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Thank you. I will try this next and post the results. Thermocouples #1 and #2 are in single 10-gallon tanks that are part of 2 separate series flow loop systems (you can sort of see how the systems are set up in the 2nd and 3rd pictures of my 4 Aug 21 13:43 post). Both of these systems are...

Thank you all for the replies. I recorded some new data with the setup shown in my previous post. Unfortunately, the box did not remove the noise. I also recorded some data using an identical datalogger in an un-air-conditioned warehouse, and compared it to the original data from the...

I have insulated the logger in a cardboard box with packing paper. The box isn't large, but if insufficient ambient temperature compensation is the culprit, I should at least get a reduction in the noise, if not outright removal, correct? See pictures of the system below. All water is saltwater...

@itsmoked What size are the aquariums? Two are 10gal (38L) and one is ~50 gallons (200L). The fourth probe is in ambient air. Residential or commercial? Commercial. Town location? Melbourne, FL (east coast, south of Cape Canaveral) @waross Is the data logger temperature compensated? I don't...

I am using a 4-channel thermologger (AZ Instruments model #88598) that uses K-type thermocouples. The data is fine for about half of the day, but between about 8pm and 9am (overnight), all 4 channels rise and fall in a sine pattern with a period of about 40 minutes and an amplitude of ~5 degrees...