Thermocouple wiring with a Voltage Divider

[JLocke]

Sorry about the confusion of these two terms. What we really need is ACCURACY in terms of having very accurate measurements of our temperature.

We have a mixture of gases in a cylinder and we are going to heat that up through a heating tape up to 92 C. What we are looking is to control that temperature in order to tell the heating element whethet to supply more heat or not according to the temperature measurement. That's why it is so important to have an appropiate accurate measurement of the actual temperature.

Thermocouples seem to be the easier solution since they can be introduced to the cylinder with no problem. The drawback is the error we might obtain and thus we want to improve that, the problem is that I am not sure how.

JL

[johnsold]

Please put some numerical values to your accuracy requirement.  That makes it much easier to give recommendations.

Are the gases in the cylinder mixed or stirred in some way? Is this a continuous, flow-through process or closed batch process? If a flow process, what is the flow rate? What is the rate of heating? How much overshoot can the process tolerate?  Are chemical reactions ocurring in the cylinder?  How large is the cylinder? How many temperature sensors will be used?

Lynn

[JLocke]

Well if the accuracy could be between 0.1-0.5 degree C that would be great.

We are mixing in a cylinder water and methane. We will heat up that mixture up to 92 C at 1 atm. We want to keep those conditions throughout the entire process, since the outlet of the cylinder is a heated line which goes straightly to the fuel cell. So concerning the cylinder itself, we are just having a temperature sensor. The flowrate of methane is around 200 SCCM.

Hope this helps

JL