CN107402053A - Two-wire system contact-type electronic level-sensing device - Google Patents
Two-wire system contact-type electronic level-sensing device Download PDFInfo
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- CN107402053A CN107402053A CN201710665393.1A CN201710665393A CN107402053A CN 107402053 A CN107402053 A CN 107402053A CN 201710665393 A CN201710665393 A CN 201710665393A CN 107402053 A CN107402053 A CN 107402053A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
Abstract
The invention discloses a kind of two-wire system contact-type electronic level-sensing device, two inlet wires J1, J2 are respectively connected to bridge rectifier BD1, and bridge rectifier BD1 outputs connect electrical power storage electronic module（2）, the output of electrical power storage electronic module voltage-stabilized power supply VCC1, voltage-stabilized power supply VCC1 give central controller electronic module（1）With radio-frequency generator electronic module（3）Power supply；Central controller electronic module connects radio-frequency generator electronic module, and central controller electronic module receives Sensor Electronics Module（4）Output signal, export through working mode change device（5）Electrical power storage electronic module is controlled, and the Central Control Room in a distant place is outputed signal to through two inlet wires；The output of radio-frequency generator electronic module connects isolating transformer input, and isolating transformer output voltage V2 connects Sensor Electronics Module；Sensor Electronics Module includes detection sensor, and output signal exports after Sensor Electronics Module is handled after detection sensor detection level of filler material or liquid level gives central controller electronic module.
Description
Technical field
The present invention relates to a kind of electronic stuff level instrument, more particularly to a kind of two-wire system contact-type electronic level-sensing device,.
Background technology
Level-sensing device currently used in the market is divided into two major classes, i.e. contact and contactless.Contact level-sensing device divides again
For species such as mercury formula, blocking rotary type, condenser type, magneto, Weight types；Contactless material position instrument is divided into ultrasonic wave, radar, swashed again
The species such as light.Various level-sensing devices are different according to application environment, and the difference of measured matter, it respectively has advantage and disadvantage.Mercury formula level-sensing device
During used in fine ore material in the presence of bury hammer do not alarm, the failure of disconnected hammer.Low precision be present, be not durable in blocking rotary type level-sensing device.Condenser type material
Poor reliability be present in position instrument.Disconnected hammer be present, bury hammer, disorder cable in Weight type.Magneto must be vertical when installing.And contactless material position
Instrument, if Super-sonic Level Cell is by dust, male and fomale(M＆F), noise effect.Radar material level meter is influenceed by dust, male and fomale(M＆F), normal to dielectric
Number requires.Laser material level meter is influenceed by dust, male and fomale(M＆F).
It is severe due to use environment, the factor shadow such as the shape of measured matter, temperature, dust, concentration of medium, signal interference
It is loud, so as to influence the precision and effect of detection, or even understand production development accident and influence the normal production order.Therefore, use
Unit must select suitable level-sensing device to be particularly important according to the environment and occasion used, so as to improve accuracy of detection and
Effect, it otherwise can influence to produce and increase cost.
The content of the invention
It is an object of the invention to provide a kind of two-wire system contact-type electronic level-sensing device, level-sensing device service life length, inspection
It is high to survey precision, securely and reliably, stability is good.
In order to realize above-mentioned technical purpose, the present invention adopts the following technical scheme that：
A kind of two-wire system contact-type electronic level-sensing device, including：Central controller electronic module, electrical power storage electronic module, high frequency
Generator electronic module, Sensor Electronics Module, working mode change device；
Two inlet wires J1, J2 are respectively connected to bridge rectifier BD1 1 pin and 3 pin, bridge rectifier BD1 4 pin ground connection, bridge-type
Rectifier BD1 2 pin connect electrical power storage electronic module, electrical power storage electronic module output voltage-stabilized power supply VCC1, voltage-stabilized power supply
VCC1 powers to central controller electronic module and radio-frequency generator electronic module；
The central controller electronic module connects radio-frequency generator electronic module, and central controller electronic module receives biography
Sensor electronic module output signal, the output of central controller electronic module connect control electrical power storage electricity through working mode change device
Submodule, and output signal to through two inlet wires the Central Control Room in a distant place；
The radio-frequency generator electronic module output connects isolating transformer input, and isolating transformer output voltage V2 connects sensor
Electronic module；
The Sensor Electronics Module includes detection sensor, and detection sensor detection level of filler material or liquid level, detection pass
Sensor output signal outputs signal to central controller electronic module after Sensor Electronics Module is handled.
