CN204666227U - Magnetic pulse liquid level gauge - Google Patents
Magnetic pulse liquid level gauge Download PDFInfo
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- CN204666227U CN204666227U CN201520340801.2U CN201520340801U CN204666227U CN 204666227 U CN204666227 U CN 204666227U CN 201520340801 U CN201520340801 U CN 201520340801U CN 204666227 U CN204666227 U CN 204666227U
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Abstract
The utility model discloses magnetic pulse liquid level gauge, it comprises MCU Main Processing Unit, power-supply system unit, liquid crystal and button and extends out debugging unit and signal transacting and collecting unit, and MCU Main Processing Unit and power-supply system unit, liquid crystal and button extend out debugging unit and signal transacting is connected according to electric circuit type with collecting unit; Described power-supply system unit is used for power supply; Described liquid crystal and button extend out debugging unit for configuring described MCU Main Processing Unit and display echoed signal; Described signal transacting and collecting unit are for gathering echoed signal; Described MCU Main Processing Unit is used for sending pumping signal and behind Time delay measurement blind area, controls described signal transacting and collecting unit starts to gather echoed signal.The utility model real-time sampling echoed signal, and by MCU Main Processing Unit by the effective echoed signal of delays time to control identification, increase antijamming capability, and increase liquid crystal and button extends out debugging module, user scene is facilitated to check echoed signal, reduce maintenance cost, solve site problems timely and effectively.
Description
Technical field
The utility model relates to the level gauging instrument in industrial automation, particularly relates to a kind of magnetic pulse liquid level gauge.
Background technology
In industrial automation, for adapting to different Test Cycles, design different level gauges, as radar levelmeter, ultrasonic material level meter, electric float level meter, weight liquid level gauge, radio frequency admittance material switch etc., this kind equipment is widely used in the occasions such as chemical industry, oil, metallurgy, power plant, manufacture, therefore the applicability of on-the-spot type selecting instrument, the convenience of debugging maintenance is more and more subject to user and pays close attention to.
Magnetic pulse liquid level gauge adopts MCU main control unit to send initial pulse signal usually, when this initial pulse transmits in waveguide filament, create simultaneously one along waveguide filament side progressive rotating magnetic field, when the permanent-magnetic field in this magnetic field and ball float meets, produce magnetic pulse effect, waveguide filament is made to produce distortion, this distortion produce electromagnetic field by Coil Detector to and convert corresponding electric pulse to, by this pulse as echo-pulse, by calculating the mistiming between two pulses, accurately measure the liquid level of measured medium.
In the actual use procedure of magnetic pulse liquid level gauge, because in the remanent magnetism of vibration, around disturbing magnetic field, waveguide filament or electronic circuit, noise all can produce false echoed signal, when the advanced true echoed signal of this spurious signal arrives multilevel iudge threshold circuit, will echoed signal be mistaken for, thus export false liquid level information.
When return signal detects, many employings echo processing circuit modular unit provides reference voltage, when echoed signal is greater than this signal, thinks useful signal, otherwise is invalid signals.When there is undesired signal in system, if the true echoed signal of jam-to-signal arrive echo processing circuit in advance and undesired signal voltage is greater than reference voltage time, magnetic pulse will produce mistake output signal.In addition because echo signal processing adopts echoed signal and reference voltage manner of comparison, when safeguarding debugging, echo signal amplitude and interference signal amplitude can only be checked by oscillograph, thus maintenance debugging is bothered very much.
Summary of the invention
Technical problem to be solved in the utility model is: provide a kind of magnetic pulse liquid level gauge, can avoid interference signal, makes to safeguard that debugging is more simple.
The utility model solves the technical scheme that its technical matters adopts: this magnetic pulse liquid level gauge comprises MCU Main Processing Unit, power-supply system unit, liquid crystal and button and extends out debugging unit and signal transacting and collecting unit, and MCU Main Processing Unit and power-supply system unit, liquid crystal and button extend out debugging unit and signal transacting is connected according to electric circuit type with collecting unit; Described power-supply system unit is used for power supply; Described liquid crystal and button extend out debugging unit for configuring described MCU Main Processing Unit and display echoed signal; Described signal transacting and collecting unit are for gathering echoed signal; Described MCU Main Processing Unit is used for sending pumping signal and behind Time delay measurement blind area, controls described signal transacting and collecting unit starts to gather echoed signal.
Wherein, described liquid crystal and button extend out debugging unit and comprise LCDs, touch key and the I/O extended chip with I2C interface; Described LCDs is connected with MCU Main Processing Unit by the described I/O extended chip with I2C interface with touch key.
