Glow wire test apparatus is the commonly used equipment for testing solid insulating material for fire hazard testing. This test apparatus is covered in IEC 60695-2-10:2021 and commonly referred for various devices in many standards such as IEC 60335, IEC 60695-2-11, IEC 60695-2-12, IEC 60598-1, IEC 60947, IEC 60898, IEC 61008-1, IEC 60669-1, IEC 60884-1, IEC 60950-1 / IS 13252, IEC 60238, IEC 60745-1, IEC 60400, IEC 60730-1, IEC 61050, IEC 60320-1, IEC 61058-1, ASTM D 6194-03 and UL 60745-1.
As per IEC 60695 – 2 – 10 : 2021 (Glowing/hot-wire based test methods – Glow-wire apparatus and common test procedure), parts of solid insulating materials are ignited by glowing wires. A nickel/chromium wire is heated to 960°C and the insulating material is pushed against it with a force of 1 Newton. It is checked that the insulating material does not attain a certain temperature or catches fire so as to prevent fire hazard in their vicinity. For complete description, please refer IEC 60695 – 2 – 10 : 2021, even if you have product specific standards such as IEC 60898 for Miniature Circuit Breakers (MCB), IEC 60335 for Safety of Electrical Appliances or IEC 60947 for Switchgears and so on. If your product is to be tested for conformity assessment, please also refer ASTM D 6194 – 3 (Standard Test Method for Glow-wire ignition of materials).
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Specification :
* A motorized sliding carrier with a universally adjustable SS mesh
* Perforated tray is provided to mount the specimen (insulating material under test).
* Self-adjusting constant current mode operation as soon as heater-specimen contact is established
* Motor brings the jig back to the pre-test position automatically as soon as the test is concluded
* Nickel / Chromium based heating element (glow wire)
* Cr/Al based fine wire based thermocouple for temperature sensing
* Temperature Range: Adjustable up to 960° centigrade
* Time setting – 0 to 99.9 seconds
* Precision scale: Precision scale is provided to measure the height of the flame
* Safety – Emergency Switch, MCB , Fuses
* Dimensions – L 1040mm W x 540mm D x H 1040mm
* Entire glow wire apparatus is built in aluminum sections for better aesthetics
* PC based Operation & Data-logging possible with report generation.
* Used by IEC CB Test-labs including Underwriters Laboratories, CPRI, TUV, SGS, Bureau-Veritas, Intertek, IDEMI, ERTL, ERDA, ETDC, CIPET, NTH and others.
* Temperature Sensor – Thermocouple: Fine wire of Cr/Al of 0.5 mm diameter located in 0.6 mm diameter pocket hole in temperature sheath resistant to 1000 degree centigrade
* In the model GWT A2, current is held approximately constant (15 % swing) once the heating element touches the specimen.
* Heating Element – Glow Wire: Nickel / Chromium (>77% Ni/20±1%Cr) based heating element (glow wire) with overall diameter of 4.00mm ±0.07mm
* Time Controller – Micro-controller based programmable timer 0 to 99.9 sec
* The total test time can be programmed through keyboard
* The ignition time and extinguish time of flame can be registered in timer
* The stored time values can be viewed after the end of test
* Setting on PC for PC based variant
* Penetration Depth – Mechanically restricted to 7 mm
* Specimen size – 180 x 150 Sq. mm max. & 15 x 15 Sq. mm min., Thickness 10mm to 80 mm
* Test specimen contact force against the glow wire is preloaded to 0.95 N ± 0.10 N
* Test Chamber Dimensions – 1080 mm W x 580 mm D x 1080 mm H. (approx.)
* Dimensions – 600 mm W x 300 mm D x 610 mm H. (approx.)
* Supply Voltage – 230 V AC, 50 Hz, 1 Phase, 500 VA
* When the silver starts to melt, thermometer indicates 960±10 °C
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SCR Elektroniks |
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