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The Thrumold Series VRS (Variable Reluctance Speed) sensors are designed to detect engine timing and transmission speed by determining the speed and position of rotating shafts in heavy-duty, off-road, and construction vehicles, providing information to help improve engine combustion process efficiency. These passive VRS 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 frequency as the speed of the monitored device changes, and is usually expressed in peak to peak voltage (Vp-p). One complete cycle occurs as each tooth passes the sensor’s pole piece. If a standard gear were used as a target, this output signal would resemble a sine wave if viewed on an oscilloscope.
Transportation VRS Thrumold Series


honeywell-sensing-vrs-sensors-thrumold-series-datasheet-32303003-a-en.pdf Datasheet English 504KB
honeywell-sensing-vrs-sensors-thrumold-series-installation-instructions-32312331-a-en.pdf Datasheet English 317KB
Speed Sensors Range Guide Product Range Guide English 767KB
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

Browse Transportation VRS Thrumold Series Products

Product Output Voltage (Peak to Peak) Min. Mounting Thread Diameter Housing Length
TM-HAADA 30 Vp-p to 48 Vp-p M18X1.5 6G
TM-HBADA 30 Vp-p to 48 Vp-p 5/8-18 UNF-2A thread size
TM-LDADA 21 Vp-p to 35 Vp-p M16X1.5 6G


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