EXPLOSION HAZARD PNEUMATIC SPARK INDICATOR Russian patent published in 1994 - IPC

FIELD: pneumoautomatics. SUBSTANCE: indicator has explosion chamber 1, provided with built-in spark-gap generator 3, fire barriers 2. Explosion chamber 1 is connected with tested gas trunk, ejector, explosion pickup 4 and combustible gas weigher 6 on base of pressure stabilizer and pulsing capacity 7, provided with two valves 8 and 9. These valves are used for connecting pulsing capacity 7 with output of pressure stabilizer 6 and input of explosion chamber 1. Tested gas trunk and ejector 5 are connected with chamber 1 through input and output valves 10 and 11 correspondingly, as well as through control unit. Indicator is provided with balloon filled with fuel, restrictor 13 and single-membrane element 14, which has a spring, in dead chamber; the latter communicates with atmosphere. Light-emitting diodes 16, 18 and 20 and single-membrane elements 15, 17, 19, which have springs in dead and through chambers and two dry contacts. Members 15-20 are mounted in each combustible gas trunk, supply air trunk and tested gas trunk. EFFECT: improved reliability; simplified exploitation. 3 dwg