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UL's HazLoc certification services for gas detectorsUL offers a variety of HazLoc certification options to manufacturers and users regarding gas or vapor detection equipment -- depending upon the needs of the end-application. The following are the three UL product categories under which gas or vapor detection equipment can be UL certified:
Classified Gas or Vapor Detection EquipmentThis UL Classification program covers portable and permanently installed gas or vapor detectors and associated equipment for detecting specific gases or vapors, that may be present in the atmosphere incidental to operations or from accidental release and for determining the extent of such release. Gas or vapor detectors in this category have been evaluated for risk of explosion, fire and electric shock only. Learn more about additional details on this service. Classified Gas or Vapor Detection Equipment EnclosuresThis UL Classification program covers gas or vapor detection equipment enclosures for use in hazardous (classified) locations, as indicated on the individual product. Enclosures in this category have been evaluated as to explosion and fire hazard only.Learn more about additional details on this service. Listed Gas or Vapor Detection EquipmentThis UL Listing program covers portable and permanently installed gas or vapor detectors and associated equipment for detecting specific gases or vapors, that may be present in the atmosphere incidental to operations or from accidental release and for determining the extent of such release. Gas or vapor detectors UL Listed for use in any of the groups under Class I hazardous locations have been tested with respect to safety of operation of the instrument in the presence of flammable and explosive mixtures of representative gases and vapors with air. Learn more about additional details on this service. UL certifications have been issued under all of these product categories. For additional information regarding any of these or other HazLoc services, please contact hazloc@ul.com.
Classified Gas or Vapor Detection Equipment  This UL Classification category covers gas or vapor detectors and associated equipment for detecting specific gases or vapors, that may be present in the atmosphere incidental to operations or from accidental release and for determining the extent of such release. They may be (1) of the portable type powered by batteries, (2) intended for permanent installation in accordance with the National Electrical Code, or (3) intended for installation in panel assemblies in accordance with the instructions provided. Gas or vapor detectors in this category have been evaluated for risk of explosion, fire and electric shock only. The basic standards used to investigate products in this category are UL508, "Industrial Control Equipment", and one or more of the following UL HazLoc standards - UL913, "Intrinsically Safe Apparatus and Associated Apparatus for Use in Class I, II and III, Division 1, Hazardous Locations", UL1203, "Explosion-Proof and Dust-Ignition Proof Electrical Equipment for Use in Hazardous (Classified) Locations" and UL1604, "Electrical Equipment for Use in Class I and II, Division 2, and Class III Hazardous (Classified) Locations". LOOK FOR THE UL CLASSIFICATION MARKING ON THE PRODUCT
The Classification Marking of Underwriters Laboratories Inc. (as shown above) on the product is the only method provided by UL to identify products manufactured under its Classification and Follow-Up Service. The Classification Marking consists of the UL Mark together with the word "CLASSIFIED" (as illustrated above), a control number, and one of the following statements - either "ONLY AS TO INTRINSIC SAFETY FOR USE IN HAZARDOUS LOCATIONS", or "AS TO FIRE, ELECTRICAL SHOCK AND EXPLOSION HAZARDS ONLY. For additional information regarding this or other UL HazLoc services, please contact hazloc@ul.com.
Classified Gas or Vapor Detection Equipment Enclosures This UL Classification category covers enclosures are for use in one or more of the following hazardous locations, as indicated on the individual product, in accordance with the National Electrical Code: Class I, Groups A, B, C and D; Class II, Groups E, F and G. The UL Classification covers the enclosure only. Enclosures in this category have been evaluated as to explosion and fire hazard only. The basic standard used to investigate products in this category is UL 1203, "Explosion-Proof and Dust-Ignition-Proof Electrical Equipment For Use in Hazardous Locations". LOOK FOR THE UL CLASSIFICATION MARKING ON THE PRODUCT
The Classification Marking of Underwriters Laboratories Inc. (as shown above) on the product is the only method provided by UL to identify products manufactured under its Classification and Follow-Up Service. The Classification Marking consists of the UL Mark together with the word "CLASSIFIED" (as illustrated above), a control number, and the following statement - "AS TO EXPLOSION AND FIRE HAZARD ONLY. ENCLOSURES FOR USE IN HAZARDOUS LOCATIONS." For additional information regarding this or other UL HazLoc services, please contact hazloc@ul.com.
