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  • Armored thermocouple cable

Armored thermocouple cable

Armored thermocouple cable, commonly known as armored wire or, internationally, as an inorganic insulation thermocouple cable, is a solid whole made of a stainless steel protective tube, magnesium oxide insulation powder, and thermocouple wire material, combined and compactedin ay mold. It has the advantages of pressure resistance, earthquake resistance, flexibility, miniaturization, and fast thermal response time. It is the core material for manufacturing armored thermocouples.

Product Advantages:
1. Sensitive thermal response and wide temperature measurement range
Small thermal inertia, fast temperature sensing speed, can cover high and low temperature ranges, stable thermoelectric potential output, and can quickly capture temperature changes in working conditions.
2. High mechanical strength, bendable and easy to install
The metal armored shell is resistant to vibration and impact, and can bend moderately, making it suitable for small equipment spaces and complex on-site wiring installations.
3. Good protective sealing and strong environmental adaptability
The mineral insulation structure is dense, moisture-proof, dustproof, and anti-oxidation, with reliable insulation performance, and can operate for a long time in harsh industrial environments such as dust and high temperatures.                                                          

Main selling points:
1. Wide temperature measurement range and fast response speed
Small thermal inertia, sensitive temperature sensing, capable of measuring both high and low temperatures, stable thermoelectric potential output, and real-time feedback of on-site temperature changes.
2. Flexible and vibration-resistant, with strong installation adaptability
The armor body is bendable, resistant to impact and vibration, and can be easily laid in small equipment spaces and complex pipeline sites.
3. Dense insulation protection, high durability
The mineral insulation structure has good sealing performance, moisture and dust resistance, oxidation resistance, and can withstand harsh industrial environments, reducing the probability of failure and extending service life.      

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FAQ Performance Specifications

Q1: What is the minimum bending radius requirement for armored thermocouple cables?
A: Generally, the bending radius should not be less than 5-7 times the outer diameter of the armor. The hot end probe should not be bent as much as possible to avoid internal wire breakage and affect temperature measurement.

Q2: Can armored thermocouples directly measure high-temperature media?
A: The upper limit of temperature measurement depends on the sheath material and thermocouple scale, and different models have different temperature resistance; Under ultra-high temperature conditions, it is necessary to verify the specifications and parameters. Exceeding the range will accelerate aging and damage.

Q3: What are the reasons for the temperature measurement signal jumping and inaccurate values?
A: Common causes include electromagnetic interference, poor wiring contact, and insulation layer damage caused by moisture. It is recommended to use a shielded type for interference environments, with single-point grounding of the shielding layer, and to check the tightness of the wiring terminals.

Q4: Can armored thermocouple cables be extended and spliced for use?
A: It is not recommended to directly connect and extend at will. Compensation wires with the same division number should be used for extension; Mixing ordinary wires will generate additional heating potential, causing significant measurement errors.

1.1 The product name, model, scale number, outer tube material, and operating temperature are shown in Table 1-1.

Product Name Model Thermocouple Type Outer Sheath Material Outer Diameter (mm) Max Operating Temp. (°C)
Armored Chromel–Nisil Thermocouple Cable
Armored Chromel–Nisil-Mg Thermocouple Cable		 KK
KN		 K
N		 GH3030, GH3039, 25Cr–20Ni 0.5; 1.0 500
1.5; 2.0 800
3.0; 4.0; 4.5; 5.0 900
6.0; 8.0 1100
Armored Chromel–Nisil Thermocouple Cable
Armored Chromel–Nisil-Mg Thermocouple Cable		 KK
KN		 K
N		 1Cr18Ni9Ti, 316L; 304 0.5; 1.0 400
1.5; 2.0 600
3.0; 4.0; 4.5; 5.0 800
6.0; 8.0 800
Armored Chromel–Constantan Thermocouple Cable KE E 1Cr18Ni9Ti, 316L; 304 0.5; 1.0 400
1.5; 2.0 500
3.0; 4.0; 4.5; 5.0 600
6.0; 8.0 800
Armored Iron–Constantan Thermocouple Cable KJ J 1Cr18Ni9Ti, 316L; 304 0.5; 1.0 300
1.5; 2.0 400
3.0; 4.0; 4.5; 5.0 500
6.0; 8.0 750
Armored Copper–Constantan Thermocouple Cable KT T 1Cr18Ni9Ti, 316L; 304 0.5; 1.0 200
1.5; 2.0; 3.0
4.0; 4.5; 5.0		 300
300
6.0; 8.0 400
Armored PtRh10–Pt Thermocouple Cable KS S GH3030, GH3039, 25Cr–20Ni 1.0; 1.5 800
2.0; 3.0 900
Armored PtRh13–Pt Thermocouple Cable KR R 4.0; 4.5 1000
5.0; 6.0; 8.0 1100
Armored PtRh30–PtRh6 Thermocouple Cable KB B GH3030, GH3039, 25Cr–20Ni 4.0; 4.5 1100
5.0; 6.0; 8.0 1200


