Speed Sensors & Tachometers – Precision Measurement of Rotational Speed

FAQ about Speed Sensors & Tachometers

Answers to common questions about choice, operation, installation, and applications.

What does a speed sensor measure?

A speed sensor detects the rotational speed of an object such as a shaft, gear or wheel and converts it into an electrical signal (e.g., Hz, pulses per second, or rpm). :contentReference[oaicite:2]{index=2}

Which measurement principles are used for speed sensors?

Common methods include: – Inductive sensors (detect metal teeth or ferromagnetic structures) :contentReference[oaicite:3]{index=3} – Hall-effect sensors (detect magnetic field changes) :contentReference[oaicite:4]{index=4} – Optical or laser sensors (detect marks, holes or reflections) :contentReference[oaicite:5]{index=5} – Eddy-current sensors for non-ferromagnetic targets :contentReference[oaicite:6]{index=6}

What are typical applications for speed sensors?

They are used in drive systems, motors, turbines, gearboxes, conveyors, wind turbines, automotive systems, and general machine monitoring for speed control, over-speed protection or condition monitoring. :contentReference[oaicite:7]{index=7}

What factors should I consider when selecting a speed sensor?

Important considerations include: maximum rotational speed, shaft diameter or target geometry, type of output signal (pulse, analog, frequency), environmental conditions (temperature, vibration, dust, moisture), mounting distance and target material. Also decide whether direction of rotation must be detected. :contentReference[oaicite:8]{index=8}

How is the installation and mounting handled?

The sensor must be positioned such that it can reliably detect the rotating target (teeth, holes, magnet, reflective mark). The mounting surface should be stable, and mechanical clearance or air-gap specification must be respected to avoid measurement errors. The electrical cabling and shielding must be correct for reliable signal transmission. :contentReference[oaicite:9]{index=9}

What output signals can be expected?

Outputs may include frequency or pulse signals, analog voltage or current, direction indication, USB or digital interfaces for data logging, or combinations thereof. Many tachometers also provide counting, averaging and event-tracking functions. :contentReference[oaicite:10]{index=10}

How do I detect warnings or faults with speed sensors?

By using features such as threshold alarms (over-speed / under-speed), event counts (e.g., missing pulses), direction reversal detection and status outputs. Many systems integrate with PLCs or SCADA for automatic response.

What environment or mounting concerns exist?

In harsh industrial settings sensors must handle high temperatures, strong vibrations, EMI/EMC exposure, dirt, moisture and sometimes explosive atmospheres. Choose models accordingly with suitable protection class and certification. :contentReference[oaicite:11]{index=11}

What are common sources of error in speed measurement?

• Insufficient target contrast or inappropriate target geometry
• Inaccurate air-gap or misalignment between sensor and target
• Signal noise due to poor shielding or long cables
• Vibration or thermal drift affecting measurement

How to integrate into automation systems?

Connect the sensor output (pulse, analog or digital) to a PLC, counter, data logger or controller. Ensure proper signal conditioning if needed, set parameters (e.g., pulses per revolution), and calibrate the system for accurate rpm conversion and monitoring.

Where can I request a quotation or more information?

Please contact ICS Schneider Messtechnik with your required speed range (rpm or Hz), target geometry, environmental conditions, required output signal and any additional features (direction detection, event count, data logging). They can assist with the proper selection and quotation. :contentReference[oaicite:12]{index=12}