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.
Output Voltage (Peak to Peak) Min. | 21 Vp-p to 35 Vp-p |
Operating Frequency | 40 kHz typ. |
Mounting Thread | M16X1.5 6G |
Material | Stainless steel |
Housing Length | 83 mm [3.25 in] |
Termination | Deutsch DT04 connector |
Operating Temperature | -40 °C to 120 °C [-40 °F to 248 °F] |
Optimum Actuator | 8 DP |
Surface Speed | 5.9 IPS (0.15 m/s) typ. |
Coil Resistance | 1270 Ohm to 1630 Ohm |
Vibration | 20 G RMS from 24 Hz to 2000 Hz >50 MOhm |
Weight | 72 g [2.54 oz] approx. |
Series Name | Thrumold |
Technical Specifications
Output Voltage (Peak to Peak) Min. | 21 Vp-p to 35 Vp-p |
Operating Frequency | 40 kHz typ. |
Mounting Thread | M16X1.5 6G |
Material | Stainless steel |
Housing Length | 83 mm [3.25 in] |
Termination | Deutsch DT04 connector |
Operating Temperature | -40 °C to 120 °C [-40 °F to 248 °F] |
Optimum Actuator | 8 DP |
Surface Speed | 5.9 IPS (0.15 m/s) typ. |
Coil Resistance | 1270 Ohm to 1630 Ohm |
Vibration | 20 G RMS from 24 Hz to 2000 Hz >50 MOhm |
Weight | 72 g [2.54 oz] approx. |
Series Name | Thrumold |
TITLE | DOCUMENT TYPE | LANGUAGE | SIZE |
honeywell-sensing-vrs-sensors-thrumold-series-datasheet-32303003-a-en.pdf | Datasheet | English | 504KB |
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honeywell-sensing-vrs-sensors-thrumold-series-installation-instructions-32312331-a-en.pdf | Datasheet | English | 317KB |
TM-LDADA highres photo.jpg | Photo | -- | 612KB |
TM-LDADA lowres photo.jpg | Photo | -- | 79KB |
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 |