Wherein, described power-supply system unit comprises 3.3V voltage stabilizing integrated chip and the safety protection circuit with power input interface.
Wherein, described signal transacting and collecting unit comprise the signal filtering amplifying circuit and A/D sample conversion circuit that are connected successively.
Wherein, described magnetic pulse liquid level gauge also comprises the 4-20MA output unit be connected with MUC main control unit; Described 4-20MA output unit is D/A conversion chip and the V/I translation circuit of a support I2C interface, outputs to external control system for the liquid level data detected is changed into 4-20MA signal.
Wherein, described magnetic pulse liquid level gauge also comprises the button be connected with MCU Main Processing Unit and debugs and LED indicating member, and button debugging comprises two with LED indicating member and demarcates touch key and a LED state pilot lamp by 4/20MA.
Wherein, described magnetic pulse liquid level gauge also comprises the RAM expanding element be connected with MCU Main Processing Unit, and RAM expanding element is that a 128KRAM extends out chip.
Wherein, described magnetic pulse liquid level gauge also comprises the HART modular unit be connected with MCU Main Processing Unit, and described HART modular unit is HART interface chip A5191 and peripheral circuit.
Wherein, described magnetic pulse liquid level gauge also comprises the data storage cell be connected with MCU Main Processing Unit, and data storage cell is a support I2C interface eeprom chip.
Wherein, described magnetic pulse liquid level gauge also comprises the watchdog module be connected with MCU Main Processing Unit, and described watchdog module unit is a watchdog chip.
The beneficial effects of the utility model are: by real-time sampling echoed signal, and by MCU Main Processing Unit by the effective echoed signal of delays time to control identification, increase antijamming capability, and increase liquid crystal and button extends out debugging module, user scene is facilitated to check echoed signal, and change filtering mode and other configuration data in time according to echoed signal, reduce maintenance cost, solve site problems timely and effectively.
Accompanying drawing explanation
Fig. 1 is system construction drawing of the present utility model;
Fig. 2 is echo signal processing circuit block diagram of the present utility model;
Fig. 3 is echo signal sample process flow diagram of the present utility model.
Embodiment
Below in conjunction with specific embodiment, set forth the utility model further.Should be understood that these embodiments are only not used in restriction scope of the present utility model for illustration of the utility model.In addition should be understood that those skilled in the art can make various changes or modifications the utility model after having read content of the present utility model, these equivalent form of values fall within the application's appended claims limited range equally.
Magnetic pulse liquid level gauge of the present utility model comprises MCU Main Processing Unit, power-supply system unit, liquid crystal and button and extends out debugging unit and signal transacting and collecting unit, and MCU Main Processing Unit and power-supply system unit, liquid crystal and button extend out debugging unit and signal transacting is connected according to electric circuit type with collecting unit; Described power-supply system unit is used for power supply; Described liquid crystal and button extend out debugging unit for configuring described MCU Main Processing Unit and display echoed signal; Described signal transacting and collecting unit are for gathering echoed signal; Described MCU Main Processing Unit is used for sending pumping signal and behind Time delay measurement blind area, controls described signal transacting and collecting unit starts to gather echoed signal.
Below in conjunction with accompanying drawing, further illustrate the utility model.
As shown in Figure 1, magnetic pulse liquid level gauge of the present utility model comprises MCU main control unit 100, power-supply system unit 110, liquid crystal and button debugging unit 120, button debugging and LED indicating member 130, signal transacting and collecting unit 140, 4-20MA output unit 150, RAM expanding element 160, HART modular unit 170, memory module unit 180 and watchdog unit 190, described power-supply system unit 110, liquid crystal and button debugging unit 120, button debugging and LED indicating member 130, signal transacting and collecting unit 140, 4-20MA output unit 150, RAM expanding element 160, HART modular unit 170, memory module unit 180 and watchdog unit 190 are connected according to electric circuit type with described MCU main control unit 100 respectively.
In the present embodiment, MCU main control unit 100 adopts the single-chip microcomputer of super low consumption RENESAS M30 series, is modules central control unit, and the single-chip microcomputer of this super low consumption function RENESAS M30 series has delay function.
In the present embodiment, power-supply system unit 110 comprises 3.3V voltage stabilizing integrated chip and the safety protection circuit with power input interface, and wherein, safety protection circuit comprises the surge protection circuit that TVS pipe hinders with oxide film resistance; The common film interference suppression signal of film inductor formation altogether; The electrostatic discharge protective circuit that safety lattice electric capacity is formed; The reverse electrical source that prevents of three diode compositions connects anti-protection circuit.3.3V voltage stabilizing integrated chip is used for 24V being turned 9V and supplies the 9V of the circuit output of raising transmit signal power to transfer 3.3V to.
