What are the main domestic manufacturers of explosion-proof cameras?

Domestic manufacturers do explosion-proof cameras are currently concentrated in Changzhou, Shenzhen, Beijing, the three places. Of course, there are manufacturers in other places, but on the strength are not good, some have an explosion-proof certificate to sell products, quality, after all, explosion-proof camera applications are flammable and explosive fried high-risk places, no one can afford the responsibility, regardless of which do the project must be required to choose a reliable manufacturer, and now the state launched the 3C certification, explosion-proof cameras need to be processed. Changzhou is currently the most powerful Yuhua, Zuoan, Shenzhen is the Tianxuntong, strong U.S., Beijing is Pu'an, Hongbo Yatai, are indeed good strength, qualification is complete, basically have cooperation, do not like do not spray. Of course, Haikang Dahua now have to do explosion-proof cameras, if the cost-effective and professionalism, this everyone choose for themselves.