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Boosting mV outputs to 0-2.5 DC outputs for use with HOBO stand-alone data loggers
Simple non-inverting op-amp amplifier circuit - how to boost mV to 0-2.5V DC.
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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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Cleaning Optic StowAway/StowAway TidbiT data loggers
Do not use any type of chemical on an Optic or TidbiT data logger! You can wash the data logger with a mild soap and warm water solution. If the data logger has a mineral or algae build-up that will not come clean, do not scrape it off. Instead, use a plastic polish, such as Novice.
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Logger power failure and data loss
The data is stored on non-volatile EEPROM. For data loggers with external batteries: change batteries and offload data, then relaunch normally. For data loggers with internal batteries: as long as the EEPROM has not been damaged, the data can be retrieved by Onset. Please contact the place of purchase for a return authorization number and request data back service.
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Optic logger communication problems
All Users: HOBO Optic data loggers must be inserted into the Base Station (or Shuttle) using the appropriate coupler for that logger in order for the computer to detect them. Note: HOBOware will not detect the Base Station alone as an attached USB device.
Check to make sure that the coupler is positioned properly and the magnet end is closest to the data logger, not the Base Station or the Optic Shuttle.
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Rapid battery consumption (outdoor loggers)
All Users: Check both the logging and the sampling interval to make sure they are greater than one-minute intervals. For example, with a sampling interval of one second, the HOBO logger is constantly on and there is a constant drain to the batteries. If your application calls for such an interval, you may need to replace the batteries more frequently
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