Ninomiya K-Hh – Glass Duplex Insulated K Type Thermocouple Wire With Heat-Resistant Inorganic Coating

Features

Duplex-insulated thermocouple wires insulated and sheathed with glass fiber, and coated with heat-resistant inorganic coating to improve heat-resistance and insulation properties. Maximum operating temperature under normal condition is 350℃, and short-time maximum operating temperature under overheating condition is 400℃. K-Hh is improved version of K-H (glass coated thermocouple wire) with higher heat-resistance and insulation-resistance. Color of heat-resistant inorganic coating is natural-colored white. Identification is made by spiraled stripes on the surface appeared after yarning a colored thread, which is described in the Standards Table, together with braiding glass.

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Ninomiya K-Hh thermocouple wire features duplex insulation with glass fiber, enhanced by a heat-resistant inorganic coating for improved thermal and electrical insulation properties. It operates up to 350℃ under normal conditions and can withstand up to 400℃ for short periods during overheating. K-Hh represents an advancement over K-H with superior heat and insulation resistance. The heat-resistant inorganic coating is naturally white, and identification is facilitated by spiraled stripes resulting from colored thread yarn during manufacturing, as specified in the Standards Table along with braided glass.

Heat-Resistivity Data of K-Hh

● Heat-resistance property of coating materials

Graph 1 shows heat-resistivity of our new coating materials measured by thermogravimetric analysis and compared with a conventional coating material. Pyrolysis begins at 500℃ for K-Hh and at 300℃ for K-H. The data proves that heat-resistivity of these materials are far more excellent than that of conventional one. Pyrolysis starting points were determined by tangent method using TGA chart.

 

 

Graph 1: Temperature-Weight Change Rate

 

● Heat-insulating property

Graph 2 shows changes in insulation resistance of our new coating materials under temperature changes compared with a conventional material. With the inorganic coating material, insulation resistance of K-Hh is high even under temperature at 400℃. This data is measured values for 450 mm. Source of the data is our in-house test result, but any value shown here is not guaranteed.

 

 

 

 

 

 

Graph 2: Temperature-Insulation Resistance

Specification

Standard type
Parts No. Conductor Insulation Parts OD mm Sheath
thickness mm		 Finished OD mm Conductor resistance Ω/m Color
OD mm Thickness mm OD mm Insulation Sheath
+ –
0.32 x1P  K-Hh 0.32 0.3 0.92 0.92×1.84 0.25 1.4×2.3 12.1 Natural +
Red lines		 Natural Natural +
Blue lines
0.65 x1P  K-Hh 0.65 0.4 1.45 1.45×2.9 0.25 2.0×3.4 2.95 Natural +
Red lines		 Natural Natural +
Blue lines
1.0 x1P  K-Hh 1 0.4 1.8 1.8×3.6 0.25 2.3×4.1 1.25 Natural +
Red lines		 Natural Natural +
Blue lines

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Ninomiya K-Hh – Glass Duplex Insulated K Type Thermocouple Wire With Heat-Resistant Inorganic Coating-DpstarGroup

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