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 cost-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