From: Harry Elston <helston**At_Symbol_Here**midwestchemsafety.com>
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**midwestchemsafety.com
In-Reply-To <008801d33c62$57575880$06060980$**At_Symbol_Here**gmail.com>


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.

 

H

 

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
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
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**wellspan.org]
Sent: Tuesday, October 03, 2017 6:37 AM
To: rphifer**At_Symbol_Here**wcenvironmental.com
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
agroff**At_Symbol_Here**wellspan.org

 

Thank you,

 

Alissa S. Groff, MT (ASCP)

Laboratory Safety Coordinator

Laboratory Services

WellSpan York Hospital

Phone: (717) 812-3598

Fax: (717) 851-4663

agroff**At_Symbol_Here**wellspan.org

 


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