HIGH temp measurement.
HIGH temp measurement.
(OP)
I'm working on a test rig for a new heat exchanger that will see temps up to around 1700 F. My medium is He, so I'm concerned about leakage. What's the best way to take temperature readings at this temperature?





RE: HIGH temp measurement.
RE: HIGH temp measurement.
RE: HIGH temp measurement.
13 mm pipe, I guess it depends on the wall thickness
what is the velocity and how well is the tubing insulated? radiation is going to be a big problem
RE: HIGH temp measurement.
RE: HIGH temp measurement.
RE: HIGH temp measurement.
i am using a series of radiation heaters around my piping to achieve my temperatures and my heaters are right next to the location i will need to read. won't this make IR ineffective?
RE: HIGH temp measurement.
I would like to add that Helium is an inert gas: non reactive chemically to other compounds even at elevated temperatures. If the Helium gas flow is clean enough you should be able to use a thermocouple placed directly in the flow without chemically reacting away the thermocouple. You probably should take into account the radiation loss of the thermocouple mass. However a simple, single radiation shield should solve this problem.
We use: Thermocouple type C W-5% Re/W-26% Re for temperature measurements in vacuum well above your 1700 F (1200C)
Best regards
Onno
RE: HIGH temp measurement.
One big factor that you left out is accuracy and response time. If high accuracy or fast response is needed you will end up with an exposed thermocouple. The next step down in accuracy/speed would be a thermocouple in a thermo-well. Then lastly you have a thermocouple clamped to the pipe or an IR sensor.
ISZ
RE: HIGH temp measurement.
http://www.omega.com/temperature/pdf/os1592.pdf
Anecdotal:
Prior to Vanzetti being absorbed by Omega I was talking to the headman about a possible temperature measurement on the expander wheel tips in our HNO3 plant. I told him the conditions 12500 RPM at 250 psig with a temperature of 1200F. There were 12 blades on this particular. His immediate response was do you want an average of all the tips or individual tip temperatures. We went on to measure individual tip temperatures.
RE: HIGH temp measurement.