FIELD: automatic control systems, in particular, for air cooling and ventilation, heating and hot water supply. SUBSTANCE: device has serial circuit of resistive thermometer, measuring bridge circuit, voltage amplifier, positional relay, gate and final-control unit. In addition device has pulse chopper, which output is connected to input of gate, two-level comparator and reference voltage source. Inputs of two-level comparator are connected to outputs of voltage amplifier and reference voltage source. Output of comparator is connected to input of final-control unit. EFFECT: increased reliability, additional function of protection of heat-exchanger in emergency. 1 dwg
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