Type K Thermocouple WRNK-491 WRNK-492 Brief Description

Type K Thermocouple WRNK-491 WRNK-492 is armoured type with Fixed adjustable thread flange,With compensating lead wire,Type K Thermocouple WRNK-491 WRNK-492 has advantages of being able to bend, high temp resistance, quick thermal response time and being sturdy and durable etc. Like industrial assembly-type thermocouple, as sensor of temp measurement, Type K Thermocouple WRNK-491 WRNK-492 is usually used with display, recorder and electronic regulator. Moreover, Type K Thermocouple WRNK-491 WRNK-492 can also be the temp sensor element of assembly-type thermocouple. Type K Thermocouple WRNK-491 WRNK-492 can measure temp of liquid, stream, gas and surface of solid range 0℃～1000℃ in all production processes. It is as per GB/T18404-2001 standard.

Type K Thermocouple WRNK-491 WRNK-492 Working principle

Type K Thermocouple WRNK-491 WRNK-492 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, Type K Thermocouple WRNK-491 WRNK-492 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. Type K Thermocouple WRNK-491 WRNK-492 structure is made of conductor, insulation magnesia and 1Cr18Ni9Ti stainless steel protection tube after many times drawing. Junction box, protective tube, insulated casing, terminals and armoured thermocouple form a basic structure of assembly-type thermocouple, with a variety of installation of fixtures.Type K Thermocouple WRNK-491 WRNK-492 has two kinds: insulation type and shell connecting type.

Type K Thermocouple WRNK-491 WRNK-492 Main technical parameter

Temperature measurement range and tolerance

Note：1）t is the absolute value of measuring temperature.

Thermal response time of Type K Thermocouple WRNK-491 WRNK-492

When the temperature appear step change, the Type K Thermocouple WRNK-491 WRNK-492 output variation is to the equivalent of 50% of the change, The time required is called the thermal response time “T0.5”

Thermal response time of Type K Thermocouple WRNK-491 WRNK-492 should not be more than requirements of the following table:

Insulation resistance of Type K Thermocouple WRNK-491 WRNK-492

When the ambient temp is 20±15℃, and relative humidity is not more than 80﹪, the insulation resistance value between insulation Type K Thermocouple WRNK-491 WRNK-492 wires and outer tube should be as per the following table.

Type K Thermocouple WRNK-491 WRNK-492 Model

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