LVDT Linear Position Sensor operates in hazardous locations.

Press Release Summary:

Constructed of stainless steel and rated to 212°F, intrinsically safe HLR series is UL-/ULC-listed for hazardous locations Class I, Division 1, Groups A/B/C/D and Class I, Zone 2. Contactless position measurement accommodates critical applications in hostile environments of gas/steam turbine plants, chemical process plants, and paper mills. Offering measurement ranges from ±1 to ±10 in. FS, series delivers repeatability better than 0.01% FS typ and non-linearity of less than 0.25% FRO.

Original Press Release:

Intrinsically Safe LVDT Linear Position Sensors Approved to Operate in Hazardous Locations

Upgraded HLR Series LVDTs Operate in Critical Applications for Gas/Steam Power Plants, Chemical Process Plants, Paper Mills, Gas Pumping Stations, Refinery Ops

Pennsauken, NJ - Macro Sensors ( offers an upgraded series of intrinsically safe LVDT Linear Position Sensors for use in hostile environments such as gas/ steam turbine plants, chemical process plants and paper mills. Rated for operation to 212°F (100°C), the HLR sensors are now UL/ULC listed for hazardous locations Class I, Division 1, Groups A, B, C, D and Class I, Zone 2 by Underwriters Laboratories.

Constructed entirely of stainless steel for environmental robustness, the HLR Series LVDT Linear Position Sensors offer reliable and 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. Units are also ideal 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 LVDT cores accessible from both ends for better mechanical support and core guidance and easy cleanout in dusty or dirty locations. Sensor lead wires exit through a radially mounted 1/2-14 NPT male threaded conduit fitting for easy attachment to an explosion-proof junction box as well as rigid or flexible conduit. For added protection against environmental elements, electronics can be installed in explosion-proof enclosures and connected to LVDTs using a suitable conduit.

Available in full-scale measurement ranges from ±1 inch to ±10 inches, units feature excellent repeatability typically better than 0.01% of full scale and non-linearity of less than 0.25% FRO. For more information on the HLR 750 Series, refer to: or contact the factory at A catalog on Position Sensors for Power Generation is available at: .

About Macro Sensors
Macro Sensors' extensive line of linear and rotary sensors are used for position measurement and feedback in a variety of industrial applications including factory automation, motion control systems, metal fabricating, automotive assembly as well as power plants, gas/steam turbines. Incorporated in 1994, the Company offers more than 200 years of cumulative design and manufacturing experience by its key staff in serving its OEM and end-user international customer base. On June 1, 2005, Macro Sensors was acquired by AST, manufacturer of state-of-the-art (Micro Electro Mechanical Structures) MEMS-based pressure sensors, transducers, and transmitters. Common applications of AST sensor products are in industrial OEM, hydraulic systems, fuel cells, medical gases, HVAC/R, refrigeration, oil & gas exploration/production, and off-road vehicles. For more information on AST products and technology, visit the AST website at

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