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AIR46C - The Preparation and Use of Chromel-Alumel Thermocouples for Aircraft Gas Turbine Engines

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Document Number: AIR46C
Project Initiation: 11-05-2011
Project Number:
Revision Number: C
Sponsor Name: Barry Robinson
Title
The Preparation and Use of Chromel-Alumel Thermocouples for Aircraft Gas Turbine Engines
Scope
This SAE Aerospace Information Report (AIR) reviews the precautions which must be taken and the corrections which must be evaluated and applied if the experimental error in measuring the temperature of a hot gas stream with a thermocouple is to be kept to a practicable minimum. Discussions will focus on Type K thermocouples. These are defined in NBS Monograph 125 as nickel-chromium alloy versus nickel-aluminum alloy thermocouples.
Rationale
Following a review of all E-32 documents related to temperature measurement there is an opportunity to reduce the number of standard, as discussed during the fall 2010 commitee meeting. AIR1900 has been updated to incorporate ARP464, ARP465 and ARP485. AIR46 will be updated to incorporate AIR65, ARP690 and ARP691, the docuemen will therefore focus on just Type-K thermocuples, but all recognised thermocouple types.
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