From: Harry Elston <helston**At_Symbol_Here**>
Subject: Re: FW: RE: [DCHAS-L] Question
Date: Tue, 3 Oct 2017 12:10:31 -0500
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: 002201d33c6a$8a381ed0$9ea85c70$**At_Symbol_Here**
In-Reply-To <008801d33c62$57575880$06060980$**At_Symbol_Here**>

A few questions first:


  1. Why do they need “explosion proof?”
  2. Which PEL/TWA do they want it to alarm at?  Xylene = 100 ppm while EtOH = 1000 ppm
  3. Is it absolutely necessary that they have component separation – must distinguish between xylene and ethanol?  If that is the case, good luck because you’ll need some kind of separation column coupled to a detector, or…see below
  4. What are their accuracy and precision requirements?


If those are the only two components in the mixture (a very big “if), one very expensive way of doing it would be to rig a continuously operating photoionization detector in the room with a 9.8 eV lamp.  Xylene (m-Xylene, specifically) ionization potential is 8.56 eV while ethanol’s IP is 10.47 eV (Reference here is the NIOSH Pocket Guide).  I say expensive because you’ll be frequently performing calibration checks and replacing lamps.  According to a RAE technical bulletin a 9.8 eV lamp’s life is typically 1 year (though I could not see if that was “continuous use” or not – and I suspect “not”).  Good preventative maintenance programs will change out detectors at about twice the frequency of the manufacturer’s recommendation, so figure at a minimum, 2 lamps per year.




From: ACS Division of Chemical Health and Safety [mailto:DCHAS-L**At_Symbol_Here**PRINCETON.EDU] On Behalf Of Russ Phifer
Sent: Tuesday, October 03, 2017 11:11 AM
Subject: [DCHAS-L] FW: RE: Question


I’m putting this out to the List on behalf of an area hospital. Does anyone have any advice on this question?

Our lab has recyclers for xylene and ethyl alcohol.  I am trying to find an explosion proof external monitor to install outside the still room.  I would like to have the level set to alarm below the OSHA TWA level.  I have reached out to multiple vendors.  Some have not replied and some do not have a monitor for our needs.

Does anyone have any advice for her on equipment or vendors?


Russ Phifer

From: Groff, Alissa S [mailto:agroff**At_Symbol_Here**]
Sent: Tuesday, October 03, 2017 6:37 AM
To: rphifer**At_Symbol_Here**
Subject: Re: RE: Question

Absolutely, thank you and appreciate your help!
Alissa S. Groff, MT (ASCP)
Laboratory Safety Coordinator
Laboratory Services
WellSpan York Hospital
Phone: (717) 812-3598
Fax: (717) 851-4663


Thank you,


Alissa S. Groff, MT (ASCP)

Laboratory Safety Coordinator

Laboratory Services

WellSpan York Hospital

Phone: (717) 812-3598

Fax: (717) 851-4663



The information contained in this communication, including all attachments, is legally protected information, confidential or proprietary information, or a trade secret intended solely for the use of the intended recipient or otherwise exempt from disclosure under applicable state and federal law, including, but not limited to, privacy standards imposed pursuant to the federal Health Insurance Portability and Accountability Act of 1996 (“HIPAA”). The information may also be subject to legal privilege. If you are not the intended recipient, you are hereby notified that any use, disclosure, dissemination, distribution, forwarding, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender by reply Fax or e-mail stating the communication was "received in error" and delete or destroy all copies of this communication, including all attachments.

Message string: KqxfH=TU

--- For more information about the DCHAS-L e-mail list, contact the Divisional secretary at secretary**At_Symbol_Here** Follow us on Twitter **At_Symbol_Here**acsdchas

Previous post   |  Top of Page   |   Next post

The content of this page reflects the personal opinion(s) of the author(s) only, not the American Chemical Society, ILPI, Safety Emporium, or any other party. Use of any information on this page is at the reader's own risk. Unauthorized reproduction of these materials is prohibited. Send questions/comments about the archive to
The maintenance and hosting of the DCHAS-L archive is provided through the generous support of Safety Emporium.