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Q: Are there differences between sensor technologies?
- Jun 17, 2018 -

A: It’s important to note not all magnet sensor solutions are the same. Many solutions rely on a physical connection to the actuator stem via a coupler or lever arm. This traditional linkage connection has the potential to drive down the overall cost of maintenance as well as provide a simpler retrofit solution versus the spare parts/assemblies needed for each “linkage- less” style valve positioner. Additionally, there are defined advantages to newer sensor technologies. The Hall Effect sensor is popular within the valve industry. However, compared to newer technology, like GMR sensors, it has a much lower signal-to-noise ratio. GMR technology has a high signal-tonoise ratio, meaning it is uniquely suited for these types of valve control applications. GMR sensors have high resolution/ sensitivity and temperature stability while having a small footprint and lower power consumption.

The noncontact position detection feature as well as the remote detection feature address the extreme vibration applications where we see a negative effect on positioner control and its potentiometer. The NCS allows the valve assembly to continue to experience the high vibration that is sometimes unavoidable while maintaining the high resolution and precise control that is desired.