From: NEAL LANGERMAN <neal**At_Symbol_Here**CHEMICAL-SAFETY.COM>
Subject: Re: [DCHAS-L] O2 Sensor Determination
Date: Tue, 17 Jul 2018 12:56:04 -0700
Reply-To: neal**At_Symbol_Here**CHEMICAL-SAFETY.COM
Message-ID: 008101d41e08$3a4b6be0$aee243a0$**At_Symbol_Here**chemical-safety.com
In-Reply-To <909B6171-19B1-47FE-B948-D19329A11CCD**At_Symbol_Here**drexel.edu>


This is a great teaching moment. Given the problem to a first term P-Chem class. Assume ideal behavior. Set 19.5 or 20.0 percent O2 as the level of concern.

 

Much more fun than someone else's calculator.

 

 

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From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU> On Behalf Of Bell,Martin
Sent: Tuesday, July 17, 2018 12:10 PM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: Re: [DCHAS-L] O2 Sensor Determination

 

Type in "Oxygen Depletion Calculator" in google. The first hit is a spreadsheet from warwick.ac.uk. It is a spreadsheet download that helps you determine the level of displaced oxygen.

 

 

Martin

 

From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU> on behalf of "Jeffrey R. Cogswell" <Jeffrey.R.Cogswell**At_Symbol_Here**DARTMOUTH.EDU>
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Date: Tuesday, July 17, 2018 at 2:53 PM
To: "DCHAS-L**At_Symbol_Here**PRINCETON.EDU" <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Subject: [DCHAS-L] O2 Sensor Determination

 

Does anyone have a good reference for determining when a room needs an O2 sensor? I'm looking for an amount of liquid gas (nitrogen, argon, helium) vs cubic feet calculation. (We're assuming total catastrophe here: no ventilation and all the cryo-liquid escapes). Dartmouth is looking at doing an overhaul of all the O2 sensors on campus. Facilities will oversee maintain/scheduling of these sensors and require a "hard and fast" rule from EHS to justify their installation.

 

Jeffrey R. Cogswell, Ph.D.

Chemical Inventory and Laboratory Resource Center Technician, EHS

37 Dewey Field Road, HB 6216

Hanover, New Hampshire 03755

P: 603.359.0128  F: 603.646.2622

http://www.dartmouth.edu/~ehs/

 

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