High voltage armored thermocouple

NegotiableUpdate on 12/02

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Nature of the Manufacturer: Producers

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Overview

High voltage armored thermocouples can directly measure the temperature of liquid, vapor, gas media, and solid surfaces within the range of 0-800 ℃ during the production process of various species.

Product Details

High voltage armored thermocoupleOverview of

Armored thermocouples have many advantages such as bending, high voltage resistance, fast thermal response time, and durability. Like industrial assembled thermocouples, they are commonly used as transmitters for measuring temperature and are often paired with display instruments, recording instruments, and electronic regulators. They can also be used as temperature sensing elements for assembled thermocouples. It can directly measure the temperature of liquid, vapor, gas media, and solid surfaces in the range of 0-800 ℃ during the production process of various species.

High voltage armored thermocoupleThe principle of

The working principle of armored thermocouple is that two conductors with different compositions are welded at both ends to form a circuit. The temperature measuring end is called the working end, and the wiring terminal end is called the cold end, also known as the reference end. When there is a temperature difference between the working end and the reference end, a thermal current will be generated in the circuit. When connected to a display instrument, the instrument will indicate the corresponding temperature value of the thermoelectric potential generated by the thermocouple.

The thermoelectric potential of armored thermocouples will increase as the temperature at the measuring end rises. The magnitude of the thermoelectric potential is only related to the material of the thermocouple conductor and the temperature difference at both ends, and is independent of the length and diameter of the thermoelectric electrode.

The structural principle of armored thermocouples is that they are made of a conductor, high insulation magnesium oxide, and a protective tube made of 1Cr18Ni9Ti stainless steel, which is pulled together multiple times. Armored thermocouple products are mainly composed of junction boxes, terminal blocks, and armored thermal resistors, and are equipped with various installation and fixing devices. There are two types: insulated and shell connected.

Basic technical specifications of armored thermocouples

Category (code)	graduation mark	Outer diameter of casing (d)	Common temperature (℃)	Maximum operating temperature (℃)	Allowable deviation △ t
					Temperature measurement range (℃)	tolerance value
Nickel chromium constantan WREK	E	≥φ 3	600	700	0~700	± 2.5 ℃ or ± 0.75% t
Nickel chromium nickel silicon WRNK	K	≥φ 3	800	950	0~900	± 2.5 ℃ or ± 0.75% t
Copper - Copper Copper WRCK	T	≥φ 3	350	400	<-200	Not specified
					-40～350	± 1 ℃ or ± 0.75% t

Note: 1. t is the value of the measured temperature
2. T-type indexing products need to be ordered in consultation with the manufacturer

Thermal response time

When there is a step change in temperature, the time taken for the output of the thermocouple to change to 50% of the step change is called the thermal response time, represented by τ 0.5.

insulation resistance

When the ambient air temperature is 20 ± 1.5 ℃ and the relative humidity is not greater than 80%, the insulation resistance value between the thermocouple wire and the outer sleeve of the insulated armored thermocouple should comply with the provisions in the table below.

Wire diameter (mm)	Test voltage (V-DC)	Insulation resistance (M Ω. m)
1.5	50±10%	≥ 1000
>1.5	500±10%	≥ 1000

Flexible

The radius of flexible curvature shall not be less than 5 times its outer diameter.

Thermal response time

Thermal response time τ 0.5 seconds, casing diameter (mm)	Shell type	Insulated type
3.0	0.6	1.2
4.0	0.8	2.5
5.0	1.2	4.0
6.0	2.0	6.0
8.0	4.0	8.0

Standard specifications for outer diameter and nominal length

Outer diameter d (mm)
φ 8	φ 6	φ 5	φ 4	φ 3
50	50	50	50	50
75	75	75	75	75
100	100	100	100	100
150	150	150	150	150
200	200	200	200	200
250	250	250	250	250
300	300	300	300	300
400	400	400	400	400
500	500	500	500	500
750	750	750	750	750
1000	1000	1000	1000	1000
	1250	1250	1250	1250
	1500	1500	1500	1500
	2000	2000	2000	2000
		2500	2500	2500
		3000	3000	3000
		4000	4000	4000
			5000	5000
			7500	7500
			10000	10000
				15000

Note: The nominal total length L of the ￠ 3 insulated armored thermocouple shall not exceed 10000mm.
2. For products with an outer diameter of d ≤ ￠ 5mm and equipped with splash proof or waterproof junction boxes, users should pay attention during installation that the exposed part of the thermocouple must be supported by brackets or other auxiliary supports to increase rigidity, ensure firmness, and prevent the junction box from shaking back and forth and damaging the thermocouple.

Structure of Armored Thermocouples

The structural form of the material

Structural form of working end (hot end)

Installation type

Fixed devices are designed for users to install. In addition to products without fixed devices, there are four structural forms of fixed devices: fixed sleeve type, movable sleeve type, fixed flange, and movable flange. The fixed card sleeve type is designed for users to fix in place, while the movable card sleeve type allows users to fix it multiple times.

Outer diameter d Diameter of casing (mm)	φ 8	φ 6	φ 5	φ 4	φ 4	φ 3	φ 2
M	M16＊1.5				M12＊1.5
S	22				19

Note: The numbers in parentheses are generally not used for this specification, and special specifications are required for ordering.

Free end (junction box) form

The junction box is used to connect the free end of thermocouples and display instruments. Currently, there are various structural forms including simple, splash proof, waterproof, handle type, small junction box, and compensating conductor type.

Compensation wire type, splash proof type, waterproof type, handle type, small junction box type