<mailto:[EMAIL PROTECTED]> [EMAIL PROTECTED] wrote: does any one have info on homade thermocouples
If you are going to make your own thermocouple you will have to decide which metals to use for the temperature range you want to measure. Almost any different metals will create some kind of voltage but very low and nearly unmeasureable. Different combinations are good for different ranges of temps. Most common is type J made from Iron-Constantan and is good for most processes in biofuel manufacturing. If you make your own don't solder the wires together as this adds another alloy into the mix and will skew your voltages, melt the two wires together with a torch to form a very small ball at the end (junction) of the wires. Also you have to adjust for ambient temp which is also different for each thermocouple type. Then you will have to calibrate your new thermocouple (or find an output curve). The voltage output with change in temp is not linear, so the more temp references you make the better. Lastly you will need a very accurate digital voltmeter to be able to make a! ny sense of your readings. If this all sounds like too much you could just buy a thermocouple probe for $30 US or less. ------------------------ Yahoo! Groups Sponsor ---------------------~-~> We give away $70,000 a month! Come to iWin.com for your chance to win! http://us.click.yahoo.com/olMXHC/BJVCAA/4ihDAA/FZTVlB/TM ---------------------------------------------------------------------_-> Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html To unsubscribe, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
