According to GB/T17651.1~2 and IEC61034-1~2,the first parts of
"test device" and second part of "test steps and requirements" for
the determination of smoke density of cables or optical cables
under specific conditions. The determination of smoke density is an
important aspect of assessing the combustion characteristics of
cable or cable, which is related to the evacuation of the personnel
and the determination of the proximity of the fire extinguishing.
This instrument is mainly used to determine the smoke concentration
of cables and optical cables under specific conditions and to
verify the smoke density. Under the conditions of flame burning or
flameless combustion, the transmittance is used as a way to compare
different cables or cables under specific conditions.
Feature
This instrument relates to three aspects of mechanical, optical and
electronic expertise. It is a mechanical and electrical integration
product. It has the advantages of reasonable structure, stable
performance and easy operation. WINDOWS XP operation interface,
LabVIEW style and perfect security mechanism. During the test of
real-time display measurement results and dynamically draw a
perfect curve (through the display rate and time curve), the data
can be stored permanently, read and print output, can directly
print the report.
Measurement software: It is main data of smoke and light density,
specific optical density, smoking rate, maximum smoking rate and
average smoke density can be tested at WINDOWS XP+VB6.0 operation
interface. It also has the operating interface of calibration,
editing, testing, parameter adjustment and so on. The program uses
computer automatic control, collection, recording and result
settlement.
Principle
The light measurement system for the smoke density of cable or
optical cable under specific conditions is composed of light
source, silicon photocell, light source receiver and computer
system. The light generated by the light source passes through the
smoke density Laboratory of 3M * 3M * 3M, forming a uniform beam
with a diameter of 1.5m + 0.1M on the wall opposite the light
source. The photocell installed at the center of the beam detects
the intensity of the beam from the light source. When the
combustion chamber due to combustion of cables to produce a lot of
smoke, the smoke of photoelectric absorption, achieve the silicon
photocell beam intensity is weakened by the computer system for
data processing, we can calculate the relative to the initial 100%
with linear response light transmittance.
The design of the combustion chamber, two ways for customers to
choose: the first one uses the brick wall, Our company provide the
design scheme, send professional engineers to guide the
construction site; second with suitable material is fixed on the
angle iron bracket and the whole cube combustion chamber.
Equipment composition
The whole instrument is composed of closed test box, photometer
measuring system, alcohol disk, combustion system, igniter, test
box, cable bracket, temperature measuring instrument and smoke
density testing software. The circuit is developed by single chip
microcomputer with high technology content and stable performance.
This instrument is suitable for all cables. It is widely used by
production plants of wire and cable industry and research and test
units. The test box is a test cube with a volume of 27m3.
Detailed technical parameters
| Combustion chamber | Internal size: 3M x 3M x 3M total of 27 cubic meters. It can be
used as a brick wall structure, as well as a steel structure, by
the customer. |
| Flash Ranging Equipment | A: Light source imported quartz halogen lamp: nominal power 100W,
nominal voltage: 12V, nominal return amount: 2000 - 3000Lm B: Acceptor: for silicon photocell, the transmittance of 0% is
passed without light and the transmittance rate is 100% light
without occlusion. |
| Standard fire source | A: The fire source is 1.0L alcohol B: Alcohol tray: stainless steel, bottom 210 x 110mm |
| A mixture of smoke | The smoke is evenly distributed in the combustion chamber by using
a desktop fan. |
| Blank test | Burning alcohol lamp makes the combustion chamber temperature reach
25±5℃. |
| Temperature measuring device | The height of the inner surface is 1.5M from the ground and the
temperature sensor is installed in the place where the wall is
0.5M. |
| Contains the measuring software containing transmittance, output
curves and reports |
| A computer (printer provide for yourself) |
| Power | 220V, 4KW. (it should indicate the total power of the device) |
| Smoke Density | 0 - 924 six gear automatic shift |
| Measuring Range | 0.0001—100% |
| Measurement Accuracy | ±3% |
| Working Voltage | 200—240V 50Hz |
| Ambient Temperature | Room Temperature—40℃ |
| Relative temperature | ≤85% |
| Working Environment | It is necessary to avoid direct light and no forced air flow during
the operation of the instrument. |
Other parameters and introduction
a.The front door is equipped with windows and opaque visions that
can block the inspection activities.
b.The bottom of the square box is equipped with an automatic
ignition device, and the top is installed with the internal
pressure regulating device of the box.
c.Light source: incandescent lamp for 12V, light wavelength from
400 to 750nm.
d.Acceptor: for silicon photocell, the transmittance of 0% is
passed without light and the transmittance rate is 100% light
without occlusion.
e.Combustion system: composed of pressure regulating valve, filter,
regulating valve flowmeter and burner.
f.Burner: made up of an igniter and an alcohol disk and placed in
the center of the sample.
Main configuration
| Desktop (including display screen) | 1 sets |
| Opaque template | 1 |
| Spare light bulb | 2 |
| Instructions | 1 |
| Certificate | 1 |
| Calibrated lens | 2 |
| Printers | 1 |
| Analysis software | 1 |
| Activity sluice | 1 |
