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Overview

Hazardous Location VRS Sensor, 15,9 mm [0.625 in] M16 diameter, 30 Vp-p, -55 ºC to 120 ºC [-67 ºF to 250 ºF], 16 DP (module 1.58) or coarser, 40 kHz, 65 mm [2.55 in] approx. length.

Hazardous Location VRS sensors are designed for use in locations where explosion-proof or intrinsically safe sensors are required.

Passive VRS (Variable Reluctance Speed) Magnetic Speed sensors are simple, rugged devices that do not require an external voltage source for operation.

A permanent magnet in the sensor establishes a fixed magnetic field. The approach and passing of a ferrous metal target near the sensor’s pole piece (sensing area) changes the flux of the magnetic field, dynamically changing its strength. This change in magnetic field strength induces a current into a coil winding which is attached to the output terminals.

The output signal of a VRS sensor is an ac voltage that varies in amplitude and wave frequency as the speed of the monitored device changes, and is usually expressed in peak to peak voltage (Vp-p).

One complete waveform (cycle) occurs as each target passes the sensor’s pole piece. If a standard gear were used as a target, this output signal would resemble a sine wave when viewed on an oscilloscope.

Honeywell also offers VRS sensors for general purpose, high output, power output, high resolution and high temperature.

3042A Passive Speed Sensors - Honeywell


Technical Specifications

Output Voltage (Peak to Peak) Min. 30 Vp-p
Operating Frequency 40 kHz
Diameter 15,9 mm [0.625 in]
Mounting Thread 5/8-20 UNF-2A
Material Stainless Steel Threaded
Available Metric Thread M16
Housing Length 65 mm [2.55 in]
Termination MS3106 Connector
Operating Temperature -55 °C to 120 °C [-67 °F to 250 °F]
Gear Pitch Range 16 DP (Module 1.58) or Coarser
Optimum Actuator 12 DP (Module 3.17) Ferrous Metal Gear
Surface Speed 0,38 m/s [15 in/s]
Test Condition Specifications Surface Speed = 25 m/s [1000 in/s], Gear = 8 DP [Module 3.17), Air Gap = 0.127 mm [0.005 in], Load Resistance = 100 kOhm
Coil Resistance 150 Ohm
Pole Piece Shape and Size Round; 3,96 mm [0.156 in] Diameter
Inductance 26 mH
Vibration MIL-STD 202F, Method 204D
Weight 70 g [2.5 oz]
Comments When properly installed using the intrinsic safety protection method connected per the single and dual channel barrier control drawings, this catalog listing is intrinsically safe for hazardous locations as follows: Class I, Groups A, B, C, D. This product has been tested to and meets the requirements of applicable U.S. and Canadian specifications for these locations.
Series Name Hazardous Location

Technical Specifications

Output Voltage (Peak to Peak) Min. 30 Vp-p
Operating Frequency 40 kHz
Diameter 15,9 mm [0.625 in]
Mounting Thread 5/8-20 UNF-2A
Material Stainless Steel Threaded
Available Metric Thread M16
Housing Length 65 mm [2.55 in]
Termination MS3106 Connector
Operating Temperature -55 °C to 120 °C [-67 °F to 250 °F]
Gear Pitch Range 16 DP (Module 1.58) or Coarser
Optimum Actuator 12 DP (Module 3.17) Ferrous Metal Gear
Surface Speed 0,38 m/s [15 in/s]
Test Condition Specifications Surface Speed = 25 m/s [1000 in/s], Gear = 8 DP [Module 3.17), Air Gap = 0.127 mm [0.005 in], Load Resistance = 100 kOhm
Coil Resistance 150 Ohm
Pole Piece Shape and Size Round; 3,96 mm [0.156 in] Diameter
Inductance 26 mH
Vibration MIL-STD 202F, Method 204D
Weight 70 g [2.5 oz]
Comments When properly installed using the intrinsic safety protection method connected per the single and dual channel barrier control drawings, this catalog listing is intrinsically safe for hazardous locations as follows: Class I, Groups A, B, C, D. This product has been tested to and meets the requirements of applicable U.S. and Canadian specifications for these locations.
Series Name Hazardous Location

Documents

TITLE DOCUMENT TYPE LANGUAGE SIZE
Hazardous Location Series Industrial VRS Magnetic Speed Sensors Datasheet English 244KB
Single and Dual Channel Barrier Control Drawing Technical Information English 65KB
Speed Sensors Range Guide Product Range Guide English 767KB
Sensors and Switches in Front Loaders Application Note English 3MB
VRS Industrial Magnetic Speed Sensors Application Note Application Note English 530KB
VRS Sensor Application Notes Application Note English 101KB
VRS Output Voltage Calculations Technical Information English 46KB
Magnetic Sensors Line Guide Line Card/Selection Chart English 359KB

Product Features

  • Self-powered operation
  • Direct conversion of actuator speed to output frequency
  • Simple installation
  • No moving parts
  • Designed for use over a wide range of speeds
  • Adaptable to a wide variety of configurations
  • Customized VRS products for unique speed sensing applications
  • Housing diameters: 3/4 in, 5/8 in
  • Housing material/style: stainless steel threaded
  • Terminations: MS3106 connector, preleaded
  • Output voltages: 30 Vp-p to 60 Vp-p

Applications

  • Engine RPM (revolutions per minute) measurement on aircraft, automobiles, boats, buses, trucks and rail vehicles
  • Motor RPM on oil and gas drilling equipment and machinery
  • Motor RPM measurement on drills, grinders, lathes and automatic screw machines
  • Process speed measurement on food, textile, paper, woodworking, printing, tobacco and pharmaceutical industry machinery
  • Motor speed measurement of electrical generating equipment in grain elevators, sawmills and other potentially explosive environments
  • Speed measurement of pumps, blowers, mixers, exhaust and ventilating fans
  • Gear speed measurement

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