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Test & measurement


In measuring strain, engineers often feel like they are stuck between a rock and a hard place when it comes to wireless data acquisition, with wired setups adding complexity and some fully-fledged cloud setups being time or cost prohibitive. Here, Matt Nicholas, product design manager at sensor and signal conditioning specialist Mantracourt, explains how the company’s recent B24 Bluetooth strain transmitter offers a good balance between wireless functionality and cost.


forces such as tension and compression, or in other sensors using Wheatstone bridge circuits, such as pressure or torque transducers. Before wireless technologies became


S


popular, any time an engineer needed to take a load cell reading, they would - and many still do - rely on a physical connection to the load cell. This would require the operator to directly plug in their hand terminal to the load cell to take a reading, or use a human machine interface (HMI) to display the data from multiple sensors. This setup is fine if you are measuring


the reading from a single load cell, but add a few units and the complexity begins to add up. The cabling and installation costs of wiring such a system can often end up being more than the load-cells themselves, and it takes time before you can get up and running.


train bridge measurement is found in a wide range of industrial sensors, typically load cells, to measure


Not only does this require the


engineer to get up close to the application to take the reading - potentially putting them at risk of injury - they also need to use a dedicated, often proprietary, terminal along with all the cost and programming associated with that. The options for wireless transmission


are varied, from low power devices that use the 2.4 GHz transmission format, which are able to transmit on multiple channels and are remarkably tolerant of radio frequency interference, to devices that use mesh or star network topologies. These networks are more sophisticated, self-healing and work at greater range than their non-mesh counterparts - but this is at the expense of being power hungry, lower resolution and more complex to configure.


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June 2021 Instrumentation Monthly


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