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An autonomous device for magnetoanisotropic monitoring of the stress state of overhead crossings of main pipelines, which consists of: magneto-anisotropic transducers (up to 6 pcs.), installed evenly on one cross-section of the pipeline; transducer signal processing unit; GSM modem; directional antenna of the GSM modem; timer; battery; photoelectric transducer is proposed. Every 2 h 57 min, the timer supplies power to the transducer signal processing unit and the GSM modem. The transducer signal processing unit begins alternate power supply and interrogation of magneto-anisotropic transducers, their amplification, analog-to-digital conversion, calculation of active voltages, and compilation of the SMS message text. The SMS message text consists of the following blocks of information: current date, time of compilation of the SMS message, six blocks of stresses according to magneto-anisotropic transducers and battery voltage. The SMS message text is transmitted to the GSM modem via the RS-232 interface. The GSM modem with a directional antenna, which provides a signal amplification of 20 dB, sends this message to pre-recorded cellular numbers. The operation of the converter signal processing unit lasts 3 min and this is enough for stress measurements and SMS message transmission. The nominal power of the photovoltaic converter is 10 W at a voltage of 12 V. The battery capacity is 22 A·h, which ensures reliable operation of the device during the winter period (3 months). In the office of the organization operating the pipeline, using a computer with specialized software and a GSM modem, sent SMS messages are received, a measurement database is maintained and monitoring results are analyzed. This allows real-time information with a step of 3 h to get information about the stress state of overhead crossings of main pipelines and to make informed technological decisions. Experimental operation of autonomous devices on the pipeline over several years has confirmed the correctness of the proposed technical solutions.

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