Product Description
The STONEL QNTRK03SDM QX2GCR03HRA QX2GK03HDM series comprises three advanced valve position switches engineered to meet the full spectrum of industrial feedback requirements, from SIL certified safety loops to compact pneumatic actuators and corrosive marine environments. STONEL has developed these models with distinct design philosophies while maintaining a common commitment to reliability, explosion proof safety, and long service life. Whether your facility operates in petrochemical refining, offshore oil production, pharmaceutical manufacturing, or power generation, this STONEL position switch series offers a tailored solution without compromising on quality or certification.

The STONEL QNTRK03SDM is a SIL capable flameproof limit switch box featuring triple independent microswitches with full traceability and documented performance per IEC 61508. This model is specifically designed for safety instrumented systems where verifiable reliability is mandatory. Each of the three SPDT switches is rated at 6A 250V AC and undergoes individual contact resistance testing. The enclosure is precision die cast aluminum with a tough epoxy coating, rated IP66 and IP67, and carries ATEX II 2 G Ex db IIC T6 and IECEx certification. A unique feature of the STONEL QNTRK03SDM is the integrated terminal board with clearly numbered positions, plus an external screwdriver adjustable cam system that allows setpoint changes without exposing the flameproof chamber. An auxiliary visual indicator with highly reflective colors provides immediate local status. Operating temperature spans -40°C to +85°C. For any emergency shutdown valve, high integrity pressure protection system, or burner management application demanding SIL 2 or SIL 3 capability, the STONEL QNTRK03SDM delivers certified safety and proven performance.

The STONEL QX2GCR03HRA is a compact yet heavy duty stainless steel limit switch box designed for extreme corrosion resistance in a space saving footprint. Constructed entirely from 316L stainless steel with an electro polished finish, this model withstands continuous salt spray, acidic fumes, and high humidity found on offshore platforms, marine loading arms, and chemical storage terminals. Despite its reduced overall height of only 80 millimeters, the STONEL QX2GCR03HRA houses three mechanical microswitches rated at 5A 250V AC, each with gold plated contacts for reliable low energy switching. The enclosure is rated IP68 for prolonged submersion, and the welded construction eliminates gasket degradation issues common with assembled enclosures. External cam adjustment is provided through a sealed hex socket, and two M20 stainless steel cable entries are included. An O ring sealed polycarbonate visual indicator dome remains readable even after years of UV exposure. For maintenance engineers responsible for valves in aggressive environments where standard aluminum boxes fail within months, the STONEL QX2GCR03HRA offers permanent corrosion protection.

The STONEL QX2GK03HDM is a compact pneumatic valve position switch designed for direct attachment to small bore quarter turn actuators where footprint and weight are critical. This model features a glass reinforced polymer enclosure that is both impact resistant and chemically stable, rated IP67 for dust tight and temporary immersion protection. Two pre wired microswitches provide SPDT contacts at 5A 250V AC, with a third optional switch available for three contact configurations. The STONEL QX2GK03HDM uses a simplified cam mechanism with factory set 90 degree stroke, field adjustable from 30 to 120 degrees via external tool. The overall weight is only 0.4 kilograms, making it suitable for mounting on miniature pneumatic actuators without overloading the valve stem. An integrated visual indicator with bright yellow and black contrast provides clear open close status. Operating temperature ranges from -20°C to +80°C. This STONEL model is ideal for skid mounted instrumentation, analyser shelters, dust collector valves, and any application requiring reliable position feedback where space and weight are at a premium.

All three STONEL switches share NAMUR VDI VDE 3845 mounting compatibility with standard drive shaft adaptors for 9mm, 11mm, and 14mm square or double D connections. Each unit is 100 percent functionally tested before leaving the factory, and full certification documentation including ATEX, IECEx, and SIL (where applicable) is provided. The series supports a wide supply of accessories including mounting brackets for non standard actuators and conduit adaptors for global electrical codes. For plant operators seeking a single source for compact, corrosive duty, and SIL rated position feedback, the STONEL QNTRK03SDM QX2GCR03HRA QX2GK03HDM series delivers application engineered solutions backed by STONEL decades of automation experience. Upgrade your valve monitoring reliability with the precision and durability of STONEL position switches.