DONGGUAN DAXIAN INSTRUMENT EQUIPMENT CO.,LTD |
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1, Compliant with standards: Meet the requirements of GB8323.2-2008
"Plastics Smoke Generation Part 2: Single Chamber Method for
Determining Smoke Density" and ISO5659.2-2006 "Plastics Smoke
Generation Part 2: Single Chamber Method for Determining Optical
Density" test standards.
2, Scope of application: Suitable for measuring the specific
optical density of smoke generated during plastic combustion, and
taking the maximum specific optical density as the test result. It
is used to evaluate the smoking performance of plastics under
specified conditions.
The plastic smoke density tester is a new type of testing equipment
developed based on the technical conditions specified in the
standard GB/8323.2-2008 and ISO5659-2 "Plastic smoke generation -
Part 2: Single chamber method for measuring smoke density".
3, Main parameters: 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 using a microcontroller, with high technical
content and stable performance. This instrument is suitable for all
plastics and can also be used for the evaluation of other materials
(such as rubber, textile coverings, painted surfaces, wood, and
other materials). It is widely used in production factories and
research and testing units in the plastic and solid materials
industries.
1. Test box: The front door is equipped with a window and an opaque
sunshade that can block the movement of the window.
The bottom of the square box is equipped with explosion-proof
aluminum foil to prevent overpressure. It is a safety bursting disc
composed of 0.04mm thickness, 405mm length, 200mm width, and a
total area of 81000mm². The box is equipped with an internal
pressure regulating device (Figure 2).
Light window: There are two Ø 75mm light windows on the top and
bottom, and a 9W circular electric heater is installed below the
light window to ensure the temperature of the upper surface of the
light window (50℃~55℃ is suitable) to minimize the smoke
concentration on the surface. The upper light window is located at
the top of the test box, and an 8mm thick optical platform is
installed around the light window outside the test box. The optical
platform is fixed with a Ø 15mm metal rod that can connect the
fixed platform and the test box.
Internal dimensions: height 914mm x width 914mm x depth 610mm
External dimensions: height 16800mm, width 14500mm, depth 850mm
(this dimension is for reference only)
Material: Composed of three layers: outer layer of 1.5mm thick
steel plate, high-temperature electrostatic baking off white paint,
middle layer of 60mm thick asbestos layer, inner layer of 1.2mm
thick USU304 stainless steel, high-temperature electrostatic baking
black paint, easy to clean.
Air inlet and exhaust outlet: The air inlet is installed on the top
of the test box, with a diameter of Φ 65mm, controlled by a flanged
solenoid valve in both closed and closed states; The exhaust port
is installed at the bottom on the left, with a diameter of Φ 80mm,
controlled by a flanged solenoid valve in both closed and closed
states, and equipped with an exhaust fan.
2. Optoelectronic measurement system: composed of power supply,
photomultiplier tube, amplifying transparent film, shutter, filter,
neutral transparent film, lens, optical system dark box, light
source, and light window heater.
Light source: composed of a 6.5V incandescent lamp, a transformer
providing power (input 220V output 6.5V), and a variable resistor.
Installation: The light bulb is installed in an opaque dark box at
the bottom of the test box, consisting of a light source, convex
lens, light window heater, and optical window.
Light window actuator: powered by AC220V, surrounded by 9W
resistance wire, to ensure the temperature of the surface of the
light window (50℃~55℃) is appropriate.
Convex lens: With a diameter of 51mm, it has been adjusted and
calibrated to form a ring with a diameter of 51mm without any other
beams of light outside the ring.
Optical window: composed of unobstructed transparent film and dark
box.
Photodetector: composed of photomultiplier tube, amplification
filter, shutter, filter, neutral filter, convex lens, optical
window, etc.
Parameters of photomultiplier tube: voltage: DC 1000V, power
supply: input 12V, output 0-1200V2mA
Optoelectronic system processing: The photodetector is a
photomultiplier tube connected to an A/D number template and
processed by a multi-stage amplification microcomputer. Can
continuously measure the transmittance of the corresponding optical
density over time, which is 5 quantities of spectral sensitivity
response, similar to the response of the naked eye and dark current
below 0.001uA. The minimum sensitivity of a photomultiplier tube
can be 100% read through a 0.5 neutral filter and an ND-2
amplification filter on the optical path.
Amplification filter: ND-2.0 with a transmittance of 0.95% and A
light source color temperature K=2854.
Light gate: used for baffle and correction of 0% transmittance.
Filter: To compensate for the filter, there are a total of 11
pieces with optical densities ranging from 0.1 to 1.0 and 2.0.
Neutral filter: ND-0.5, transmittance 31.7%, A light source color
temperature K=2854.
Convex lens: With a diameter of 51mm, the direct beam of light can
be focused into a small strong spot at the transparent plate
between the upper and lower dark boxes.
Calibration of optical systems: Detection using a neutral filter
with an optical density of 3.0 and a wavelength of 550-650nm.
3. Radiation cone: composed of heating elements with a rated power
of 2600W, capable of providing 10KW/㎡~50KW/㎡ radiation intensity at
the center of the sample surface. When testing the irradiance at
two other positions 25mm away from the center of the sample, the
irradiance at these two positions must not be lower than 85% of the
irradiance at the center of the sample.
Radiation cone heater: powered by an independent power source, with
a single-phase isolation transformer power of 3000W. The
temperature control adopts thyristor control with fast cycle, which
can stabilize the temperature at ± 2 ℃.
Heat flow meter: A flat area with a range of 50kw/㎡ and a receiving
radiation area diameter of 10mm. The surface is coated with matte
black and cooled by water cooling.
4. Igniter: The igniter nozzle is composed of Φ Made of 4.0mm
aperture copper tube, the flame length and horizontal measurement
are 30mm.
Gas supply system:
Gas source: Purity of 95%, propane and air mixed gas, pressure of
170Kpa
Propane flow meter: 1-100cm³/min
Air flow meter: 5~500cm³/min
Overall performance:
Translucency resolution: 0.0001%;
Measurement range: 0-100%; Automatically shift gears during
measurement.
Measurement accuracy: ± 3%;
Working voltage: AC200-240V 50Hz;
Environmental humidity: room temperature -40 ℃.
Working environment: When the instrument is running, it should
avoid direct sunlight and there should be no forced air flow.
Measurement software: Based on Windows XP operating interface and
LabVIEW style. Display transmittance versus time curve. Provide a
Chinese and English interface, as well as a Chinese and English
instruction manual.