Thermocouple

key word：Heat exchange element

Category:

Temperature meters

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Product description

Thermocouple

1. Brief

As a kind of temperature sensor, industrial thermocouple is usually used with display instrument, recording instrument and electronic regulator. It can directly measure the surface temperature of liquid vapor, gas medium and solid from 0 ℃ to 1800 ℃.

According to the national regulations, our company's thermocouples are assembled thermocouples of PtRh30 - PtRh6, PtRh10-Pt, NiCr-NiSi, NiCr - NiCu, etc.

Thermocouples are usually composed of temperature sensing elements, mounting fixtures and junction boxes.

2. Measurement range and allowable error range

Model	Graduation	Tolerance grade
		Ⅰgrade		Ⅱ grade
		Tolerance	temperature range ℃	Tolerance	temperature range ℃
WRN	K	±1.5℃	-40~+375	±2.5℃	-40~+333
WRN	K	±0.004（t）	375~1000	±0.0075（t）	333~1200
WRM	N	±1.5℃	-40~+375	±2.5℃	-40~+333
WRM	N	±0.004（t）	375~1000	±0.0075（t）	333~1200
WRE	E	±1.5℃	-40~+375	±2.5℃	-40~+333
WRE	E	±0.004（t）	375~800	±0.004（t）	333~900
WRF	J	±1.5℃	-40~+375	±2.5℃	-40~+333
WRF	J	±0.004（t）	375~750	±0.004（t）	333~750
WRC	T	±0.5℃	-40~+125	±1℃	-40~+133
WRC	T	±0.004（t）	125~350	±0.0075（t）	133~350
WRP	S			±2.5℃	0~+600
WRP	S			±0.0025（t）	600~1300
WRQ	R			±2.5℃	0~+600
WRQ	R			±0.0025（t）	600~1300
WRR	B			±2.5℃	0~+600
WRR	B			±0.0025（t）	600~1600

Note: t is the measured temperature value of temperature sensing element (℃)

3. Thermocouple time constant

Thermal inertia level	Time constant (S)
Ⅰ	90－180
Ⅱ	30－90
Ⅲ	10-30
Ⅳ	＜10

Thermocouple nominal pressure: generally refers to the working temperature protection tube can withstand static external pressure and rupture.

Minimum insertion depth of thermocouple: no less than 8-10 times of the outer diameter of its protective sleeve (except for special products)

Insulation resistance: when the ambient air temperature is 15-35 ℃, the relative humidity is less than 80%, the insulation resistance is more than or equal to 5 megohm (voltage 100 V). Thermocouple with splash proof junction box, when the relative temperature is 93 ± Insulation resistance ≥ 0.5 megohm (voltage 100V) at 3 ℃

Insulation resistance at high temperature: at high temperature, the insulation resistance (per meter) between the thermocouple's hot electrode (including pairs type) and the protection tube and double hot electrode shall be greater than the value specified in the table below.

4. Installation and fixation

5. Model and code

Code No. 1 2 3 4 5 6 7 8

Model: WR ** - &&@@%%-$$/## - ^^

WR	Thermocouple standard type
	Code	Thermocouple type		Graduation
	N	NiCr-NiSi		K
	M	NiCrSi-NiSi		N
	E	NiCr-CuNi		E
	F	Fe-CuNi		J
	C	Cu-CuNi		T
1	P	PtRh10-Pt		S
	Q	PtRh13-Pt		R
	R	PtRh30-PtRh6		B
	W	WRe3-WRe25		WRe3/25
		Code	Thermocouple pairs
		1	Single（may be no mark）
	2	2	Double
			Code	Installation and fixation
			1	No fixture type
			2	Fixed screw type
			3	Movable flange type
		3	4	Fixed flange type
			5	Flexible tube connector type
			6	Fixed thread taper type
			7	Straight pipe joint type
			8	Fixed thread pipe joint type
			9	Movable thread pipe joint type
				Code	Type of terminal box
				2	Splash proof type
			4	3	Waterproof type
				4	Flameproof type
					Code	Protection tube OD（mm）
					0	Ф16
				5	1	Ф12（S/R/B thermocouple is Ф25 double layer tube）
					2	Ф16（high aluminum tube，limited to K、N type thermocouple）
					3	Ф25（high aluminum tube，limited to K、N type thermocouple）
						Special instructions（Ф is the OD dimensions）
					6	General length L/	mm
						7	Injection length l	mm
							Code	Explosive grade
							BT4	ExdiiBT4
						8	CT4	DiiCT4