KGV-GFD6 coal duct air flow switch sensors duct air flow switch sensing GFT15 proof duct air flow sensor GFD6 (formerly KGV6) coal duct air flow switch sensor (hereinafter referred to duct air flow switch), is a mining intrinsically safe GFT15 air flow duct Maxi switch sensing equipment can be used in coal mine explosive gas environments. Duct air flow switch is not powered primarily used to detect the coal mine or coal face tunneling face local fan air flow within the duct adequacy. When sufficient air flow inside the duct, the activity stent deployment resulting in mechanical pushbutton switching and passive contact signal output for external equipment acquisition. Can effectively reduce the air volume inside the small duct, duct or fan failure occurs leakage caused by security incidents. In addition to duct air flow switch and KJ70N mine safety and production monitoring system can also be used in conjunction with external and internal monitoring systems other mines compatible. Jining Branch-Mining Equipment Co., Ltd. Contact: Lv