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RECORDER OF CONDITIONS OF STORAGE AND TRANSPORTATION OF SPECIALIZED CARGOES

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Storage and transportation of specialized goods that are sensitive to environmental parameters and mechanical stress are considered. A recorder of parameters characterizing storage and transportation conditions is described. Specifics of the cargoes under consideration determines rigid requirements imposed on duration of continuous autonomous operation of the recorder, frost resistance, readiness for immediate fixation of the fact of a fall or impact. A concept of design of a recorder that meets these requirements is proposed. The choice of cold-resistant current sources based on lithium-thionyl chloride with a long shelf life, low level of self-discharge and high energy density is substantiated. A set of sensors to measure environmental parameters and mechanical effects is determined, and recommendations on their connections to provide minimum energy consumption are formulated. A solution to the problem of insufficient lower limit of the operating temperature of the digital thermal sensor is proposed; the solution provides combination of the digital thermal sensor with an analog one. Application of domestic microcontrollers manufactured by Milandr company is justified by meeting the frost resistance requirement. The issues of memory storage and communication interface with a personal computer after a long period of operation of the recorder are considered. The recommendations for reducing energy consumption by software methods are given, using the capabilities of digital sensors to go into sleep mode and back.

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