Fixed flange type thermal resistance

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Fixed flange type thermal resistance

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Performance characteristics of temperature sensor
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Thermal resistance is used to measure temperature by the characteristic of the resistance of materials changes with the change of temperature. The heating part (temperature sensing element) of the thermal resistance uniformly double wound with fine metal on the skeleton made of insulating material. When there is a temperature gradient in the measured medium, the measured temperature is the average temperature of the medium layer in the range of the temperature sensing element.

The assembly type thermal resistance is mainly composed of the junction box,protection tube, terminal blocks, insulating tube and temperature-sensing element,it is equipped with various mounting and fixing devices.

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Type of thermal resistance	Product model	Graduation	Temperature measuring range℃	Protection tube material
Simplex platinum thermal resistance	WZP-430	PT100	-200-420	1Cr18Ni9Ti 0Cr18Ni12Mo2Ti
	WZP-431
Duplex platinum thermal resistance	WZP2-430
	WZP2-431

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The ratio between the resistance value (R100) of thermal resistance temperature-sensing element at 100℃ and the resistance R0 at 0 ℃：（R100/R0）
Graduation Pt100：	Class A R0=100±0.06Ω
	Class B R0=100±0.12Ω
	R100/R0=1.3850

Accuracy class / performance/type			Class A accuracy	Class B accuracy
Temperature measuring tolerance（℃）	Platinum resistance		±（0.15+0.2%\|t\|）	±（0.30+0.5%\|t\|）
Intrinsic error	Nominal resistance R0（Ω）	Pt10	10±0.006	10±0.012
		Pt100	100±0.06	100±0.12
	Resistance ratio（R100/R0）	Platinum resistance	1.3850±0.0010
Temperature measuring range（℃）	Platinum resistance		-200~650	-200~850
Remark：Class A accuracy does not apply to the platinum resistance with two-wire system；Class A accuracy does not apply to the Pt100 platinum resistance more than 650 ℃； Pt10 is mainly used for platinum resistance whose operating temperature extended to over 600 ℃.

Accuracy class / item /content		Platinum resistance
Limiting temperature	When the upper and lower limits are respectively 250h, the change value of resistance is measured at 0℃ or converted to the change value of temperature	A	B
Temperature cycle	After 0℃-upper limit-room temperature- lower limit - temperature-0℃temperature cycle, the measured resistance change value is converted to temperature change value	≤0.15℃	≤0.30℃
Thermoelectric effect	At 100℃, the maximum electric potential was measured by changing placed-depth	≤20μV
Self-heating effect	When the excitation current is changed from 0.03 to 10 mA at 0℃, measured resistance increment is converted to the maximum value of temperature increment or self-heating influence evaluation value（Pt10:0.1~30mA）	≤0.30℃

Type	Marker		Graduation	Material	Temperature measuring rang ℃	Performance characteristics
Type	New	Old	Graduation	Material	Temperature measuring rang ℃	Advantages	Disadvantages
Thermal resistance	K	N	K	NiCr-NiSi	-40~1200	Good linearity of thermoelectric force,good stability, good oxidation resistance,it is the most widely used temperature measuring element.	It is not applicable to reducing atmosphere,which is affected by changes of aging and the changes of short - range ordered structure
	N	M	N	NiCrSi-NiSi	-40~1250	It has all the advantages of K-type thermal resistance，the effect of short - range ordered structure change is small.	It is not applicable to reducing atmosphere,which is affected by changes of aging.
	E	E	E	NiCr - Constantan	-40~900	In the existing thermal resistance，the thermoelectric force is the highest, the sensitivity is high, and the two poles are non magnetic.	It is not applicable to reducing atmosphere, with low thermal conductivity and micro hysteresis phenomenon.
	J	F	J	Fe - Constantan	-40~750	It can be used in reducing atmosphere, and the thermoelectric force is higher than K.	Iron is easy to rust, thermoelectric characteristics drift is large.
	T	C	T	Cu- Constantan	-40~350	It can be used in reducing atmosphere, good linearity of thermoelectric force,good low temperature characteristics,good stability.	Low operating temperature,the copper of positive electrode is easy to oxidize, and the thermal conduction error is large.
	S	P	S	PtRh10-Pt	0~1600	It is applicable to oxidizing atmosphere, and can be used in vacuum for a short time. High precision, good stability, not affected by aging changes, oxidation resistance and chemical corrosion resistance , can be used as standard thermal resistance.	It is not applicable to reducing atmosphere（Especially H2, metal vapor）and vacuum environment，the price is high, the sensitivity is low, and the linearity of thermoelectric force is not good.
	B	R	B	PtRh30-PtRh6	600~1700	Applicable to more than 1000 ℃, thermoelectric force is smaller,can need not compensating lead wire, oxidation resistance, chemical corrosion resistance.	It can not be used below 600 ℃,the sensitivity is low, and the linearity of thermoelectric force is not good.

According to the transmission distance and the demand of secondary instrument , the signal output type can be determined

Fixed flange type thermal resistance

Fixed flange type thermal resistance

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