In the present embodiment, described liquid crystal and button debugging unit 120 comprise the I/O extended chip of I2C interface, COG128*64 LCDs and 4 touch keys; As extending out selective accessory, to be connected with MCU main control unit 100 by the I/O extended chip with I2C interface and to realize data and transmit, COG128*64 LCDs is for checking the amplitude of display echoed signal, undesired signal and the initial time interval transmitted, 4 touch keys are used for arranging content by configuration-system, as range, distance and correcting current, HART mailing address, company-information etc.
In the present embodiment, proportional for sampled data compression through filtering and according to liquid crystal screen parameter, is outputted to LCDs by the data that are stored in RAM expanding element 160 by MCU main control unit 100; X-axis represents the time, Y-axis representation signal amplitude, and initial point is the excitation starting point that transmits; Such user will very directly see from echo curve: transmit and mistiming of echoed signal, the amplitude of echoed signal; Judge which is undesired signal in conjunction with actual liquid level, the LCDs therefore increased is similar oscillograph function just, for showing echo curve information.
In the present embodiment, the debugging of described button comprises two with LED indicating member 130 and demarcates touch key and a LED state pilot lamp by 4/20MA; When not matching liquid crystal and button debugging unit 120,4/20MA demarcates touch key and is used for on-site proving 4/20MA configuration data, and LED state pilot lamp demarcates state for responding button; Between this unit with MCU main control unit 100, I/O directly expands and is connected and adopts scan control I/O mode.
In the present embodiment, described signal transacting and collecting unit 140 are signal transacting key components of magnetic pulse liquid level gauge.
As shown in Figure 2, described signal transacting and collecting unit comprise the signal filtering amplifying circuit and A/D sample conversion circuit that are connected successively, MCU main control unit 100 controls that transmitting amplitude is 9V, pulse width is the pumping signal of 10us, the twisting resistance produced when the pumping signal of launching runs into float changes into pulse signal through piezoelectric ceramics, through signal filtering amplifying circuit filter and amplification, convert digital signal to by A/D sample conversion circuit (as ∑-△ ADC sampling integrated chip) again, be stored in RAM and process for MCU main control unit 100.
As shown in Figure 3, after MCU main control unit 100 controls to launch pumping signal, consider to there is measurement blind area between pumping signal and echoed signal, so after the MCU main control unit time delay a bit of time (measurement blind area), CS signal wire is become low level, control signal process and collecting unit 140 work, and start with the continuous A/D sampling of 2MHZ clock frequency, and adopt dma mode to be directly stored in external RAM sampled data; Wherein, range size determines time span or sampling number, the such as range 3 meters of continuous sampling, the time span 3/340=8.82ms of so continuous sampling; After sampling terminates, CS signal wire becomes high level, closes ∑-△ ADC sampling integrated chip, makes it enter low consumption pattern, namely make control signal process and collecting unit 140 be in low consumption state.
In the present embodiment, described 4-20MA output unit 150 comprises D/A conversion chip (MAX5351) and the V/I conversion translation circuit of 13 of I2C interface, MCU main control unit 100 changes into linear current by processing the liquid level data obtained through this unit, feeds back to external control system (as long distance control system).
In the present embodiment, MCU main control unit 100 is by the D/A conversion chip linearization of accurate for the 1.2VDC in 4-20MA output unit 150 parameter voltages with 13, and the transformation resistance using 50 ohm is converted in translation circuit at V/I, when such systems axiol-ogy liquid level is zero, MCU main control unit 100 is (50*0.004/1.2) * 213=1365 to MAX5351 data, so just achieves liquid level data to 4 ~ 20MA output feedback signal.
In the present embodiment, described RAM expanding element 160 is an IS62WV1288BLL RAN chip, for the echo samples data that store M CU main control unit 100 reads from signal transacting and collecting unit 140, be convenient in express statistic process true liquid level information and be provided in the data cached of liquid crystal display display echo curve.
In the present embodiment, described HART modular unit 170 is made up of A5191 chip and interlock circuit and outside 468KHZ ceramic resonator, realize MCU main control unit 100 to be connected with operation control systems such as looking like DCS, HART hander outward and to communicate, instrument measurement data timing is uploaded outside supervisory system, also the configuration data of outside control system is accepted, thus change measurement parameter, as range, echo curve data etc.
