Re: [pestlist] question about freezingDear Kate Wellspring, We use a datalogger with display instead of thermometer, as we monitories Temperature and R.Humidity during the process. It is located inside the bubble, where we can also see the display with instant values from outside. We are using simple Gemini ones - you may find it @ www.preservationequipment.co.uk
Concerning the frequency of monitoring: - in the first step, when one need to do the anoxia atmosphere, we monitories twice a day. - after the parameters are ok - Oxygen, Temperature and RH, once or twice a week is enough. - we monitories O2% inside the bubble as well as inside the facilities where these controlled atmospheres are built, for safety reasons. Kind regards, Rui Marto Fonseca EXPM Lda. www.expm.com.pt Anoxia Disinfestations Systems - Integrated Pest Control Officers -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of kwellspring Sent: quarta-feira, 15 de Outubro de 2008 18:14 To: pestlist@museumpests.net Subject: Re: [pestlist] question about freezing What kind of thermometer are you all using and where can they be purchased? How often do you monitor the temperature? Thank you Kate Wellspring _____________________________________ Kate Wellspring Collections Manager Amherst College Museum of Natural History Amherst, MA 01002 (413) 542-2165 www.amherst.edu/museumofnaturalhistory On 10/15/08 11:40 AM, "Kaplan, Emily" <[EMAIL PROTECTED]> wrote: Hi Molly, You might also check resources on museumpests.net fact sheet on webbing clothes moth http://museumpests.net/whitesheets/default.php Fact sheet on low temperature treatment http://museumpests.net/tools/treatments/FINAL-Low_Temp_fact_sheet.pdf This fact sheet also includes references (Tom Strang's article in Collection Forum "A Review of Published Temperatures for the Control of Pest Insects in Museums." Collection Forum 8, no. 2 (1992): 41-67 gives lethal low temperatures for various pests and his CCI note is very helpful as well http://www.cci-icc.gc.ca/publications/ccinotes/pdf-documents/n3-3_e.pdf What kind of a freezer are you using? You might look at this document about modifying chest freezers to get lower temperatures http://museumpests.net/resources/modifying_a_chest_freezer_for_pest_control. pdf Best, Emily ---------------------------------------------------------------------------- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Margaret Geiss-Mooney Sent: Tuesday, October 14, 2008 7:46 PM To: pestlist@museumpests.net Cc: 'Molly Gleeson' Subject: RE: [pestlist] question about freezing Good afternoon, PestListers My understanding of the freezing process is that freezing if done correctly also kills the eggs, very important when you are dealing with infested textiles. Check out the following NPS ConserveOGram on freezing: http://www.nps.gov/history/museum/publications/conserveogram/03-06.pdf It appears that you do need to get that freezer temperature done to -20C for 48 hours. Rapid cooling to -20C is also necessary to assure a complete kill. The ConserveOGram covers the whole procedure very well. Depending on your budget and your staffing, perhaps anoxic treatment should be considered? Regards, Meg ._ _ _ _ _ _ _ _ _ _ _ _ ______ Margaret (Meg) Geiss-Mooney Textile/Costume Conservator in Private Practice in beautiful Northern California Professional Associate, AIC [EMAIL PROTECTED] ---------------------------------------------------------------------------- are in a freezer that is set at 0 F (-17 C). We are in the process of packing the other half in preparation to move them into the freezer as well. I would like them to be frozen in a freezer set to at least -20 C, however, the freezer company quoted exhorbitant fees for lowering the temperature of the freezer, even for only a few days. I'm concerned that -17 C isn't cold enough to ensure that the moths are killed, even if we keep them in the freezer for several weeks. Is this true? I'm also thinking that we should do a second freeze, to ensure that all life stages are killed, but if the temperature is not low enough, then maybe this is pointless. I plan to do a test by putting a bag of live moths/larvae into the freezer along with the objects, to monitor what's happening, but does anyone have any experience with this, or have any suggestions about adjusting the temperature and also about the recommended length of time to freeze at -17C to ensure mortality of the moths? No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.173 / Virus Database: 270.8.0/1724 - Release Date: 10/14/2008 2:02 AM
