UL 920004-2017 pdf download – Performance Requirements for Open Path Toxic Gas Detectors.
4 General requirements 4.1 Introduction 4.1 .1 Where an equipment manufacturer makes any claims regarding any special features of construction or superior performance that exceed these minimum requirements, all such claims shall be verified and the test procedures shall be extended or supplemented where necessary to verify the claimed performance. 4.1 .2 Electrical assemblies and components shall comply with the construction and performance requirements of 4.4 and Clause 5, where applicable. In addition, parts of the equipment intended for use in hazardous (classified) locations shall employ materials and comply to the construction and explosion protection as specified in the appropriate standards. 4.2 Markings 4.2.1 Marking on the product or, if not possible due to size, on its packaging or label accompanying the product, shall include the following information: a) Manufacturer’s name or trademark and address b) Specific model designation and serial number c) Year of construction (may be encoded within the serial number) d) Equipment ratings (voltage, frequency, current or power, etc.) e) Equipment operating ambient temperature range f) “ISA-92.00.04” 4.2.2 The model or type identification shall correspond to the manufacturer’s catalog designation and shall uniquely identify the product. 4.2.3 The marking required in 4.2.4 shall appear legibly and indelibly on each gas detection equipment in the following manner, as applicable: a) For stationary equipment, the marking required in 4.2.4 shall appear in a location where it will be visible after installation and in direct sight during the routine periodic re-calibration and adjustment of set point(s). For modular control units comprising one or more control modules in a common enclosure or mounting assembly, the marking need not be repeated on each module, but may appear as a single marking on the common portion of the assembly.
4.2.4 All open path gas detection equipment shall be marked: ‘‘CAUTION — READ AND UNDERSTAND INSTRUCTION MANUAL BEFORE OPERATING OR SERVICING.’’ The word ‘‘CAUTION’’ of the foregoing shall be in capital letters at least 3.0 mm high. The balance of the wording shall be in capital letters at least 2.5 mm high. 4.2.5 Where the design of special features of the equipment requires additional markings or a change in marking requirements, the additions or revisions are allowed, but the safety and instructional intent of this section shall be met. 4.3 Manufacturer’s installation and operation manuals 4.3.1 Each gas detection equipment shall be provided with an instruction manual, furnished by the manufacturer. The requirements of 4.3.2 through 4.3.5 shall be included as applicable. Instructions shall be consistent with the markings required in 4.2. 4.3.2 The following shall be incorporated in the manufacturer’s instruction and operation manuals: 1 ) Installation instructions. 2) Operating instructions including initial start-up and alignment. 3) Maintenance instructions. 4) Troubleshooting guide including a list of all fault indications. 5) Certification information as applicable. 6) Consideration of known conditions that may impair the reliability of the open path gas detection equipment. 7) Optional accessories (e.g., aperture, weather-protecting devices) and state their effects on the instrument. 8) Details of any special conditions of service. 9) List of available gas calibrations with corresponding accuracy and t 90 response time. 1 0) For a stand alone open path gas detector or a stand alone control unit the following note shall be provided: “The t 90 response time of the stand alone open path gas detector and the stand alone control unit shall be added together and shall not exceed 1 0 seconds.” 1 1 ) Electromagnetic compatibility.