Thread: DIY Data-Logger
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Old 05-22-10, 11:29 AM   #19
cmroseberry
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Join Date: May 2010
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The least expensive datalogger I have found is an OM-44 from Omega Engineering for $104. Temperature sensors for this logger are $33 (OM-40-C-HT-B). Omega also has a wealth of free tech literature about measurements and data acquisition. The OM-44 does not yet have a Windows 7 driver. I have several OM-44 set aside for field testing my WarmSpring pool heaters. A small cheap data acquisiton system worth considering is a DATAQ DI-194RS. DATAQ offers these as very inexpensive start-up kits. Unlike the dataloggers, this data unit cannot stand alone; it has to be connected to a computer. For small signals, like thermocouples, the signal will have to be amplified to give good resolution for the data aquisition system's 0-10 V measurement range.

After pulling my hair out for years trying to get rid of noise on thermocouple signals, I now favor RTD's and temperature sensing integrated circuits such the Analog Devices AD-592. These transducers are inherently less susceptible to noise.
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