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Variable diameter thermocouple

WRN series Variable diameter thermocouple Improved product structure is developed based on the conve…

Description：

、產(chǎn)品概述：">Productoverview:

WRN series Variable diameter thermocouple Improved product structure is developed based on the conventional thermocouple assembly, it is in the end part of the measurement by means of welding small protection tube, the measuring end part diameter reduced to 8 ~ 12mm in diameter, thereby overcoming the conventional response time is slow in the hot assembly. 。">Thermocouple is one of the most commonly used temperature sensor industry.

、工作原理：">Two, work principle:

。">WRN series <strong> variable diameter type thermocouple</strong> is two kinds of different materials of the conductor or semiconductor A and B welded together to form a closed loop. ，兩者之間便產(chǎn)生電動勢,因而在回路中形成一個大小的電流,這種現(xiàn)象稱為熱電效應(yīng)。">When two points of attachment conductor A and B 1 and 2 between the temperature difference between the two, will produce electromotive force, thus forming a size of the current in the circuit, this phenomenon is called the thermoelectric effect.

。">Thermocouples use this to work.

Three, application:

、蒸汽和氣體介質(zhì)以及固體表面溫度

。">WRN series <strong> variable diameter thermocouple</strong> can directly measure the production site of the presence of hydrocarbons and other explosive 0 to 1300 DEG C within the liquid, steam and gas and solid surface temperature. 、電子計算機(jī)的等配套使用。">Usually, and display instruments, recording instruments, electronic computers and other supporting the use of.

、熱電偶冷端的溫度補(bǔ)償：">Four, temperature compensation for thermocouple cold end of the:

，為了節(jié)省熱電偶材料，降低成本

，通常采用補(bǔ)償導(dǎo)線把熱電偶的冷端（自由端）延伸到溫度比較穩(wěn)定的場所

，連接到儀表端子上

。">The thermocouple materials are generally more expensive (especially the use of precious metals, and points to the instrument) are very far distance, in order to save the thermocouple material, reduce the cost, usually by the cold end of thermocouple compensation wire (free end) extends to the temperature relatively stable place, connected to the meter terminal. ，熱電偶補(bǔ)償導(dǎo)線的作用只起延伸熱電極，使熱電偶的冷端移動到儀表端子上

，它本身并不能消除冷端溫度變化對測溫的影響

，不起補(bǔ)償作用。">It must be pointed out that the thermocouple wire function only to extend the power pole, the mobile terminal to the cold end of the thermocouple instrument, it itself does not eliminate the influence of temperature change on the temperature of the cold end, do not play the role of compensation. ，還需采用其他修正方法來補(bǔ)償冷端溫度t0≠0℃時對測溫的影響。">Therefore, the need to adopt other correction method to compensate the cold end temperature of t0 = 0 degrees of temperature effect.

、優(yōu)點：">Five, advantages:

、測量精度高。">1, high precision measurement. 。">Thanks to direct contact with the object, is not affected by the intermediate medium.

。">2, wide measuring range. ，某些特殊熱電偶***低可測到-269℃（如金鐵鎳鉻）

。">The commonly used thermocouple from -50~+1100 C can be continuous measurement, some special thermocouple minimum measured to -269 degrees (such as gold iron nickel chromium).

。">3, simple structure, convenient use. ，外有保護(hù)套管

，用起來非常方便。">A thermocouple is usually composed of two different metal wires, and the limitation of size and opening, with protective sleeve, it is very easy to use.

、技術(shù)參數(shù)：">Six, technical parameters:

；">1, electrical outlet: M20x1.5, NPT1/2;

、連接尺寸：M20x1．5, NPT1/2

；">2, size: M20x1.5, NPT1/2 connection;

、防護(hù)等級：IP65；">3, protection grade: IP65;

、隔爆等級：d‖BT4, d‖CT5

。">4, every burst: D "BT4, D, CT5.

