Data loggers are electronic devices that are used to monitor and record temperature and humidity levels in a cold chain. These devices are equipped with sensors that can measure temperature and humidity levels at regular intervals, and they store this data in an internal memory. Data loggers help in cold chains by providing accurate and reliable information about the temperature and humidity conditions that the products have been exposed to throughout the supply chain.
The selection of sensors in data loggers depends on the specific application and the measurement requirements. Different sensors are used to measure different physical parameters such as temperature, humidity, pressure, light, and shock/vibration. Some of the factors that are considered when selecting sensors for data loggers include accuracy, sensitivity, stability, linearity, range, resolution, response time, and cost.
For temperature measurement, thermocouples, thermistors, and resistance temperature detectors (RTDs) are commonly used sensors. Humidity sensors include capacitive, resistive, and thermal conductivity sensors. Pressure sensors include piezoresistive, capacitive, and piezoelectric sensors. Light sensors include photodiodes, phototransistors, and photovoltaic cells. Finally, shock and vibration sensors include accelerometers and gyroscopes.
The selection of the appropriate sensor also depends on the physical environment and the requirements of the application. For example, in a cold chain monitoring application, a temperature sensor with a wide range and high accuracy may be required, while in a pharmaceutical manufacturing environment, a humidity sensor with fast response time and high stability may be necessary.
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