Two inlet wires input connection Central Control Room or Central Control Room auxiliary reclay or PLC coil output line and
Ground wire, the output end of two inlet wires connect bridge rectifier BD1 1 pin and 3 pin respectively.
The electrical power storage electronic module includes triode T1, FET T4, voltage-regulator diode DV, resistance, electric capacity；It is whole
Current circuit device BD1 2 pin simultaneously meet triode T1 emitter stages, resistance R2 one end, voltage-regulator diode DV2 negative electrodes and variable resistor RW1
One end, triode T1 base stages and the connecting resistance R2 other ends and resistance R3 one end, triode T1 colelctor electrode connecting resistance R4 one end, resistance
The R4 other ends and the connecting resistance R3 other ends and voltage-regulator diode DV2 anodes；The variable resistor RW1 other ends and the 3rd pin and connecing is followed by
Resistance R1 one end, voltage-regulator diode DV1 negative electrodes and the connecting resistance R1 other ends and FET T4 source electrodes, voltage-regulator diode DV1 sun
Pole is grounded；FET T4 grids and the connecting resistance R4 other ends and electric capacity C1 one end, electric capacity C1 other ends ground connection, FET T4
Grid, which connects output end VCC1, variable resistor RW2 one end and the 3rd pin and connect, is followed by output end VCC1, the variable resistor RW2 other ends
Another termination FET T4 drain electrodes of series resistor R7, resistance R7, electric capacity C2 mono- terminate FET T4 source electrodes, another termination
Ground；Voltage-regulator diode DV3 negative electrodes concatenation light emitting diode LD2 is followed by output end VCC1, voltage-regulator diode DV3 plus earths, electricity
Hold C3 mono- and terminate output end VCC1, other end ground connection.
The central controller electronic module includes triode, voltage-regulator diode, integrated package U2A, triode T2 emitter stages
Connect triode T3 base stages, triode T2 colelctor electrodes and triode T3 colelctor electrodes and connect and be followed by voltage-regulator diode DV2 anodes, voltage stabilizing two
Pole pipe DV2 negative electrodes meet the bridge rectifier BD1 and export 2 pin, and triode T2 base stage connecting resistances R6 is followed by working mode change device
The pin of output end 2 and 4 pin, the pin of working mode change device output end 2 and 4 pin simultaneously connect, triode T3 grounded emitters；Voltage-regulator diode
DV2 negative electrodes and anode and connecting resistance R5 series connection light emitting diodes LD1；It is defeated that the pin of integrated package U2A inputs 5 connects Sensor Electronics Module
Go out signal Text, the pin of integrated package U2A inputs 3 connects the high-frequency pulse signal of radio-frequency generator electronic module, the pin of integrated package U2A 4
It is grounded, the pin of integrated package U2A output ends 1 output forward signal, the pin of integrated package U2A output ends 2 output reverse signal, integrates with 6 pin
The pin of block U2A output ends 1 and 2 pin connect the pin of working mode change device input 1 and 3 pin respectively.
The working mode change module is change-over switch JP1.
The radio-frequency generator electronic module includes phase inverter, integrated package, triode, bridge rectifier, and phase inverter U1A is defeated
Go out end and meet phase inverter U1B inputs, phase inverter U1A inputs and phase inverter U1B output end shunt-wound capacitance C5 through electric capacity C4, and
Phase inverter U1A inputs and output end and connecting resistance R9, phase inverter U1B inputs and output end and connecting resistance R10, phase inverter
U1A and U1B, resistance R9 and R10, electric capacity C4 and C5 composition radio-frequency generator, phase inverter U1B output high-frequency pulse signals；It is anti-phase
Device U1B outputs connect the pin of integrated package U2B inputs 11, and the pin of integrated package U2B inputs 9 connects the pin of output end 12, integrated package U2B output ends
12 pin export reverse signal, the pin of integrated package U2B 8 and 10 pin ground connection, the pin of integrated package U2B output ends 13 output forward signal, integrate
The pin connecting resistance R14 of block U2B output ends 13 is followed by triode T4 base stages；Triode T4 emitter stages connect power supply VCC1, triode T4 collection
Be grounded after electrode connecting resistance R15, electric capacity C12 simultaneously connects triode T4 emitter stages and earth terminal, triode T4 colelctor electrodes output connect every
From transformer TRAN inputs, the other end of isolating transformer TRAN inputs is grounded, isolating transformer TRAN output ends difference
Bridge rectifier BD2 1 pin and 3 pin is connect, bridge rectifier BD2 2 pin connect diode D2 anodes, and diode D2 negative electrodes are as electricity
Source V2, electric capacity C6 positive poles connect diode D2 negative electrodes, electric capacity C6 negative poles ground connection, bridge rectifier BD2 4 pin ground connection.
