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1. UL Horizontal and Vertical Combustion Tester UL94 Standard Requirements
The strict standard requirements for UL horizontal and vertical combustion testing are as follows: the ventilation window volume must be greater than or equal to 0.7 cubic meters to ensure the accuracy of combustion testing, and it is recommended to equip it with a glass observation door. Adequate oxygen supply is crucial during the testing process. Sealed box configuration: A flat mirror should be placed inside for easy observation after testing. Spray nozzle specifications: The length should be 100 ± 10mm, the inner diameter should be 9.5 ± 0.3mm, and it should comply with ASTM D 5025 standard. Timer accuracy: It must achieve a high precision of 0.1 seconds. Gas source: Use technical grade methane gas (with a purity of at least 98%), equipped with regulating devices and flow meters to ensure uniform gas flow. The heat output of natural gas should be controlled at 37 ± 1MJ/m. Temperature and humidity treatment room: The temperature is maintained at 23 ± 2 ° C, and the relative humidity is within the range of 50 ± 5%. Measurement tool: The micrometer requires a reading accuracy of 0.01mm, and the dryer should contain anhydrous calcium chloride or other desiccants to ensure that the humidity is below 20% at 23 ± 2 ° C. Oven: It must be a fully ventilated circulating air oven with at least 5 air changes per hour and temperature controlled at 70 ± 2 ° C. Pressure measurement: The pressure gauge should be able to measure up to 200mm water column pressure with a pressure increment of 5mm. Flow meter: It is recommended to use a calibrated ASTM D 3159 rotor flow meter or a mass flow meter with an accuracy of ± 2% (recommended by UL laboratory)
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Measurement: Hot wire anemometer, hot wire anemometer, electronic dynamometer, electronic indicator, combustion analyzer, communication analyzer, pressure sensor, pressure transmitter, precision sound level meter, emission emissions emissions emissions emissions, exhaust pollutants, gaseous pollutants, evaporative emissions, crankcase emissions, crankcase emissions, leakage by gas, ammonia oxides of nitrogen, carbon monoxide, hydrocarbons, methane, methane, non methane hydrocarbons, photochemical active hydrocarbons, photochemical reactive hydrocarbons, particulate matter, particulate matter, particulate matter, particulate matter, black Smoke Black Smoke Blue Smoke White Smoke Carbon Smoke Soot Photochemical Smoke Smog Odor Propane Emission Concentration of Emission Exhaust Smoke Initial exhaust, subcritical exhaust, supercritical exhaust, forced exhaust, free exhaust, advanced exhaust, advanced exhaust, delayed exhaust, lag exhaust, heat loss, exhaust purification, exhaust purification, exhaus