High Temperature Thermistors or RTD's
High Temperature Thermistors or RTD's
(OP)
I am trying to find what is available in high temperature thermistors or RTD's. I have read in some literature (10 Reed's Marine Engineering Series - Instrumentation and Control Systems) that through special compositions thermistors can be made to detect ranges up to 1600ºC. For my application I would be looking for a device that can handle continuous operation at 1100-1200ºC with excursions up to 1300-1400ºC. I am having difficulty finding anything remotely close to this and was wondering if anyone has any idea if something like this exists. I'd prefer a thermistor or RTD as they are the more common use is automotive applications. I know thermocouples can measure this but would prefer not to use one. Thanks in advance for any help you can give.





RE: High Temperature Thermistors or RTD's
This is as close as I think you will find:
http://www.dwmai.com/bodylow-new.html
Thermistors are usually made via a sintering process... Heating them to those temperatures will no doubt screw with the whole design.
Better start thinking creatively about T/Cs.. They are so cheap and 1200C is idling along balmy for them.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: High Temperature Thermistors or RTD's
RE: High Temperature Thermistors or RTD's
http://instserv.com/rmocoupl.htm
Why are you biased against t/c's? They are used in high temperature service in much tougher environments than anything automotive could ever imagine - heavy process, petrochem, power generation, steel production... the key is buying good quality thermocouples from reliable suppliers. Signal conditioning for t/c's isn't remotely challenging for modern electronics - I wouldn't worry too much about the interfacing.
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Sometimes I only open my mouth to swap feet...
RE: High Temperature Thermistors or RTD's
RE: High Temperature Thermistors or RTD's
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: High Temperature Thermistors or RTD's
RE: High Temperature Thermistors or RTD's
Type K is by far the most common, and would be your best bet for a slightly oxidising atmosphere up to about 1250C.
What is your application?
RE: High Temperature Thermistors or RTD's
EGTs are typically much lower temperature than that - most turbines are quite happy with type K for EGT measurement. I wonder if military aircraft measure afterburner EGT?
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Sometimes I only open my mouth to swap feet...
RE: High Temperature Thermistors or RTD's
The application is an aftertreatment device for exhaust systems.
RE: High Temperature Thermistors or RTD's
RE: High Temperature Thermistors or RTD's
http://www.accutru.com/ExLCCover.pdf
Have you considered any of the non-contact methods such as optical pyrometry or one of the emerging technologies such as laser-absorption radiation thermometry (LART)?
What service life do you need, and what conditions will the sensor be exposed to? Is this a laboratory automotive test rig, or something which will be fitted to a vehicle and see the rough and tumble of an outdoor environment with vibration and shock / impact hazards?
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Sometimes I only open my mouth to swap feet...