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Series SLEX-100 HI-LED & REX-100 HI-LED
 

SLEX-100 HI-LED & REX-100 HI-LED - A compact, explosive-proof light UL- 844 & C-ULC/CSA C22.2 listed to provide lighting and viewing through a single sight port.

  • UL-844 & cUL/CSA C22.2 No. 137 Listed
  • Lighting for Hazardous Locations
  • Halogen or High-Intensity LED (HI-LED) Versions
  • Standard & SVTC Sanitary Models

Overview
Series SLEX/REX-100 explosion-proof sight lights deliver bright, glare-free illumination into vessels, tanks, hoppers, silos, mixers, and pipelines through a single sight port. Designed for hazardous (classified) locations, the fixtures mount **completely externally** to the sightglass flange — outside vessel pressure.

  • SLEX-100 — Standard model (no reflector)
  • REX-100 — With highly polished internal reflector for increased intensity
  • HI-LED Option — Available on both models (same 100 W output as halogen, dramatically longer life)
  • SVTC Sanitary Version — Integrates 3" or 4" clamp-style sightglass (ideal for pharmaceutical & food-grade applications)

The fixture can also serve as an illumination port paired with a separate viewing sightglass (e.g., for TV/video camera use).

Key Features & Benefits
- 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)
- **HI-LED advantages** (Series HI-LED):
- 40,000–50,000 hour lamp life
- Cool operation (housing stays cool — no overheating risk)
- Completely immune to vibration (no filament)
- Bright white light (~1,800 lumens — equivalent to or brighter than 100 W halogen)
- Can remain energized continuously

Technical Specifications

Electrical
- Voltage: 120 VAC (220/230 VAC also available)
- Maximum power: 100 watts
- Approximate output: 1,800 lumens

Hazardous Location Rating (identical for halogen & HI-LED versions)

Model Reflector Watts (max) Class DIV Group Temp Code Max Oper Temp
SLEX-100 HL NO 100 I 1,2 C,D T4A 120°C
SLEX-100 HL NO 100 II 1 E,F,G T3C 160°C
Code No. T1 T2 T2A T2B T2C T2D T3 T3A T3B T3C T4 T4A T5 T6
°C 450 300 280 260 230 215 200 180 165 160 135 120 100 85
°F 842 572 536 500 446 419 392 356 329 320 275 248 212 185

* Operating temperatures exceed safe temperatures for some Group C materials.  To prevent fire or explosion, install only as intended.

1. Line voltage, 120 volts AC only. Maximum UL & C-UL listed power: 100 watts. Approximate Lumens: 1800.

2. Maximum operating temperatures listed represent the maximum external surface equilibrium temperature of the fixture at a 40 degrees C ambient condition as measured by Underwriters Laboratories. Maximum operating temperature data should be used by the plant safety engineer to determine suitability of the fixture for use in their particular hazardous location.

REX note: Operating temperatures may exceed safe limits for some Group C materials. Install only as intended.

SVTC Sanitary Light Glass Models
- Clamp sizes: 3" or 4" (316L stainless steel)
- Pressure rating: 150 PSIG / full vacuum
- Temperature limit: 500°F (higher ratings available)
- Same hazardous location ratings as standard models above

Installation Highlights (Installer Quick Guide)
SLEX-100- Verify fixture rating matches area classification
- De-energize circuit before installation
- Mount fixture centered and securely to sight glass (use supplied brackets; ensure rigid, vibration-free installation)
- Use 150°C-rated supply wire
- Ground through conduit
- Ensure enclosure is fully closed and sealed before energizing
- Operate via customer-supplied hazardous-location switch

Start-up: Confirm mounting, wiring integrity, and enclosure closure prior to power-up.

Operation & Maintenance
- Operation: Energized via external hazardous-location switch. No routine operation required beyond normal on/off.
- Maintenance: Lamp replacement only (no other routine service needed). HI-LED versions are virtually maintenance-free.

Dimensions (Typical – SLEX/REX-100)
- Overall width (across brackets): 10 7/8" (276 mm)
- Body diameter: 4½" (114 mm)
- Height (body): 4 1/8" to 4 13/16" depending on view
- Conduit hubs: ½" FNPT (3 places)
- Refer to factory drawing SLEX-100-SVTC-DWG for exact mounting dimensions and SVTC clamp details.

For complete dimensional drawings, IOM manual, or certified prints, contact Northeast Controls.

Northeast Controls Incorporated
TEL: 201-419-6111 | FAX: 201-419-6109
www.nciweb.com | sales@nciweb.com

Made in USA — UL & cUL Listed Explosion-Proof Lighting for Hazardous Locations Since 1969.

Specifications subject to change without notice. Always verify current ratings with factory.
 
