| 摘要 |
FIELD: instrument making.SUBSTANCE: ultrasonic meter of flow speeds is complemented with six heaters located in pairs in each measurement base, having direct thermal contact with their electroacoustic converter and connected via the second switchboard to a source of power supply and a temperature controller, also three OR devices, a control device and the second counter, the outlet of which is connected to the first input of the control device, to the second input of which the temperature controller output is connected, and its first output is connected to the control input of the second switchboard, at the same time the second output is simultaneously connected with locating (additional) inputs of a synchronisation device and a computing device and the first inputs of three OR devices, besides, the second inputs of the first and third OR devices are connected to the output of the assembly of identification of the third period of the sinusoid, the output of the first OR device is simultaneously connected to the second inputs of the first, third and fourth triggers, the output of the third OR device is connected to the second input of the second trigger, the second input of the second OR device is connected to the output of the first trigger, and its output - to the second input of the second counter, the first input of which is connected to the output of the third comparator.EFFECT: increased reliability and expanded temperature range of functioning.3 dwg |
