The STONEL QG2VP05HDM QN2NK02SDM QN33A05HDM series represents a complete family of heavy duty position switches engineered for reliable valve status feedback across all industrial applications. STONEL, a recognized leader in valve automation accessories, offers three distinct models to solve every installation requirement from compact pneumatic actuation to high integrity safety systems and non contact sensing in explosive atmospheres. Whether your facility operates in chemical processing, oil and gas terminals, power generation, water treatment, or pharmaceutical manufacturing, this STONEL position switch series delivers certified performance, rugged construction, and long service life.

The STONEL QG2VP05HDM is a compact mechanical limit switch box designed for direct NAMUR mounting on pneumatic quarter turn actuators where space is limited. Its low profile glass reinforced polyester enclosure measures only 65mm in height, making it ideal for skid mounted equipment and analyser shelters. Two pre wired SPDT microswitches rated at 5A 250V AC provide reliable open close signaling, while the external adjustable cam allows stroke setting without removing the cover. An IP67 rating ensures protection against dust and temporary immersion, and the bright red green visual indicator confirms valve position from a distance. Operating from minus 25 to plus 85 degrees Celsius, the STONEL QG2VP05HDM is the perfect choice for indoor and sheltered outdoor installations requiring a compact footprint.

For hazardous areas demanding non contact sensing, the STONEL QN2NK02SDM offers an intrinsically safe inductive proximity switch with ATEX II 1 G Ex ia IIC T6 Ga certification for Zone 0, Zone 1, and Zone 2 environments. This model eliminates mechanical wear by detecting metallic actuator targets from up to 5mm distance, providing unlimited cycle life for high frequency applications such as batch reactors and compressor shutdown valves. The stainless steel M18 threaded body is fully potted to IP68 for continuous immersion, and the two wire DC output operates through standard intrinsic safety barriers. An integral LED provides local target indication, and the wide temperature range from minus 40 to plus 100 degrees Celsius supports cryogenic and high temperature service. Choose the STONEL QN2NK02SDM where non contact reliability and intrinsic safety are mandatory.

When triple redundancy or multiple independent signals are required for critical valve monitoring, the STONEL QN33A05HDM delivers three heavy duty mechanical microswitches in a flameproof aluminum enclosure. Each SPDT switch is rated at 10A 250V AC with silver cadmium oxide contacts for superior arc quenching, and three independent cam lobes allow separate setpoint adjustment over 0 to 120 degrees of rotation. This enables simultaneous outputs for valve open, valve closed, and an intermediate position alarm or partial stroke test feedback. The die cast aluminum housing carries ATEX II 2 G Ex db IIC T6 certification for Zone 1 and Zone 2 gas groups, with IP66 IP67 ingress protection. Two M20 cable entries and an external visual dome indicator complete the package. The STONEL QN33A05HDM is the industry standard for emergency shutdown valves and high integrity pressure protection systems.

All three STONEL position switches share common benefits including corrosion resistant materials, wide ambient temperature operation, and straightforward installation on any quarter turn actuator with NAMUR or ISO 5211 interfaces. The series is backed by STONEL global technical support and carries full IECEx, ATEX, and optional SIL certification documentation. For plant engineers seeking a single source for all valve position feedback needs, the STONEL QG2VP05HDM QN2NK02SDM QN33A05HDM series offers the right solution for every application from general purpose to intrinsically safe non contact and triple redundant heavy duty monitoring. Upgrade your valve automation reliability with the proven performance of STONEL position switches.