FGDH-4A Frictional Torque Sensor System

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Key features

• No strain gauges on the drive shaft
• Clamp-on installation
• Wireless digital telemetry (2.4 GHz)
• Long operating time – up to 10 hours
• Switchable measuring ranges
• USB rechargeable without removing the sensor
• No calibration required
• Multiple shaft diameter options – Ø20–30 mm, Ø30–40 mm, Ø40–50 mm

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About the FGDH-4A Frictional Torque Sensor System

The FGDH-4A is a friction-type torque sensor system designed to measure torque generated on rotating shafts and transmit the data digitally and wirelessly to a dedicated receiver. Unlike conventional solutions that require strain gauges to be bonded to the drive shaft, the FGDH-4A enables one-touch measurement, drastically reducing installation effort and preparation time.

Key benefits

• No strain-gauge installation on the shaft: saves time and eliminates bonding/wiring work
• Fast, simple mounting: clamp onto the shaft and secure with screws
• Wireless digital telemetry (2.4 GHz): long transmission distance and easy antenna setup
• Noise-resistant signal: digital transmitter/receiver system, no cabling required
• Longer operating time: approx. 10 hours (vs. conventional FGDH-3A approx. 6 hours)
• High dynamic response: 1 kHz response frequency
• No calibration required: ready to use quickly
• USB rechargeable: recharge via USB power cable without removing the sensor
• Built-in sleep function: reduces battery drain for extended runtime

Measuring ranges

Switchable between three ranges: ±3200 / ±6400 / ±16000 × 10⁻⁶ strain. This wide range supports measurements from small to large torque amplitudes.

Shaft diameter options

Available for the following shaft diameter ranges (depending on version):

• Ø 20–30 mm
• Ø 30–40 mm
• Ø 40–50 mm

How it works: friction-type sensing

Traditional strain-gauge torque measurement requires surface preparation, bonding, curing, and lead wiring. The FGDH-4A uses friction-type gauges, so no gluing is needed. The sensor is integrated into the clamp-on unit, making installation quick and repeatable.

Digital telemetry for reliable measurements

The integrated digital transmitter/receiver system provides robust, noise-resistant data transmission and simplifies setup by eliminating wiring. High-speed processing also reduces telemetry delay significantly compared to conventional systems.

Regulatory compliance (2.4 GHz)

Compliant with radio regulations in Japan, the European Union (EU), the United States, Canada, China, India, Australia, and the Republic of Korea.

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