RSMD-A plastic smoke density tester Introduction: It is applicable to the determination of the specific optical density of the smoke generated during the combustion of plastics, and the maximum specific optical density is taken as the test result. It is used to evaluate the smoking performance of plastics under specified conditions. It conforms to GB8323.2-2008 Plastics Smoke Generation Part 2: Test Method for Determination of Smoke Density by Single Chamber Method and ISO5659.2-2006 Plastics Smoke Generation Part 2: Determination of Optical Density by Single Chamber Method. The whole instrument is composed of closed test chamber, photometer measurement system, radiation cone, combustion system, igniter, test box, support, temperature measuring instrument and smoke density test software; This instrument is suitable for all plastics and also for the evaluation of other materials (such as rubber, textile coverings, painted surfaces, wood and other materials). It is widely used in the production plants of plastic industry and solid material industry, as well as scientific research and testing institutions. Technical parameters: 1. . Test chamber: 1.1 The front door is equipped with a window and an opaque light shield that can block the window movement. 1.2 The bottom of the square box is equipped with bursting aluminum foil to prevent overpressure, which is composed of a safety bursting disc with a thickness of 0.04mm, a length of 405mm, a width of 200mm and a total area of 81000mm2, and is equipped with a pressure regulating device inside the box (see Figure 2). 1.3 Light window: upper and lower? 75mm light window, and a 9W annular electric heater is equipped below the light window to ensure the temperature of the upper surface of the light window (50 ° C~55° C is appropriate) so as to minimize the smoke concentration on the surface. The light window is on the top of the test box, and an 8mm thick optical platform is installed around the light window outside the test box? The 15mm metal bar that can connect the fixed platform and the test box is fixed. 1.4 Internal dimension: height 914mm X width 914mm X depth 610mm 1.5 Material: It consists of three layers: the outer layer is 1.5mm thick steel plate, the high temperature electrostatic baking cream white paint, the middle layer is 60mm thick asbestos layer, the inner layer is 1.2mm thick USU304 stainless steel, and the high temperature electrostatic baking black paint, which can be easily cleaned. 1.5 Air inlet and exhaust port: the air inlet is installed on the top of the test box, with a diameter of Φ 65mm, the closing and closing state is controlled by the solenoid valve with flange; The exhaust port is installed at the bottom of the left side, with a diameter of Φ 80mm, the closing and closing state is controlled by the solenoid valve with flange, and the exhaust fan is attached. 2. Photoelectric measurement system: composed of power supply, photomultiplier tube, amplification transparency, shutter, filter, neutral transparency, lens, optical system dark box, light source, light window heater 2.1 Light source: 2.1.1 Light source: it is composed of 6.5V incandescent lamp, power transformer (input 220V output 6.5V) and variable resistor. 2.1.2 Installation: The bulb is installed in the light tight dark box at the bottom of the test box and consists of light source, convex lens, light window heater and optical window. 2.1.3 Light window actuator: AC220V power supply, surrounded by 9W resistance wire, to ensure the temperature of the upper surface of the light window (50oC~55oC). 2.1.4 Convex lens: with a diameter of 51mm, after adjustment and calibration, it can completely form a ring with a diameter of 51mm without other light beams outside the ring. 2.1.5 Optical window: it is composed of unshielded transparencies and dark boxes. 2.2 Photodetector: 2.2.1 Photodetector: composed of photomultiplier tube, amplification filter, shutter, filter, neutral filter, convex lens, optical window, etc. 2.2.2 Photomultiplier tube: 2.2.2.1 Parameters of photomultiplier tube: voltage: DC 1000V, power supply: input 12V, output 0 ～ - 1200V 2mA 2.2.2.2 Photoelectric system processing: Photoelectric detector is a photomultiplier tube, connected with A/D number template, and processed by multi-stage amplification computer. It can continuously measure the transmittance of the corresponding optical density changing with time, which is five numbers of spectral sensitivity response, similar to the response of the naked eye and the dark current lower than 0.001 uA. The minimum sensitivity of the photomultiplier tube can be obtained by 100% reading 0.5 neutral filter and one ND-2 amplification filter in the optical path. 2.2.3 Magnifying filter: ND-2.0 light transmittance is 0.95%, color temperature of light source A is K=2854. 2.2.4 Shutter: it is used as baffle with corrected light transmittance of 0%. 2.2.5 Filter: 11 compensation filters with optical density of 0.1~1.0 and 2.0. 2.2.6 Neutral filter: ND-0.5, light transmittance 31.7%, light source A color temperature K=2854. 2.2.7 Convex lens: with a diameter of 51mm, the direct beam can be focused into a small strong light spot at the light transmitting plate between the upper and lower dark boxes. 2.2.7 Calibration of optical system: use neutral filter with optical density of 3.0 and wavelength of 550~650nm for detection. 2.2.8 Optical window: it is composed of unshielded transparencies and dark boxes. 5. Overall performance: 5.1 Resolution of light transmittance: 0.0001%; 5.2 Measurement range: 0-100%; Automatic shift during measurement. 5.3 Measurement accuracy: ± 3%; 5.4 Working voltage: AC200-240V 50Hz; 5.5 Ambient humidity: room temperature - 40 ℃ 5.6 Working environment: During the operation of the instrument, strong light and forced air flow shall be avoided. 6. Measurement software: based on Windows XP operation interface and LabVIEW style. Display the transmittance and time curve in both Chinese and English.
Introduction: It is applicable to the determination of the specific optical density of the smoke generated during the combustion of plastics, and the maximum specific optical density is taken as the test result. It is used to evaluate the smoking performance of plastics under specified conditions. It conforms to GB8323.2-2008 Plastics Smoke Generation Part 2: Test Method for Determination of Smoke Density by Single Chamber Method and ISO5659.2-2006 Plastics Smoke Generation Part 2: Determination of Optical Density by Single Chamber Method. The whole instrument is composed of closed test chamber, photometer measurement system, radiation cone, combustion system, igniter, test box, support, temperature measuring instrument and smoke density test software; This instrument is suitable for all plastics and also for the evaluation of other materials (such as rubber, textile coverings, painted surfaces, wood and other materials). It is widely used in the production plants of plastic industry and solid material industry, as well as scientific research and testing institutions.
