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德國(guó)PTL灼熱絲測(cè)試儀
德國(guó)PTL灼熱絲測(cè)試儀,符合標(biāo)準(zhǔn)IEC60695-2-10:2000、IEC60695-2-13:2000(灼熱絲/熱線基本試驗(yàn)方法,灼熱絲試驗(yàn)裝置和通過試驗(yàn)程序)、IEC829, DIN695和VDE0471等.
它是將規(guī)定材質(zhì)和形狀的電熱絲用大電流加熱至試驗(yàn)溫度(550℃-960℃)1min 后,以規(guī)定壓力(1.0N)垂直灼燙試品30s,視試品和鋪墊物是否起燃或持燃時(shí)間來測(cè)定電工電子設(shè)備成品的著火危險(xiǎn);測(cè)定固體絕緣材料及其它固體可燃材料的起燃性,起燃溫度(GWIT)、可燃性和可燃性指數(shù)(GWFI)
PTL Glow Wire Test Apparatus
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, table-cloths, or curtains, e.g. after coming into contact with a lighted cigarette.
For this reason, prototypes of all articles which could be a source of danger if they con-tact with ignition sources should be subjected to the Glow-wire Test.
Test Apparatus
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.
Test Method
The specimen and, if necessary, a base shall be attached relative to the wire loop in such a way to represent the most unfavourable practical case. The scales of the measuring device shall be adjusted and the penetration depth of the loop shall be limited by the adjustable stop. After returning and covering the specimen the loop shall be heated up to the specified temperature.
When the loop has maintained the testing temperature for at least 60 seconds, the specimen can be briskly led up to the loop. From the moment of contact, an operation time of exactly 30 seconds must be kept. Then the penetration depth is read and the specimen is slowly returned to its starting position. During and after the operation the burning behaviour of the specimen and the tissue paper on the wooden board has to be observed.
S t a n d a r d o u t f i t :
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℃
1 miniature jacket thermocouple Chromel-Alumel, with plug almost free fr