Date: Thu, 10 Jun 2010 18:02:55 +0200
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: Pierre Rouzaud <p.rouzaud**At_Symbol_Here**GMAIL.COM>
Subject: Re: CO Detector for Academic Lab
In-Reply-To: <4e4f.52bd808f.3941aac8**At_Symbol_Here**cs.com>

--000e0cdf16a4d215190488af275f

be careful with smokers ,they have until to 14% of HbCO in their blood,sometimes these values are disturbed by alcool or by diabetis Pierre ROUZAUD TOXICOLOGIST Presidnt TABAC LIBERTE 10 RUE DES ARTS TOULOUSE 2010/6/10 > The household detectors do not alarm in time to save your health, only your > life. They alarm at one of three levels: > > 100 ppm for <90 minutes > 200 ppm for <35 minutes > 300 ppm for <15 minutes > So theoretically you could be at 90+ ppm for ever and it still wouldn't > alarm. > > The OSHA PEL-TWA is 50 ppm > The ACGIH TLV-TWA is 25 ppm > > EPA says 9.5 - 12.4 ppm ave for 8 hours is unhealthy for sensitive groups > EPA says 12.5 - 15.4 ppm ave for 8 hours is just plain unhealthy. > > So I'd want a detector that would let me know at an ave of 10 ppm at 8 > hours or provides digital read out of peak levels on demand down to 10 ppm. > > Monona > > > > > > In a message dated 6/9/2010 3:03:11 PM Eastern Daylight Time, > mattlundgren**At_Symbol_Here**BOISESTATE.EDU writes: > > > It seems we have more and more labs wanting to work with carbon monoxide > and > I'm wondering when you require a detector and what type. Where do you draw > > the line for requiring a detector? Do you allow residential detectors for > certain > processes? When do you require a detector be linked into a communication > system for alarms, security, etc? Is this based upon quantity, the > process, all of > the above? The labs will have quantities ranging from 80-140 cubic feet in > a > single cylinder. > Thanks, > Matt > > > --000e0cdf16a4d215190488af275f


be careful with smokers ,they have until to 14% of HbCO in their b lood,sometimes these values are disturbed by alcool or by diabetis
=A0
Pierre ROUZAUD
TOXICOLOGIST
Presidnt TABAC LIBERTE
10 RUE DES ARTS
TOULOUSE
2010/6/10 <ACTSNYC**At_Symbol_Here**cs.com>
< font lang="0" size="2" face="Arial">The household detectors do not al arm in time to save your health, only your life.=A0 They alarm at one of th ree levels:

100 ppm for <90 minutes
200 ppm for <35 minutes
300 ppm for <15 minutes
So theoretically you could be at 90+ ppm for ever and it still wouldn't alarm.

The OSHA PEL-TWA is 50 ppm
The ACGIH T LV-TWA is 25 ppm

EPA says 9.5 - 12.4 ppm ave for 8 hours is unhealthy for sensitive grou ps
EPA says 12.5 - 15.4 ppm ave for 8 hours is just plain unhealthy.

So I'd want a detector that would let me know at an ave of 10 ppm a t 8 hours or provides digital read out of peak levels on demand down to 10 ppm.

Monona






In a message dated 6/9/2010 3:03:11 P M Eastern Daylight Time, mattlundgren**At_Symbol_Here**BOISESTATE.EDU writes:

It seems we have more a nd more labs wanting to work with carbon monoxide and
I'm wondering when you require a detector and what type.=A0 Where do you draw
the line for requiring a detector?=A0 Do you allow residential detectors fo r certain
processes?=A0 When do you require a detector be linked into a communication
system for alarms, security, etc?=A0 Is this based upon quantity, the process, all of
the above?=A0 The labs will have quantities ranging from 80-140 cubic feet in a
single cylinder.
Thanks,
Matt=A0=A0=A0=A0

< /div>

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