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Series 18

Series 18

Shaft Speed Sensor


  • FM Approved Intrinsically Safe (IS) Class I, Div 1, A → D; Class II Div 1 E→G; Class III A Ex / Ex ia II c
  • NEMA 4X, IP 65


  • Housing:
    - Basic Corded
    - M12 Eurofast Connector
    - ½ NPT Female Conduit Port
    - ½ Flex Liquid-Tight Conduit Fitting
  • Sensing (Hall Effect, Magnetoresistive)
  • Signal (Single or Quadrature)
  • Output (NPN or PNP)
  • Termination (Open-Collector or Terminated)
  • Cable length
  • Temperature (Standard or Wide Temperature)

Series 18 sensors detect passing magnets of a shaft-mounted pulser disc or wrap and output a voltage pulse frequency directly proportional to the shaft rotation speed. All models work with all Electro-Sensors pulser targets (discs and wraps) and operate down to zero speed. All models have rugged stainless steel M18x1 housings, epoxy-filled and sealed against liquids/dust and come with two stainless steel hex jam nuts and a bracket. 

Many housing, sensing, signaling, output, cable length and temperature options are available (see below).

Building a Model Number

Series 18 Build a Model


18BHSNO-010:  Basic housing, Hall Effect, single signal, npn, open-collector, 10 ft cable
18EHQPT:  Eurofast housing, Hall Effect, quadrature signal, pnp, terminated
18RMSPO-025-W:  ½ NPT conduit housing, Magnetoresistive, single signal, pnp, open-collector, 25 ft cable, wide-temp.

Optional EZ-18mm Easy Sensor Mount
(see EZ-18mm page for more details)

Series 18 Sensors with EZ -18mm MountFeatures
Mounts directly to the tapped shaft
•  Can be used with optional Mounting Magnet  if shaft is not tapped
•  Pulser disc is included (8 PPR) with optional EZ-18mm unit
•  EZ-18mm is for Series 18, ST420 Series, and  SpeedTalker Sensors