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The CDT probe which measure the air temperature flowing over it. The Compressor Discharge Temperature (CDT) probe (not to be confused with Conductivity Nike Air Max Sale Online , Temperature, Depth probe used in ships and also called CDT probe), is installed in the engine compartment just after the inter-cooler. The probe is installed with a #40 stainless steel clamp. A large clamp is supplied to fit around the air-port leaving the inter-cooler.

A typical CDT probe kit from J.P Instruments includes the thermocouple type ‘K’ CDT Probe, a stainless steel clamp thimble, one stainless steel exhaust seal washer and one stainless steel screw type clamp.

Working of the CDT in an aircraft: The CDT probe senses compressor discharge temperature of the aircraft compressor and for this purpose, the probe is mounted external to the flow path that receives high pressure air discharged from the compressor. This air flows past at least one thermocouple which in turn measures the high-pressure air temperature and the high-pressure air is then returned to the flow path.

Basically, air from the compressor is discharged through a hole bored into the engine case. This air is then channelled into a housing containing the CDT probe which measure the air temperature flowing over it. The CDT probe in turn sends an electrical signal to the connected Aircraft Engine Monitors or electronic control unit which in turn indicates the compressor discharge temperature to the pilot. The air is then vented to a sink pressure and can be used as cooling or purge flow.

The purpose of wanting to know the comp discharge temp is to prevent chances of detonation that can happen due to excessive heat. The intercooler cools the air so much that the limit temp is never reached, or even approached, so the original equipment CDT gauge becomes irrelevant. Fundamentally you want to know the inlet temp limits for the engine and the temp of the air at this point. If the CDT is below this temp, you are fine. If CDT is above this, it depends on the conditions and the efficiency of the intercooler (or aftercooler as is technical called ).

As we are aware, CDT can be critical under certain circumstances e.g. staging a dual annular combustor for a high bypass turbofan commercial jet engine where fuel-to-air ration can be critical.

JPI CDT probes are superior because of their response speed. Ungrounded (insulated) probes sold by rival manufacturers are too slow to respond to all temperature changes. It is also worth noting that insulated probes, starting at the same point as grounded probes, never achieved true temperatures. The ungrounded, insulated probes are generally 316" in diameter whereas, JPI's grounded probes are only 116" in diameter. The Aircraft Fuel Flow indicator manufactured by the rivals have more surface are and therefore lose energy a rate of T' This is another reason JPI uses thin probes and not sluggish probes.

Also, JPI's grounded probes are manufactured using a space-age material, Hastaloy-X, that can withstand the harsh sulphur atmosphere of temperature exhaust gas and uses them in all its gages.
Former British Prime Minister Tony Blair on Thursday warned voters that time was running out to reverse Brexit, a folly he said would torpedo Britain's remaining clout and be regretted for generations to come.

　　FILE PHOTO: Britain's former Prime Minister Tony Blair speaks at a meeting of the European People's Party in Wicklow, Ireland, May 12, 2017. REUTERSClodagh Kilcoyne

More than a year and a half since the 2016 Brexit vote, the United Kingdom remains deeply divided over the planned EU exit that Prime Minister Theresa May says will take place on March 29, 2019.


Both opponents and supporters of Brexit agree that the divorce is Britain's most significant geopolitical move since World War Two, though they cast vastly different futures for the $2.5 trillion UK economy and its relation with the world's biggest trading bloc.


Blair, Labour prime minister from 1997 to 2007, said Britain would be poorer, weaker and warned that May had solved none of the problems over Northern Ireland's post-Brexit status.


"We are making an error the contemporary world cannot understand and the generations of the future will not forgive," Blair said in an article published on his website on Thursday.


"2018 will be the last chance to secure a say on whether the new relationship proposed with Europe is better than the existing one," Blair, 64, said.


Leaving the European Union was once far-fetched: just over 15 years ago, British leaders such as Blair were arguing about when to join the euro, and talk of an EU exit was the reserve of skeptics on the fringes of both major parties.


But the turmoil of the euro zone crisis, fears in Britain about immigration and a series of miscalculations by former Prime Minister David Cameron prompted the United Kingdom to vote 52 to 48 percent for Brexit in a June 2016 referendum.


Blair has repeatedly called for reversing Brexit, echoing other opponents of Brexit such as French President Emmanuel Macron and billionaire investor George Soros, who have suggested that Britain could still change its mind.


So far, opinion polls show little sign of a change of heart and it is unclear how Brexit could be stopped if both major political parties officially support the divorce.


Half of Britons support a second vote on whether to leave the European Union and a majority think the government may be paying too much money to the EU to open the way to trade talks, according to an opinion poll published last month.


Supporters of Brexit dismissed Blair and said he was undermining both the British negotiation and the will of the people.


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