Movable Flange Assembly-type Thermocouple WRE-330,WRE-331

Product Detail

WRE series assembly-type thermocouple

Brief Description

The industrial assembly-type thermocouple is used as a sensor to measure temperature, usually matched with display instruments, recording meter and electronic computer. It can directly measure temperature from 0oC to 800oC of liquid, vapor, gas medium and solid surface during various production processes. In addition, the device has the advantages of simple assembly, convenient replacement, pressure spring type temperature sensing element, good anti-vibration, wide measuring range, high mechanical strength, good pressure durability.

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.

Junction box, protective tube, insulated casing, termals and thermal electodes form a basic structure of assembly-type thermocouple, with a variety of installation of fixtures.

Main technical parameter

Temperature measurement range and tolerance

Thermocouple type	Code	Graduation	Measurement range?	tolerance?t ?
Nickel chromium	WRE	E	0~800	±2.5??±0.75%¦t¦




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”
The nominal pressure of the thermocouple
Generally speaking, it is the static outside pressure which the protection tube can withstand without being broken in the room temperature. In fact, allowing working pressure is not only related to the protection tube material, the diameter and wall thickness, it is also related to its structure, the installation method, the into depth, the measured flow rate to its structure, the installation method, the into depth, the measured flow rate and the type of media.
The test voltage of the insulation resistance in room temperature is DC 500V±50V, The atmospheric conditions of measuring at the room temperature insulation resistance is 15~35?, relative humidity is 45% and atm pressure is 86~106kPa,

For thermocouples that is longer than 1 meters, the product of the resistance value at ambient-temperature and its length should be not less than 100.
Can be expressed as: Rr. L?100MO.ML>1m
Rr here means the insulation resistance value of the thermocouple at ambient-temperature, the unit is MO.
For thermocouple of which the length is equal to/less than 1m small, its ambient temperature insulation resistance value shall not be less than 100MO.
Upper-limit temperature of the insulation resistance
The upper-limit temperature of the isulation resistance for thermocouple should not be less than the following provisons:

Upper-limit temperature?	Test temperature t?	Resistance value MO
100=tm<300	t=tm	10
300=tm<500	t=tm	2
500=tm<850	t=tm	0.5
850=tm<1000	t=tm	0.08
1000=tm<1300	t=tm	0.02
tm>1300	t=1300	0.02

Model

WR	Thermocouple			Content
		Code	Heat probe type
		R	Pt-Rh30- Pt-Rh6
		P	Pt-Rh 10-Pt
		N	Nickel chromium-nickel silicon
		M	Nickel chromium nickel silicon - silicon
		E	Nickel chromium - nickel copper
		C	Copper - Copper - Nickel
		F	Iron copper nickel
			Code	Output signal number
			None      2	single double
			Code	Fixed device form
				1 2 3 4 5 6   7	Without fixed device Fixed threaded Movable flange Fixed flange Movable flange square Fixed thread conical Straight pipe joint type
				Code	Terminal type
				2 3 4	Splash proof Waterproof type Explosion proof type
					Code	Protection tube diameter
					0	F16mm
					1	F25mm
					2	F16mm
					3	F20mm

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