Roof sinking speed alarm roof sinking speed alarm can precisely measure the mine, wellbore, mine, mining face, sheds and other arch sinking speed, subsidence, deformation and displacement speed, volume and so on convergence. The main technical parameters: ① maximum linear displacement volume: 260mm; ② overrun preset speed range: 0.299 × 10mm/min; ③ overrun preset number :1-9 min / times; ④ Resolution: 0.01 min; ⑤ Adaptation :0.6-3m; ⑥ proof type: iblEx. Science and technology of coal-day safety precautionary safety monitoring mine safety concerns of millions of miners happy family! Mechanical and Electrical Equipment Co., Ltd. Tai'an City Warner enterprise refers to the case is: "To China energy exploitation escort"! Roof safety observation equipment, rock pressure observation equipment, coal mine safety instrumentation of Tai'an City Mechanical and Electrical Equipment Co., Ltd. Warner Roof separation instrument company related products Please log in Tai'an City Mechanical and Electrical Equipment Co., Warner view the official website, http://www. tahnjd.com / Yinchuan separation instrument, roof separation indicator, Warner electromechanical roof separation provided by Warner electromechanical meter. This information consists of: Mechanical and Electrical Equipment Co., Ltd. Tai'an City Warner (www.tahnjd.com) offer, we are Commercial Union membership, the integrity of the whole network authentication provider. Feel free to contact us, Contact: Lee