Basement Safe Humidity

The discussion about drying my silica gel stash prompted me to toss a Hobo datalogger into the safe along with the desiccant bag. We now have enough data to spot a trend:

Basement Safe Humidity - Oct-Nov 2011

Basement Safe Humidity - Oct-Nov 2011

Verily, one measurement trumps a thousand opinions: I was totally wrong about the door seal. Either that or the safe’s contents started out a lot wetter than I thought.

The basement humidity runs about 55% RH, pumped down by a dehumidifier in the summer and ambient air in the winter, which (I think) sets the upper limit. Modulo having hygroscopic stuff like paper in the safe, I suppose.

I’ll toss a fresh bag in there, tape over the door crack, and see what happens during the next month.

FWIW, the Onset HOBOware program doesn’t run under Wine and Wine doesn’t support USB hardware anyway, which is one of the few reasons I have a Token Windows Laptop. I’ve set it up to automagically export the data into CSV files, from which this went into OpenOffice 3.2 for a quick look. Surprisingly, HOBOware is a Java program, but evidently written specifically to avoid portability; they have Windows and Mac versions and that’s all. Worse, there’s no way to extract data from the loggers without using that program, because Onset doesn’t document the interface protocol. Enough said.

Memo to Self: measure it!

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  1. #1 by Aki on 2011-11-23 - 04:41

    “HOBOware is a Java program, but evidently written specifically to avoid portability;”

    National Instruments’ LabVIEW and LabWindows apps seem to run under Linux nowadays.

    • #2 by Ed on 2011-11-23 - 08:28

      A step in the right direction, indeed!

      Our Larval Engineer reports plenty of Linux in the dorms, so the tech crowd has gotten the message…

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