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Data Logger for Refrigeration
Price is right but I don't like the set 30 minute sample rate, the range or
the 4F accuracy. I (and I think Richard Kollmann) use the Onset Hobo dataloggers. For $200 including software it has RH, temperature and 2 external inputs. More expensive but you would have about the same amount in the Lascar units if you want to monitor the same things and a heck of a lot more flexible. You can monitor interior and exterior temps, humidity and with about $10 of parts cobble together a hall effect current sensor to monitor to amps used. Those are the 4 factors you need to monitor refrigerator efficiency. You can set the sample period anywhere from .5 seconds to several hours,accuracy is about +-1F, or 4 times better and the battery lasts up to 5 or 6 months. Support is really good too. Their tech actually designed the current sensor for me and pointed me to where to get the parts. -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com "GBM" wrote in message ... I would like to do some testing on our Refrig unit. Minimum would be to monitor icebox temperature and voltage to compressor so that I can see on-off cycle and resulting temperature vs time for a 1-2 day period. If possible, I would like to add current to compressor and temperature in area where compressor/condenser is located. Since this is just a fact finding test, I would like to keep the cost down. I have seen individual USB temperature and voltage loggers at Lascar Electronics. For example: http://makeashorterlink.com/?V2BD2567D and http://makeashorterlink.com/?P5CD2567D Does anyone know of a Canadian or US source and especially for a unit that might accept several inputs? Someone suggested earlier on rec.boats.cruising that I just use a video camera, but I need to do this over 24-48 hrs to determine why my refrig controller at times seems to go into hibernation! Any ideas welcomed. GBM |
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