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.
Output Voltage (Peak to Peak) Min. | 60 Vp-p |
Operating Frequency | 40 kHz |
Diameter | 19,5 mm [0.750 in] |
Mounting Thread | 3/4-20 UNEF-2A |
Material | Stainless Steel Threaded |
Housing Length | 122 mm [4.80 in] |
Termination | 18 AWG PVC-Insulated Leads, 3000 mm [120 in] |
Operating Temperature | -73 °C to 93 °C [-100 °F to 200 °F] |
Gear Pitch Range | 12 DP (Module 2.11) or Coarser |
Optimum Actuator | 8 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 | 191 Ohm to 280 Ohm |
Pole Piece Shape and Size | Round; 4,75 mm [0.187 in] Diameter |
Inductance | 115 mH |
Vibration | MIL-STD 202F, Method 204D |
Weight | 322 g [11.5 oz] |
Comments | When properly installed using the explosion containment method, this product is certified for use in hazardous locations as follows: Class I, Groups A, B, C, D; Class II Groups E, F, G; Class III. 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. | 60 Vp-p |
Operating Frequency | 40 kHz |
Diameter | 19,5 mm [0.750 in] |
Mounting Thread | 3/4-20 UNEF-2A |
Material | Stainless Steel Threaded |
Housing Length | 122 mm [4.80 in] |
Termination | 18 AWG PVC-Insulated Leads, 3000 mm [120 in] |
Operating Temperature | -73 °C to 93 °C [-100 °F to 200 °F] |
Gear Pitch Range | 12 DP (Module 2.11) or Coarser |
Optimum Actuator | 8 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 | 191 Ohm to 280 Ohm |
Pole Piece Shape and Size | Round; 4,75 mm [0.187 in] Diameter |
Inductance | 115 mH |
Vibration | MIL-STD 202F, Method 204D |
Weight | 322 g [11.5 oz] |
Comments | When properly installed using the explosion containment method, this product is certified for use in hazardous locations as follows: Class I, Groups A, B, C, D; Class II Groups E, F, G; Class III. This product has been tested to and meets the requirements of applicable U.S. and Canadian specifications for these locations. |
Series Name | Hazardous Location |
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 |