Thermocouple WRE-630 WRE-631 WRE-632 WRE-633

 

Thermocouple WRE-630 WRE-631 WRE-632 WRE-633 Brief Description

Thermocouple WRE-630 WRE-631 WRE-632 WRE-633 industrial assembly-type thermocouple with fixed thread conical connection,waterproof type,which is used as a sensor to measure temperature, Thermocouple WRE-630 WRE-631 WRE-632 WRE-633 usually matched with display instruments, recording meter and electronic computer.Thermocouple WRE-630 WRE-631 WRE-632 WRE-633 can directly measure temperature from 0℃ to 800℃ of liquid, vapor, gas medium and solid surface during various production processes. In addition, Thermocouple WRE-630 WRE-631 WRE-632 WRE-633 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.

 

Thermocouple WRE-630 WRE-631 WRE-632 WRE-633 Working principle

Thermocouple WRE-630 WRE-631 WRE-632 WRE-633 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 WRE-630 WRE-631 WRE-632 WRE-633 thermocouple, with a variety of installation of fixtures.

 

Thermocouple WRE-630 WRE-631 WRE-632 WRE-633 Main technical parameter

Temperature measurement range and tolerance

Thermocouple type	Code	Graduation	Measurement range℃	tolerance△t　℃
Nickel - chromium	WRE	E	Max Temp:0～800 Working Temp:0～600	±2.5℃/±0.75%│t│

 

Thermocouple WRE-630 WRE-631 WRE-632 WRE-633 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 “T”.

 

The nominal pressure of Thermocouple WRE-630 WRE-631 WRE-632 WRE-633

Generally speaking, Thermocouple WRE-630 WRE-631 WRE-632 WRE-633 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,

 

a. 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≧100MΩ.ML＞1m

Rr here means the insulation resistance value of the thermocouple at ambient-temperature, the unit is MΩ.

b. For thermocouple of which the length is equal to/less than 1m small, its ambient temperature insulation resistance value shall not be less than 100MΩ.

 

Upper-limit temperature of the insulation resistance

The upper-limit temperature of the insulation resistance for Thermocouple WRE-630 WRE-631 WRE-632 WRE-633 should not be less than the following provisions:

Upper-limit temperature℃	Test temperature t℃	Resistance value MΩ
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

 

Thermocouple WRE-630 WRE-631 WRE-632 WRE-633 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	Φ16mm
					1	Φ25mm
					2	Φ16mm
					3	Φ20mm

 

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