CN2319792Y - Small measuring range fluid level sensor - Google Patents
Small measuring range fluid level sensor Download PDFInfo
- Publication number
- CN2319792Y CN2319792Y CN 97243376 CN97243376U CN2319792Y CN 2319792 Y CN2319792 Y CN 2319792Y CN 97243376 CN97243376 CN 97243376 CN 97243376 U CN97243376 U CN 97243376U CN 2319792 Y CN2319792 Y CN 2319792Y
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- China
- Prior art keywords
- level sensor
- liquid level
- probe
- small amount
- sensor according
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- Expired - Fee Related
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Abstract
The utility model relates to a fluid level sensor with a small measuring range, composed of a probe, a supporting seat, a detection circuit and a connecting cable. The probe which is an inductive probe with variable capacitance is composed of two identical rectangular frame for conductors, and the extraction electrodes thereof; short sides of the frames are vertically fixed by halving, the extraction electrode which are extracted from long sides of the different frames are electrically connected with the detection circuit, and the frames and the extraction electrodes are coated by insulation layers outside. The values of output capacitance can generate linear variations due to the lifting of a liquid surface relative to the probe, and the values of output capacitance can be converted to frequency signals and output by the detection circuit. The utility model has the advantages of stable performance and low price for measuring points, being suitable for sensing and measuring a plurality of liquid levels of small measuring ranges.
Description
The utility model relates to a kind of level monitoring sensor, particularly a kind of a small amount of journey liquid level sensor.
At present, in Industry Control or engineering practicality, as a small amount of range monitorings such as liquid level gauging and control in the monitoring of building degree of tilt, the container, ultrasonic sensor commonly used, magneto strictive sensor are measured, the sonde configuration complexity, volume is big, the cost height, and each measuring point price reaches ten thousand yuan of 0.8-1.5.The engineering that has adopts micro-pressure sensor to measure, and not too suitable with micro-pressure sensor for a small amount of journey liquid level, sensitivity and precision can not meet the demands.
The purpose of this utility model is, overcomes the weak point of above-mentioned prior art, designs a kind of simple in structure, dependable performance, a small amount of journey liquid level sensor that the measuring point price is cheap.
The purpose of this utility model is achieved through the following technical solutions: the composition of journey liquid level sensor comprises probe, bearing, testing circuit and stube cable in a small amount, it is characterized in that probe is the variable capacitance inductive probe, form by two identical conductor rectangular frame and extraction electrodes thereof, the framework minor face is vertically divided equally fixing, extraction electrode is drawn by the long limit of different frames, and be electrically connected with testing circuit, framework and extraction electrode are surrounded by insulation course outward.
Two frameworks of the utility model probe and extraction electrode thereof constitute two electrodes of variable capacitance, when placing, probe measures liquid, liquid level is with respect to the lifting of probe framework, cause the change of specific inductive capacity, make its output capacitance value produce linear change, capacitance and probe framework are by the proportional routine funtcional relationship of the degree of depth of liquid level submergence (being liquid level position), and the output capacitance signal is electric circuit inspection after testing, convert frequency signal output to.The utility model is simple in structure, volume is little, the measure linear degree is good, stable performance, easy to use, measuring accuracy and sensitivity can be satisfied the actual needs of journey level gauging in a small amount, and the measuring point price is cheap, be suitable for to be used for moisture system water percentage measure of the change as multiple a small amount of journey liquid level sensors such as level change measurement and monitoring in the precise leveling of building degree of tilt, various pond, the container.
With reference to the accompanying drawings and in conjunction with the embodiments the utility model is described in detail.
Fig. 1 is the utility model journey liquid level sensor structural representation in a small amount.
Fig. 2 is the utility model journey liquid level sensor variable capacitance sonde configuration synoptic diagram in a small amount.
Fig. 3 measures the embodiment synoptic diagram for the utility model is used for the turbid liquid level sensing.
