Preparation method of heating type thermocouple liquid level measurement sensor

A technology of liquid level measurement and thermocouple, applied in liquid level indicators for physical variable measurement, etc., can solve the problem that armored cables cannot distinguish the gas-liquid interface, and armored cables cannot distinguish the gas-liquid interface, which restricts the development of liquid level measurement technology and other issues to achieve the effect of ensuring sensitivity and accuracy, high resolution, good accuracy and reliability

Active Publication Date: 2015-06-17
CHONGQING MATERIALS RES INST
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AI Technical Summary

Problems solved by technology

[0002] At present, the water level measurement in the pressure vessel is often measured by the armored cable sensor, which has the following disadvantages: 1. Conventional armored cables (such as armored thermocouples) cannot distinguish the gas-liquid interface; 2. Conventional armored cables Cables (such as armored heaters) also cannot resolve the gas-liquid interface and cannot be used for level measurement
The existing heating thermocouple liquid level measurement sensor adopts the products produced abroad, which has high cost and difficult maintenance, which seriously restricts the development of liquid level measurement technology in our country

Method used

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  • Preparation method of heating type thermocouple liquid level measurement sensor
  • Preparation method of heating type thermocouple liquid level measurement sensor
  • Preparation method of heating type thermocouple liquid level measurement sensor

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preparation example Construction

[0030] The preparation method of the heating type thermocouple liquid level measuring sensor is characterized in that it has the following steps, see figure 1 :

[0031] Production of heating elements:

[0032] 1) Take heating wire 7, straighten and wipe clean. Fold the heating wire in half and fix one end of the folded half on the ceramic tube 8, and clamp the other end on the bobbin, wind the heating wire on the ceramic tube at equal distances in a clockwise direction, and then merge the two ends of the heating wire on the ceramic tube. Fix one end of the tube. The heating wire is made of Cr20Ni80 material with melting point of 1400℃, density of 8.4g / mm3, elongation ≥20, resistivity of 1.09±0.05μΩ.m, thermal conductivity of 60.3 kj / mh℃ and linear expansion coefficient of 18, heating The diameter of the wire is 0.18~0.22mm; the diameter of the ceramic tube is 1.8~2.2mm, and the thickness is 0.2~0.3mm.

[0033] 2) Apply a layer of glaze powder on the outer surface of the ceramic t...

Embodiment 1

[0048] The heating type thermocouple liquid level measuring sensor is prepared by adopting the above preparation method. In order to further verify the reproducibility of the sensor, in this embodiment, a nickel lead with a low resistivity is selected as the lead wire of the heating element, and for reliable and stable resistance, Ni20Cr80 is selected as the heating wire. For accurate and reliable measurement, choose Alumel as the negative thermocouple wire, Chromel as the positive thermocouple wire, and select N7 for the nickel lead.

[0049] When working, the heating element is supplied with a DC constant current or constant voltage power supply. After its working voltage or current is stable, its potential value is measured and converted into the corresponding temperature value; then the sensor that is still heating and in a stable state Immerse into a liquid with higher thermal conductivity, observe the change of its potential value, and convert it to the corresponding temper...

Embodiment 2

[0062] The specific steps for manufacturing a heated thermocouple level measurement sensor are as follows:

[0063] Prepare the heating element:

[0064] 1) Fold the heating wire in half, and fix one end of the folded end on the ceramic tube, and double-wind the other end on the ceramic tube at an equal distance, and then gather the two ends of the heating wire on one end of the ceramic tube and fix it. The heating wire is made of Cr20Ni80 material with melting point of 1400℃, density of 8.4g / mm3, elongation ≥20, resistivity of 1.09±0.05μΩ.m, thermal conductivity of 60.3 kj / mh℃ and linear expansion coefficient of 18, heating The diameter of the wire is 0.18~0.22mm; the diameter of the ceramic tube is 1.8~2.2mm, and the thickness is 0.2~0.3mm.

[0065] 2) Coating a layer of glaze powder on the outer surface of the ceramic tube wrapped with heating wire described in step 1), sintering at a high temperature of 800°C for 10 minutes, and cooling to room temperature to obtain a heating el...

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Abstract

The invention relates to a preparation method of a heating type thermocouple liquid level measurement sensor. According to the preparation method of the heating type thermocouple liquid level measurement sensor, prepared heating elements and prepared armored cables are assembled together and fully sealed so that the heating type thermocouple liquid level measurement sensor can be obtained. The heating type thermocouple liquid level measurement sensor prepared through the method has the advantages of being capable of accurately judging a liquid-gas (vapor) interface under the conditions of high temperature and high pressure, good in reproducibility and high in resolution, capable of meeting requirements of an overload test, capable of accurately judging the liquid-gas (vapor) interface under severe environments of high temperature and high pressure, simple in process and good in uniformity of products.

Description

technical field [0001] The invention relates to a preparation method of a sensor, in particular to a preparation method of a heating type thermocouple liquid level measurement sensor. Background technique [0002] At present, the water level measurement in the pressure vessel is often measured by the armored cable sensor, which has the following disadvantages: 1. Conventional armored cables (such as armored thermocouples) cannot distinguish the gas-liquid interface; 2. Conventional armored cables Cables (such as armored heaters) also cannot resolve the gas-liquid interface and cannot be used for level measurement. The existing heating thermocouple liquid level measurement sensor adopts the products produced abroad, which has high cost and difficult maintenance, which seriously restricts the development of liquid level measurement technology in our country. Therefore, find a production process so that the obtained heating thermocouple liquid level measurement sensor can meet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F23/22
Inventor 张祖力王华唐锐鞠华罗松
Owner CHONGQING MATERIALS RES INST
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