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Wireline mounting a U20 water level data logger in a well
HOBO Water Level data loggers can be hung in wells using Onset's special low-stretch cable with Teflon coating, to avoid snagging and to make them easy to clean.
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Altitude effects on water level data logger range
Onset's HOBO® U20-001-01 Water Level Data Logger is calibrated from 10 to 30 psia. The 10 psia lower limit creates an effective altitude restriction of about 10,000 feet when the data logger is used. The unit can be used above 10,000 feet, but it is outside of the calibrated range, and the accuracy specification does not apply. The data logger will function, but the accuracy will get worse the further below 10 psia the pressure drops.
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Using a Water Level Data Logger to Determine Stream Flow
Water level data loggers are commonly used to determine stream flow over time and "peak discharge"
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Using 3rd-party barometric pressure data for compensation
HOBOware Pro's Barometric Compensation Assistant now includes the ability to import barometric pressure data from 3rd-party sources such as nearby weather stations. The data needs to be provided in a text data file, and can be in kPa, Pa, mbar, mm HG, psi, or inches Hg. For more information, see the User's Guides for the Barometric Compensation Assistant and the HOBOware Pro software (Importing Data section) or in HOBOware under Help, HOBOware Help.
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Deploying a HOBO water level data logger in salt water
316 Stainless Steel has good corrosion resistance but it can be damaged by crevice corrosion in saltwater. The stainless steel versions of HOBO data loggers should not be deployed for more than 6 months (lifetime cumulative) in salt or brackish water, or the housing will eventually fail and water will damage the electronics. How long the data logger will last depends on many factors such as salinity, level of dissolved oxygen, and temperature. Biofouling can also limit deployments in saltwater, because growths on the pressure sensor will change its calibration.
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How can I tell what version of Java is installed?
You can find this by running a command in a Command Prompt window.
Get to Command Prompt by clicking on the Start button on the Taskbar, then click All Programs, then Accessories, then Command Prompt.
Once the Command Prompt window is open, key in this command: java <space> -version
Press the Enter key on the keyboard. The command will display about three lines of text that identify the Java component versions. The first line is the report of the overall Java run time environment.
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H21-002 (HOBO® Micro Station) battery installation
It is always recommended that you readout the data logger before replacing the batteries. If you replace the batteries while the Micro Station is logging, it will stop recording data. The data will be overwritten the next time you launch it. If the batteries are dead, be sure to readout the data prior to re-launching the data logger after you have replaced the batteries. To replace the batteries, unscrew the top cover. Remove the battery strap and the old batteries. Insert the new batteries and replace the battery strap.
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How to install a Data Assistant
Before starting, make sure you have the .jar file. This can be downloaded from /support/updates under the Data Assistants tab.
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Stopping your data logger
All HOBO and StowAway data loggers shut off when the memory is full (unless wrap-around is selected) or the data is downloaded to a computer. Once the data is downloaded to the computer, the data logger is in off mode and will need to be relaunched to continue data collection. If the data logger you are using is shuttle-compatible and you are downloading to a shuttle, the shuttle will automatically relaunch the data logger using the previous settings.
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