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What Is A Data Logger?
A data logger or datalogger is an electronic device that is used in conjunction with a computer to monitor or record various signals. Remember when you were at school and you did experiments, measuring the temperature of boiling water, taking a reading every minute until it boiled. Well, a data logger would do this for you automatically. All you need to do is tell it how often to take a reading and at the end of the experiment, it will produce a graph for you.
The data logger may have internal sensor(s) or it may have one or a number of channels where external sensors can be connected. Some data loggers can be configured to accept a wide range of sensors.
Using the computer, the data logger is programmed to "wake up" at predetermined intervals, take a reading and go back to sleep. The time period between readings is called the "sample period" and can range from many readings per second to once per day. The data logger will have an internal memory where the readings are stored. Once this memory is full, the data logger can be programmed to stop taking new readings, and therefore not loose any readings or, overwrite the oldest reading.
Once the data logger has been monitoring for the required time period, it is connected to the computer. The stored readings are then downloaded and saved on the computers hard disk. A graph can now be produced showing the measured signal over time - providing an accurate account of what the data logger measured.
Once the stored information has been downloaded from the data logger, the memory is cleared and the data logger is ready to be re-used over and over again - well, until the battery runs out!
The majority of Signatrol's data logger are battery powered and the battery should last for a number of years.
Where Are Data Loggers Used?
Data loggers are used in a wide variety of applications from simple monitoring of temperature in an office environment to monitoring the temperature of perishable products in transit or optimising the production process of food, pharmaceutical or engineering products. The same data logger can be used in a variety of applications, the sensors it uses really determine the application.