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Creating a voltage divider
A voltage divider will drop the voltage of the input signal to the level the data logger can measure.
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Making beaded probes on a thermocouple wire
A thermocouple is a kind of battery made by joining two dissimilar metals together where a small voltage is generated by the difference between teh metals. The voltage gnerated changes with temperature. To make a thermocouple temperature sensor out of thermocouple extenision wire, strip the insulation back a little and make an electrical connection between the two wires. The more reliable your connection, the more reliable the thermocouple. Welding is the best way to form a reliable thermocouple. A resistance welding machine (spot welder) can be used (with practice), and TIG welding works nicely too.
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How often do temperature data loggers need recalibration and/or servicing?
All sensors drift over time and they can be tested in a controlled environment to make sure that they are running within the specifications outlined in the User's Manual. You can use methods such as a simple ice bath or an environmental chamber to verify your device is operating correctly.
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The effects of electroshock fishing on underwater loggers
Although we have not tested this, we have run into incidents in the past where customers have left data loggers in this situation and have not had a problem. On the other hand, we have also had customers whose data loggers stopped recording. It is a gamble and strictly up to you. We do suggest that you pull the data loggers up to be on the safe side, or at least check them after to make sure that they are still recording.
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Using Onset data loggers if computer has USB ports and no serial port
Onset offers a Serial-to-USB Adapter (http://www.onsetcomp.com/products/cables/adapt-ser-usb) that provides a simple way to connect HOBO and StowAway® data loggers to available USB ports on your computer.
Onset also offers a USB solution with the U-Series Family of data loggers, which interfaces directly with the USB port on your computer.
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Possibility of exposure to chemicals or chemical vapors
This is dependent on the data logger you are using and the chemical and/or concentration of the chemical to which the data logger is exposed. Many chemicals will have an adverse effect on the data loggers and/or the sensors that the loggers utilize. Contact your authorized sales representative with questions regarding specific chemical contact with the data logger that you are using.
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Protecting data loggers from electrical discharge (ESD)
A discharge of static electricity may cause a running data logger to stop recording. Precautions should be taken to prevent this while handling the data logger. Discharges may occur when there is a charge difference between the data logger and a cable being connected to it or when a person touches an exposed jack.
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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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