cackshifter Posted November 27, 2014 Share Posted November 27, 2014 Hi, I just wondered if anyone has an experience of these: http://www.ebay.co.uk/itm/161468452848?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT They look quite good value against the US ones, but maybe better the devil you know.... 1 Quote Link to comment Share on other sites More sharing options...
Team Idris Posted November 27, 2014 Share Posted November 27, 2014 The thing is accuracy, so you need something to calibrate it against at your measuring range. That could be another temperature set, or molten lead if it goes that high. Anything will do so you know what it is reading is something you can rely on. (Virtually nothing is 100% accurate, it's all about knowing how wrong it is). Quote Link to comment Share on other sites More sharing options...
Ex Member Posted November 27, 2014 Share Posted November 27, 2014 The thing is accuracy, so you need something to calibrate it against at your measuring range. That could be another temperature set, or molten lead if it goes that high. Anything will do so you know what it is reading is something you can rely on. (Virtually nothing is 100% accurate, it's all about knowing how wrong it is). The one shown uses a thermocouple. No calibration is ever needed. Personally I would suggest getting an Auber meter. They are low cost, save max and min and can have alarms. http://stores.ebay.co.uk/auberinstruments?_trksid=p2047675.l2563 Quote Link to comment Share on other sites More sharing options...
cackshifter Posted November 28, 2014 Author Share Posted November 28, 2014 The one shown uses a thermocouple. No calibration is ever needed. Personally I would suggest getting an Auber meter. They are low cost, save max and min and can have alarms. http://stores.ebay.co.uk/auberinstruments?_trksid=p2047675.l2563 Well ,yes. But you are in Canada. In the UK I can pretty much almost buy 2 of these for the price of 1 Auber by the time I pay for the weld in boss, plus international carriage and import duties, and they seem quite similar (and I need 2) Quote Link to comment Share on other sites More sharing options...
Team Idris Posted November 28, 2014 Share Posted November 28, 2014 "The one shown uses a thermocouple. No calibration is ever needed." Oooo, that's soooo not true They vary at the welded junction in the probe tip and the electronics measuring is very much a quality 'thing'. But the real critical part is repeatability. If it stays the same 'wrong' all the time you are only one home calibration away from knowing the right temperatures. Then a chepo unit does the job. Quote Link to comment Share on other sites More sharing options...
Ex Member Posted November 28, 2014 Share Posted November 28, 2014 A thermocouple will be accurate within a few degrees and that is more than accurate enough for this purpose. Quote Link to comment Share on other sites More sharing options...
Ex Member Posted November 28, 2014 Share Posted November 28, 2014 Well ,yes. But you are in Canada. In the UK I can pretty much almost buy 2 of these for the price of 1 Auber by the time I pay for the weld in boss, plus international carriage and import duties, and they seem quite similar (and I need 2) The one you linked to does not have a max/min memory or alarm capability. These are very important in this application. Shipping costs to Canada and the UK are exactly the same.... You do not need a weld in boss. You can simply drill and tap the manifold or EGR plate. Quote Link to comment Share on other sites More sharing options...
robertspark Posted November 30, 2014 Share Posted November 30, 2014 2p...(tin hat at the ready) The thermocouple they use is a k type thermocouple, which is basically two dissimilar metals soldered together that in turn produce a voltage that corresponds to the temperature at the junction http://en.m.wikipedia.org/wiki/Thermocouple Don't try to extend the wires with normal copper cable as it won't work The cost of thermocouple sensing has come down a hell of a lot with integrated circuit chips now that internally convert the minute voltage variance directly into a a linear voltage (or spi signal or other). Cost about £5 each. The chips also have internal ambient temperature compensation so again they are very accurate (within a few percent 12 to say 24 deg at 1200 degree C) The one in that meter is likely to convert the signal to a voltage which is inturn read by the voltmeter. The cost of voltmeter displays are also very cheap now I would suggest a search of flee bay to see what's available from china (which is where that particular example at the top of the page came from) and also search ebay.com for Chinese sellers as not all show up on .co.uk but they still ship international What do you intend to use it for? (Turbo application or tuning?) Rob Quote Link to comment Share on other sites More sharing options...
cackshifter Posted November 30, 2014 Author Share Posted November 30, 2014 I intended to use them for tuning, primarily, in the sense of getting settings that aren't going to melt something.However when towing I thought it might be useful to know what was happening to EGT as the engine works much harder then. I know the Auber ones do the job, but they are more expensive. However the UK origin(?) one is quite a bit bigger, so I think might be ruled out due to space considerations, and I like the alarm facility in the Auber ones Quote Link to comment Share on other sites More sharing options...
Team Idris Posted December 1, 2014 Share Posted December 1, 2014 Sounds fair. I've never bought a good quality 'thing' and wished I'd bought a chepo one instead But I've bought a lot of cheap stuff that had to be replaced with decent parts/gear. My new low budget Amazon hour meter didn't even work ! Quote Link to comment Share on other sites More sharing options...
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