docweathers Posted November 14, 2012 Report Share Posted November 14, 2012 I have a pyrometer that accommodates 1 type k probe. I would like to add a second probe by having a switch to go from one to the other. Is it sufficient to have a single pole double throw switch to change the connection for one of the probe leads (while the other one remains continuously connected) or do I need to use a double pole double throw switch to change the connection for both leads simultaneously. I asked the vendor and I got basically a "darned if I know" Thanks Larry Link to comment Share on other sites More sharing options...
neilestrick Posted November 14, 2012 Report Share Posted November 14, 2012 Both the positive and negative leads will have to be switched. There is no common. Link to comment Share on other sites More sharing options...
docweathers Posted November 14, 2012 Author Report Share Posted November 14, 2012 Will do Thanks Link to comment Share on other sites More sharing options...
Guest JBaymore Posted November 15, 2012 Report Share Posted November 15, 2012 If accuracy matters to you, it also needs to be a switch made for actual thermocouple switching. So for Type K use, the metals in the switch need to be Chromel / Alumel compatible. (and get the right wire to the right metal ;)src="http://ceramicartsdaily.org/community/public/style_emoticons/default/wink.gif"> on the switch) Copper components don't "cut it". Otherwise you create secondary thermocouples (two joined dis-similar metals) at the junctions between the thermocouple extension wire (which ALSO needs to be the correct stuff) and the switch. As the temperature in the area of the SWITCH changes,.... you create another set of electromotive forces...... and this impacts the reading that you will get on the meter. Gold and silver contacts on the good qulaity types of switches minimize this issue.....but make them pricey. http://www.omega.com/ppt/pptsc.asp?ref=OSW_SW14&Nav=temg16 Another potential solution is to use a simple patch panel. Not quite as elegant, but also works http://www.omega.com/ppt/pptsc.asp?ref=DRTB&Nav=temg16 best, ................john Link to comment Share on other sites More sharing options...
Mark C. Posted November 15, 2012 Report Share Posted November 15, 2012 It would be easy to just pick up a used fluke on e bay that has two meter leads-they run about 50-65$ Get the older box style I have three and they work great. Mark Link to comment Share on other sites More sharing options...
docweathers Posted November 15, 2012 Author Report Share Posted November 15, 2012 It would be easy to just pick up a used fluke on e bay that has two meter leads-they run about 50-65$ Get the older box style I have three and they work great. Mark That's a good idea. I'm not familiar with fluke pyrometer's. What model numbers are the old style box that you recommend? Link to comment Share on other sites More sharing options...
Mark C. Posted November 15, 2012 Report Share Posted November 15, 2012 Model Fluke 52-it takes two probes-from two source points. I also use the fluke 51-takes single probe You will need two yellow plugs that take the wire and plug into this meter. You can also get them from fluke These meters are cheap used on E-Bay- They are an older model but are well made and function well. Mark Link to comment Share on other sites More sharing options...
Mark C. Posted November 16, 2012 Report Share Posted November 16, 2012 Doc W when you are ready to get new burners heres a place I have been dealing direct with for 30 plus years on small cheaper venturi burners. Gas appliance Co phone# 951 940- 5252 They sell small MR 75,000 and MR 100,000 btu burners They are on several kilns I operate. Mark Link to comment Share on other sites More sharing options...
docweathers Posted November 16, 2012 Author Report Share Posted November 16, 2012 Doc W when you are ready to get new burners heres a place I have been dealing direct with for 30 plus years on small cheaper venturi burners. Gas appliance Co phone# 951 940- 5252 They sell small MR 75,000 and MR 100,000 btu burners They are on several kilns I operate. Mark It's my understanding that I would have to do a major overhaul of the manifold to accommodate these burners. Is that true? Link to comment Share on other sites More sharing options...
Mark C. Posted November 16, 2012 Report Share Posted November 16, 2012 Doc W when you are ready to get new burners heres a place I have been dealing direct with for 30 plus years on small cheaper venturi burners. Gas appliance Co phone# 951 940- 5252 They sell small MR 75,000 and MR 100,000 btu burners They are on several kilns I operate. Mark It's my understanding that I would have to do a major overhaul of the manifold to accommodate these burners. Is that true? That may be true-I do not know what it looks like exactly-the small burners are about 7 1/2 -8 inches long- New manifold is not that much to re-plumb if it fixes the kiln. I run 8 of the small ones on a 35 cubic foot car kiln so 4 would be plenty -if not overkill. Mark Link to comment Share on other sites More sharing options...
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