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ITS-300-L
KST&OEM&ODM Brand
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The ITS300 Flameproof Limit Switch Box is a valve position feedback device designed for direct installation on pneumatic quarter-turn rotary actuators. It mounts to the actuator stem using a NAMUR-standard interface and monitors shaft rotation to generate electrical output signals confirming that the valve has reached the fully open or fully closed position.
This signal transmits to a DCS, PLC, or SCADA control system in real time, allowing remote operators to verify valve state without physical inspection at the field location. In automated pipeline systems, continuous position feedback supports process safety interlocks, emergency shutdown sequences, and audit trail documentation requirements.
The ITS300 carries an Ex d IIC T6 flameproof explosion-proof rating and an IP66 ingress protection classification. These ratings qualify it for installation in ATEX Zone 1, Zone 2, and IEC Ex equivalent hazardous area classifications. The operating temperature range of -25°C to +80°C covers outdoor, arctic, and elevated-ambient process environments.
KONTE is a professional ITS300 flameproof limit switch box manufacturer, supplier, and exporter backed by Kangsaite Automation Group (KST), with 30+ years of manufacturing experience and active ATEX certification for pneumatic actuator accessories.
| Item | Specification |
|---|---|
| Mechanical Switch | 2 × SPDT (Double-throw double-break) |
| Sensing Switch (Domestic) | SFB2-V3-Y Intrinsically Safe (8V) |
| P&F Sensing Switch | NJ2-V3-N Intrinsically Safe (8V) |
| P&F Sensing Switch | NBB3-V3-Z4 (24V) |
| Sensing Switch (Domestic) | SBB2-V3-DA (24V) |
| Magnetic Sensing Switch (Domestic) | SBB3-V3-DA-CX |
| IP Rating | IP66 |
| Explosion-Proof Rating | Ex d IIC T6 |
| Operating Ambient Temperature | -25°C to +80°C |
| Cable Connection | 2×NPT 1/2, 2×NPT 3/4, M20×1.5, G1/2, G3/4 |
The ITS300 supports three switch technology types. Selecting the correct configuration depends on the site's hazardous area classification, control system supply voltage, and required operating cycle frequency.
Mechanical Switch — 2×SPDT
Two independent single-pole double-throw contacts actuate through direct mechanical contact with the internal cam driven by the actuator shaft. Each contact provides one normally open and one normally closed output circuit. This configuration requires no external supply to the switch element and is the standard selection for basic on/off interlock circuits and emergency shutdown duty. Contact rating: 5A at 250VAC (standard), with Omron and Honeywell-grade contacts available for higher switching capacity.
Proximity Sensing Switch — Pepperl+Fuchs
Two P&F proximity switch models are available: the NJ2-V3-N for intrinsically safe 8V circuits, and the NBB3-V3-Z4 for 24V standard supply. Proximity switches detect cam position without physical contact, eliminating mechanical wear over high-cycle operation. This type is selected for automated systems with frequent switching requirements where extended service intervals are needed.
Intrinsically Safe Sensing Switch — Domestic
The SFB2-V3-Y (8V) and SBB2-V3-DA (24V) domestic-specification sensing switches provide intrinsically safe circuit compatibility for ATEX Zone 0 and Zone 1 classified areas. The SBB3-V3-DA-CX model adds magnetic sensing capability for installations where cam-type mechanical drive is not practical. Intrinsically safe designs limit electrical energy in the switch circuit to below ignition thresholds at the switch element itself.
All switch types share the same ITS300 housing, NAMUR mounting interface, and 8-point terminal strip. Switch type is specified at order placement or factory pre-assembled.
Understanding Ex d IIC T6 The ITS300 is classified under IEC 60079-1 for flameproof enclosure construction. The designation "Ex d" means the enclosure contains any internal ignition event and prevents flame propagation to the surrounding atmosphere through controlled flameproof joints. "IIC" is the highest gas group classification under IEC standards, covering hydrogen, acetylene, and carbon disulfide — gases with the lowest minimum ignition energy. "T6" limits the maximum external surface temperature to 85°C under all operating conditions, which falls below the auto-ignition temperature of every common industrial flammable gas.
This combination of group and temperature class makes the ITS300 applicable to the widest range of hazardous gas environments, including petrochemical, LNG, hydrogen, and solvent processing facilities.
IP66 Dust and Water Protection
The IP66 rating provides total protection against dust ingress and resistance to high-pressure water jets from any direction. The enclosure installs in outdoor locations, washdown zones, and environments with wind-driven rain without additional protective housing.
KONTE holds active ATEX certification for pneumatic actuator components.
The ITS300 body is die-cast aluminum alloy with polyester powder coating applied over the exterior. Die-casting produces the dimensional precision required for flameproof joint gap tolerances specified in IEC 60079-1. The coating provides corrosion resistance for outdoor and marine-adjacent installations.
