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 Post subject: Infra-red thermometers
PostPosted: Fri Mar 22, 2013 3:21 pm 
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Location: near Baulkham Hills, NSW
There was a thread a while back where I listed a jaycar one for $50.

Her's one like I just bought from my local bearing shop:
http://microtempusa.com/micro-temp-ther ... mt100.html

A$29 he sells for, cheaper for ca$h... :wink:

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PostPosted: Fri Mar 22, 2013 3:28 pm 
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Nice and cheap that!

As the text in the link states, these fixed emissivity readers are only correct for rough, dark surfaces. For a tyre they would be great. For the surface of a brake rotor they would be quite inaccurate. For things in between like a hot exhaust, their accuracy would depend on the surface coating of the object being measured.

Just because it has a digital readout with many digits doesn't meant the number is right.

M


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PostPosted: Fri Mar 22, 2013 3:30 pm 
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All I bought it for was radiator temp so it should be OK. or near enough... :wink:

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


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PostPosted: Fri Mar 22, 2013 6:46 pm 
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drmini in aust wrote:
All I bought it for was radiator temp so it should be OK. or near enough... :wink:


Gawd!! Issy would be horrified at what you Boffins are doing to his beloved Brick :shock: :lol:

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PostPosted: Fri Mar 22, 2013 6:59 pm 
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9YaTaH wrote:
drmini in aust wrote:
All I bought it for was radiator temp so it should be OK. or near enough... :wink:


Gawd!! Issy would be horrified at what you Boffins are doing to his beloved Brick :shock: :lol:

It allows me to check the accuracy of the Verrrry British Smiths temperature gauge and its 1950s (40s?) design `voltage stabilizer' :lol:

Also handy on the street for checking whether chicks are hot, or not...:mrgreen:

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


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PostPosted: Sat Mar 23, 2013 5:50 am 
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Mokesta wrote:
Nice and cheap that!

As the text in the link states, these fixed emissivity readers are only correct for rough, dark surfaces. For a tyre they would be great. For the surface of a brake rotor they would be quite inaccurate. For things in between like a hot exhaust, their accuracy would depend on the surface coating of the object being measured.

Just because it has a digital readout with many digits doesn't meant the number is right.

M

The reading I've done (which I'm damned if I can find now) indicated that while they are less accurate measuring 'reflective' surfaces, this error will be quite small %-wise. This seems to be the case testing the unit I have - if I check a variety of surfaces sitting at room temperature, including everything from gloss tiles to wood to paper to carpet, the variance is less than half a degree. This has been true outside in winter (less than 10c) and summer (over 30c inside).


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PostPosted: Sat Mar 23, 2013 9:05 am 
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We used raytek temp readers with defence as they were compact and gave accurate readings. I suppose it is a moot point having one when you are seeing the paint blistering off a ships bulkhead though :lol:

Hooroo

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