Metal bar on multiple thermocouple sensor will have what effect on thermocouple

I have tried to use the thermocouple and data recorder on the metal rods of heating temperature gradient ( 6) 。

plan is to use the bare thermocouple, so the actual contact with a metal thermocouple tip.

thermocouple sensor voltage generated recorder into the temperature reading. I don't know whether the sensor will interfere with each other because they are connected to the conductive surface?

to make the quality of the metal bar is far more than the quality of the thermocouple, the interference can be neglected. Separate thermocouple at least ( The thermocouple) 10 diameter. With small diameter of the thread that ties them together. Considering the thermocouple is fairly small, should not be difficult.

I don't think he means that the electrical interference, because each TC electrical connection to the metal bar.

data recorder specification table should be on whether or not the input isolated, or if it work with the grounding of TC.

if worse, worse, hang them both on recorder, touch them and see what happens.

thank you for your advice, this is my worry about electrical noise. I'll take a look at the data table, and touch the thermocouple tip, see if it leads to any change in the readings.

some of the teflon tape from pipeline department could work. It is a good insulator, the survival of very high temperature, it that the quality of the thin, light quality, but it is easy to Pierce. If you have to be careful to avoid puncture, it will be insulated thermocouple.

to measure the temperature should be between 100 ℃ to 200 ℃.

I did some measurements, through good conductivity between thermocouple do not seem to affect the readings.

I met the problem is, thermocouple, seem to require contact with clean bar.

I can to bring two thermocouples on the article about 1 cm, get 4 & deg; The change of C. To keep the thermocouple in the appropriate position with a bit of pressure makes the reading of the difference between each other is less than 1 ℃.

I plan to try a hot paste on the tip of the thermocouple, see if we can raise the rod between the thermocouple and thermal conductivity.

you can use a conductive heat pad easily be thermocouples insulated from each other, but must use specially designed for processing metal bar expected temperature of the cooling pad.

personally, I will click on a few small screw holes, and use the small screws to fix thermocouple connector on the metal bar. My guess is that you don't must be insulated from touching each other of the road. What you want is not moving good thermal contact. Better yet, use arc welding torch or ( TIG work well) The thermocouple welded to the metal bar. Note that you don't even need two thermocouple line contact - They can be a mm or apart, things should still work, As long as there is no temperature gradient in the bar) 。

if you use the method of screw thread hole, you find you need electrical isolation TC joint from the bar, you can use a thin dielectric washer ( Nylon is probably the most easy to find) 。 Omega sales in areas such as the thermocouple, and read in a variety of installation.