The formation and structure of seven kinds of thermocouple:

(1) the type of thermocouple:

。">The commonly used thermocouple can be divided into standard thermocouple and non standard thermocouple two categories. 、并有統(tǒng)一的標(biāo)準(zhǔn)分度表的熱電偶

，它有與其配套的顯示儀表可供選用。">The so-called standard thermocouple refers to the national standard, the relationship between the thermal potential temperature and allowable error, and indexing table standard thermocouple, which shows its supporting instrument available. ，一般也沒有統(tǒng)一的分度表

，主要用于某些特殊場合的測量

。">Non standard thermocouple in the range of use or magnitude are not standardized thermocouple, in general there is no unified indexing table, mainly used for measuring some special occasions. 、R、B

、K

、N、E

、J、T八種標(biāo)準(zhǔn)熱電偶為統(tǒng)一設(shè)計型熱電偶

。">Standard thermocouple according to IEC international standard production, and designated S, R, B, K, N, E, J, T eight standard thermocouple thermocouple for unified design.

，對它的結(jié)構(gòu)要求如下：">(2) the structure form of the thermocouple, thermocouple in order to ensure the reliable and stable work, the structure of its requirements are as follows:

；">Two the composition of thermoelectric pole welding thermocouple must be strong;

；">Good insulation should be between two thermode each other, to prevent short circuits;

The free end of the thermocouple compensation wire and connected to the convenient and reliable;

。">The protective sleeve should be able to guarantee the thermode fully isolated from harmful medium.

、選型代碼：">Eighth, code:

Model	category	The temperature sensing element Material Science	Scene display	Fixed mode	connection Box form	protect Tube diameter	Explosion proof mark	The inner core structure	Protective tube characteristics	Explain
W										Protective tube reducing (Zhongwei control)
	R									Thermocouple
	Z									Heat resistance
		M								Ni Cr Si Ni Cr - {N}
		N								Ni Cr Ni Si {K}
		E								Nickel - chromium {E}
		F								Iron copper - nickel {J}
		C								Copper copper - nickel {T}
		P								Platinum {Pt100}
		C								Copper {Cu50}
			Y							The field of liquid crystal display
				One						No fixed device
				Two						Fixed thread
				Three						Movable flange
				Four						Fixed flange
				Five						Adjustable pipe joint type
				Six						The fixed cone thread form
				Seven						Straight pipe type
				Eight						Fixed screw type pipe joint
				Nine						The movable screwed pipe joint type
					Two					Blowout type
					Three					Waterproof type
					Four					Explosion proof type
						Zero				With 16
						One				With 12
						Two				With 20
						N				Customer specified
							B			Flameproof
								nothing		The common element
								K		Armoured elements
									Five	With the size of 5
									F	Customer specified
W	R	N		Two	Three	Zero		K	Five	Typical model selection

、熱電偶I級按協(xié)議訂貨

；">Note: 1, according to the ordering protocol I thermocouple;
。">2, the protective tube is made of 1Cr18Ni9Ti material, the order according to the agreement.
Nine, design selection and ordering information:
、型號

；">1, model;
、分度號

；">2, division no.;
；">3, precision grade;
；">4, protection tube material and form;
、長度或插入深度

。">5, the length or depth of insertion.
Customer service service commitment:
、我公司所售中偉熱電偶系列產(chǎn)品在十二個月以內(nèi)出現(xiàn)質(zhì)量問題的

，負(fù)責(zé)免費維修

。">1, my company sold Zhongwei thermocouple series product quality problems within twelve months, responsible for free maintenance.
、質(zhì)保期內(nèi)如我公司產(chǎn)品出現(xiàn)任何質(zhì)量問題，我公司負(fù)責(zé)免費維修或更換

。">2, the warranty period if the products of our company have any quality problems, our company is responsible for free repair or replacement.

，造成產(chǎn)品損壞

，我公司負(fù)責(zé)維修，收取損壞部件成本費

。">3, the warranty period if the user use undeserved, cause damage to the product, our company is responsible for the maintenance, collect the damaged parts cost.

，我公司負(fù)責(zé)維修

，收取損壞部件成本費

。">4, after the warranty period of product quality problems, our company is responsible for the maintenance, collect the damaged parts cost.
、如用戶需我公司現(xiàn)場服務(wù)，對省內(nèi)用戶我公司服務(wù)人員12小時內(nèi)到達(dá)現(xiàn)場

，省外用戶48小時內(nèi)到達(dá)現(xiàn)場。">5, if the user needs to our service, our company in the province of the user service personnel arrived at the scene within 12 hours, arrived at the scene 48 hours outside users.

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