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Highly Accurate and Rugged Speed Sensors

Dynalco Magnetic Pickups with CSA & ATEX Approvals for use in industrial applications

Dynalco magnetic pickups convert mechanical motion to ac voltage without mechanical linkage or external power. These self-contained transducers produce a magnetic field which, when altered by a moving ferrous object, generates an ac voltage. It assumes a material that is attracted to a magnet, such as the pole piece of a magnetic pickup.

When the pickup is mounted in proximity to the teeth of a gear on a rotating shaft, the generated voltage has a frequency in direct proportion to RPM. Although a gear is preferable, a proper signal may be derived from evenly spaced screws, holes, or flats on a rotating ferrous shaft, or by using Dynalco’s exclusive TT-100 Tach Tape, especially designed for smooth ferrous or nonferrous shafts.

 

Product Family

Magnetic Pickup M321
Passive (Variable Reluctance)- Hazardous Area Speed Sensor
Multiple Thread Sizes and Lengths, High Sensitivity (min. Speed>300 RPM)
This magnetic pickup sensor is ATEX and IECEx approved for use in hazardous areas: Ex mb (Zone 1, 2) and Ex ia (Zone 0, 1, 2). It is a sensitive pickup suitable for mid-speed applications (300 to 500 minimum…
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Frequently Asked Questions

Find answers to common questions below

A1: A magnetic pickup is a non-contact speed sensor that measures rotational speed using electromagnetic induction. Inside the sensor is a magnet and coil. As gear teeth or other ferrous targets pass the sensor tip, they disturb the magnetic field, generating an AC voltage signal. The frequency of these pulses corresponds to the shaft’s RPM, which can be used for monitoring or control.
A2: Magnetic pickups are commonly found in: • Diesel and gas engines for RPM measurement • Turbines and compressors for speed monitoring • Industrial generators and pumps • Oil & gas and marine systems for overspeed protection and shutdown Integrated with Dynalco tachometers, speed switches, and digital governors for precise engine control and safety Download our magnetic pickup selection guide below:
https://www.barksdale.com/sites/default/files/literature/documents/Dynalco-Magnetic-Pickup-Speed-Sensors-D0601-A-08-24.pdf
A3: Dynalco magnetic pickups and tachometers form a complete speed monitoring system: Magnetic Pickup: Installed near a gear or flywheel, it generates an AC voltage signal as gear teeth pass its magnetic field. The frequency of this signal corresponds to engine or shaft RPM. Tachometer: Receives the signal from the magnetic pickup and converts it into a readable RPM display. It can also provide outputs for alarms, relays, or data logging. Key Benefits of Dynalco’s Pairing: Self-powered sensing: Magnetic pickups do not require external power—they create their own signals Dynalco’s SPD100, SPH-100, and MTH103E can all be powered solely from the magnetic pickup’s signal, without the need for an external power source High accuracy: Tachometers interpret the frequency precisely for real-time speed monitoring. Safety integration: Tachometers can trigger overspeed alarms or shutdowns based on pickup input. See Dynalco’s product offering below:
https://www.barksdale.com/products/dynalco/speed
A4: A speed switch monitors the rotational speed of machinery and triggers alarms or shutdowns when speed exceeds or drops below safe limits. This prevents catastrophic failures in engines, pumps, and turbines.
Dynalco’s SST7000 Series offers Class I Div II approvals, with precise overspeed and underspeed protection with up to 4 programmable relay setpoints, ensuring safety and compliance in critical applications.
A5: You can contact Barksdale for inquiries through the 'Contact' option available on their website.