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Mine Exploration Forum

Author What gas monitor?
Earth Worm Jim

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Joined: 12/02/2010

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What gas monitor?
Posted: 13/05/2010 13:41:07
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Like the title says. What gas monitor?

Single, double, triple, quad, I don't care. I want a good one at a fair price.
IP: 86.133.200.42
SimonRL

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Joined: 27/11/2005
Location: North Wales

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What gas monitor?
Posted: 13/05/2010 14:51:55
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There was a thread about this a while back after myself and James Cartwright had a near death experience... Might give some points? Although if anybody has any other recommendations please feel free to add them here Smile

[web link]
IP: 83.148.135.213
Earth Worm Jim

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What gas monitor?
Posted: 13/05/2010 15:02:46
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Cheers, having a look now.

Having spoken to one of the guys on hear over the weekend, I've realised that my cavalier attitude to gas could get me into a lot of trouble and make the people who love me very sad.
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rufenig

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Joined: 18/03/2008
Location: Shropshire Hills

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What gas monitor?
Posted: 23/01/2015 07:46:29
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There is a missing word!
CALIBRATED

I know that people will come back saying their meter "self calibrates" but I still believe that they should be checked properly against a standard gas mix.

There is a school of thought that says a O2 meter shows enough information and is simpler.

If you even suspect Methane then the best advice is stay out!

A CO2 facility is worthwile, but not common and usually expensive.
Smartass I.M.H.O. Smartass
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staffordshirechina

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Joined: 15/11/2009
Location: North Staffordshire

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What gas monitor?
Posted: 23/01/2015 08:22:29
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I use BW gas alert, both home and work.
My work one has carbon dioxide on it as well and for work use is essential. However, it adds about 500 quid to the price so a non starter for home use. They are not common second hand either.

However, for home use I have the same unit but with oxygen, LEL, CO and H2s. I got it three weeks old for £80 from ebay, should be nearly £400.
I have another older one that was £25.

My work unit is calibrated for oxygen, my home units are self calibrate. You can alter this in the settings.

Self calibrate is OK but you must remember to turn the unit on outside the mine. If you wait until you need the meter, then turn it on, you get a false base reading!

There is one unit on ebay now that 'looks' OK see item 191484594222

Les
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Tony Blair

Joined: 23/07/2012

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What gas monitor?
Posted: 23/01/2015 09:09:28
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Be careful.

Look at the wording of this description:-

http://www.ebay.co.uk/itm/Bw-Microclip-Xt-/131396226224?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item1e97d34cb0

Comes with a 6 or 12 month calibration certificate. This guy does give a 12 month warranty, which is good of him. Some don't. I had a beautiful brand new looking BW 4 gas which needed a new O2 sensor, so rather than pay the £180 or so for a new sensor, calibration and headache, I decided to buy a similar one in bashed up condition with marker pen on it with "fresh" internals. I swapped the clothes over and it was great......when the O2 sensor ran out, the ebay gripe period was over. If you get the gubbins, you can set a 12 month calibration period without calibrating it, or 24 month, or whatever you like.

The BW meters are good, since the computer wire, program, interface and size of the thing is good. They also come with a calibration cap for rigging up your gas mix.

I had an interesting idea, which would prolong things.

The O2 meter generally works on the principle of some stuff oxidising and that realising an electro potential, which automatically calibrates on startup and as the O2 level drops, so does the P.D. against a calibration curve. When the sensor is farooked, it fails to power up because there is no voltage and that's the end of your sensor. It follows that there is enough material to last 2 years in 20.9% O2. It would follow that there was some sort of relationship where the life increases at lower levels. SO, using a bag and a suitable oxygen scavenger, it should be possible to store the meter in an atmosphere tending to 0% O2 and enjoy years of oxygen sensor life.

NB:- It would probably be an idea to leave it out a bit to get a good surface saturation of the sensor to avoid silly readings!!!
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Wormster

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Joined: 15/08/2006
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What gas monitor?
Posted: 24/01/2015 09:53:51
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We used to store our o2 and toxic gas sensors in a fridge when i worked in the industry!

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