CN103217200A - High-performance digital liquid level meter embedded with lightning protection device - Google Patents
High-performance digital liquid level meter embedded with lightning protection device Download PDFInfo
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- CN103217200A CN103217200A CN 201310084329 CN201310084329A CN103217200A CN 103217200 A CN103217200 A CN 103217200A CN 201310084329 CN201310084329 CN 201310084329 CN 201310084329 A CN201310084329 A CN 201310084329A CN 103217200 A CN103217200 A CN 103217200A
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Abstract
A high-performance digital liquid level meter embedded with a lightning protection device is a sensor which can be reliably used in hostile natural environments such as lakes and rivers. The high-performance digital liquid level meter comprises a pressure sensitive device, signal acquisition and linear fitting software, a lightening protection module, a waterproof shell, a gas guide cable and other parts. In order to solve the problem that an electronic product cannot resist lightning stroke under the naturalenvironment that the lightening protection device is inconvenient to mount, the high-performance digital liquid level meter integrates the lightening protection device and a signal acquisition and treatment circuit, the safety protection function is realized, and the service life of the high-performance digital liquid level meter under the hostile environment is effectively prolonged. Atemperature sensor in the high-performance digital liquid level meter acquires the temperature of a pressure sensitive material in real time, a relation between a voltage signal which isreflecting pressure, and the liquid level depth is corrected, and the high-accuracy liquid level depth is obtained finally through accurate calculation. The high-performance digital liquid level meter is packaged by a special stainless steel structure, can measure the water level depth and also can measureoily liquid and slightly corrosive liquid.
Description
Technical field:
The present invention is mainly used in: fields such as the rivers of physical environment very severe, reservoir.Also can be used for fields such as metallurgy, oil, chemical industry, town water, wastewater treatment.Particularly measuring accuracy requires the very poor occasion of very high environment for use.
Background technology:
The built-in lightning protection device digital level meter of high-performance can be used for testing the liquid level in rivers, lake, the well.Advantage than ultrasonic level gage is the influence that is not subjected to dense fog, than capacitive more anti-interference, can do more than floating drum and node type range.
The built-in lightning protection device digital level meter of high-performance is widely used in: industrial circles such as oil, chemical industry, metallurgy, water treatment; The early warning field of geologic hazards such as water resource monitoring and protection, earthquake, landslide and rubble flow, non-tower water supply, the people's livelihood such as domestic water reservoir ensure the field.
Because silicon piezoresistive transducer core body temperature influence significant limitation, measuring accuracy is difficult to make high precision, high-quality product; Use in the field that installation environment is very complicated, often can't avoid the damage of thunder and lightning.
Summary of the invention:
In order to overcome above-mentioned technological deficiency, the purpose of patent of the present invention is to solve will be read carefully and thoroughly liquid level sensor and can increase the service life under the frequent environment for use of thunder and lightning in the open air as far as possible.
When thunder and lightning comes temporarily, the built-in lightning protection device digital level meter of high-performance is revealed the too high surge voltage that product supply line and communication line are received rapidly with discharge tube.The electric energy of thunder and lightning is revealed to the earth by discharge tube.
The built-in lightning protection device digital level meter of high-performance arrives moment at thunder and lightning, because the voltage of power bus and communication bus is very high, components and parts on every bus cause that because moment punctures electric current moment is excessive, insure the feed circuit of cutting off the electricity supply with fast the recovery, and the circuit of sensor is protected; After the thunderbolt, fast insurance again can very fast recovery, and circuit recovers operate as normal.
The built-in lightning protection device digital level meter of high-performance, prevents because the unreasonable damage that causes product inside of operation in operation with bus protection device protection RS485 bus.
Description of drawings
Fig. 1 is a power lightning protection holding circuit schematic diagram of the present invention.
Fig. 2 is a bus lightning protection circuit schematic diagram of the present invention.
Fig. 3 is a networking mode of the present invention.
Fig. 4 is a structural drawing of the present invention.
Concrete enforcement
Non-linear power devices such as the main applying charge pipe of the present invention, schottky diode, fast recovery insurance; under improper working environment by discharge tube to ground discharge with the too high electric energy of releasing; the big electric current that produces after the schottky diode over-voltage breakdown and make principle that fast recovery insurance moment opens circuit with the protection product is prolonged the product Acceptable life to greatest extent.
