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Overview
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.
Technical Specifications
| Output Voltage (Peak to Peak) Min. | 30 Vp-p to 48 Vp-p |
| Operating Frequency | 15 kHz typ. |
| Mounting Thread | 5/8-18 UNF-2A thread size |
| 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. | 30 Vp-p to 48 Vp-p |
| Operating Frequency | 15 kHz typ. |
| Mounting Thread | 5/8-18 UNF-2A thread size |
| 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 |
Documents
| TITLE | DOCUMENT TYPE | LANGUAGE | SIZE |
| 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 |
| TM-HBADA highres photo.jpg | Photo | -- | 506KB |
| TM-HBADA lowres photo.jpg | Photo | -- | 59KB |
| 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 |
Product Features
- Configurable diameters, materials, and output voltages: A variety of package styles, housing diameters, materials and and output voltages
- Compensated operating temperature range: -40 °C to 150 °C [-40 °F to 302 °F]
- Energy efficient: When used in engine camshaft and crankshaft applications, can provide a precise engine timing signal to optimize the combustion process
- No moving parts or wear mechanisms (unlike mechanical switches)
- Self-powered operation: Can be used in applications where no external power is available
- Direct conversion of actuator speed to output frequency: Simplifies the customer’s electronic control interface because each output signal correlates to each tooth on the actuator
- Simple installation: Screw-in mount sensor requires no special tools
- Designed for use over a wide range of speeds: Allows for potential use in engines and transmissions which often require a wide range of rotational speed measurement
- Durable: 300 Series stainless steel housing material allows for use in harsh environments
- Environmentally tough: - Chemical compatibility: Engine oil, diesel fuel, water, engine coolant, salt spray and trisodium phosphate cleaning solution (oils containing extreme pressure additives are not suitable for use with this sensor); front end sealed to 5 psi
- Sensor reach option (sensor reach is the distance from a sensor’s mounting surface to its sensing tip): Adjustable: The sensor, with its threaded housing, is screwed into the application until it makes contact with the target, and then is backed off one-half to one turn; a user-provided jam nut is then used to fix the sensor in place; Fixed (also called non-adjustable): The sensor is screwed into the application until the sensor’s mounting surface makes contact with the application’s mounting surface /ul>
Applications
- Engine timing for heavy duty, off-road, construction vehicles (i.e., tractors and dump trucks)
- Transmission speed for heavy duty, off-road, construction vehicles (i.e., tractors and dump trucks)
Note: Not recommended for potential use in Aerospace/Defense applications.