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Series SLEX-100 and REX-100


  • LED Version is 22% brighter than the standard 100 watt halogen
  • Use 93% less electricity than 100 watt halogen
  • 35,000 - 40, 000 continuous service hours
  • Green solution. Consumes only 4 watts!
  • Meets Energy Star requirements
  • Does not generate excessive heat
  • Unaffected by vibration or shaking since there is no filament
Series SLEX-100 and REX-100 offer a compact, explosive-proof light UL- 844 & C-ULC/CSA C22.2 listed to provide lighting and viewing through a single sight port.  It uses a powerful 120 Volt 100 Watt Tungsten Halogen bulb.


Explosion-proof, UL-844 and C-UL/CSA C22.2 No. 137 listed, electric lighting fixtures are used in hazardous (classified) locations, lights for single port viewing have been designed to meet the needs of our customers who require lighting and viewing through a single sight glass.

Designated the SLEX-100 and REX-100, both models use high-intensity halogen lamps  technology to provide bright, glare free illumination of the interior of vessels, tanks, hopper, silos, mixers and other normally closed containers in hazardous locations requiring explosion-proof equipment. The REX-100 is provided with a highly polished internal reflector which increases the illumination intensity.

The explosion-proof light can be supplied mounted to the upper flange of our circular sight glass to form a complete light/sight glass assembly. The light fixture can also be mounted to our smaller viewing diameter sight glasses such as 3 1/4" and 4" to form illumination ports. The illumination port used in conjunction with a standard sightglass offers the user many options. A typical option would be the use of a video or TV camera on the free sight glass while the illumination port provides the necessary lighting.

The explosion-proof light fixtures can also be easily mounted to existing sight glasses by means of the slotted brackets provided.

Standard Features:
  • The fixture can be relamped without removing the unit from the sight port or distributing any electrical connections.
  • Lamp and wiring compartments are separate and are individually explosion-proof per UL-844 and C-UL/CSA C22.2 No. 137.
  • Lighting fixture is mounted to outer sight glass flange, completely external to vessel pressure. The fixture can easily be mounted on existing pressure vessel installations by means of brackets provided.
  • For corrosion resistance, fixtures are made of copper-free (less than 0.004 copper content) aluminum alloy - No. 356T6.
  • Castings have heavy walls to withstand internal explosions without damage. They will also contain and extinguish the flames of burning gases - before they ignite the surrounding atmosphere.
  • All metal joints are either threaded or ground. The glass lens is finely ground borosilicate glass that mates with the precisely machined seat in the body of the fixture to form the seal.


NEW HI-LED Lighting Series:

SLEX-100The new HI-LED Lighting Series is a high intensity light engine designed to replace halogen technology. The HI-LED is not a standard LED bulb. Custom designed, it offers more robust technology than halogen bulbs. Unlike Halogen bulbs, HI-LED lamps have no filament and are not affected by vibration, impact, heat, dust, or surface oils. Since they do not generate heat, which causes halogen bulbs to burn out prematurely, they may be left on continuously without over heating the fixture housing. The HI-LED provides a bright white light and emits as much or more light intensity (candle power and lumens) as a 100 watt halogen bulb. HI-LED technology offers 40,000 - 50,000 hour lamp life for continuous duty (almost 5 years) versus 1,000 - 2,000 lamp life for halogen. HI-LED lighting is available for both non-hazardous and explosion-proof light fixtures.

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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

1. Line voltage, 120 volts AC only. Maximum UL & C-UL listed power: 100 watts. Approximate Lumens: 180.

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.

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.

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


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.