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Data Logger for Refrigeration
Thanks - I checked out their site - A bit technical, but it seems that the
iButton line is aimed at temperature/humidity logging. I would also need to know when compressor switches on and off - For this, I would ideally use current measurement (0-10A DC), voltage (0-30V) or even something like sound. Two temperatures would be better than one. Because of this, the buttons made for monitoring transportation temp/humidity, may not be the best choice. The multi port dataloggers would be great, but cost is a bit high for a one time experiment. There are units that interface with a computer that are aimed at school science projects that are more reasonable, but my laptops CDROM just failed! http://www.drdaq.com/ I would prefer a stand alone unit for data collection that I can connect to my desktop computer for downloading. The Onset Hobo would do the job, but by time software and sensors are added, it becomes a bit pricey for a 1 time job. GBM wrote in message ps.com... Dallas Semiconductor sells temperature loggers as part of their iButton line which can be placed wherever you want records. They come in a can about the size of a quarter. You can also purchase a USB interface, which you can connect the temperature logger into to get the data out of it, and set the parameters to sample the data in the first place. See http://para.maxim-ic.com/cache/en/results/4872.html for the USB interface, and http://para.maxim-ic.com/cache/en/results/4871.html for the loggers themselves. Starter kits are available from http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2820; this kit for $60 includes the USB interface, and a thermocron (which might be for the wrong temperature range). The thermocrons typically have a 10 year lifetime. I've strapped these to water heater output lines and watched the usage patterns of hot water. Software for windows XP is free for download. If you're trying to use this with Linux, try the "One Wire File System" software. |
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