Test system for smoke density of wire and cable combustion

Comply with GB/T17651.1-2 and IEC61034-1-2 "Measurement of Smoke Density of Cables and Optical Cables Burning under Specific Conditions". Used to measure cables and optical cables under specific conditions

The concentration of smoke released during combustion.

1、 Characteristics

This instrument involves professional knowledge in mechanical, optical, and electronic fields. It is an integrated mechatronics product with advantages such as reasonable structure, stable performance, and easy operation;

Windows XP operating interface, LabVIEW style, and comprehensive security mechanism. Real time display of measurement results and dynamic drawing of perfect curves during testing, data can

By permanently saving, retrieving, and printing out, reports can be directly printed. See Figures 1 and 2

2、 Principle

The smoke density optical measurement system for burning cables or optical cables under specific conditions consists of a light source, a silicon photocell receiver, and a computer system. The light generated by the light source passes through 3m × 3m

× A 3m smoke density laboratory forms 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 light source

The intensity of the beam. When a large amount of smoke is generated in the combustion chamber due to the burning of cables or optical cables, the smoke absorbs a portion of the photoelectric energy and weakens the beam intensity of the silicon photocell,

By processing the data through a computer system, it is possible to calculate the transmittance It with a linear response relative to the initial value of 100%.

2、 Design of combustion chamber (see Figure 3)

There are two ways for customers to choose from: the first is to use brick masonry walls, and our company has provided a design plan and sent professional engineers to provide on-site construction guidance; The second method is to use suitable materials to fix

Fixed on an angle iron bracket to form the entire cube combustion chamber.

3、 Equipment composition

1. Combustion chamber: Internal dimensions: 3M x 3M x 3M, totaling 27 cubic meters. It can be a brick wall structure or a steel plate structure, chosen by the customer

1. Optical measuring device: A. Imported quartz halogen lamp with light source: nominal power: 100W, nominal voltage: 12V, nominal light flux: 2000-3000Lm

B. Receiver: It is a silicon photocell, with a transmittance of 0% indicating no light passing through, and a transmittance of 100% indicating complete light passing through without obstruction.

2. Standard ignition source: A. The ignition source is 1.0L alcohol

B. Alcohol tray: stainless steel, bottom surface: 210x110mm, top surface: 240x140mm, height 80mm

3. Smoke mixing: Use a desktop fan to evenly distribute smoke in the combustion chamber.

4. Blank test: Burn the alcohol lamp to reach a temperature of 25 ± 5 ℃ in the combustion chamber.

5. Temperature measuring device: A temperature sensor is installed at a height of 1.5M from the ground and 0.5M from the wall on the inside of the door.

6. Including a set of transmittance measurement software that can output curves and reports.

7. Including one computer (provided by the printer)