Data Formats and Protocols:
– Standardization of protocols and data formats is increasing.
– XML, JSON, and YAML are commonly used for data exchange.
– The Semantic Web and the Internet of Things are driving this trend.
– Instrumentation protocols include Smart protocol, SDI-12, MODBUS, and CAN-Bus.
– Some data loggers support non-standard protocols through flexible scripting.
Data Logging Features:
– Data loggers have slower sample rates compared to data acquisition systems.
– They are standalone devices with onboard memory for data storage.
– Record date and time in timestamps for event sequences.
– Range from simple single-channel to complex multi-channel instruments.
– Must be highly reliable for unattended and remote applications.
Applications of Data Loggers:
– Used in unattended weather stations, hydrographic recording, soil moisture level monitoring, gas pressure recording, and offshore buoys.
– Applications in pharmaceutical storage, transportation, process monitoring, wildlife research, environmental monitoring, vehicle testing, motor racing, and more.
– Also used in science education, load profile recording, and veterinary vital signs monitoring.
Examples and Specialized Uses:
– Black-box loggers like FDR, CVR, EDR, VDR, and ADR in various industries.
– Specialized digital data loggers in embedded systems, racing industry, health monitoring, and high-speed data acquisition.
– Future directions include wireless communication, open-source software, and more automated operations.
Further Resources and References:
– Additional resources on black box recorders, computer data logging, sensorML, shock/vibration data loggers, temperature data loggers, and more.
– References to studies and journals on time-temperature indicators, parcel shipping environments, authority control databases, packaging technology, and measurement analysis.
This article needs additional citations for verification. (October 2020) |
A data logger (also datalogger or data recorder) is an electronic device that records data over time or about location either with a built-in instrument or sensor or via external instruments and sensors. Increasingly, but not entirely, they are based on a digital processor (or computer), and called digital data loggers (DDL). They generally are small, battery-powered, portable, and equipped with a microprocessor, internal memory for data storage, and sensors. Some data loggers interface with a personal computer and use software to activate the data logger and view and analyze the collected data, while others have a local interface device (keypad, LCD) and can be used as a stand-alone device.
Data loggers vary from general-purpose types for a range of measurement applications to very specific devices for measuring in one environment or application type only. It is common for general purpose types to be programmable; however, many remain as static machines with only a limited number or no changeable parameters. Electronic data loggers have replaced chart recorders in many applications.
One of the primary benefits of using data loggers is the ability to automatically collect data on a 24-hour basis. Upon activation, data loggers are typically deployed and left unattended to measure and record information for the duration of the monitoring period. This allows for a comprehensive, accurate picture of the environmental conditions being monitored, such as air temperature and relative humidity.
The cost of data loggers has been declining over the years as technology improves and costs are reduced. Simple single-channel data loggers cost as little as $25. More complicated loggers may cost hundreds or thousands of dollars.
