FEATURES:
Hot-wire coil ignition test adopts the specific size (ф0.5mm length: 250mm) and specific material (Ni80/Cr20) of heater strip which is pre-annealed with required heating power (0.26W/mm) and time (8s～12s). Then coil heater strip on the specimen for 5 cycles according to certain wire wrapping tension (5.4N) and certain wire wrapping distance (6.35mm). Next, take the specimen with wrapping heater strip to test until 120s under the stipulate heating power (0.26W/mm) the users can judge the fire risk according to whether the specimen ignite and the ignite time.
Technical parameters:
| Parameter\ model | MT-HWI-1E | |
| Conforms to standard | IEC60695-2-20, GB4943 | |
| Heating coil | ф0.5mm，Ni80/Cr20，length:250mm±5mm ,cold resistance5.28Ω/m | |
| Anneal holder distance | 250mm | |
| Specimen distance height | holder and | 70mm, high:60mm (the distance between the holder surface to the connector plate surface) |
| Wire tension distance wrapping and its | 5.4N±0.05N，6.3mm±0.2mm(within 31.5mm±0.5mm, coil 5 cycle, national standard is 6mm) | |
| Annealing power
time and |
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] | |
| Combustion box volume | Greater than 0.5 m3（can be order 0.75 m3,1 m3） | |
| Power supply | AC 220V±10%, 50Hz；110V, 60Hz | |
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