to determine the fire resistance by the fire hazard test
in accordance with IEC6 0695-2-10 :2000 ～ IEC6 0695-2-13 :2000
and further standards and regulations listed in the STANDARDS SCHEDULE T 03e
The test procedure is used to examine the fire resisting properties of products if, during the application or in the case of a fault, heated or glowing parts could be considered as a short-time ignition source. Loose connections or bad contacts cause punctually high temperatures on electrical articles, their components and their parts. Attention should also be paid to the fire risk in connection with textile seat coverings, tablecloths, or curtains.The PTL glow wire test apparatus is suitable for lighting equipment, low-voltage electrical appliances, household electrical appliances, machine tool electrical appliance, motor, electric tools, electronic instruments, electrical instruments, information technology equipment, electrical business equipment, electrical connections and accessories and other electrical and electronic products and components of the research, production and quality Inspection department, also suitable for insulation plastic materials,
The ignition source is imitated by an electrically heated wire loop against which the sample is pressed with a constant force. A miniature jacket thermocouple serves as a sensor for the loop temperature. The sample has to be fastened to a carriage on which, by means of a tensioning cord, a weight with a force of 1 N is effective in the direction of the wire loop. Scales enable the reading of the flame height and the depth of penetration. Approx. 200 mm below the wire loop a board of pine wood, covered with a layer of tissue paper, is mounted. This device enables to judge the danger of a fire spreading through burning drops or glowing parts falling from the sample.
Standard outfit :
1 wire loop of nickel-chromium, with clamping mechanism,
1 carriage with Cardanic holding device for the specimen, five-fold adjustable,
1 rail system with ground running surfaces,
1 fine rope pull mechanism with weights for loads of 1 ± 0,2 N,
1 indicating device for the depth of penetration, with maximum pointer and stop,
1 scale to measure the flame height, multiple adjustable,
1 high current isolating transformer to heat the wire loop, with series connected variable ratio transformer, to set the temperature up to 960 °C,
1 miniature jacket thermocouple Chromel-Alumel, with plug almost free from thermoelectric voltage and with compensating lead,
1 temperature indicating instrument to indicate the temperature of the glow-wire loop, with digital display, measuring range 0...1000 °C, class 0,5, built-in operable, see Fig.
1 and 3, can be recalibrated, with compensation of the ambient temperature.
1 housing, desk shaped, with all necessary electrical components, with safety switct
PULSE TIMER WITH TIME DISPLAY
The pulse timer is started by a push button at the same time as the specimen contacts the loop. By that, the indication of the time begins to run. The minutes and the seconds appear on the display in numerals which are good to read. At the first signal, the specimen has to be returned. At
each following signal, the flame height has to be observed. The pulse timer can be switched off by pressing the button "STOP". By means of a switch it is possible to preselect, if the glow-wire heating shall be automatically interrupted at the first signal. See Fig. 1 and 3.
for slowly moving up the specimen to the wire loop ,and for returning to the starting position at aconstant speed As soon as the specimen contacts the loop, a coupling releases the carriage. After an operation time of exactly 30 seconds, the carriage is automatically returned. The test results are better reproducible, and the laboratory technician's attention is not diverted during the testing procedure by having to do various operation tasks. He can fully concentrate on the observation of the specimen.