Assembly thermal resistance

WZP-230 Assembly thermal resistance produced by SHANGHAI AUTOMATION INSTRUMENTATION CO. LTD. as a temperature measurement sensor, usually display instruments, recorders and electronic regulator supporting the use of, according to the provisions of the national assembly of thermal resistance production should be in line with IEC International Standard Division Pt100 platinum thermal resistance and meet the professional standard Cu50 copper thermal resistance of the two major types of assembly, unified design of thermal resistance.

Overview

Its advantages are many, good parts decomposition, easy maintenance, easy to replace the cost of wearing parts can be low

Far away from the transmission of electrical signals, high sensitivity, stability, interchangeability and accuracy are better. Assembled platinum thermal resistance of the room temperature insulation resistance should be not less than 100MΩ, assembly of copper thermal resistance of the ambient temperature insulation resistance should be not less than 50MΩ and so on. Widely used in petroleum, chemical and other production sites associated with a variety of flammable, explosive gases, steam occasions.

WZ series of industrial thermal resistance as a temperature measurement sensor, usually with the temperature transmitter, regulator and display instruments supporting the use of such a process control system for direct measurement or control of various production processes -200 ℃ -500 ℃ range The temperature of the liquid, vapor and gaseous medium and solid surface.

Thermal resistance produced by SHANGHAI AUTOMATION INSTRUMENTATION CO. LTD. is the use of substances in the temperature changes when the resistance itself also changes with the characteristics of the temperature to measure. When a temperature gradient is present in the measured mediator, the measured temperature is the average temperature in the medium in which the temperature sensing element is located.

Although the appearance of a variety of thermal resistance vary widely, but their basic structure is roughly similar, generally have temperature components, insulation casing, protective tube, and junction box and other major components.

working principle

Thermal resistance is the use of matter in the temperature changes, the resistance also changes with the characteristics of the measured

The amount of temperature. When the resistance changes, the working instrument will show the corresponding value of the temperature value.

The assembled thermal resistance consists of a temperature sensing element, an external protective tube, a junction box and a variety of fixed fixtures. There are two sizes of single and double components. The protective tube is not only corrosion resistant but also has sufficient mechanical strength, To ensure that products can be safely used in a variety of occasions. The relationship between the thermal resistance value R (t) and its temperature t can be expressed as: R (t) = R0 (1 + At + Bt2 + ...) The temperature of the wire after heating is changed with the temperature. ...), according to the measured resistance value check the corresponding index table can be measured temperature t.

The main technical parameters

Product performance standards

IEC584

IEC1515

GB / T16839-1997

JB / T5582-91

Insulation resistance at room temperature

Thermal resistance at ambient temperature of 15-35 ° C, relative humidity of not more than 80%, test voltage of 10-100V (DC) between the electrode and the outer casing insulation resistance> 100MΩ.

System composition

(1) thermal resistance temperature measurement system generally by the thermal resistance, connecting wires and display instruments and other components. Attention should be paid to the following two points:

① thermal resistance and display instrument must be the same degree of division.

② In order to eliminate the influence of the change of the connecting wire resistance, it is necessary to adopt the three-wire connection method. See Chapter 3 of this chapter for details.

(2) armored thermal resistance armored thermal resistance by the temperature components (resistors), lead, insulation materials, stainless steel casing combination of solid body, its diameter is generally φ1 ~ φ8mm, the minimum up to φmm The Compared with the ordinary thermal resistance, it has the following advantages:

① small size, the internal air gap, thermal inertia, the measurement of small lag.

② good mechanical properties, vibration resistance, impact resistance.

③ can be bent, easy to install.

④ long service life

(3) end of the thermal resistance of the end of the thermal resistance of the temperature sensing element by the special treatment of the resistance wire around the system, close to the thermometer end. Compared with the general axial thermal resistance, it can more accurately and quickly reflect the measured end of the actual temperature, suitable for measuring the bearing pad and other parts of the end surface temperature.

(4) Flameproof thermal resistance Flameproof thermal resistance through a special structure of the junction box, the shell of the internal explosive gas mixture by the spark or arc isometric resistor circuit repair must change the length of the resistance wire and affect the resistance value, For the replacement of the new resistor as well, if the use of welding repair, after welding to be qualified before use.

