Product Description
The STONEL QN35A05HDM QN45CK02HDM QN45CR02HRA series delivers a versatile range of heavy duty industrial position switches engineered for reliable valve status feedback in hazardous and corrosive environments. STONEL, a trusted manufacturer of valve automation accessories, has designed these three models to address demanding applications including offshore platforms, chemical processing units, pipeline isolation valves, and high integrity emergency shutdown systems. Each model shares a common foundation of robust die cast aluminum construction with flameproof certification, while offering unique features to match specific installation requirements.

The STONEL QN35A05HDM is a high capacity mechanical limit switch box featuring five independent microswitches within a compact flameproof enclosure. This model provides up to five SPDT contact outputs, allowing operators to monitor fully open, fully closed, two intermediate positions, and a separate alarm or interlock contact from a single valve. Each switch is rated at 10A 250V AC with silver alloy contacts for reliable low resistance switching. The enclosure carries ATEX II 2 G Ex db IIC T6 certification for Zone 1 and Zone 2 gas groups, with IP66 IP67 ingress protection. Five independently adjustable cam lobes allow individual setpoint tuning over 0 to 120 degrees of rotation. An external visual position indicator with high visibility colors confirms valve status from any angle. The STONEL QN35A05HDM is ideal for complex valve sequencing, partial stroke testing, and safety instrumented functions requiring multiple redundant feedback channels.

The STONEL QN45CK02HDM is a flameproof limit switch box pre wired with a 2 meter long heavy duty cable instead of traditional cable entries. This configuration simplifies installation by eliminating the need for field wiring of conduit or glands, reducing labour costs and potential moisture ingress points. The integral cable is rated for oil resistant, flame retardant, and UV stabilized applications, with 12 color coded conductors terminated inside the enclosure. Two mechanically independent microswitches provide SPDT contacts rated at 6A 250V AC. The STONEL QN45CK02HDM enclosure maintains full ATEX Ex db IIC T6 certification and IP66 protection, with all cable entry points factory sealed. This model is particularly suited for offshore modules, chemical skids, and prefabricated valve packages where quick plug and play connection to junction boxes is required.

For installations requiring corrosion resistant materials beyond standard coated aluminum, the STONEL QN45CR02HRA features a stainless steel enclosure and hardware. The housing is constructed from 316L stainless steel with an electro polished finish, offering exceptional resistance to salt spray, acidic atmospheres, and chemical washdowns. Two high reliability microswitches rated at 5A 250V AC are housed inside, with hermetically sealed terminals to prevent wicking of corrosive fluids. The STONEL QN45CR02HRA carries ATEX II 2 G Ex db IIC T6 as well as IP68 rating for continuous immersion up to 5 meters depth. An external position indicator uses chemically inert glass reinforced plastic components. This model is the preferred choice for marine environments, chlorine production plants, fertilizer terminals, and offshore drilling rigs where standard aluminum enclosures would deteriorate rapidly.

All three STONEL position switches feature NAMUR VDI VDE 3845 mounting interfaces for direct attachment to quarter turn pneumatic and electric actuators. The cam mechanism is externally adjustable without cover removal, and each unit undergoes full functional testing before shipment. Operating temperature ranges from minus 40 degrees Celsius to plus 80 degrees Celsius, with optional low temperature or high temperature grease available. For plant engineers managing critical valve assets in harsh zones, the STONEL QN35A05HDM QN45CK02HDM QN45CR02HRA series provides flameproof safety, multiple contact options, cable ready convenience, and stainless steel corrosion resistance. Select the STONEL model that matches your environmental and signal count requirements for decades of dependable position feedback.