FIELD: measurement technology; aerodynamic units for indicating limit distance to agents, materials and articles; automatic level control systems for dangerous processes of chemical, petrochemical, paint-and-varnish and other industries. SUBSTANCE: proposed level alarm includes pneumatic sound oscillator, jet member, type "type-receiving channel" whose outlet is connected to secondary device. Level alarm includes also plane acoustic wave shaper made in form of section of pipe having length of λ/8 where λ is length of wave being generated; said section of pipe is mounted after pneumatic sound oscillator provided with diaphragm at output. Jet member is arranged in plane acoustic wave shaper. EFFECT: enhanced accuracy; extended field of application. 1 dwg
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