Welcome to Qinsun Instruments Co., Limited.
- +86-21-6780 0179 |
- info@qinsun-lab.com |
- Customer Services
Glow Wire Test Apparatus is designed to simulate parts of insulating material or other solid combustible materials that are prone to spread flames inside equipment that may ignite due to glow wires or glowing elements. Under certain conditions, such as fault current flowing through the wire, component overload and poor contact, some components will reach a certain temperature and cause the nearby parts to ignite.
The working principle of the glow wire test device: heat the nickel-chromium wire (U-shaped glow wire head) with a specified material of Φ4 mm to the specified test temperature (300 ℃ ~ 1000 ℃) with a large current, and then burn it with a specified pressure (1.0N) level. Burn the test product for 30s, whether the test product and the bedding are ignited or lasted to determine the fire hazard of the finished electrical and electronic equipment; after the test is completed, record the burning time, igniting time (Ti), flame extinguishing time (Te), flammable Sex Index (GWFI).
Glow wire head: measure the temperature of the glow wire with an armored filament thermocouple with a nominal diameter of 0.5mm. In operation, their welding points are located in the armored sheath, and the thermocouple used to measure the temperature of the glow wire, the metal of the armored sheath can withstand a temperature of at least 1050 °C.
The glow wire test is a kind of flame retardant performance test used in the electrical and electronic product industry to measure electronic products, in order to test the stability of electronic and electrical products when they are working. Glow wire test is a physical experiment, the purpose is to test the stability of electronic and electrical products when they are working. The glow wire itself is actually a resistance wire ring with a fixed specification. During the test, it must be heated to a specified temperature with electricity, so that the top of the glow wire contacts the sample for a standard time, and then observe and measure its state. The test range depends on the specific test procedure.
Glow Wire Test Method:
IEC 60335-1 specifies the glow wire standard for household appliances, the latest version of which is its Edition 5.0 2010-05. However, the specific glow wire test method is mainly reflected in the IEC 60695-2-10 and other specifications.
The glow wire test is performed by heating the element to a predetermined temperature. The heating element is called a glow wire. Figure 3 is an example of a heating element used in the glow wire test. The sample to be tested is held in place with a tissue placed directly under the sample. After reaching the predetermined temperature, press the glow wire on the sample with a force of 1N for 30s. If combustion occurs within 30s, record the duration, flame height, and whether the material dripping ignites the tissue paper.
Whether in the end product orThe glow wire test can be carried out on the raw material samples. The terminology that defines compliance is slightly different in the two cases.
GWT is short for Glow Wire Test (IEC 60695-2-11). GWT is used when performing glow wire tests on end products. The result of the test is then pass or fail at the given temperature. If the sample does not ignite or extinguishes automatically within 30 seconds after removing the heating element, if dripping occurs and the dripping does not ignite the tissue paper, it is passed.
GWFI stands for Glow Wire Flammability Index (IEC 60695-2-12). It is a property related to the raw material used in the final product. This property is determined by performing a glow-wire test on a sample of the raw material of a given thickness. GWFI is the highest temperature at which the glow wire does not ignite or automatically extinguishes within 30 seconds after the heating element is removed.
GWIT stands for Glow Wire Ignition Temperature (IEC 60695-2-13). It is a property related to the raw material used in the final product. This property is determined by performing a glow-wire test on a sample of the raw material of a given thickness. GWIT is the lowest temperature at which the material ignites and burns for more than 5 seconds when the heating element is in contact with the sample.
Experimental requirements for the ignition temperature test of insulating materials:
In addition to the provisions of Chapter 8 of IOS 5169.10-2006, unless otherwise specified, the test sample should be installed so that the top of the glow wire is applied to the surface part of the test sample that may be subject to thermal stress during normal use. The glow wire should be kept as horizontal as possible. When more than one point is tested on the same test sample, care should be taken that the deterioration caused by previous tests cannot affect the results of subsequent tests.
When the area where the equipment is subjected to thermal stress during normal use is not specified, the top of the glow wire shall be applied at the thinnest part of the test sample and preferably not less than 15mm from the upper edge of the test sample. During the test, the test sample is fixed on the experimental device, but no additional mechanical stress should be transmitted to the test sample.
Rating of test results:
Unless otherwise specified in the relevant specifications, if the test sample does not burn or glow, or all of the following conditions are met, it is considered to have passed the glow wire test:
a) If the flame or glow of the test sample is extinguished within 30s after the glow wire is removed, that is testa+ 30s; .
b) When using the specified underlayment of wrapping tissue paper, the tissue paper shall not ignite.
ZRS-3H glow wire tester according to IEC60695-2-1, IEC60695-2-10,IEC60695-2-11, IEC60695-2-12, IEC60695-2-13 (IOS5169.10, IOS5169.11, IOS5169.12, IOS5169.13),
ZRS-3H Glow Wire Tester