Instrument selection

Model Classification degree Temperature range ℃ Temperature measurement point Protection tube material

WRN-230D K 0-1000 2-12 GH3030

0-800 1Cr18Ni9Ti

WRE-230D E 0-600 1Cr18Ni9Ti

WRN-430D K 0-1000 GH3030

0-800 1Cr18Ni9Ti

WRE-430D E 0-600 1Cr18Ni9Ti

1) Thermocouple Class I Order by agreement;

2) the rest of the protection of the material according to the agreement order;

3) External protection tube users should bring their own

Install the fixed form

Fixed thread

Temperature measurement points M D D H h SW d

2-6 M27x2 ¢ 40 ¢ 105 28 5 32 ¢ 20

7-12 M33x2 ¢ 48 ¢ 115 33 5 36 ¢ 34

Fixed flange

Temperature measurement points D D1 D2 H do d

2-6 ¢ 105 ¢ 75 - 5 32 ¢ 20

7-12 ¢ 115 ¢ 85 - 5 36 ¢ 34

Selection Notes

1) Model

2) sub-degree number

3) Accuracy class

4) thermocouple points

5) Install the fixed form

6) protection tube material

7) Length or insertion depth

Example: multi-point thermocouple, K-type, 3 points. L 1 = 1200, L 2 = 1500, L 3 = 2000, WRN-220D3I level L 1 = 1200, L 2 = 1500, L 3 = 2000, thread M27x2

Technical index sub-degree: Pt100, Cu50;

Measuring range: Pt100: -200 ~ 500 ℃;

Assembled thermal resistance

Cu50: -50 to 150 ° C;

Thermal response time: t0.5≤45s;

Tolerance: Pt100: Class A: ± (0.15 + 0.002 | t |);

Class B: ± (0.30 + 0.005 | t |);

Cu50: ± (0.40 + 0.005 | t |);

Ambient temperature: -40 ~ + 85 ℃;

Fixed flange or thread type: -0.1 ~ 2.5MPa;

Active flange or thread type: atmospheric pressure;

Electrical connection: M20 × 1.5;

Explosion-proof mark: Flameproof: ExdIICT1 ~ T6;

Intrinsically safe: ExiaIICT1 ~ T6;

Protection class: IP65;

Insertion depth: 100 ~ 5000mm;

Protection tube diameter: φ12, φ16, non-uniform specifications according to user requirements;

Protection tube material: stainless steel, etc .;

Thermal resistance insulation: resistance at room temperature Insulation resistance of the test voltage can take any 10 ~ 100V DC value, the ambient temperature should be in the range of 15 ~ 35 ℃, the relative temperature should not be greater than 80%. Insulation value at room temperature should be less than 100MΩ. Thermal Resistance Allows Current Through Platinum Resistance Measured Current Maximum No More than 5mA Assembled Thermal Resistance

Process connection: Threaded connection: M16 × 1.5, M27 × 2;

Flange connection: HG20592 ~ 20635-97DN20 above the flange, other flange standards (such as GB, JB / T, HGJ, ANSI, DIN, etc.) Junction box Material: Aluminum;

Features

Good anti - vibration performance;

High temperature accuracy;

High mechanical strength;

Good pressure resistance;

Reliable and stable performance;

Good decomposition of parts;

Easy maintenance;

Replacement of wearing parts is low cost;

Thermal response time is short. Thermal response time: The temperature change occurs at the temperature, the output of the thermal resistance changes to the time required for the 50% of the step change, and becomes the thermal response time, expressed in T0.5.

Nominal pressure: generally refers to the normal temperature, the protection tube can withstand static external pressure is not broken, the test pressure is generally used 1.5 times the nominal pressure. In fact, the nominal pressure is not only related to the material, diameter, and wall thickness of the protective tube, but also to its structure, installation method, depth of placement, and the flow rate and type of the medium being measured

use

Usually used and display, record, adjust the instrument matching, direct measurement of various production processes from -200 ~ 500℃ in the range of liquid, steam and gas mediated

Quality and solid surface temperature. Provides accurate temperature change input signals for displays, recorders, regulators, scanners, data loggers, and computers.

SHANGHAI AUTOMATION INSTRUMENTATION CO. LTD.

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