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Tachometer Sensors(Optical Sensors, Proximity Sensors, Infrared Sensors, Magnetic Sensors)
Tachometers and Speed Transmitters require a permanently mounted speed sensors that observe a target on the machines rotating shaft. Several types of sensors are available including Proximity, Hall Effect (magnetic), Optical and Laser. Permanently mounted systems usually use a Proximity or Hall Effect type sensor. Laser and Optical Sensors are more suited for portable equipment and special applications. Optical Sensors work well with “Reflective Tape” as a target on the shaft but are not recommended for permanent installation as the sensor may become dirty over time or the tape may come loose.
To create the “speed pulse” required by the Tachometer to calculate RPM either a Proximity or Hall Effect Sensor is mounted to observe a Keyway or Speed Gear Wheel mounted on the machines rotating shaft. While Keyways generally create a once per turn pulse speed gears may produce 10, 30, 60 or 100 pulses (teeth) per revolution. For highly accurate and low speed readings a Speed Gear with multiple pulses per revolution is preferred. For balancing a “once per turn” pulse is preferred.
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