Product Name: wrnk-391-02 armored thermocouple
Product No.: 134838-792
Product model: wrnk-391-02
Updated on: July 1, 2009
Manufacturer: thermocouple, thermal resistance, bimetal thermometer, polytetrafluoroethylene, PTFE gasket -- Shanghai Feilong instrument and Electrical Co., Ltd
Customized: can be customized according to the needs of customers
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Product details
Wrnk armored thermocouple   

Model, division number and recommended temperature of armored thermocouples of different materials and diameters

Electrode materials	Model	Graduation	Shell material	Shell diameter（mm）	Recommended operating temperature ℃
					Maximum temperature for long-term use	Maximum temperature for short-term use
Nickel chromium -- nickel silicon	WRKK	K	GH3030	0.25;	300	600
NiCr-NiSi	(WRNK)			0.5;1.0	500
				1.5;2.0;3.0	800	900
				4.0;4.5;5.0	900	1000
				6.0;8.0	1000	1100
			1Cr18Ni9Ti	0.25;	300	600
				0.5;1.0	400
				1.5;2.0	600	700
				3.0;4.0;4.5	800	900
				5.0;6.0;8.0
Nickel chromium silicon -- nickel silicon	WRNK	N	GH3030	0.25;	300	600
NiCrSi-NiSi	(WRMK)			0.5;1.0	500
				1.5;2.0;3.0	800	900
				4.0;4.5;5.0	900	1100
				6.0;8.0	1000	1200
			1Cr18Ni9Ti	0.25;	300	600
				0.5;1.0	500
				1.5;2.0	600	700
				3.0;4.0;4.5	800	900
				5.0;6.0;8.0
Nickel chromium copper nickel	WREK	E	1Cr18Ni9Ti	0.5;1.0	400	500
NiCr-CuNi				1.5;2.0;	500	600
				3.0;4.0;4.5;5.0	600	700
				6.0;8.0	700	800
鐵--銅鎳	WRJK	J	1Cr18Ni9Ti	0.5;1.0	300	400
Fe-CuNi	(WRFK)			1.5;2.0;	400	500
				3.0;4.0;4.5;5.0	500	600
				6.0;8.0	600	750
Copper nickel copper	WRTK	T	1Cr18Ni9Ti	0.5;1.0	200	250
Cu-CuNi	(WRCK)			1.5;2.0;3.0;4.0	250	300
				4.5;5.0
				6.0;8.0	300	350
Platinum Rhodium 10 -- platinum	WRSK	S	GH3030	2.0;	1000	1050
PtRh10-Pt	(WRPK)			3.0;4.0;4.5	1100	1200
				5.0;6.0;8.0
Platinum rhodium 13 -- platinum	WRRK	R	GH3030	2.0;	1000	1100
PtRh13-Pt	(WRQK)			3.0;4.0;4.5	1100	1200
				5.0;6.0;8.0
Platinum rhodium 30 -- platinum rhodium 6	WRBK	B	GH3030	2.0;	1000	1050
PtRh30-PtRh6	（WRRK）			3.0;4.0;4.5	1100	1200

*The model marked in brackets in the column of model number is the method used in the past.


● temperature measurement range and accuracy of commonly used armored thermocouple (class II) on site

Graduation	Temperature measurement range (℃)	Tolerance (reference end is 0 ℃)
K、N	-40～1100	±2.5℃或±0.0075∣t∣
E	-40～800
J	-40～750
T	-40～350	±1.0℃或±0.0075∣t∣

Note: "t" refers to the temperature to be measured; in the two tolerance values given in the same column, whichever is the greater.

● When the temperature of armored thermocouple changes in a step, the time required for the output value of thermocouple to change to a specified percentage of the step change is called the thermal response time, which is expressed by τ (expressed by τ 0.5 when taking 50%).


Thermal response time of armored thermocouple

Thermal response time τ 0.5 (s)

Casing diameter D (mm)	Shell type (≤)	Insulation type (≤)
2	0.4	0.5
3	0.6	1.2
4	0.8	2.5
5	1.2	4
6	2	6
8	4	8

● insulation resistance
When the ambient air temperature is 20 ± 15 ℃ and the relative humidity is not more than 80%, the insulation resistance between the thermal pole and the outer sleeve of the insulated armored thermocouple shall meet the requirements of the following table:

Diameter of armored couple D (mm)	Test voltage DCV	Insulation resistance m Ω· M
0.25	50±5	≥100
0.5～1.5	50±5	≥1000
﹥1.5	500±50	≥1000

Note: the insulation resistance is expressed in M Ω· m, that is, the normal temperature insulation resistance and armored couple
Product of length.
For example, 1000m Ω· m means that the insulation resistance of 1m long sample is
1000m Ω, insulation resistance of 10m long sample is 100m Ω.
For armour couple with length less than 1m, it is calculated as 1m.
Socket type junction box and armored thermocouple with compensation wire are not included in this example.




Basic structure of armored thermocouple
Armored thermocouple is mainly composed of junction box, terminal and armored thermocouple elements, and equipped with various installation and fixing devices.




● installation and fixation type:
The fixture is for the user to install. Armored thermocouple has five structural types: no fixed device, fixed ferrule type, movable ferrule type, fixed flange type and movable flange type. The fixed ferrule type is only for one-time fixed use, and the movable ferrule type can be used for multiple fixed uses.




Ferrule thread (unit: mm)




Size of ferrule thread joint

Diameter of protection pipe	＞４	≤４
Ｍ	Ｍ１６×１．５	Ｍ１２×１．５
Ｓ	22	19

Ferrule flange (unit: mm)


● reference end type of armored thermocouple
The junction box is used to connect the reference end of thermocouple and display instrument. There are simple type, splash proof type, waterproof type, explosion-proof type, small junction box type, plug-in type, compensation wire type and other structural types.
Schematic (partial):




Different combinations of armored thermocouples and ordering instructions
The following gives the naming methods of several combinations of different fixed installation forms and different reference ends. By referring to these combinations, as well as the previous "model meaning" and "armored thermocouple example", you can easily name the thermocouple you need.
The following figure also shows the thermocouple length L and sleeve diameter d that should be noted when ordering. When ordering and naming, the thermocouple with 1Cr18Ni9Ti stainless steel sleeve, single piece type and class II precision need not be noted separately.




● thermocouple installation method




1、 Installation method on curved pipe II, installation method of inclined pipe through axis
 


三,垂直管通軸線的安裝方法 四,鍋爐煙道中的密封安裝方法


 
 









  

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