On Sat, 09 Jan 2021 13:06:29 +0000, Theo wrote:

David wrote:
We have a mains powered CO tester in the same room as our log burner.

However I am wondering if there is a sensitive portable CO tester which
is good.

https://www.amazon.co.uk/Handheld-Mo...ector-0%EF%BD%
9E1000ppm/dp/B08CSLLXVC/
is an example after a quick search.

The main question is if these detectors are more accurate/sensitive
than the ones designed for permanent installation.

There are 'personal gas detectors', eg:
https://uk.rs-online.com/web/c/?
limit=100&pn=1&r=t&searchTerm=monoxide&sra=oss

I think I would trust those that have calibration against some standard
over random-brand Chinese ones from Amazon.

(for a similar reason, I don't buy unbranded smoke detectors from ebay)

A randomly selected one:
https://docs.rs-online.com/6faf/0900766b803e8cee.pdf is specced at:

Type of sensor:electrochemical, specifically for CO.
Calibration of the sensor:calibrated by the manufacturer with
asource at 205 ppm.
Measuring range :Nominal: from 0 to 1000 ppm (2000 ppm for amaximum
period of 5 minutes).
Accuracy:+- 5% of the reading +- 5 ppm (from 0 to 1000ppm).
Response time: 70 seconds to 90% of the measurement Long-term
drift:5% per year, depending on the frequency of use

Theo

Cheapest is about £130 (didn't check for VAT and shipping).
Wondering if a cheapo one would be "good enough".
That is, not accurate enough to certify a gas boiler after service or give
a detailed read out but to enough to discriminate between:

Not very much

Hmmmm.....

Oh, ****!

It is making a wall mounted one with a read out (not just warning beep)
look like a potential option.

Cheers



Dave R



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