Note: Products made of other materials and with different outer diameters can be provided upon consultation between the supplier and the customer.
1.2 Product Standards
1.2.1 Base metal-armored thermocouple cables comply with JB/T8205-1999 and GB/T18404-2001
1.2.2 Precious metal-armored thermocouple cables comply with JB/T 8909-1999
1.2.3 Armored Pt-Rh 30–Pt-Rh 8 thermocouple cables comply with QB/T 2405-2004

1.3 Method for Designating Armored Thermocouple Cable Models:

KK 4 G30 φ5.0 I GB/T18404-2001
KK Model (KKKN, KEKJKTKS, KR, KB)
4 Number of Cables: Not specified for two-core; four-core is denoted by “4”
G30 Protective Tube Material: 1Cr18Ni9Ti is denoted by “B”
GH3039 is denoted by “G39”
GH3030 is denoted by “G30”
25Cr-20Ni is denoted by “2520”
316L, 304
φ5.0 Cable Outer Diameter (Φ0.5–8.0 mm)
I Tolerance Class (Class I, II, III)
GB/T18404 Standard Number
2001 Standard Year

1.4 Product dimensionsand allowabledeviations shall comply with Table 1-2.

Outer Diameter & Tolerance (mm) KK / KN / KE / KJ / KT KS / KR / KB
Min. Wall Thickness (mm) Min. Thermocouple Wire Dia. (mm) Min. Insulation Layer Thickness (mm) Min. Wall Thickness (mm) Min. Thermocouple Wire Dia. (mm) Minimum Thermoelement Wire Diameter(mm)
0.5 ± 0.025 0.05 0.08 0.04 / / /
1.0 ± 0.025 0.1 0.15 0.08 0.1 0.1 0.12
1.5 ± 0.025 0.15 0.23 0.12 0.15 0.15 0.17
2.0 ± 0.025 0.2 0.3 0.16 0.2 0.2 0.23
3.0 ± 0.030 0.3 0.45 0.24 0.3 0.3 0.34
4.0 ± 0.040 0.4 0.6 0.32 0.4 0.4 0.47
4.5 ± 0.045 0.45 0.68 0.36 0.45 0.4 0.52
5.0 ± 0.050 0.5 0.75 0.4 0.5 0.45 0.62
6.0 ± 0.060 0.6 0.9 0.48 0.6 0.45 0.8
8.0 ± 0.080 0.8 1.2 0.64 0.8 0.45 1.16

Note: Slight adjustments to the tube wall thickness, thermocouple wire diameter, and insulation thickness are permitted for multi-core or single-core armored thermocouple cables.

1.4 Thermocouple Characteristics and Tolerances
For armored thermocouples manufactured from armored thermocouple cables of different models, when the reference junction is 0 °C, the thermoelectric potential shall comply with GB/T 16839.1-1997, “Thermocouples—Part 1: Calibration Tables,” and the tolerances for different grades shall comply with the provisions of Tables 1–3.

