Adopting pumping suction type and sensitive sensor, especially suitable for leak detection of trace amount of combustible gases. Display is LED beam. With functions like sound and light alarm, low voltage display, etc. Power supply uses rechargeable nickel hydrogen battery The instrument uses gas sensory semiconductor sensor with features like high sensibility, quick response, good reliability and long life Extensively used in the sites having faults and minor leakage in the gas bottle, bottle valve and gas supply duct for petroleum, city gas, etc. The electric circuit is designed with intrinsic safety |