Product of the present invention mainly is to utilize the pressure resistance type components and parts that pressure is detected.Product is in liquid, and the pressure that sensing element is received is converted to resistance value, is resistance value magnitude of voltage with special circuit conversion again, gathers magnitude of voltage with ADC, obtains the degree of depth of liquid level by magnitude of voltage.
This product uses the ADuc834 single-chip microcomputer as data acquisition, temperature compensation evaluation work, and this single-chip microcomputer has inner differential amplifier, directly can accept the signal of pressure-sensing device.Obtain voltage signal numerical value with inner ADC converter again.This circuit has digital temperature sensor, is used for detecting the temperature of sensitive element, obtains after temperature value and the voltage, calculates the force value of sensitive element again with specific fitting algorithm.
Because the pressure resistance type signal acquisition device is non-linear, the detected magnitude of voltage and the liquid level degree of depth are not a desirable straight line, so need carry out linearity calibration to signal by software.
Because pressure resistance type signal picker temperature influence, the linear relationship of the magnitude of voltage and the liquid level degree of depth can change along with variation of temperature, so need that the calibration relation formula to each temperature spot all has a correction in the software.
Measure the corresponding magnitude of voltage of heel pressure by the pressure core body, through processing and amplifying, through algorithm computation, obtain force value by the numerical value that obtains after the ADC collection, the final pressure value is calculated with density of liquid again, obtains the degree of depth of liquid level.
The present invention designs according to the IP68 classification of waterproof.
This present invention adopts+5～+ 24 volts of direct supplys (also accumulation pond) power supply.
Claims (6)
1. the built-in lightning protection device digital level meter of the high-performance based on silicon piezoresistance type is characterised in that: (1) built-in lightning-protection module, under abominable physical environment, can both use, and increase the service life as far as possible, reduce failure rate; (2) soon recover insurance, after being struck by lightning, be protected soon, when thunder and lightning can very fast recovery in the past, the normal use; (3) bus protection device has solved the damage of the digital circuit harmonic wave that pulse signal produces in communication process to circuit effectively.
2. based on the built-in lightning protection device digital level meter of the described high-performance of claim 1, it is characterized in that: (4) RS485 bus networking formula fluid level transmitter, use can many liquid level gauges connects together, the system that also can form a customization with other products, accomplish information networking, product adopts the communication of ASCII character, and very convenient the is connected with secondary instrument with computer, builds man-machine communication's platform of hommization.
3. based on the built-in lightning protection device digital level meter of the described a kind of high-performance of claim 1, it is characterized in that based on silicon piezoresistance type: (5) air guide cable transmission, accurately measure the gauge pressure pressure of liquid internal.
4. be characterised in that based on the built-in lightning protection device digital level meter of the described high-performance of claim 1: the compensation of (6) digital temperature, (7) high-accuracy compensation algorithm, behind temperature compensation and calibration curve, accurately.
5. be characterised in that based on the built-in lightning protection device digital level meter of the described high-performance of claim 1: the technology that multiple liquid, (10) can be realized industrialization can be measured in the structure of (8) waterproof case, (9).
6. be characterised in that based on the built-in lightning protection device digital level meter of the described high-performance of claim 1: input examination, IP68 classification of waterproof, precision ± 0.05%(contain) more than ,+5～+ 24 volts of direct supplys (also accumulation pond) power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310084329 CN103217200A (en) | 2013-03-15 | 2013-03-15 | High-performance digital liquid level meter embedded with lightning protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310084329 CN103217200A (en) | 2013-03-15 | 2013-03-15 | High-performance digital liquid level meter embedded with lightning protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103217200A true CN103217200A (en) | 2013-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201310084329 Pending CN103217200A (en) | 2013-03-15 | 2013-03-15 | High-performance digital liquid level meter embedded with lightning protection device |
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| CN (1) | CN103217200A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913829A (en) * | 2015-07-07 | 2015-09-16 | 国网上海市电力公司 | Single crystal silicon piezoresistive type online oil level detector |
| CN110897506A (en) * | 2019-12-05 | 2020-03-24 | 珠海格力电器股份有限公司 | Electric kettle water level detection method and system, storage medium and device and electric kettle |
-
2013
- 2013-03-15 CN CN 201310084329 patent/CN103217200A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913829A (en) * | 2015-07-07 | 2015-09-16 | 国网上海市电力公司 | Single crystal silicon piezoresistive type online oil level detector |
| CN110897506A (en) * | 2019-12-05 | 2020-03-24 | 珠海格力电器股份有限公司 | Electric kettle water level detection method and system, storage medium and device and electric kettle |
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Application publication date: 20130724 |