chat
  • Traffic Light

  • LED Traffic Light

  • LED Gas Price Sign

bbm technology co.,ltd is professional manufacturer with led traffic lights,traffic light modules and led digital gas price sign products in shenzhen,china.welcome oem&odm cooperation!
Products
CONTACT US

BBM  TECHNOLOGY  CO., LTD

3/F,The 5rd Building,Fu'An 3rd Industrialpark,FuyongTown,Bao'an District,Shenzhen 518103 China.

H/P: +86 13823252578

Tel : +86 755 29174815

Fax : +86 755 29174811
Email: bbm@bbmled.com

Skype: joolduan

Wechat:SHARE-TOGETHER


SERVICE HOTLINE

+86 13823252578

+86 (755)29174815

Enterprise News

Your current location: home > News

Test for protection grade of the shell of led pedestrian traffic signal light

  Electronic and electrical Products working in the open air usually possess the performances of waterproof and dust proof and sometimes are required to achieve a certain protection grade. Led traffic sign core exposed in the air directing traffic at intersections are no exception. If the protection grade of Led traffic sign core is too low to have water and dust resisting property, the dust will get into the led traffic signal core and cover the electronic components,as well as the water. When the dust absorb water from the surroundings,that may be the beginning of making corrosion to the electronic components. The corrosion will led to decline of insulation,short-circuit and grounding fault in the long run,which greatly shorten life expectancy of led traffic signals. At present the led traffic sign core produced by BBM all achieve protection grade of IP65 which completely prevent water and dust ingress.


  BBM perform the protection grade test of led pedestrian traffic signal light according to the latest national standard GB14887-2011 to ensure its performance of waterproof and dust proof in the dust and rain.The latest national standard GB14887-2011 prescribes the dust-proof grade of led pedestrian traffic signal light should not be less than IP5X specified in GB 4208,and waterproof grade should not be less than IPX3 .

Test for dust-proof

Testing method:


  The test is conducted in Dust Testing Chamber and the internal air keep the Talcum powder in suspension when the test is performed. 2 kilograms Talcum powder should be contained in per cubic meter of space and the minimum size of the Talcum powder is 1μm~75μm . There should be 50%of the total weight of the Talcum powder whose size is smaller than 5μm. One other thing to note is Talcum powder used more than 20 times are not permitted to undergo test. Let the Led pedestrian traffic signal light firstly worked for 1hour at rated voltage outside the Dust Testing Chamber ,after which put it into the chamber with least Perturbation. turn on the fan to make the Talcum powder in suspension and keep the Led pedestrian traffic signal light going on working for 1 min. Then turn off the power source of Led pedestrian traffic signal and leave it in Dust Testing Chamber with Talcum powder suspended for 3hours. Visually inspect the specimen and take dielectric strength test.


Conclusion : There are no deposit of Talcum powder within the shell of Led pedestrian traffic signal light,as well as the inside of the Led pedestrian traffic signal module.


Test for waterproof :

Testing method:

  Water-spraying device is used to carry out the test for waterproof .keep Semicircle pipe radius as small as possible and adapting to the size and location of Led pedestrian traffic signal light in order that the water from blowhole of Semicircle pipe is spraying towards center point of the circle ball of Led pedestrian traffic signal light. Water pressure at the entrance of Water-spraying device is about 80kPa.Semicircle pipe should swing 120 degrees,which is divided to two 60 degrees on both sides of perpendiculars. The time of a complete swaying is about 4s. Led pedestrian traffic signal light should be installed above the spin axis of Semicircle pipe so that both side can be sprayed. Then switch on the power of Led pedestrian traffic signal light and make it rotate around the vertical axis at the speed of 1r/min. Shut down the power of Led pedestrian traffic signal light after Water-spraying device spraying water on it for 10 min. Then leave the Led pedestrian traffic signal light to cool naturally and Water-spraying device to spray continuously for 10 min.


Conclusion :


  There are no deposit of water within the shell of Led pedestrian traffic signal light,as well as the inside of the Led pedestrian traffic signal module.