Movable Adjustable Flange Armored Thermocouple WREK-501,WREK-521,WREK-531

Product Detail

WREK series armoured type thermocouple


Brief Description

WREK series armoured type thermocouple has advantages of being able to bend, high temp resistance, quick thermal response time and being sturdy and durable etc. Like industrial assembly-type thermocouple, as sensor of temp measurement, it is usually used with display, recorder and electronic regulator. Moreover, it can also be the temp sensor element of assembly-type thermocouple. It can measure temp of liquid, stream, gas and surface of solid range 0?~700? in all production processes. It is as per GB/T18404-2001 standard.




Working principle
Thermocouple working principle: two conductors with different components are welded at both ends to form a loop, measuring temperature directly side is called measurement side, terminal side is called reference side. When the temperature between measurement side and reference side has a difference, it will generate heat in the loop current, then connected to the display instrument, And the instrument indicates the corresponding temperature value of the thermal electromotive force generated by the thermocouple. Thermocouple thermoelectric EMF will grow with the measurement temperature’s growth, The size of the thermal electromotive force is related to the temperature of both ends. It has nothing to do with the length, diameter of the thermode. Armoured thermocouple structure is made of conductor, insulation magnesia and 1Cr18Ni9Ti stainless steel protection tube after many times drawing. Junction box, protective tube, insulated casing, terminals and armoured thermocouple form a basic structure of assembly-type thermocouple, with a variety of installation of fixtures.

Main technical parameter 


Temperature measurement range and tolerance

Category	Code	Graduation	Outer diameter of well mm	Temperature?	Max temp?	Allowed error ?t
						Measuring range?	Allowed error value
NiCr-CuNi	WREK	T	=F3	350	700	0~700	±2.5?/±0.75%t

Note:1)t is the absolute value of measuring temperature.

Thermal response time
When the temperature appear step change, the thermocouple output variation is to the equivalent of 50% of the change, The time required is called the thermal response time “T0.5”

Thermal response time of armoured thermocouple should not be more than requirements of the following table:




Thermal response time      T0.5S	Shell connecting type	Insulation type
Well diameter(min)
2.0	0.4	0.5
3.0	0.6	1.2
4.0	0.8	2.5
5.0	1.2	4.0
6.0	2.0	6.0
8.0	4.0	8.0


Insulation resistance
When the ambient temp is 20±15?, and relative humidity is not more than 80?, the insulation resistance value between insulation armoured thermocouple wires and outer tube should be as per the following table.

Well diameter mm	Test voltage V-D.C	Insulation resistance MO.m
0.5~1.5	50±5	=1000
>1.5	500±50	=1000

Model

W	R	Spec
		N	NiCr-NiSi
		E	NiCr-CuNi
		C	Cu-CuNi
		Material of thermometric element	K
			Armoured type	-	1	No fixed device
					2	Fixed adjustable thread joint
					3	Flexible adjustable thread joint
					4	Fixed adjustable thread flange
					5	Flexible adjustable thread flange
					Mounting fixed type	0	No junction box
						2	Splash-proof
						3	Water-proof
						8	Hand lever
						8	Little junction box
						9	With compensating lead wire
						Junction box type	1	Insulation
							2	Shell connecting
							7	Insulation(Hand lever)
							8	Shell connecting(Hand lever)
							Working end type	3	3-couples
								4	4-couples
								5	5-couples
								6	6-couples
								Multi-couples
W	R	?	K	-	?	?	?	?

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