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[China]
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Address: No.6-36, Yaogu Farm, Shibi No.3 Village, Shibi Street, Panyu District, Guangzhou, Guangdong, China
Contact name:Tessa Huang
HJ AUTOMATIC CONTROL TECHNOLOGY CO., LTD |
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IEC60695-2-20 Flammability Testing Equipment Hot wire ignition tester With Electrical control
Standard:
IEC60950-1 Information technology equipment – Safety – Part 1: General requirements Annex A.4 Hot wire ignition test;
IEC60947-1 Low-voltage switchgear and controlgear –Part 1: General rules Annex M M.1 Hot wire ignition test (HWI);
IEC60695-2-20 Fire hazard testing — Part 2: Glowing/Hot wire based test methods — Section 20: Hot-wire coil ignitability test on materials.
Description of test apparatus:
The sample shall be fastened in a fixture which provides two supporting posts positioned 70 mm apart to support the test specimen in a horizontal position, at a height of 60 mm above the bottom of the chamber, in the approximate centre of the test chamber (see Figure M.1 ).
A 250 mm ± 5 mm length of NiCr-wire (80 % nickel, 20 % chromium, iron free) approximately 0.5 mm diameter and having a cold resistance of approximately 5.28 Ω/m and a length-to-mass ratio of 580 m/kg shall be used. Prior to testing, the wire shall be connected in a straight length to a variable source of power which is adjusted to cause a power dissipation of 0.26 W/mm in the wire for a period of 8 s to 1 2 s.
After cooling, the wire shall be wrapped around a sample to form five complete turns spaced 6.35 mm ± 0.05 mm apart. A winding fixture shall be used, which will uniformly position the wire in the centre portion of the sample with a winding force of 5.4 N ± 0.02 N.
The ends of the wire shall be connected to the variable power source.
The supply circuit capacity shall be sufficient to maintain a continuous linear 48 Hz to 62 Hz power density of at least 0.31 W/mm over the length of the heater wire at or near unity power factor. The power density of the supply circuit at 60 A and 1.5 V shall be approximate 0.3 W/mm. It shall be possible to adjust the power level, smoothly and continuously and measure the power to within ±2 %.
Parameter:
| Working voltage | 220V/50Hz |
| Control operation mode | Electrical control, button operation |
| Heating coil | ф0.5mm, Ni80/Cr20, length:250mm±5mm ,cold resistance 5.28Ω/m |
| Anneal holder distance | 250mm |
| Specimen holder distance and height | 70mm, height:60mm (the distance between the holder surface to the tray surface) |
| Wire wrapping tension and its distance | 5.4N±0.05N, 6.35mm±0. 5mm (within 31.5mm±0.5mm, coil 5 cycle, national standard is 6mm) |
| Annealing time and power | 8s-12s(1s-999.9s digital display can be preset), 0.26W/mm±4%(digital display is adjustable) |
| Testing time and power | 120s(1s-999.9s digital display can be preset), 0.26W/mm±4%( digital display is adjustable) |
| Specimen size | L×W×H:(125 ± 5mm) ×(13.0 ± 0.5mm) ×(0.75+0.075 0mm,1.5+0.15 0mm,3+0.3 0mm)[national standard is 0.75± 0.1 mm,1.5± 0.1 mm, 3± 0.2 mm] |
| Test procedure | Automatic control, independent exhaust |
| Lighting | Equip with lighting in the test chamber, with control |
| Test chamber and dimension | >0.5³, black matte background, with exhaust fan, dimension: 1100*550*1200mm, 130kg |