As depicted in figs. 1 and 2, the utility model composition of journey liquid level sensor in a small amount comprises probe 1, bearing 2, testing circuit 3 and stube cable 4, its probe 1 is the variable capacitance inductive probe, form by two identical conductor rectangular frames 11 and extraction electrode 12 thereof, framework 11 minor faces are vertically divided equally fixing, extraction electrode 12 is drawn by the long limit of different frames, and is electrically connected with testing circuit 3, framework 11 and the extraction electrode 12 outer insulation courses (not illustrating with label among the figure) that are surrounded by.
For the linearity that guarantees this sensor and stable specific inductive capacity, further feature is: the length-width-ratio of (1), conductor frame is greater than 5, the ratio of frame width and conductor diameter is greater than 10, make that electric charge evenly distributes on the framework conductor, set up parallel electric field, the range of linearity that changes liquid level along the long limit of framework can reach 90% of the long limit of framework; (2), the framework conductor is surrounded by double insulating layer outward, external insulation layer is hydrophobic insulation course (not illustrating with label among the figure), significantly reduces the adhesion of liquid to the probe framework, makes the probe good reproducibility, sensing capabilities is stable.Among the embodiment, the hydrophobic insulation course is selected polytetrafluoroethylmaterial material for use.
As shown in Figure 3, be used for the embodiment that the turbid liquid level sensing is measured at the utility model sensor, has a probing shell 5 of fixedlying connected with bearing 2, there is inlet 52 housing 5 belows, screen pack 51 is housed in the inlet 52, and there is pore 53 housing 5 tops, are used for balance shell inside and outside pressure, behind the bearing location, this sensor just can normally use in turbid liquid.
Claims (6)
1, a small amount of journey liquid level sensor, its composition comprises probe, bearing, testing circuit and stube cable, it is characterized in that probe is the variable capacitance inductive probe, form by two identical conductor rectangular frame and extraction electrodes thereof, the framework minor face is vertically divided equally fixing, extraction electrode is drawn by the long limit of different frames, and is electrically connected with testing circuit, and framework and extraction electrode are surrounded by insulation course outward.
2, a small amount of journey liquid level sensor according to claim 1, the length-width-ratio that it is characterized in that conductor frame be greater than 5, and the ratio of frame width and conductor diameter is greater than 10.
3, a small amount of journey liquid level sensor according to claim 1 and 2 is characterized in that the framework conductor is surrounded by double insulating layer outward, and external insulation layer is the hydrophobic insulation course.
4, a small amount of journey liquid level sensor according to claim 3 is characterized in that external insulation layer selects the teflon hydrophobic material for use.
5, a small amount of journey liquid level sensor according to claim 1 and 2 is characterized in that having a probing shell of fixedlying connected with bearing, and there is inlet the housing below, and screen pack is housed in the inlet, and there is pore the housing top.
6, a small amount of journey liquid level sensor according to claim 3 is characterized in that having a probing shell of fixedlying connected with bearing, and there is inlet the housing below, and screen pack is housed in the inlet, and there is pore the housing top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97243376 CN2319792Y (en) | 1997-12-31 | 1997-12-31 | Small measuring range fluid level sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97243376 CN2319792Y (en) | 1997-12-31 | 1997-12-31 | Small measuring range fluid level sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2319792Y true CN2319792Y (en) | 1999-05-19 |
Family
ID=33952381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97243376 Expired - Fee Related CN2319792Y (en) | 1997-12-31 | 1997-12-31 | Small measuring range fluid level sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2319792Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100420924C (en) * | 2004-05-18 | 2008-09-24 | 日本特殊陶业株式会社 | Capacitance type liquid status sensor |
-
1997
- 1997-12-31 CN CN 97243376 patent/CN2319792Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100420924C (en) * | 2004-05-18 | 2008-09-24 | 日本特殊陶业株式会社 | Capacitance type liquid status sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |