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Item # SLEX-HI-LED-01/3"SVTC, SLEX-100 Series Hazardous Location Lights

PAPAILIAS, Inc. series SLEX-HI-LED-00, 230VAC High-Intensity LED  compact, explosion-proof light UL-844 & C-UL/CSA C22.2 listed to provide lighting and viewing through a single sight port.

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.

PAPAILIAS, Inc. series SLEX-HI-LED-01, 230VAC uses a high intensity LED [HI-LED] light engine technology to rovide bright, glare-free illumination of the interior of vessels, tanks, hoppers, silos, mixers, and other normally closed containers in hazardous locations requiring explosion-proof equipment.  These fixtures do not generate excessive heat, feature long lamp life and consume less energy than their Halogen equivalents. 

When it comes to explosion proof light fixtures and lighting for sight glasses, PAPAILIAS is an industry leader in new and innovative technologies. Our industry experience sets us above the competition in lighting the way into your process systems.


•  Extended lamp life reduces operating costs
•  35,000 hour lamp life vs. 1000~2000hrs 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 sight glass or vessel                                    
•  Far less heat generation than a 100 watt halogen bulb
•  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 100watt 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

Various PAPAILIAS, Inc. fixtures feature UL Listings.

Specifications  · Features  · Hazardous Locations: Definitions & Classifications  · Basic Principles Applied to Explosion-proof Equipment  · Additional Description  · Note


Clamp Sizes

3 in

Lamp Type

High Intensity LED [HI-LED]

Maximum Power

100 Equiv. W







Temperature Code


Line Voltage (AC)

240 V

Approximate Lumens




Industry Standards/Certifications

UL-844 Listed

Mounting Style

Slotted Brackets

Fixture Material

Copper-free (<0.004 Copper Content) Aluminum Alloy No. 356T6.

Intended Applications


Other Normally Closed Containers in Hazardous Locations




  • The fixture can be relamped without removing the unit from the sight port or disturbing 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.
  • The corrosion resistant 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.

Hazardous Locations: Definitions & Classifications
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

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.

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.

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.

Additional Description
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 sight glass 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.

  1. Line voltage 120 VAC or 220 VAC only. Maximum UL & C-UL listed power: 100 watts. Approximate Lumens: 1800.
  2. Maximum operating temperatures listed represent the maximum external surface equilibrium temperature the fixture at a 40 ºC ambient condition as measured by Underwriters Laboratories. Maximum operating temperature data should be used the plant safety engineer to determine suitability of the fixture for use particular hazardous location.


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Data Sheet
(PDF, 171KB)

IOM Manual
(PDF, 1116KB)