IEC 61034 Smoke Density Measuring Device for Cable Optical Cable
Burning Test Machine
1. Introduction
It meets the requirements of GB/T17651.1~2 and IEC61034-1~2
“Determination of Smoke Density of Burning Cables or Fiber Optic
Cables under Specific Conditions” Part 1 “Test Equipment” and Part
2 “Test Procedures and Requirements”. Measurement of smoke density
is an important aspect of evaluating the burning characteristics of
cables or optical fiber cables, which is related to evacuation of
personnel and judging the proximity to the fire. The instrument is
mainly used to measure the smoke concentration and verify the smoke
density of cables and fiber optic cables when they burn under
specific conditions. Under flaming or flameless burning conditions,
transmittance is used as a measurement method to compare the
burning performance of different cables or fiber optic cables under
specific conditions.
2. Features
The instrument involves three major specialized knowledge in
mechanics, optics and electronics. It is a mechatronic product with
reasonable structure, stable performance and easy operation; it
adopts Windows XP operation interface, LabVIEW style and perfect
safety mechanism. During the test, the measurement results can be
displayed in real time, and the perfect curve (showing
transmittance and time curve) can be drawn dynamically. Data can be
permanently saved, read and printed, and reports can be printed
directly.
Measurement software: Windows XP + VB6.0 operating interface, can
test the main data: smoke optical density, relative optical
density, smoke rate, maximum smoke rate, average smoke density and
so on. Also has calibration, editing, testing, parameter adjustment
and other operating interfaces. The program adopts automatic
computer control, acquisition, recording and result settlement.
3. Principle
The smoke density optical measurement system for cable or optical
cable burning under specific conditions consists of a light source,
a silicon photocell, a light source receiver and a computer system.
The light generated by the light source passes through a 3m×3m×3m
smoke density laboratory and forms a uniform beam of light with a
diameter of 1.5m±0.1m on the wall opposite the light source. The
photocell installed in the center of the beam detects the intensity
of the beam from the light source. When a large amount of smoke is
generated in the combustion chamber due to the burning of cables or
optical cables, the smoke absorbs part of the photoelectricity and
the beam intensity of the silicon photocell is weakened. By
processing the data through the computer system, the transmittance
with a linear response relative to the initial transmittance can be
calculated to be 100%.
The design of the combustion chamber adopts two ways for customers
to choose: the first brick wall, our company recommends the design
plan and sends professional engineers to guide the construction on
site; the second is fixed on the angle iron bracket with suitable
materials to form the entire cubic combustion chamber.
4. Equipment composition
The whole instrument is composed of closed test chamber, photometer
measuring system, alcohol plate, combustion system, igniter, test
box, cable bracket, thermometer table and smoke density testing
software; The circuit is developed by single chip microcomputer
with high technical content and stable performance. This instrument
is suitable for all cables, and is widely used in production plants
and scientific research and testing units of wire and cable
industry. The test chamber is a test cube with a volume of 27m3.
5. Detailed technical parameters
| 1. Combustion chamber | inner size: 3M* 3M* 3M, a total of 27 cubic meters.Can be brick
wall structure, also can be steel plate structure, by the
customer's choice. |
2. light measuring device
| A. light source imported quartz halogen lamp: nominal power 100W,
nominal voltage: 12V, nominal light return: 2000-3000LM |
| B. Receptor: silicon photocell, light transmittance of 0% is no
light through, light transmittance of 100% light without blocking
completely through. |
3. Standard ignition source
| A. The ignition source is 1.0L alcohol |
| B. Alcohol plate: stainless steel, bottom side 210*110mm, Top surface 240*140mm, height 80mm |
| 4. Mixing of smoke | the use of desktop fans to make the smoke evenly distributed in the
combustion chamber. |
| 5. Blank test | burn the alcohol lamp to make the temperature of the combustion
chamber reach 25±5ºC. |
| 6. temperature measuring device | in the door surface from the ground height of 1.5m, A temperature sensor is installed 0.5M away from the wall. |
| 7. including a set of transmittance measurement software, can
output curves and reports. |
| 8. including a computer (printer) |
| 9. power | 220V, 4KW.(The total power of the equipment should be indicated) |
| 10. (smoke density) 0-924 six automatic shift gear |
| 11. Measuring range | 0.0001 -- 100%; |
| 12. measuring accuracy | + 3%; |
| 13. Working voltage | 200-240V 50HZ; |
| 14. ambient temperature | room temperature - 40ºC |
| 15. relative temperature | ≤85%; |
| 16. working environment | when the instrument is running, should avoid direct light, and
there is no forced air flow phenomenon. |
Other parameters and introduction
1. the front door is installed with a window and can block the
inspection of the activities of the opaque screen
2. The bottom of the square box is provided with an automatic
ignition device, and the top is provided with an internal pressure
regulating device
3. light source: 12V incandescent lamp, optical wavelength of 400 ~
750nm
4. Receptor: for silicon photocell, light transmittance 0% for no
light through, light transmittance 100% light without blocking
completely through.
5. Combustion system: composed of pressure regulator valve, filter,
regulating valve flowmeter and burner.
6. Burner: composed of igniter and alcohol plate, placed in the
center of the sample.