In the present embodiment, described memory module unit 180 is a FM24LC4I2C interface eeprom chip, for saved system configuration information, even if system cut-off does not affect the data of preserving in EEPROM yet, when a system is powered up, from then on MCU main control unit 100 reads field instrument configuration data, as data such as range, distance, 4/20MA calibration point, HART addresses in chip.
In the present embodiment, described watchdog module unit 190 is a special watchdog chip, and when system time-out does not respond feeding-dog signal, watchdog chip will reset MCU main control unit 100, in case when locking system program is subject to beyond thought interference, quick restoring scene instrument mode.
The MCU main control unit of a kind of magnetic pulse liquid level gauge of the present utility model by the sampling of time delay realization to echoed signal, and adds the COG matrix liquid-crystal display screen that can show echo curve; Major advantage of the present utility model echoed signal is judged to be compared with reference voltage by simple, change into by MCU time delay sampling shielding undesired signal, the reliability of instrument is increased with this, and oscillograph can be replaced to check echo signal information with extending out liquid crystal display, enormously simplify the field adjustable time, improve Resolving probiems efficiency.
Claims (10)
1. magnetic pulse liquid level gauge, it is characterized in that: it comprises MCU Main Processing Unit, power-supply system unit, liquid crystal and button and extends out debugging unit and signal transacting and collecting unit, MCU Main Processing Unit and power-supply system unit, liquid crystal and button extend out debugging unit and signal transacting is connected according to electric circuit type with collecting unit; Described power-supply system unit is used for power supply; Described liquid crystal and button extend out debugging unit for configuring described MCU Main Processing Unit and display echoed signal; Described signal transacting and collecting unit are for gathering echoed signal; Described MCU Main Processing Unit is used for sending pumping signal and behind Time delay measurement blind area, controls described signal transacting and collecting unit starts to gather echoed signal.
2. magnetic pulse liquid level gauge according to claim 1, is characterized in that: described liquid crystal and button extend out debugging unit and comprise LCDs, touch key and the I/O extended chip with I2C interface; Described LCDs is connected with MCU Main Processing Unit by the described I/O extended chip with I2C interface with touch key.
3. magnetic pulse liquid level gauge according to claim 1, is characterized in that: described power-supply system unit comprises 3.3V voltage stabilizing integrated chip and the safety protection circuit with power input interface.
4. magnetic pulse liquid level gauge according to claim 1, is characterized in that: described signal transacting and collecting unit comprise the signal filtering amplifying circuit and A/D sample conversion circuit that are connected successively.
5. magnetic pulse liquid level gauge according to claim 1, is characterized in that: described magnetic pulse liquid level gauge also comprises the 4-20MA output unit be connected with MUC main control unit; Described 4-20MA output unit is D/A conversion chip and the V/I translation circuit of a support I2C interface, outputs to external control system for the liquid level data detected is changed into 4-20MA signal.
6. magnetic pulse liquid level gauge according to claim 1, it is characterized in that: described magnetic pulse liquid level gauge also comprises the button be connected with MCU Main Processing Unit and debugs and LED indicating member, button debugging comprises two with LED indicating member and demarcates touch key and a LED state pilot lamp by 4/20MA.
7. magnetic pulse liquid level gauge according to claim 1, is characterized in that: described magnetic pulse liquid level gauge also comprises the RAM expanding element be connected with MCU Main Processing Unit, and RAM expanding element is that a 128KRAM extends out chip.
8. magnetic pulse liquid level gauge according to claim 1, is characterized in that: described magnetic pulse liquid level gauge also comprises the HART modular unit be connected with MCU Main Processing Unit, and described HART modular unit is HART interface chip A5191 and peripheral circuit.
9. magnetic pulse liquid level gauge according to claim 1, is characterized in that: described magnetic pulse liquid level gauge also comprises the data storage cell be connected with MCU Main Processing Unit, and data storage cell is a support I2C interface eeprom chip.
10. magnetic pulse liquid level gauge according to claim 1, is characterized in that: described magnetic pulse liquid level gauge also comprises the watchdog module be connected with MCU Main Processing Unit, and described watchdog module unit is a watchdog chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520340801.2U CN204666227U (en) | 2015-05-25 | 2015-05-25 | Magnetic pulse liquid level gauge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520340801.2U CN204666227U (en) | 2015-05-25 | 2015-05-25 | Magnetic pulse liquid level gauge |
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| CN204666227U true CN204666227U (en) | 2015-09-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913833A (en) * | 2015-05-25 | 2015-09-16 | 江苏红光仪表厂有限公司 | Magnetic pulse liquidometer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913833A (en) * | 2015-05-25 | 2015-09-16 | 江苏红光仪表厂有限公司 | Magnetic pulse liquidometer |
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