Wireless data logger
Data loggers often come in two different major variances, WiFi data loggers or usb data loggers. The main difference between the two is the way data is exported, and the possibility of getting real time alarms if the data loggers measures values outside the specified limits.
WIFI data logger
Wifi data loggers work by constantly measuring (temperature, humidity, etc.) and sending the data on a regular basis to a server. The server is either situated locally or in the cloud.
The WiFi data logger often stores measurements locally for longer or shorter periods, and then sends this data to the server.
The advantage of having a WiFi data logger compared to a usb data logger is that the WiFi data logger can transmit data automatically without the need of manual work, and that the WiFi data logger can send data immediately if temperature excursions occur, which in turn can send an alarm to the users of the system. This means that corrective actions can be performed, thus minimizing the risk of actual non-conformities.
Usb data logger
Usb data loggers measure temperature or an other environmental parameter in a predefined frequency and stores this in the memory of the data logger. Based on the measurement frequency and the size of memory, the memory of the data logger will be filled after a certain amount of time. Before the memory is full, the usb data logger has to be emptied by inserting it into a pc, and using the associated software the data has to be downloaded and stored appropriately.
Based on what the limits are for the equipment or storage facilities where the data logger was placed, data has to be analyzed for any non-conformities during the period the data logger was measuring, and appropriate corrective actions need to be performed.