A two-directional visual position indicator is built into the cover. The standard color code is red for the closed position and yellow (or green, selectable at order) for the open position. This allows field technicians to confirm valve state visually without electrical instruments.
The upper cover incorporates an anti-removal bolt that prevents the lid from completely separating from the body when loosened. This is a safety feature for maintenance access at height or in confined locations.
The 8-point terminal strip accepts conductors from 0.08 to 2.5 mm². Two cable entries are provided as standard, with options for up to four entries. Thread formats covering NPT 1/2, NPT 3/4, M20×1.5, G1/2, and G3/4 eliminate the need for thread adapters across North American, European, and international conduit systems.
The mounting bracket attaches to the actuator body and connects the ITS300 housing to the actuator stem. The bracket is adjustable in length and height to suit different NAMUR actuator frame sizes. Carbon steel is the standard bracket material. 304 stainless steel is available for corrosive area installations.
The ITS300 explosion proof limit switch box serves as a position feedback component wherever pneumatic quarter-turn actuators operate in classified hazardous environments.
Oil & Gas and Petrochemical Processing
Wellhead automation panels, pipeline isolation stations, and refinery process manifolds require verified position confirmation for every automated valve. The IIC gas group rating covers the most severe flammable gas conditions present in upstream and downstream oil & gas service.
Chemical and Solvent Handling
Solvent vapors, reactive gas atmospheres, and corrosive media create Zone 1 conditions throughout chemical production facilities. The ITS300 provides position feedback without introducing ignition sources into these environments. Stainless steel housing options are available for direct installation in chemical washdown areas.
LNG Terminals and Gas Distribution
LNG transfer systems and city gas distribution networks use automated valve sequencing for leak detection and emergency isolation response. The IIC classification covers natural gas and hydrogen service at LNG terminals and hydrogen fuel infrastructure.
Coal Handling and Mining
Pneumatic actuation eliminates electrical equipment at the valve location in coal handling systems. The ITS300 closes the feedback circuit while maintaining the absence of electrical ignition sources required for dust-classified environments.
Power Generation
Thermal and gas turbine power plants use automated valve control on cooling circuits, fuel supply lines, and exhaust systems. Position feedback supports the safety logic required for turbine protection systems.
KONTE is a professional flameproof limit switch box manufacturer, OEM factory, and global exporter headquartered in Wenzhou, China, operating under Kangsaite Automation Group (KST). We supply EPC contractors, system integrators, valve package assemblers, distributors, and OEM brand owners across 800+ active partnerships in 60+ countries.
Custom and OEM Manufacturing
Custom orders are accepted for modified cable entry thread standards, alternate housing colors, private-label markings on housing and documentation, and pre-assembled valve-actuator-limit switch packages. Wholesale and bulk supply pricing is available for distributors with recurring purchase volumes. Flexible MOQ terms apply for long-term supply agreements.
Inspection and Quality
Each unit undergoes 100% inspection before shipment, with photographic records stored for 10+ years. Inspection covers switch contact function, cable entry thread integrity, and housing seal condition. KONTE holds ISO 9001, CE, and ATEX certifications applicable to actuator accessories.
Global Warehouse Network
KONTE operates 15 overseas warehouses in the USA, Spain, Malaysia, Australia, Brazil, Turkey, Russia, Thailand, and additional regions. Local stock enables immediate dispatch and eliminates international freight lead times for buyers in these markets.
Q1: What is the functional difference between a limit switch box and an electro-pneumatic positioner?
A limit switch box generates binary electrical signals — one for fully open, one for fully closed. It provides position confirmation for on/off isolation valves. An electro-pneumatic positioner controls valve travel to any intermediate position in response to a continuous 4–20 mA input signal, and is used for modulating control valves. The ITS300 is a limit switch box and is not a positioner.
Q2: Which switch option is required for ATEX Zone 1 installation?
At the enclosure level, the ITS300 Ex d IIC T6 housing is rated for Zone 1. For the switch circuit itself, the intrinsically safe options (SFB2-V3-Y at 8V or SBB2-V3-DA at 24V) are required when the connected barrier and cable routing are designed to IS circuit specifications. The overall Zone 1 approval depends on the complete assembly design, not the housing alone.
Q3: Is the ITS300 compatible with Pepperl+Fuchs proximity switches?
Yes. The NJ2-V3-N (intrinsically safe, 8V) and NBB3-V3-Z4 (24V standard) are available as factory-fitted P&F proximity switch options. Both are installed and tested before shipment.
Q4: What actuator types does the ITS300 mount on?
The ITS300 mounts on any pneumatic quarter-turn rotary actuator with a NAMUR-standard stem connection. Compatible types include double-acting and spring-return (single-acting) pneumatic actuators driving 90° ball valves and butterfly valves.
Q5: Does KONTE offer OEM and distributor supply programs for this product?
Yes. KONTE supports OEM manufacturing with custom housing markings, documentation in buyer format, and pre-assembled actuator packages. Wholesale bulk supply is available under distributor agreements with volume-based pricing.
