Plastic Smoke Density Tester，It Is Used to Evaluate the Smoke Emission Performance of Plastics Under Specified Conditions.

The plastic flammability smoke density tester is a new type of testing equipment for determining smoke density developed in accordance with the technical conditions stipulated in the standards GB/8323.2-2008 and 1SO5659-2 "Plastic Smoke Generation - Part 2: Test Method for Smoke Density by Single-chamber Method". These standards are applicable to the determination of the specific optical density of smoke produced when plastics are burning. And take the maximum specific optical density as the test result. It is used to evaluate the smoke emission performance of plastics under specified conditions.
It complies with GB8323.2-2008 "Plastics - Smoke Generation - Part 2: Determination of smoke Density by Single-chamber Method" and 1SO5659.2-2006 "Plastics - Smoke Generation - Part 2: Determination of light density by Single-chamber Method"
"Degree" test standard.
The entire instrument consists of a closed test chamber, a photometer measurement system, a radiation cone, a combustion system, an igniter, a test box, a bracket, a temperature measuring instrument, and smoke density testing software. The circuit is developed with a single-chip microcomputer, featuring high technical content and stable performance. This instrument is suitable for all plastics and can also be used for the assessment of other materials (such as rubber, textile coverings, painted surfaces, wood and other materials), and is widely used in production plants and scientific research and testing units in the plastic industry, solid materials industry.
Test chamber: (See Figure 1)
(See Figure 1
1.1 The front door is equipped with a window and an opaque light shield that can block the movement of the window.
Internal pressure regulating device (see Figure 2
1.2 The bottom of the square box is equipped with anti-overpressure burst aluminum foil sheets, which are composed of safety burst sheets with a thickness of 0.04mm, a length of 405mm, a width of 200mm, and a total area of 81000mm. The box is also equipped with 1.3 light Windows: There are two Φ75mm light Windows at the top and bottom. Below the light Windows, there is a 9W annular electric heater to ensure the temperature of the upper surface of the light Windows (50℃ to 55℃ is appropriate) to minimize the smoke concentration on that surface. The upper light window is located at the top of the test chamber. Around the light Windows outside the test chamber, an 8mm thick optical platform is installed. The optical platform is fixed with a metal rod of Φ15mm that can connect the fixed platform and the test box. 1.4 Internal dimensions: Height 914mmX width 914mmX depth 610mm
1.5 Material: Composed of three layers: The outer layer is a 1.5mm thick steel plate with high-temperature electrostatic baking off-white paint; the middle layer is made up of a 60mm thick asbestos layer; the inner layer is a 1.2mm thick SUS304 stainless steel with high-temperature electrostatic baking black color
The paint is easy to clean.
1.5 Air inlet and exhaust port: The air inlet is installed on the top of the test box, with a diameter of Φ65mm, and is controlled by an electromagnetic valve with a flange to close and shut. The exhaust port is installed at the bottom left, with a diameter of Φ80mm.
The closed and closed states are controlled by an electromagnetic valve with a flange and are equipped with an exhaust fan.
Ii. Photoelectric Measurement System: It is composed of power supply, photomultiplier tube, magnifying light-transmitting sheet, light gate, filter, neutral light-transmitting sheet, lens, optical system dark box, light source, and light window heater
2.1 Light Source:
2.1.1 Light source: It is composed of a 6.5V incandescent lamp, a transformer providing power (input 220V, output 6.5V), and a variable resistor.
2.1.2 Installation: The bulb is installed in an opaque dark box at the bottom of the test chamber, which consists of a light source, a convex lens, a light window heater, and an optical window.
2.1.3 Light window holder: Powered by AC220V, it is made of 9W resistance wire wound around to ensure that the temperature of the upper surface of the light window is (50℃ to 55℃). 2.1.4 Convex lens: With a diameter of 51mm, after adjustment and calibration, it completely forms a 51mm diameter ring without any other light beam outside the ring. 2.1.5 Optical window: Composed of an unobstructed light-transmitting sheet and a dark box.
2.2. Photodetector
2.2.1 Photodetector: It is composed of a photomultiplier tube, amplification filter, light gate, filter, neutral filter, convex lens, optical window, etc.
2.2.2 Photomultiplier tube:
2.2.2.1 Parameters of the photomultiplier tube: Voltage: DC1000V, Power supply: Input 12V, output 0 to -1200V2mA
2.2.2.2 Photoelectric System Processing: The photodetector is A photomultiplier tube, which is connected to the A/D number template and processed by a multi-stage amplification microcomputer. It can continuously measure the transmittance of the corresponding optical density varying with time, which is five quantities of spectral sensitivity response, similar to the response of the naked eye and the dark current is less than 0.001uA. The minimum sensitivity of the photomultiplier tube can 100% read out the results obtained by 0.5 neutral filter and one ND-2 amplification filter on the optical path.
2.2.3 Magnification filter: ND-2.0 with A light transmittance of 0.95% and a light source color temperature K=2854.
2.2.5 Filters: As compensation filters, there are 11 filters with optical densities ranging from 0.1 to 1.0 and 2.0.
2.2.4. Light gate: It is used as a baffle to correct the light transmittance to 0%.
2.2.6 Neutral filter: ND-0.5, light transmittance 31.7%, A light source color temperature K=2854.
2.2.7 Convex lens: With a diameter of 51mm, it enables the direct light beam to be focused into a small strong spot at the light-transmitting plate between the upper and lower dark boxes.
2.2.7 Calibration of the optical system: Use a neutral filter with an optical density of 3.0 and a wavelength of 550 to 650nm for detection.
Iii. Radiation Cone
2.2.8 Optical window: Composed of an unobstructed light-transmitting sheet and a dark box. 3.1 Radiation cone: Composed of a heating element with a rated power of 2600W, it can provide a radiation intensity of 10KW/m to 50KW/m at the center of the sample surface. When testing the radiometric illuminance at two other positions 25mm away from the sample center, the radiometric illuminance at these two positions must not be lower than 85% of the radiometric illuminance at the sample center.
3.2 Radiation cone heater: Powered by an independent power supply, it is equipped with a single-phase isolation transformer with a power of 3000W. The temperature control adopts a thyristor with a fast cycle, and the controlled temperature can be stably maintained within ±2℃.
3.3 Heat flow meter: With a measurement range of 50kw/m, it covers a flat area with a radiation receiving area diameter of 10mm, its surface coated with matte black, and uses water cooling for temperature reduction.
3.4 Igniter: The nozzle of the igniter is made of copper tubes with a diameter of Φ4.0mm. The flame length is 30mm when measured horizontally.
Iv. Gas Supply System
4.1 Gas source: A mixture of propane and air with a purity of 95%, and a pressure of 170Kpa
4.2 Propane flowmeter: 1 to 100cm²/min
V. Overall Machine Performance
Light transmittance resolution: 0.0001%;
3. Measurement accuracy: ±3%;
5. Environmental humidity: Room temperature -40℃
4.3. Air flowmeter: 5-500cm²/min 2. Measuring range: 0-100% It automatically shifts gears during measurement. 4. Working voltage: AC200-240V 50Hz;
6. Working environment: When the instrument is in operation, direct strong light should be avoided and there should be no forced air flow.
Vi. Measurement Software; Based on the WINDOWS XP operation interface and LabVIEW style. Display the transmittance and time curve. It features both Chinese and English interfaces and provides instruction manuals in both languages.
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