Introduction
The component with part number 16710-45 is a Magnetic Speed Sensor, also known as a Magnetic Pickup (MPU) or Variable Reluctance Sensor. This device is a passive transducer that generates an AC voltage signal in the presence of a changing magnetic field.
It operates by using a permanent magnet and a coiled wire. When a ferromagnetic target (such as a gear tooth) passes the tip of the sensor, it changes the magnetic flux through the coil, inducing an AC voltage. The frequency of this AC signal is directly proportional to the rotational speed of the target. This simple, robust, and self-powered design makes it a widely used solution for speed sensing in industrial environments.
Parameters
The following table outlines the key technical parameters for a typical 16710-45 Magnetic Speed Sensor.
| Parameter | Specification |
|---|---|
| Part Number | 16710-45 |
| Description | Magnetic Speed Sensor (Magnetic Pickup) |
| Operating Principle | Variable Reluctance (Passive, self-generating) |
| Output Signal | AC Voltage (sine wave), amplitude and frequency dependent on speed and gap. |
| Typical Output | Can range from a few millivolts to over 50 VAC, increasing with speed. |
| Power Requirement | None (Passive Device) |
| Thread Size | Typically 1/2"-20 UNF or M16 x 1.0 (specific to model) |
| Probe Diameter | Approx. 16 mm (0.63 in) for body |
| Operating Temperature | -20°C to 120°C (-4°F to 248°F) or similar |
| Target Material | Ferromagnetic (e.g., iron, steel) |
| Recommended Air Gap | Typically 0.25 to 1.5 mm (0.010 to 0.060 in) from the gear tooth |
| Length (Overall) | Varies by model; typically 80-150 mm (3.1 - 5.9 in) |
| Weight (Approx.) | 0.2 - 0.4 kg (0.44 - 0.88 lb) |
Application Scenarios
The 16710-45 Magnetic Speed Sensor is a fundamental component for speed measurement and overspeed protection across a wide range of industries. Key application scenarios include:
Turbine and Compressor Overspeed Protection:
A primary application is on steam turbines, gas turbines, and compressors. It provides the speed input to a dedicated overspeed protection system (like a Bently Nevada 3500/60 Speed Monitor) to initiate an emergency shutdown if a dangerous overspeed condition is detected.
Rotational Speed (RPM) Measurement:
Used for general-purpose speed monitoring on motors, pumps, fans, and gearboxes. The frequency of the output signal is directly counted or measured to display RPM.
Zero Speed Detection:
Used to confirm that a machine has come to a complete stop, which is a critical safety interlock for maintenance or for sequencing lubrication systems that should only run while the machine is rotating.
Tachometer Reference for Control Systems:
Provides a once-per-revolution or multiple-pulses-per-revolution signal that serves as a speed feedback for control systems, enabling precise speed regulation.
Engine and Transmission Monitoring:
Commonly used on diesel engines, reciprocating compressors, and vehicle transmissions to monitor crankshaft or output shaft speed.
Typical Machinery Monitored:
Steam Turbines & Gas Turbines
Centrifugal Compressors
Large Electric Motors
Diesel Engines
Pumps and Fans
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