application

Usually used in conjunction with display instruments, recording instruments, electronic computers, etc. Directly measure the temperature of liquid, vapor, gas media, and solid surfaces within the range of 0-1300 ℃ in various production processes.

characteristic

·Simple assembly and easy replacement;

·Pressure spring type temperature sensing element with good anti vibration performance;

·Large measurement range;

·High mechanical strength and good pressure resistance.

Working principle

The two electrical levels of a thermocouple are composed of different conductor materials. When there is a temperature difference between the measuring end and the participating end, a thermoelectric potential is generated, and the working instrument displays the temperature value corresponding to the thermoelectric potential.

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

Structural principle

The basic structure of assembling thermocouples mainly consists of junction boxes, terminal blocks, protective tubes, insulation sleeves, and thermoelectric electrodes, and is equipped with various installation and fixing devices

Main technical numbers

Product execution standards

Temperature measurement range and allowable deviation

model	Graduation	Tolerance level
		Ⅰ		Ⅱ
		Allowable deviation	Temperature measurement range ℃	Allowable deviation	Temperature measurement range ℃
WRN	K	±1.5℃	-40~+375	±2.5℃	-40~+333
		±0.004│t│	375~1000	±0.0075│t│	333~1200
WRM	N	±1.5℃	-40~+375	±2.5℃	-40~+333
		±0.004│t│	375~1000	±0.0075│t│	333~1200
WRE	E	±1.5℃	-40~+375	±2.5℃	-40~+333
		±0.004│t│	375~800	±0.0075│t│	333~900
WRF	J	±1.5℃	-40~+375	±2.5℃	-40~+333
		±0.004│t│	375~750	±0.0075│t│	333~750
WRC	T	±1.5℃	-40~+125	±1℃	-40~+133
		±0.004│t│	125~350	±0.0075│t│	133~350

Note: t is the measured temperature of the tested thermocouple.

thermal response timeτ0.5

When there is a step change in temperature, the time required 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.

Generally refers to the static external pressure that the protective tube can withstand at working temperature without breaking. In fact, work pressure is not only related to the material, diameter, and wall thickness of the protective tube, but also to the structure, installation method, insertion depth, and flow rate and type of the medium being used for the thermocouple.

*Less depth of insertion

Thermocouples with a minimum insertion depth of 8-10 times the outer diameter of their protective tube (except for special products)

Room temperature insulation resistance

The armored thermocouple should have an insulation resistance of ≥ 100 M Ω· m between the electrode and the outer sheath at an ambient temperature of 15-35 ℃, a relative temperature not exceeding 80%, and a test voltage of 500 ± 50V (DC). For thermocouples with a length of 1 meter or less, the insulation resistance should not be less than 100 M Ω.

Upper limit temperature insulation resistance

The insulation resistance of the upper limit temperature of the thermocouple should not be less than the values specified in the following table:

Model and specifications

·Temperature sensing element

·No fixed device thermocouple

·No fixed device thermocouple

Note 1: Models 130 and 131 are waterproof with a protection level of IP55

2. Other materials for the protective tube shall be ordered according to the agreement

·No fixed device thermocouple

Note: 1. Models 120 and 121 are spray proof, with a protection level of IP65

2. Other materials for the protective tube shall be ordered according to the agreement

·Non fixed thread thermocouple

Note: Models 230 and 231 are waterproof with a protection level of IP55

2. Other materials for the protective tube shall be ordered according to the agreement

The nominal pressure is 10MPa

·Fixed thread thermocouple

Note: Models 220 and 221 are spray proof, with a protection level of IP65

2. Other materials for the protective tube shall be ordered according to the agreement

The nominal pressure is 10MPa

·Active flange thermocouple

Note: Models 320 and 321 are spray resistant with a protection level of IP65

2. Other materials for the protective tube shall be ordered according to the agreement

·Active flange thermocouple

Note: 1. Models 330 and 331 are waterproof with a protection level of IP55

2. Other materials for the protective tube shall be ordered according to the agreement

·Fixed flange thermocouple

Note: Models 420 and 421 are spray proof, with a protection level of IP65

2. Other materials for the protective tube shall be ordered according to the agreement

The nominal pressure is 2.5MPa

·Fixed flange thermocouple

Note: Models 430 and 431 are waterproof with a protection level of IP55

2. Other materials for the protective tube shall be ordered according to the agreement

The nominal pressure is 2.5MPa

·Fixed thread thermocouple

Note: 1. Models 630 and 630A are waterproof with a protection level of IP55

Models 620 and 620A are spray resistant, with a protection level of IP65

2. Other materials for the protective tube shall be ordered according to the agreement

The nominal pressure is ≤ 30MPa

·Flexible tube joint thermocouple

Note: 1. Models 52 and 52A are spray proof, with a protection level of IP65

Models 53 and 53A are waterproof with a protection level of IP55

2. Unless otherwise agreed, L is only a reference size. The insertion depth of the thermocouple should be the U-size of the hot installation sleeve

3. For details on the form of the hot installation sleeve, please refer to

·Straight tube joint thermocouple

Note: 1. Models 72 and 72A are spray proof, with a protection level of IP65

Models 73 and 73A are waterproof with a protection level of IP55

2. Unless otherwise agreed, L is only a reference size. The insertion depth of the thermocouple should be the U-size of the hot installation sleeve

3. For details on the form of the hot installation sleeve, please refer to

·Fixed threaded pipe joint thermocouple

Note: Models 82 and 82A are spray resistant with a protection level of IP65

Models 83 and 83A are waterproof with a protection level of IP55

2. Unless otherwise agreed, L is only a reference size. The insertion depth of the thermocouple should be the U-size of the hot installation sleeve

3. For details on the form of the hot installation sleeve, please refer to

·Active threaded joint thermocouple