Listed Gas or Vapor Detection Equipment This UL Listing category covers gas or vapor detectors and associated equipment for detecting specific gases or vapors, that may be present in the atmosphere incidental to operations or from accidental release and for determining the extent of such release. They may be (1) of the portable type powered by batteries, (2) intended for permanent installation in accordance with the National Electrical Code, or (3) intended for installation in panel assemblies in accordance with the instructions provided. Gas or vapor detectors UL Listed for use in any of the groups under Class I hazardous locations have been tested with respect to safety of operation of the instrument in the presence of combustible mixtures of representative gases and vapors with air. The flame arresters provided in the intake and suction lines of these instruments have been tested in the presence of flammable and explosive mixtures representative of the gases or vapors that the instruments are designed to detect and of the hazardous locations for which the detector has been Listed. Associated equipment may not necessarily be suitable for use in hazardous locations. These instruments, when installed, maintained, and operated in compliance with the manufacturer's instructions, indicate percent of concentration or percent of the lower flammable limits of the specific gases or vapors. In some cases, meter readings must be interpreted in accordance with calibration data furnished by the manufacturer. Gas or vapor detectors should be calibrated and inspected by the operator in compliance with the manufacturer's instructions, as performance of the instruments will depend on proper maintenance. The instruments should be calibrated with known gas- or vapor-air mixtures at intervals, and particularly after replaceable sensors incorporated in the detecting unit are replaced. Certain gases or vapors may adversely affect (poison) the sensors, and the use of the instruments in sampling atmospheres containing gases or vapors for which they have not been previously calibrated should, therefore, be avoided. Minor variations in the flow of sample aspirated to the detecting unit do not affect the operation of these instruments to any great extent. However, as the instruments become inoperative in the event of clogging of sampling lines, flame arresters, or filters, precautions should be taken to keep these components clean and free from obstructions. Where condensation of vapors occurs in the detecting unit, or in the sampling lines and fittings, erroneously low indications by the instrument may result. Absorption of appreciable amounts of certain gases or vapors by nonmetallic tubing used as sampling lines may also result in incorrect indications by the instrument. The basic standards used to investigate products in this category are UL508, "Industrial Control Equipment", ISA S12.13, "Performance Requirements, Combustible Gas Detectors" and one or more of the following UL HazLoc standards - UL913, "Intrinsically Safe Apparatus and Associated Apparatus for Use in Class I, II and III, Division 1, Hazardous Locations", UL 1203, "Explosion-Proof and Dust-Ignition Proof Electrical Equipment for Use in Hazardous (Classified) Locations", and UL1604, "Electrical Equipment for Use in Class I and II, Division 2, and Class III Hazardous (Classified) Locations". The Listing Mark of Underwriters Laboratories Inc. (as shown above) on the product is the only method provided by UL to identify products manufactured under its Listing and Follow-Up Service. The Listing Mark for these products includes the name and/or symbol of Underwriters Laboratories Inc. (as illustrated above) together with the word "LISTED", a control number, and one of the following product names as appropriate - "(COMBUSTIBLE) GAS DETECTOR FOR HAZARDOUS LOCATIONS" or "(COMBUSTIBLE) VAPOR DETECTOR FOR HAZARDOUS LOCATIONS", or other appropriate product name as shown in the individual listing. The word "COMBUSTIBLE" in the product name is optional. For additional information regarding this or other UL HazLoc services, please contact hazloc@ul.com.
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