On 10/25/2013 3:01 PM, David C. Hallam wrote:
If you want to read about how poisonous co2 is, look up the story about
the African Lake Nyos disaster in 1989 in Cameroon.
CO2 is not normally poisonous. Don't mistake suffocating for poison. It
replaces the Oxygen in the air. You continue to breathe, but get no
oxygen and never notice the difference.
It is why I mentioned CO2 detectors for vessel entry, but it was
actually Oxygen monitors required, not CO2 detection.
When entering a vessel in the US, or even hole or elevator shaft at the
base in the ground over a given depth you must first check the Oxygen
level. THEN you may not enter (even if it shows the Oxygen level is
safe) until you have a monitor "outside the vessel/pit And you are
securely fastened to a rope or cable with a harness AND enough man power
outside the vessel /pit to pull you out should you cease talking to the
people outside. You stop responding and you are coming out, even if it
was because you got tired of talking and that is not a fun way of
leaving a vessel.
The US has very strict rules and regulations about vessel and pit entry.
Again, it is because the CO2 displaces the Oxygen because it is notably
heavier than most of the gases that make up the air we breathe. We
cease functioning when the level of Oxygen drops only a few percent. We
suffocate. We are not poisoned.
In years past, when working in instrumentation I spent many a time on
the end of that rope, working on instruments in pits, tanks, and holes
in the ground.
It's unfortunate that popular programs on TV do not make the distinction
between poisoning and suffocation either leaving the impression, or
outright calling CO2 a poison. Yes, the result is the same. You are
dead, but with CO2, if retrieved soon enough, you can be resuscitated.
That being said, exposure to high levels of CO2 for long periods with
enough Oxygen to breathe, you will end up with acidification of your
blood and that is considered a poisonous aspect of CO2 by some. Whether
this is actually poison is still debated. It's rare and not the cause
of death in the elevator shaft, or the lake "turning over" either from
vulcanism or temperature changes.
Suffocation due to lack of oxygen comes with no warning whether the CO2
displacement is fast or slow. The victim simply looses consciousness,
almost as if going to sleep, which is why CO2 is called a silent killer.
Blood acidification is rare.
73
Roger (K8RI)
David
KW4DH
On 10/25/2013 2:51 PM, w5gn@mxg.com wrote:
Most interesting that today, in Ireland, there was a news report
that two workers who had died (recently, not today), and the analysis
was that they died due to CO2. They were at bottom of an enclosed
elevator pit, and the report was that subsequent tests showed
there was insufficient oxygen due to a high density of Carbon Dioxide.
Tried to find a printed link, but only saw the report on the RTE Six-One
TV news.
Barry, EI/W5GN
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of Roger (K8RI)
Sent: Wednesday, October 23, 2013 10:51 PM
To: rfi@contesting.com
Subject: Re: [RFI] CO2 detectors and RFI
On 10/23/2013 5:10 PM, dalej wrote:
Just a heads up.
I purchased a Kidde NightHawk CO2 detector model KN-COP-DP-LS, it is
designed to plug into a wall outlet plus it has a 9 v. battery backup
and LED readout. While transmitting on 80 meters after a while it
starts audible warning, very loud. I called the company tech support
line and they did not have any solution. As an experiment I plugged
the detector into a two wire extension cord and wrapped the extension
around a #31 mix snap-on, then tested and it did not go off. The
tech support said not to use an extension cable with the detector.
CO2 or CO? Not many homes worry about CO2. Only detectors I'm
familiar with are for vessel entry.
73
Roger (K8RI)
So if you are looking for a CO2 detector be aware of this problem
with 80 meter RFI tripping the detector. I went to strictly battery
powered CO2 detector and that works fine.
Dale, k9vuj
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