SLEX-100 & REX-100 Series
Halogen & HI-LED Explosion-Proof Lighting for Single-Port Sightglass Viewing
The SLEX/REX-100 series are compact, explosion-proof sight lights that deliver bright, glare-free illumination into vessels, tanks, hoppers, silos, mixers, and pipelines through a single sight port. UL-844 and C-UL/CSA C22.2 No. 137 listed for hazardous (classified) locations, these fixtures mount completely externally to the sightglass flange — entirely outside vessel pressure. Available in halogen and High-Intensity LED (HI-LED) versions, with a sanitary clamp model for food, beverage, and pharmaceutical applications.
The fixture can also serve as an illumination port paired with a separate viewing sightglass — for example, for TV or video camera monitoring applications.
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Request PricingHalogen & LED Model Overview
SLEX-100
Standard Model
No internal reflector. Compact explosion-proof light for single-port sightglass viewing in hazardous locations. Available in halogen or HI-LED.
REX-100
Reflector Model
Equipped with a highly polished internal reflector that increases illumination intensity over the standard SLEX-100. Available in halogen or HI-LED.
SLEX-100 HI-LED
Standard + High-Intensity LED
Same 100W equivalent output as halogen with dramatically longer lamp life (40,000–50,000 hours). Cool operation, vibration immune.
REX-100 HI-LED
Reflector + High-Intensity LED
Polished reflector combined with HI-LED technology for maximum illumination intensity and long-life, low-maintenance operation.
Electrical Specifications
Hazardous Location Ratings
Identical ratings apply to both halogen and HI-LED versions.
* Operating temperatures exceed safe temperatures for some Group C materials. Install only as intended. Always verify current ratings with factory.
Temperature Code Reference
Highlighted codes (T4A, T3C) are the ratings applicable to the SLEX-100 HL. Maximum operating temperature data should be used by the plant safety engineer to determine suitability for their specific hazardous location.
Construction & Design Features
- →Relamp without removing the fixture from the sight port or disturbing any wiring
- →Separate, individually explosion-proof lamp and wiring compartments
- →Heavy-wall copper-free aluminum alloy castings (No. 356T6) — corrosion resistant
- →Borosilicate glass lens with precision-machined seal
- →Supplied with slotted mounting brackets for easy installation on new or existing sightglasses (3-1/4", 4", or larger circular flanges)
- →½" FNPT conduit entries (3 places)
- →Fixtures mount completely externally to the sightglass flange — outside vessel pressure
Halogen Models — Ordering Reference
HalogenThe SLEX-100 and REX-100 halogen series use a high-intensity halogen lamp to provide bright, glare-free illumination through a single sight port. The REX-100 adds a highly polished internal reflector for increased illumination intensity over the standard SLEX-100. Both series are UL-844 and C-UL/CSA C22.2 No. 137 listed for Class I, Division 1 hazardous locations. Available in 50 W and 100 W versions at 120, 230, or 240 VAC. The halogen lamp is also available as a retrofit into existing SLEX-100 housings, and the fixture can be relamped without removing it from the sight port or disturbing any wiring.
REX-100 series includes a polished internal reflector for higher illumination intensity. SLEX-100 series is the standard (no reflector) model. Contact Northeast Controls for 220 VAC or other voltage configurations.
HI-LED Models — Ordering Reference
RecommendedThe SLEX-HI-LED and REX-HI-LED series use High-Intensity LED (HI-LED) light engine technology to deliver bright, glare-free illumination through a single sight port — without the heat, short lamp life, or high energy draw of halogen. At only 8 watts actual draw (100W equivalent output), these fixtures provide 22% more light intensity than a 100W halogen bulb while consuming 93% less energy. UL-844 and C-UL/CSA C22.2 No. 137 listed. Available in 120 V and 240 V; the REX-HI-LED adds a polished internal reflector for increased intensity.
All HI-LED models: 8W actual / 100W equivalent. REX-HI-LED includes polished internal reflector. SLEX-HI-LED is the standard (no reflector) model. Contact Northeast Controls for other voltage configurations or SVTC sanitary clamp HI-LED models.
Why Upgrade to HI-LED?
35,000-Hour Lamp Life
vs. 1,000–2,000 hours for halogen — dramatically fewer replacements, lower labor costs, and less downtime. Lasts 98% longer than a standard 100W halogen bulb.
No Excessive Heat
No heat transmission into the sightglass or vessel. Far less heat generation than a 100W halogen bulb. Housing stays cool — continuous operation without overheating.
Robust Technology
Vibration, heat, dust, and surface-oil resistant. No filament means shock and vibration will not affect lamp life — ideal for pumps, mixers, and mobile equipment.
22% More Light Than 100W Halogen
Twice the light at 1/3 the wattage of other LED fixtures. ~1,800 lumens equivalent output with custom optics for uniform, bright white light.
Uniform White Light — No Hot Spots
Custom optics provide bright, white, high-intensity, uniform illumination with no hot spots or yellow tint. Ideal for video camera monitoring systems.
93% Less Energy
Only 8 watts actual draw vs. 100 watts for halogen. Energy savings alone can offset the cost of upgrading in many applications.
LM80 Tested / Energy Star
LED array LM80 tested to Energy Star standards. Continuous operation capability without burning out the lamp or overheating electronics.
Maintenance-Free Operation
Extended lamp life reduces the inconvenience of replacing burned-out lamps, especially in difficult-to-access or hazardous locations.
SLEX/SVTC & REX/SVTC — Sanitary HI-LED Light Glasses
Combination Explosion-Proof HI-LED Light & Integral Sanitary Clamp Sightglass Assembly
The SLEX/SVTC and REX/SVTC series integrate a Series SVTC sanitary clamp-type sightglass directly into the SLEX/REX explosion-proof lighting fixture — the lens is an integral part of the unit, not a loose component. This allows users to illuminate the contents of a pressurized vessel or pipeline with HI-LED or 100W halogen intensity on existing standard sanitary clamp ferrules. Anodized aluminum parts provide greater cleanliness and aesthetic appeal, making the unit highly popular for pharmaceutical applications. All wetted parts are machined T316 stainless steel (optional materials available), PTFE, and glass.
Key Specifications
SVTC HI-LED Models — Ordering Reference
REX/SVTC includes polished internal reflector for higher illumination intensity. SLEX/SVTC is the standard (no reflector) model. Halogen SVTC models also available — contact Northeast Controls for configurations not listed.
Dimensions (Typical — SLEX/REX-100)
For complete dimensional drawings, IOM manual, or certified prints, contact Northeast Controls. Refer to factory drawing SLEX-100-SVTC-DWG for SVTC clamp details.
Installation Highlights
Verify Classification
Confirm fixture rating matches the area classification before installation.
De-Energize Circuit
De-energize circuit before installation. Operate via customer-supplied hazardous-location switch.
Secure Mounting
Mount fixture centered and securely to sightglass using supplied brackets. Ensure rigid, vibration-free installation.
Wiring Requirements
Use 150°C-rated supply wire. Ground through conduit. Ensure enclosure is fully closed and sealed before energizing.
Listings & Certifications
UL-844
Electric lighting fixtures for hazardous (classified) locations
C-UL/CSA C22.2 No. 137
Canadian listing for hazardous location lighting fixtures
Made in USA
UL & cUL listed explosion-proof lighting for hazardous locations since 1969
SLEX-100 / REX-100 — Pricing & Availability
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