Macro Sensors has offered an upgraded series of intrinsically safe LVDT (linear variable differential transformer) linear position sensors for use in hostile environments such as gas and steam turbine plants, chemical process plants and paper mills. The High Low Relay sensors are Underwriters Laboratories and Underwriters Laboratories Canada listed for hazardous locations and operate at 100°C.
Constructed entirely of stainless steel for environmental robustness, the sensors offer contactless position measurement for critical applications in power plants using gas turbines such as fuel valve position feedback, vane pitch servo controls, governor controls and generator shell expansion. The sensors are also suitable for throttle position sensing in natural gas pumping stations, height measurement for head boxes and slicers in paper mills and real-time position sensing for all types of valves in chemical process plants.
A through-bore design makes the sensor cores accessible from both ends for good mechanical support and core guidance and easy cleanout in dusty or dirty locations. Sensor lead wires exit through a radially mounted 0.5 to14 national pipe thread male threaded conduit fitting for easy attachment to an explosion-proof junction box as well as rigid conduit, claims the company. For added protection against environmental elements, electronics can be installed in explosion-proof enclosures and connected to sensors using a suitable conduit.
Available in full-scale measurement ranges from ±1 to ±10inch, sensors feature good repeatability typically better than 0.01% of full scale and non-linearity of less than 0.25%.
