Computer Controlled 27m3 Smoke Density Chamber Test For Wire And Cable

IEC 61034 Computer Controlled Wire And Cable Smoke Density Test Chamber / Testing Equipment

Product Introduction:

The 27 cubic meter wire and cable smoke density test chamber is developed according to the IEC 61034, BS 6853, GB/T17651.1~2 test standards, and is mainly used for smoke density performance testing of wires, cables and optical cables. During the test, when smoke is generated, the light path is blocked by smoke, and the optical transmittance is continuously changed, thereby obtaining the minimum transmittance value and the test time to reach the minimum transmittance.

Standard:

• BS 6853 Appendix D
• GB/T 17651-1&2:1998
• IEC 61034-1&2: 2005

Working principle:

The optical measurement system of smoke density of cables or optical cables 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, forming a uniform beam of 1.5m±0.1m in diameter 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 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 intensity of the beam reaching the silicon photocell is weakened. By processing the data through the computer system, the transmittance It with a linear response relative to the initial 100% can be calculated.

IEC 61034 wire and cable smoke density test chamber's composition:

The entire instrument consists of a closed test chamber, a photometer measurement system, an alcohol tray, a combustion system, an igniter, a test box, a cable bracket, a temperature measuring instrument and a smoke density test software; the circuit is developed using a single-chip microcomputer, with high technical content and stable performance. This instrument is suitable for all cables and is widely used by production factories and scientific research and testing units in the wire and cable industry. The test chamber is a test cube with a volume of 27m3.

Feature:

1. Smoke density test chamber:
       a. The internal dimensions of the box are 3000mm X 3000mm X 3000mm, and the total internal volume is 27 cubic meters;
       b. The interior of the box is made of SUS 304 stainless steel, and the exterior is iron spray-coated. Since the combustion test process will continuously release corrosive gases, the inner wall of the box is treated with dark Teflon, which can not only resist the erosion of corrosive gases, but also will not cause the failure of the test results due to reflection during the test.
       c. The test box is equipped with a laboratory door and an observation window, so that users can observe the state in the combustion chamber.
       d. Transparent glass plates are installed on the left and right walls, and light sources and optical receiving devices can be installed on both sides;
       e. Several ventilation holes are opened on the part of the box close to the ground to ensure the balance of atmospheric pressure inside and outside the box

2. Smoke density test  chamber measurement and data collection part:
       a. Prepare a desktop fan to evenly stir the smoke in the combustion chamber;
       b. The top of the box is equipped with a centrifugal fan to remove the smoke generated by the test;
       c. Surface ignition device, remote ignition to ensure the safety of testers;
       d. Prepare combustion test bracket and stainless steel alcohol tray;
       e. The light source is an imported light source. The test light source adopts a constant current source control and has higher stability.
       f. The light source accepts silicon photocells, which are equipped with cosine calibration devices and color filters. Through this measure, a higher degree of human eye matching can be achieved.
       g. Standard transmittance, using 19 cabinet floor installation method, built-in touch screen computer and printer.

3. Optical technical parameters of the smoke density test chamber:
       a. The light source is controlled by a constant current source. Compared with the constant voltage mode, the data is more stable and reliable.
       b. The optical gear can be automatically obtained, with a general accuracy of 0.01%;
       c. Matching error: f1≤4%, the overall linear accuracy is 1%. ​