This is a message from the Museumpests List. To post to this list send it as an email to [email protected] To unsubscribe please look at the footer of this email. ----------------------------------------------------------- Hi Mel,
Because of budget and time restraints, I went with 2 Lascar EL-USB2-Plus units for in-freezer, one at table height and one down on the floor. These seem to be reliable, rated from -35C. to +80C., and accurate to within ± 0.3C. This is stand alone, and must be plugged into a Windows USB port to download its data after the freezing period is complete (it works fine on our Macs running Windows 7 via Parallels). I set it to record T/RH at a 5 minute intervals for the 2 week duration. This gives a nice smooth graph with the included software, and downloads the data into Excel. Unfortunately this procedure halts any further recording, and then the unit has to be reset in order to log another run. They do make a neat wireless remote sensor that streams data to your PC, but this is only rated for -20 to +60C. Of course, -20 is sufficient for the purpose, but I was going for overkill. I got these from Fotronics/Test Equipment Depot in Melrose MA for about $95 each (781) 665-1400. In addition, just to keep an eye on things, I installed a remote T/RH sensor with an in-house monitor/alarm, made by General Tools (bought from Fotronics/Test Equipment Depot for about $75 for the two (sensor and monitor)). Two nights ago Amherst got down to 56F, and in the AM the monitor showed about -35C. inside the freezer. I can see the rise whenever the door is opened, but the freezer remains at least -20-23C. even when opened. I also put a sensor in our storage space. If I were doing this in-house on a more permanent basis, I would probably go with units from companies like Vaisala, which allow multiple sensors of various kinds with central realtime remote monitoring on a PC screen. Like many others, I explored all avenues. Heat was out of the question due to the nature of the materials. Anoxia was too slow, and the largest Nitrogen tent in my neck of the woods was too small for the volume of materials. Freezing fit the bill, but ultra-low temp biological freezers like the Revco models were way to small, even at 30 cubic feet. Neil ---------------------------------------------------------------------- To send an email to the list, send your msg to [email protected] To unsubscribe from this list send an email to [email protected] and in the subject put: "unsubscribe" - no quotes please. You are receiving the Pestlist emails in standard mode. To change to the DIGEST mode send an email to [email protected] with this command in the body: set mode digest pestlist Any problems email [email protected] or [email protected]