Category Tolerance Class Model Type Tolerance (°C) Temperature Range (°C)
Base-Metal Armored Thermocouple Cable I KK K ±1.5 °C or ±0.4 %t −40 ~ 1100
KN N −40 ~ 1100
KE E −40 ~ 800
KJ J −40 ~ 750
KT T ±0.5 °C or ±0.4 %t −40 ~ 350
II KK K ±2.5 °C or ±0.75 %t −40 ~ 1100
KN N −40 ~ 1100
KE E −40 ~ 800
KJ J −40 ~ 750
KT T ±1.0 °C or ±0.75 %t −40 ~ 400
III KK K ±2.5 °C or ±1.5 %t −200 ~ 40
KN N −200 ~ 40
KE E −200 ~ 40
KT T ±1.0 °C or ±1.5 %t −200 ~ 40
Precious-Metal Armored Thermocouple Cable II KS S ±1.5 °C or ±0.25 %t 300 ~ 1100
KR R 300 ~ 1100
pt KS S ±3.0 °C or ±0.5 %t 300 ~ 1100
KR R 300 ~ 1100
II KB B ±0.25 %t 600 ~ 1200
III KB B ±4.0 °C or ±0.5 %t 600 ~ 1200

Note: t = absolute value of the measured temperature (°C); "pt" denotes the standard (ordinary) grade.

1.5 Insulation Resistance
Insulation resistance shall be measured between pair wires and between pair wires and the outer sheath. For cables with an outer diameter <1.5 mm, the applied voltage shall be 75 + 25 V DC; for cables with an outer diameter >1.5 mm, the applied voltage shall be 500 + 50 V DC. The insulation resistance per meter at room temperature and at elevated temperatures shall comply with the provisions of Table 1-4.

Test Environment Models Min. Measuring Length (m) Test Temperature (°C) Min. Insulation Resistance (MΩ/m)
Room Temp. KK, KE, KJ, KT, KN, KS, KR, KB 1 25 ± 15 1000
High Temp. KK, KN, KE, KJ, KS, KR, KB 0.5 500 ± 15 5
High Temp. KT 0.5 300 ± 15 500

Note: The insulation materials of armored thermocouples and armored thermocouple cables have limited electrical conductivity; the insulation resistance decreases as the cable length increases. The conductivity per unit length is denoted by Sm’ (equal to Q’·m’); for cables or thermocouples longer than 1 m, the insulation resistance is expressed in ·m or MQ·m, with the insulation resistance being inversely proportional to the length; for those shorter than 1 m, it is expressed in MQ·m.

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Xinguo Group Co., Ltd.
ABOUT US Xinguo Group Co., Ltd.
Xinguo Group Co., Ltd. is a high-tech enterprise with subsidiaries including Anhui Xinguo Instrument Co., Ltd., Anhui Xinguo Alloy Co., Ltd., Anhui Xinguo Cable Co., Ltd. and Anhui Xinguo Precious Metals Co., Ltd. Founded in 1997, the Group is located in Tianchang City, Anhui Province — a National Civilized City. It has a registered capital of 118 million RMB, covers a land area of over 150 mu and a building area of 60,000 square meters. The company currently has more than 300 employees, among whom over 50 are professional and technical personnel including senior engineers, engineers and assistant engineers.
The Group is a China Custom Armored thermocouple cable Manufacturers and Armored thermocouple cable Supplier, mainly engages in the R&D, production and sales of temperature instruments, pressure instruments, level instruments, flow instruments and digital display instruments. Its product portfolio also encompasses power cables, control cables, compensation cables, computer cables, signal cables, MI heating cables, mineral insulated cables, electric heat tracing tapes, cable trays and accessories, high and low voltage distribution equipment, complete automation control systems, instrument valves, pipeline valves and fittings, glass instruments and laboratory equipment. We also supply platinum-rhodium wires, precision alloys and complete mechanical equipment, while providing supporting processing, manufacturing, sales and technical services. Additionally, we deal in professional instrument materials, alloy materials and precious metals. Our products are widely applied in power, petroleum, chemical, metallurgy, building materials, machinery, food, aerospace, new energy and other industrial sectors, as well as scientific research and education fields.
Anhui Xinguo Alloy Co., Ltd. is dedicated to manufacturing a full range of precision alloy materials and serves as a council member of the Instrument Materials Branch of China Instrument & Control Society. Its flagship products cover thermocouple alloy wires (K, N, E, J, T types), thermocouple compensation alloy wires (KX, EX, NX, JX, TX, KCA, KCB, NC, SC), high-resistance heating alloys, precision resistance alloys, heating resistance alloys, pure nickel wires, manganese-copper alloys and Monel alloys. These products are extensively used in aviation, petroleum, chemical engineering, machinery manufacturing, power and energy industries.
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