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Torque Sensor With Separate Sensing Head Can Probe Deep Into Machinery

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Sensor Technology has extended its new range of torque sensors with a model that has the sensing head and electronics in separate housings. This has two advantages: the sensing head can fit into very confined spaces, and the electronics can be located in a position where they are protected from physical damage, dust, dirt, moisture, electromagnetic forces, etc.

The new TorqSense SGR530/540 series operates on the same principle as all the other SGR510/520 units, namely a full four element strain gauge bridge. This uses four individual stain gauges affixed to the drive shaft; each measures the deflection of the shaft in a different direction as it rotates under load. The electronics collects readings from all four gauges and calculates the torque value.

Sensor Technology launched the TorqSense SGR510/520 range in 2020 as the successor to its RWT range which worked on surface acoustic wave (SAW) measurement and detection. It has specialised in real-time torque measurement for over forty years, and pioneered the development of wireless technologies that use radio frequency pickups rather than hard-wired solutions involving delicate and unreliable slip rings.

Initially launched in sizes up to 500Nm, interest in the SGR sensors was so high that the introduction of larger sizes up to 13,000Nm was brought forward 6-12 months to December 2020.

"Because of our experience with the RWT, we have been able to compress the development times for the new SGR models considerably,” says Sensor Technology's Mark Ingham. “So, we have been able to react to specific enquiries from individual users and bring forward model launches. "

The new range is designed to meet emerging user requirements, notably accurately recording transient torque spikes. In the past transducers didn't have the bandwidth to capture these spikes, so they were ignored. However, advances in automation, continuous operation and the increasing need for accurate track and trace data has led to the need for more detailed measurement and analysis, as Mark explains:

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