From: "Steve Magdic" To: "CHRIS MACK (E-mail)" Subject: FW: Kitfox-List: EGT Cold Joint Calibration point (Westberg types). Date: Friday, May 07, 2004 4:19 PM Chris, I took this off the KitFox site I joined. It has to do with the different types of EGT gauges and how they operate. Perhaps you could put this in the Tech Tips page? -----Original Message----- From: Torgeir Mortensen [mailto:torgemor@online.no] Sent: Thursday, February 12, 2004 3:50 PM To: Kitfox List Subject: Kitfox-List: EGT Cold Joint Calibration point (Westberg types). --> Kitfox-List message posted by: Torgeir Mortensen Hi Folks, You know, you can buy two different types of "SAME" EGT indicator, they look the same and no visual difference. So, what's the difference? The difference is in the instrument's P/N., and this tell you about the calibration temperature, or better, the temperature where the instrument is "most" accurate. There is two calibration temperatures, one at 32 deg. F and the other at 70 deg. F. The one calibrated at 32 deg. F. is identified with a "S" after the P/N., and the 70 deg. F. version has the P/N. without this "S" index. The "S" version is said to be used for snowmobiles, the other one is for our use, -or is it? Here is a link to Westberg site stating this: http://www.frostalarm.com/cat/clone.html Now, here is the question; Why is it necessary to have two calibration point? Lots of us, esp. those living in the "inland", can have temperature's qualifying for the "S" model in the winter, -and the "origin" we are using in the summer, agree? Can't we have just one calibration point for all conditions? A little to remember; An EGT thermocouple system is reading differential temperature, the different between the cold junction and our EGT probe. If the actual cockpit temp. is less than the "cal. temp." the indicator show to high reading, and if the cockpit temp. is higher than the "cal. temp." the instrument read to low. Also, the cold junction temperature is said to be the same as the cockpit temperature, is it? And-, how many of us have a thermometer for cockpit temperature? Well, you've got something to ponder about for the weekend (, if the weather is bad) :) ... Regards, Torgeir. _-======================================================================== _-= - The Kitfox-List Email Forum - _-= This forum is sponsored entirely through the Contributions _-= of List members. You'll never see banner ads or any other _-= form of direct advertising on the Matronics Forums. _-======================================================================== _-= !! NEW !! _-= ALL NEW LIST CHAT!! http://www.matronics.com/chat _-======================================================================== _-= List Related Information _-= Post Message: kitfox-list@matronics.com _-= UN/SUBSCRIBE: http://www.matronics.com/subscription _-= List FAQ: http://www.matronics.com/FAQ/Kitfox-List.htm _-= Search Engine: http://www.matronics.com/search _-= 7-Day Browse: http://www.matronics.com/browse/kitfox-list _-= Browse Digests: http://www.matronics.com/digest/kitfox-list _-= Live List Chat: http://www.matronics.com/chat _-= Archives: http://www.matronics.com/archives _-= Photo Share: http://www.matronics.com/photoshare _-= List Specific: http://www.matronics.com/kitfox-list _-= Other Lists: http://www.matronics.com/emaillists _-= Trouble Report http://www.matronics.com/trouble-report _-= Contributions: http://www.matronics.com/contribution _-========================================================================