UL 2043-2018 pdf free download

UL 2043-2018 pdf free download.Fire Test for Heat and Visible Smoke Release for Discrete Products and Their Accessories Installed in Air-Handling Spaces.
4.2.2 Carbon dioxide and carbon monoxide analyzer
4.2.2.1 If used in the Heat Release Rate calculations, the CO and CO2 analyzers are to be calibrated according to procedures in Standard Practice for Full-Scale Oxygen Consumption Calorimetry Fire Tests, ASTM E2067.
4.3 Heat release rate
4.3.1 Calibration of the heat-release instrumentation is to be conducted prior to each day’s testing by burning propane gas using the standard Ignition source specified In 3.2. The gas is to be supplied to the burner through a calibrated flowmeter. The heat release calculated from the metered gas input is to be compared to the heat release as measured by calculating the amount of oxygen consumed. The burner is to be positioned in the center of the test enclosure.
4.3.2 A nominal exhaust flow rate through the duct of at least 1500 cubic feet per minute (0.71 m3/s) is to be sufficient to provide adequate air flow to capture the products of combustion. The gas supply to the burner is to be CP-grade propane (99 percent pure) or propane having a known net heating value of 2500 Btu (thermochemical) per cubic loot [93.0 MJ/m3 or 22.2 kilocalories (thermochemical) per cubic meter]. The flow rate of propane is to be metered and kept constant throughout the calibration test for each step change. Heat-release values of 60 and 160 kilowatts are to be used for calibration. These values are equivalent to 88.3 and 253 cubic feet per hour (694 and 1851 cm3/s respectively) of propane at a pressure of 14.7 psi (101 kPa) standard atmospheric pressure, measured at the flow gauge and a standard temperature of 68F (20°C). The test is to be conducted for 10 minutes.
4.3.3 Oxygen consumption measurements are to be made at 2 second intervals, or less starting 60 seconds prior to burner ignition. A calibration constant (C) is to be obtained as described in 7.1.1. A calibration constant that deviates more than 5 percent from the previous constant indicates instrument malfunction. When this occurs, the test is to be suspended until the equipment measurements indicate the correct calibration constant.
4.3.4 The heat release rate (HRR) and smoke release rate (SRR) of propane at 60 kW are to be determined during this calibration.
4.3.5 The gas supplied to the burner is to be Special Duty Propane as defined in the Standard Specification for Liquefied Petroleum (LP) Gases. ASTM D1835; or HD-5 Propane as defined in the Standard for Liquefied Petroleum Gas Specifications and Test Methods. GPA Standard 2140; or CP.Grade Propane. This gas has a nominal heating value of 2500 Btu (thermochemical) per cubic foot [93.1 MJIm3 or 22.2 kilocalories (thermochemical) per cubic meter]. The flow rate of propane is to be metered and kept constant throughout the calibration test for each step change. Net heat output values of 60 and 160 kilowatts are to be used for calibration. These values are equivalent to nominal 88.3 and 235 standard cubic feet per hour. respectively (694 and 1851 crn3/s, respectively) of propane at a pressure of 14.7 psi (101 kPa) standard atmospheric pressure, measured at the flow gauge and a standard temperature of 68°F (20°C).UL 2043-2018 pdf free download.