HI-LED Lighting Series:

The Hi-LED Series illuminators offer lower overall cost of ownership than halogen lamps. Longer lamp life, 35,000 – 40,000 hours vs. 1,000 – 2,000 hours for halogen, requires less bulb replacement. This results in savings on lamp costs; cost of labor to replace bulbs; and downtime. Unlike halogen bulbs, Hi-LED lamps have no filament so shock and vibration will not affect lamp life or cause premature failure. Hi-LED lamps do not generate the excessive
heat that a 100 watt halogen lamp does. Hi-LED technology runs cool and can operate continuously without overheating the electronics and burning out the lamp.

Hi-LED fixtures also reduce costs by making maintenance easier. The extended lamp life of Hi-LED Series reduces the inconvenience and nuisance factor of replacing burned out lamps, especially when they are difficult to access. The Hi-LED fixture housing does not transmit heat into the sight glass or vessel, eliminating the negative effect heat may have on some applications. Hi-LED fixtures emit uniform, bright, white light thatoffers an excellent view of the vessel, making them ideal for use with video camera monitoring systems.

High Intensity LED Light Engine Features:

  • Extended lamp life reduces operating costs
  • 35,000 – 40,000 hour lamp life vs. 1000 – 2000 hours for halogen
  • Robust Technology – vibration, heat, dust, and surface oil resistant
  • Ideal for use with video camera monitoring systems
  • No Excessive Heat
  • Continuous operation
  • No heat transmission into sightglass or vessel
  • Less heat generation than a 100 watt halogen bulb

Custom Designed, Energy Efficient, Compact Hi-LED™ LED Array Meets LM80 Energy Star Standards

Hi-LED Series lighting is not an “off-the-shelf” LED bulb. It was custom designed for Papailias to include features that save energy, provide uniform light, and extend the life of the lamp to reduce overall operating costs. The heart of the unit, the LED array, has been LM80 tested and is approved for the Energy Star program. State-of-the-art optics control the light in a specific uniform pattern, eliminating the hot spots and yellow tint that halogen bulbs produce.

  • Twice the light at 1/3 the wattage of other LED fixtures
  • 22% more light intensity than a 100 watt halogen bulb
  • 93% less energy than a standard 100 watt halogen bulb
  • Lasts 98% longer than a standard 100 watt halogen bulb
  • LED array LM80 tested to Energy Star standards
  • Custom optics provide bright, white, high intensity, uniform light with no hot spots or yellow tint bulb
 
HAZARDOUS LOCATIONS: DEFINITIONS & CLASSIFICATIONS (click to open or close)
The classifications and definitions have been simplified and abbreviated. For a complete listing of the various liquids and vapors, consult American National Standard ANSI/NFPA 497M and Articles 500 through 503 of the NEC. The final determination of hazardous location requirements must be made by your local inspector.
Classes

Class I. Flammable gases or vapors.
Class II. Combustible dusts.

Divisions

Division 1. Hazardous conditions present under normal operating conditions.
Division 2. Hazardous conditions present only in case of abnormal or unusual operating conditions, such as failures of mechanical ventilation systems or ruptures of containers.
Class I Locations
Group C. Atmospheres containing acetaldehyde, cyclopropane, diethyl ether, ethylene, isoprene, unsymmetrical dimethyl hydrazine (UDMH), etc.
Group D. Atmospheres containing acetone, acrylonitrile, ammonia, benzene, butane, 1-butanol (butyl alcohol) ethane, methane, methyl ethyl ketone, petroleum naphtha, octane, pentane, etc.

Class II Locations

Group E. Atmospheres containing dusts of aluminum, magnesium or their commercial alloys.
Group F. Atmospheres containing carbon black, coal or coke dust.
Group G. Atmospheres containing flour, starch or grain dust.
 
 
Basic principles applied to explosion-proof equipment

Enclosures for equipment in Class I locations must be explosion proof. This does not mean that they are made so that explosive gases or vapors cannot enter into them. They are made so that such gases or vapors can enter the enclosure, where they do ignite and explode, but the enclosure is made so that it can withstand and contain the force of the explosion. Moreover, the hot exploded gas does escape, but not until after it has passed through a tight joint that is either threaded or has a wide ground-finish flange. In either case, before it finally escapes to the outside of the enclosure, it has cooled to a temperature below the ignition temperature of the gas in the surrounding atmosphere. The cooling takes place while the gas passes through the long circuitous path of a threaded joint, or across the wide, tight-fitting ground-finish flange.

For Class II locations, enclosures must be dust-ignition-proof. Dust can be prevented from entering enclosures by means of gaskets, and enclosures can be made with large exposed surfaces for more rapid heat dissipation.

If a Class II dust-ignition-proof enclosure is used in a Class I location, gas can get in, explode and blow the enclosure to pieces; this might set off a larger explosion in the general area, leading to fire or injury to people. Likewise, if a Class I explosion-proof enclosure is installed in a Class II location, it can overheat when blanketed with dust and start a fire. Therefore, it is important that equipment be labeled for the specific location and division where it is installed.
 
See Installation and Maintenance Instructions