


  • Frequency Response (±10%): 10 Hz to 1 kHz
  • Frequency Response (±3 dB): 4 Hz to 2 kHz

Circuit Protection

  • Reverse Wiring Protection

Turn-On Time

  • 4-20 mA Loop: <10 Seconds


  • Minimum RL Wattage Capability: 0.125 to 0.5 W


  • 3/8-24 x 3/8 Depth Tapped Hole

Enclosure/Body Material

  • 303 Stainless Steel


  • Sensing Element Design: PZT, Shear

Seat/Seal Material

  • Sealing: Epoxy Sealed

Seal Type

  • Hermetic