LTE-M temperature logger for pharmaceutical cold chains that predicts remaining shelf life at current temperature.

A pharmaceutical logistics company requiring a cellular-connected temperature logger for monitoring mRNA vaccines and biologics during international transport.
Maintaining EN 12830 compliance across -40°C to +85°C ambient range, with real-time alerting if cold chain is breached, and autonomous operation for 90-day shipping cycles.
The Nordic nRF9160 LTE-M SiP reads an internal MAX31875 digital temperature sensor and supports an external PT100 RTD probe. A 19Ah Li-SOCl2 D-cell provides 3-year standby life.
The Zephyr RTOS firmware samples temperature every 10 seconds. A running Mean Kinetic Temperature (MKT) calculation per USP standards is updated on each sample. The predictive spoilage model estimates remaining vaccine shelf life at current temperature using Arrhenius equation coefficients.
EN 12830 Class B certified. 90-day continuous logging with hourly LTE-M check-ins.
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