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J-type thermocouple, J-type armored thermocouple, J-type anti-corrosion thermocouple, assembled J-type thermocouple




Product name: J-type thermocouple, J-type armored thermocouple, J-type anti-corrosion thermocouple, assembled J-type thermocouple Product No .: 10333-193
Product model: J
Updated: 2009.09.22
Produced by: Thermocouple, Thermocouple, Thermal resistance, Bimetal thermometer, PTFE, PTFE gasket--Shanghai Feilong Instrument & Electric Co., Ltd.
Product details
WR series industrial thermocouples are used as temperature measurement sensors. They are usually used in conjunction with temperature transmitters, regulators and display instruments to form a process control system to directly measure or control the temperature range of 0-1800 ° C in various production processes. Temperatures of fluids, vapors and gaseous media, and solid surfaces.
A thermocouple is a circuit composed of two ends of conductors with different components. When the two junctions have different temperatures, a thermal current is generated in the circuit. If there is a temperature difference between the working end and the reference end of the thermocouple, the display meter will indicate the temperature value corresponding to the thermoelectric potential generated by the thermocouple.
The thermoelectric heat of a thermocouple will increase as the temperature of the measuring end rises. Its size is only related to the temperature of the thermocouple material and the temperature at both ends, and has nothing to do with the length or diameter of the thermal electrode.
The shape of various thermocouples is often very different due to their needs, but their basic structure is roughly the same, usually consisting of the main parts such as a thermal electrode, an insulation sleeve protection tube, and a junction box.
Main technical characteristics Measurement range and basic error limit

Thermocouple category Code Index number Measuring range Basic error limit
Nickel chromium-constantan WRK E 0-800 ℃ ± 0.75% t
NiCr-NiSi WRN K 0-1300 ℃ ± 0.75% t
Platinum Rhodium 40-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 actual temperature of the temperature sensing element (℃)
Thermocouple time constant

Thermal inertness level Time constant (seconds) Thermal inertness level Time constant (seconds)
I 90-180 October 30
30-90 F <10
(96 bytes) Nominal pressure of thermocouple: Generally refers to the static external pressure that the protection tube can withstand at operating temperature and rupture.
(96 bytes) Minimum insertion depth of thermocouple: should be no less than 8-10 times the outer diameter of its protective sleeve (except special products)
(96 bytes) 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 ℃, the insulation resistance is ≥0.5 megohm (voltage 100V)
anniu.gif (96 bytes) Insulation resistance at high temperature: The insulation resistance (per meter) of the thermocouple (including double-branch) and the protection tube and the double-branch hot electrode at the high temperature should be greater than The values specified in the table below.

Specified long-term use temperature (℃) Test temperature (℃) Insulation resistance (Ω)
≥600 600 72000
≥ 800 800 25000
≥1000 1000 5000


Installation and use of thermocouple
The installation location of the thermocouple should be convenient for construction and maintenance. Avoid near the furnace door, or too close to the heating body and strong magnetic field, the temperature at the junction box does not exceed 100 ℃. The installation position should be as vertical as possible, but it must be installed obliquely when there is a flow rate. The outlet of the terminal box should face downward.
Thermocouples with porcelain protection tubes must be protected from rapid cooling and explosion, and should be explosion-proof. When installing, choose a place that does not prevent the heated object from moving. Porcelain jackets cannot measure liquid temperature.
The thermocouple should be wired in accordance with regulations, the lead should avoid the heat source, and the polarity of the compensation wire should not be reversed when wiring. The condition of the protective tube should be checked frequently, and measures should be taken immediately if oxidation or deformation is found. Check regularly.


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When ordering, user's note: (1) product name, (2) product model, (3) index number, (4) protection tube material and diameter, (5) length L and insertion depth, 1 (6) quantity (7) fixed thread M (8) Special technical requirements.






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