Introduction:
Cables, electric The acidity of gas released during combustion from cable or optical cable component materials is tested using a halogen acid gas release tester. In order to determine the acidic cable material, concentration of halogen acid gas volume, PH, conductivity, etc., this testing equipment is designed, processed, and fired in a pris tube furnace. The PH value and conductivity of the gas produced during burning are then monitored. ed and produced in accordance with GB/T 17650 and IEC 60754. The cable's composition
Application:
Wire & Cable
Reference Standards:
IEC 60754-1
- Test on gases evolved during combustion of materials from cables - Part 1: Determination of the amount of halogen acid gas
IEC 60754-2
- Test on gases evolved during combustion of electric cables - Part 2: Determination of degree of acidity of gases evolved during the combustion of materials taken from electric cables by measuring pH and conductivity.
Testing process
1. The test process and assessment must be performed on each sample.
2. Test instruments and arrangements
The test process defined in this section should be performed on the instrument given in detail in Section 5.
3. Heating process
(1) Determination of the heating system
The empty burning boat should be inserted into the quartz glass tube and placed in the position of the cooker in the cooker. The flow velocity of the air can be adjusted to the specified value in 5.6 through the needle valve, and it is continuously supplied throughout the process. Install a thermocouple or other suitable temperature measurement device (corrosion resistance). Before the sample is put into the burning ship, the burning boat should be roughly uniformly heated in advance (40+5) min to achieve the temperature value value of the thermocouple record (800+ 10) ° C, then stay at the temperature (20+1) min. Determining the heating system during the test can ensure the heating rate and temperature required to reach the sample.
(2) The heating process of the sample to be tested
The burning boat that has been put in the sample should be inserted into the quartz glass tube and placed in the position of the cooker cooker. The air flow rate is adjusted to the values specified in 5.6 through the needle valve, and it continues to supply throughout the experiment. The sample should be heated in accordance with the heating system specified in 7.3.1.
Warning: Experiments should take preventive measures, such as: suitable protective clothing with eye masks, because some materials can be ignited quickly, which may cause "backbone" of thermal gas. At the same time, pay attention to the "ultra -pressure" of the system to allow exhaust gas emissions. Preventive measures to prevent "backbone" have been given in Note2 of 5.1.
4. Cleaning process
Immediately after heating, all the bottle used should be removed and rinsed the bottle content into a 1000ml capacity bottle with distilled water. The quartz glass tube after the cooler pipe is cooled, including silicon dioxide wool (if it is used), is cleaned into a capacity bottle, and it is fixed to 1000ml.
5. Measurement of halogen content
(1) White test
Before testing the sample, a blank test should be performed and the experimental process given in 7.3.2, but the sample is not put in the burning boat. After cooling to the ambient temperature, the 200ml solution is put into the cone -shaped bottle through the appropriate amount of solution.
a) About 4ml concentrate;
b) 20ml of silver nitrate of 0.1m, take the amount of liquid pipes;
c) About 3 ml of nitrobenzene, toluene or isopreyol;
Shake the contents to achieve gathering, and to form coating silver by reaction. Add 1ml140% (weight/volume) to the entire mixture to the entire mixture, a three -cost iron sulfate solution and a few drops of 6m nitric acid. The solution is then dripped by the 0.1m ammonium thiocyanic acid, and shakes violently at the same time. The end point of the titration is the last -the drop solution becomes red. Record the volume A of the 0.1m ammonium thiosiocyanate solution.
Features:
1. This testing apparatus has an optimal construction, a logical layout, and is simple to use.
2. Stainless steel is used to make every fixture.
3. The tube-type furnace has an effective length of 500 to 600 mm, an inner diameter of 40 to 60 mm, and an adjustable electric system.
4. Contains a thermocouple that was imported from the US.
5. The combustion boat has dimensions of length 45 to 100 mm, width 12 to 30 mm, and depth 5 to 10 mm.
6. The range for testing electrical conductivity is 0.01 to 100 uS/mm.
7. The temperature of the tube furnace is controlled by an electronic temperature control system.
8. Has two gas collection bottles on board.
9. Contains a conductivity and PH value detector, as well as an electrode and an electronic display.
10. Silicon dioxide fire hose is used in air flow meters to guard against corrosion caused by gas.
11. Air filter with activated carbon: pass air through the filter.
12. The silicone is used to dry the source of the air.
13. Pyrex pipeline: To prevent damage to the pipeline, users can just insert a sample into the Prius tube.
14. System for the combustion boat to move automatically for more intelligent testing.
15. The switching of the mode: mode switch (two test methods to choose from, IEC 60754-1 & IEC 60754-2).
16. The temperature alarm system: prevent overheating by controlling the furnace temperature.
17. IEC 60754-1 and IEC 60754-2 time measuring devices are timers.
18. Drawer: utilized to keep a portion of the box (such as conductivity meter, PH meter, etc.)
19. A temperature gauge that displays the furnace's internal temperature.
20. Permanent magnetic stirrers are used to assess the conductivity of combustion gases.
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