Environmental Engineering Reference
In-Depth Information
Figure 4-8.
A data logger.
Source:
Campbell Scientific.
and recording intervals. It is prudent to mount the logger in a noncorrosive, water-
tight, lockable enclosure to protect the logger and the peripheral equipment from the
environment, theft, and vandalism. It is recommended that the data logger
be capable of storing data values in a sequential format with corresponding time
and date stamps;
•
contribute negligible errors to the signals received from the sensors;
•
have an internal data storage capacity of at least 40 days;
•
possess an onboard real-time clock so that the time stamps will remain accurate
even if the logger loses power;
•
operate in the same environmental extremes as those listed in Table 4-1;
•
offer retrievable data storage media when a remote uplink is not possible;
•
offer remote data collection options;
•
operate on battery power (which may be augmented by other sources such as a
solar panel);
•
offer nonvolatile memory storage so that data are not lost if power fails.
•
A number of electronic data loggers that meet these criteria are commercially
available, and a vendor list is provided in Appendix A.
4.5 DATA STORAGE DEVICES
Every data logger contains a computer running on operating system software. It
includes a small data buffer to temporarily hold data for processing. The computer
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