The STONEL QX2VCK03HDM QX2VCK05HDM QX2VCR02HRA series represents a specialized family of compact pre wired limit switch boxes designed for valve position feedback in space constrained and high density installations. STONEL, a leading brand in industrial automation accessories, has engineered these models to eliminate the need for field wiring of cable entries while offering three different contact configurations and material options. This series is ideally suited for modular process skids, offshore topside modules, analyser shelters, hygienic filling machines, and any application where reliable open close indication must be delivered through a factory sealed cable connection.

The STONEL QX2VCK03HDM is a pre wired compact limit switch box featuring three independent mechanical microswitches within a low profile glass reinforced polymer enclosure. A two meter long heavy duty oil resistant cable exits the enclosure through a factory molded strain relief, completely eliminating the need for conduit, glands, or cover opening during installation. The cable contains seven color coded conductors providing individual connections for common, normally open, and normally closed contacts for each of the three switches. Each microswitch is rated at 5A 250V AC with silver gold plated contacts for reliable low energy switching. The STONEL QX2VCK03HDM includes externally adjustable cams for stroke setting from 30 to 120 degrees, a bright red green visual position indicator, and IP67 environmental protection. Operating temperature ranges from -25°C to +85°C. This model is the perfect choice for triple feedback signals such as valve open, valve closed, and a mid stroke or seat wear alarm.

For applications requiring even more feedback channels, the STONEL QX2VCK05HDM offers an impressive five independent microswitches within the same compact footprint. This high density configuration provides five SPDT contact outputs, enabling monitoring of fully open, fully closed, three intermediate positions, or a combination of PLC discrete inputs and separate safety interlock signals. The two meter pre wired cable contains 12 conductors, each color coded and numbered for error free termination. The STONEL QX2VCK05HDM retains the same polymer enclosure, IP67 rating, external cam adjustment, and visual indicator as the 03 model. Each of the five switches is rated at 3A 250V AC due to the reduced internal space, but this is sufficient for most PLC and relay input cards. This STONEL model is ideal for complex valve sequencing, partial stroke testing with multiple position verification, and valve diagnostics where additional contact points are required.

When corrosion resistance is paramount, the STONEL QX2VCR02HRA delivers a pre wired compact limit switch built entirely from 316L stainless steel. This model houses two high reliability microswitches rated at 5A 250V AC, with gold plated contacts for low energy circuits. The two meter cable is also rated for harsh chemical and marine environments, featuring a halogen free sheath and fully potted entry. The STONEL QX2VCR02HRA enclosure is welded and electropolished, achieving IP68 protection for continuous immersion and resistance to salt spray, acidic vapours, and washdown chemicals. Despite the stainless steel construction, the overall size remains compact, allowing mounting on small actuators. An external visual indicator with a chemically inert polycarbonate dome provides clear status. This STONEL model is the definitive solution for offshore platforms, marine engine rooms, wastewater treatment plants, and chemical dosing stations where standard polymer or aluminum units would quickly corrode.

All three STONEL pre wired limit switches share the same NAMUR VDI VDE 3845 mounting interface with a 30mm drive shaft and adapters for 9mm and 11mm square actuator stems. The pre wired cable design significantly reduces installation labour and eliminates potential ingress points through improperly sealed conduit entries. Each unit is 100 percent function tested at the factory, and the cable length can be customized to 5 or 10 meters upon request. For plant engineers seeking a clean, reliable, and application matched position feedback solution, the STONEL QX2VCK03HDM QX2VCK05HDM QX2VCR02HRA series offers contact density options, corrosion resistant stainless steel, and the simplicity of pre wired connectivity. Trust STONEL to deliver compact limit switching that performs in the toughest environments.