Gas Analyser U/S

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Gas Analyser U/S

This topic has 9 replies, 4 voices, and was last updated 10 August 2020 at 21:18 by Martin King 2.

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10 August 2020 at 16:53 #490018
Martin King 2
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@martinking2
Hi All,

Bought a bunch of instruments at auction last week and have started going through the items.

One is this O2 analyser for welding use.

It is supposed to have a 4 digit readout between 0 and about 25% (O2)

so should read approx 20.84 when fired up. With a new battery it shows this readout;

and nothing happens when the pump is used.

The main agent wants a whopping £150 for a new sensor which sound like a lot.

Would anyone know if these parts are available for other uses etc?

Any thought swould be much appeciated.

Regards, Martin
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10 August 2020 at 16:53 #32124
Martin King 2
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@martinking2
O2 analyser with problem
10 August 2020 at 17:03 #490020
Ian Johnson 1
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@ianjohnson1
It looks very similar to the sensors fitted in confined space entry multi gas detectors.

Try contacting hire shops who sell or hire Crowcon gas detectors or similar devices. I recommend you speak to the service dept guys not the sales office.

Edit: similar to those fitted to the Crowcon Triple plus+

IanJ

Edited By Ian Johnson 1 on 10/08/2020 17:11:26
10 August 2020 at 17:08 #490022
David Jupp
Participant
@davidjupp51506
Almost certainly the cell is exhausted. Typically an electrochemical cell, that is used up in presence of oxygen regardless of whether the device is turned on.

To extend life – some users cap the cell to keep air out, others nitrogen purge it after use.

Hardly mass market stuff, so won't be cheap. Is it an 'Analox' brand?
10 August 2020 at 17:19 #490024
Ian Johnson 1
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@ianjohnson1
Posted by David Jupp on 10/08/2020 17:08:26:

To extend life – some users cap the cell to keep air out

These are the same sort of people who put the detectors in plastic bags to keep them dry, and these are the same sort of people who die in confined spaces!
10 August 2020 at 18:24 #490036
Martin King 2
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@martinking2
Brand is MasterPurge 100
10 August 2020 at 18:55 #490040
not done it yet
Participant
@notdoneityet
Back a long time ago, we used an Orsat gas analysers. Electronic gas analysers were available (1970s), but the sensor cells were short-lived and very expensive. Electronics have got cheaper but the cells, while cheaper in real terms, still seem to be an expensive service item.🙂

Question might be: Will it work, even if you buy a new cell?🙂
10 August 2020 at 18:59 #490041
David Jupp
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@davidjupp51506
Ian, capping or purging the cell not only extends life, it gives much faster response time if measuring low oxygen levels (for example ppm of oxygen in hydrocarbon gases).

These sensors are used for a very wide rage of analysis – there's nothing wrong with capping or purging the sensor when it isn't being used. Obviously NOT if it is being used to continuously monitor breathing air.
10 August 2020 at 20:34 #490051
Ian Johnson 1
Participant
@ianjohnson1
That makes sense If it's not being used in confined spaces

IanJ
10 August 2020 at 21:18 #490056
Martin King 2
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@martinking2
MMmmmmmm! Going in the bin I think! Thanks for the info.

Martin
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