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technical article
Introducing assembled thermocouples
2012-1-30 10:15:15

Overview of assembling thermocouples

作为测量温度的变送器通常和显示仪表、记录仪表和电子调节器配套使用.它可以直接测量各种生产过程中从0℃到1800℃范围 Industrial assembled thermocouples as temperature transmitters are usually used in conjunction with display instruments, recording instruments and electronic regulators. It can directly measure from 0 ℃ to 1800 ℃ in various production processes

Surface temperatures of liquid, vapor and gaseous media and solids. Assembled thermocouples with index number of platinum rhodium 30-platinum rhodium 6, platinum rhodium 10-platinum, nickel chromium-nickel silicon, nickel chromium-constantan, etc. Assembly of thermocouples usually consists of

It consists of main components such as temperature element, installation fixture and junction box.

Thermocouple category code Graduation number Measurement range Basic error limit


Nichrome-Constantan WRK E 0-800 ℃ ± 0.75% t


Nickel chromium-nickel silicon WRN K 0-1300 ℃ ± 0.75% t


Platinum rhodium 13-platinum WRB R 0-1600 ℃ ± 0.25% t

Platinum and rhodium 10-platinum WRP S 0-1600 ℃ ± 0.25% t


Platinum Rhodium 30-Platinum Rhodium 6 WRR B 0-1800 ℃ ± 0.25% t


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

Thermocouple time constant

Thermal inertia time constant (seconds) Thermal inertia time constant (seconds)


Ⅰ 90-180 Ⅲ 10-30


Ⅱ 30-90 Ⅳ < 10


◆ Nominal pressure of thermocouple: Generally refers to the static external pressure that the protection tube can withstand at operating temperature and rupture.

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

◆ Insulation resistance: When the ambient air temperature is 15-35 ° C and the relative humidity is <80%, the insulation resistance is ≥5 Megohm (voltage 100V). Thermocouple with splash-proof junction box, when the relative temperature is 93 ± 3 ℃,

Insulation resistance ≥0.5 Megohm (voltage 100V)

◆ Insulation resistance at high temperature: The insulation resistance (per meter) of the thermocouple (including double-branch type), protection tube and double-branch hot electrode at the high temperature should be greater than the value specified in the table below.

Specified long-term use temperature (℃) Test temperature (℃) Insulation resistance value (Ω)


≥600 600 72000


≥ 800 800 25000


≥1000 1000 5000


的型号命名方法 Model Nomenclature of Assembled Thermocouple

Thermocouple without fixing device fixed thread type thermocouple movable flange type thermocouple


Fixed flange type thermocouple flexible tube joint type thermocouple fixed thread conical thermocouple


Straight pipe joint type thermocouple fixed thread joint type thermocouple movable thread pipe joint type thermocouple


Model and simple overview of assembled thermocouple

Prefabricated thermocouple is produced by Anhui Tiankang Group Co., Ltd. The prefabricated thermocouple for industrial use is usually used as a transmitter to measure temperature. It can be used with display instruments, recording instruments and electronic regulators. It can directly measure

Surface temperatures of liquids, vapors and gaseous media and solids ranging from 0 ° C to 1800 ° C in various production processes.

Available models: B, S, K, E

Detailed introduction of assembled thermocouple

Anhui Tiankang Group mainly produces primary instruments such as thermocouples and thermal resistors, and the assembled thermocouples produced adopt international IEC standards. At the same time, the series and pattern spectrum of the thermocouples uniformly designed by the Ministry of Machinery and Electronics Industry are adopted.

Overview of assembling thermocouples

Industrial assembled thermocouples as temperature transmitters are usually used together with display instruments, recording instruments and electronic regulators. It can directly measure liquids in the range of 0 ° C to 1800 ° C in various production processes,

Surface temperature of vapor and gaseous media and solids. According to national regulations, our company produces platinum-rhodium 30-platinum rhodium 6, platinum-rhodium 10-platinum, nickel-chromium-nickel-silicon, nickel-chromium-constantan, etc. in accordance with IEC international standards

And other assembled thermocouples.

通常由感温元件、安装固定装置和接线盒等主要部件组成。 Assembly thermocouples usually consist of main components such as temperature sensing elements, mounting fixtures, and junction boxes.


application

Usually used in conjunction with display instruments, recording instruments, etc. Fabricated thermal resistance directly measures the temperature of liquid, steam and gas medium and solid surface in the range of -200 ~ 500 ℃ during production.


Features


Pressure spring-type temperature sensing element, good anti-vibration performance;


High measurement accuracy;


High mechanical strength and good pressure resistance;


Imported thin film resistor elements, reliable and stable performance;


working principle


Prefabricated thermal resistance measures the temperature of a substance when its temperature changes. When the resistance value changes, the working instrument displays the temperature value corresponding to the resistance value.


The main technical parameters


Product performance standards

IEC751


JB / T8622-1997


JB / T8623-1997


Room temperature insulation resistance


Thermal resistance at ambient temperature is 15 ~ 35 ℃, relative humidity is not more than 80%, test voltage is 10 ~ 100V (DC), insulation resistance between electrode and outer tube is ≥100MΩ.


Temperature measurement range and tolerance