The Sensor Electronics Module includes phase inverter, photoelectrical coupler, resistance, electric capacity, detection sensor, phase inverter
U4A, phase inverter U4B, phase inverter U4C series connection are followed by photoelectrical coupler U5 inputs, another termination of photoelectrical coupler U5 inputs
The earth E, phase inverter U4A input termination detection sensor, phase inverter U4A inputs and connecting resistance R11, resistance R12, electric capacity C8,
Electric capacity C9, resistance R11 another termination power V2, resistance R12 another termination the earth E, electric capacity C8 another termination power V2, electric capacity C9
Another termination the earth E；Photoelectrical coupler U5 output ends anode connects central controller as detection sensor output line Text
Electronic module, photoelectrical coupler U5 output end anode shunt-wound capacitances C11, resistance R16, another termination electricity of resistance R13, resistance R13
Source VCC1, electric capacity C11 and resistance the R16 other end are grounded, photoelectrical coupler U5 output end negativing ending groundings.
Two-wire system contact-type electronic material position of the present invention include central controller electronic module, electrical power storage electronic module,
Radio-frequency generator electronic module, Sensor Electronics Module.Central controller electronic module control electrical power storage electronic module is carried out
Store electric energy, and be responsible for processing Sensor Electronics Module signal, if sensor detects thing position or liquid level by PLC or in
Between relay to Central Control Room or electric control chamber output alarm signal.It is steady that electrical power storage electronic module provides radio-frequency generator electronic module
Surely the voltage to work.Radio-frequency generator electronic module drives an isolating transformer job, Sensor Electronics Module is obtained just
The voltage often to work.Sensor Electronics Module is detected by detection device to thing position or liquid level, once detect thing position or
Liquid level signal is transferred to central controller electronic module immediately, and sends alarm signal by central controller electronic module.
Compared with prior art, its advantage is the present invention：
Due to present invention employs two-wire system technology, therefore the power unit in conventional electronic product is eliminated, so on the one hand
Reach energy-saving effect, on the other hand reduce the fault rate of product.The present invention can both detect solid matter and flour,
Liquid substance can be detected again.
Two-wire system contact-type electronic level-sensing device of the present invention is not by the shape of measured matter, temperature, dust, concentration of medium, letter
Number interference effect, effectively increase security, reliability, stability, accuracy of detection and the service life of contact level-sensing device.This
The level-sensing device of invention can need to be divided into two kinds of Weight type and wall-hanging when installing and using according to user.
Brief description of the drawings
Fig. 1 is two-wire system contact-type electronic level-sensing device electrical diagram of the present invention；
Fig. 2 is two-wire system contact-type electronic level-sensing device circuit theory diagrams of the present invention；
Fig. 3 is electrical power storage electronic module circuit schematic diagram；
Fig. 4 is central controller electronic module circuit schematic diagram；
Fig. 5 is radio-frequency generator electronic module circuit schematic diagram；
Fig. 6 is Sensor Electronics Module circuit theory diagrams.
In figure：1 central controller electronic module, 2 electrical power storage electronic modules, 3 radio-frequency generator electronic modules, 4 sensings
Device electronic module, 5 working mode change devices.
Embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
Referring to Fig. 1 and Fig. 2, a kind of two-wire system contact-type electronic level-sensing device, including：Central controller electronic module 1, electric energy
Stored electrons module 2, radio-frequency generator electronic module 3, Sensor Electronics Module 4, working mode change device 5.
Two inlet wires J1, J2 are respectively connected to bridge rectifier BD1 1 pin and 3 pin, and bridge rectifier BD1 4 pin are grounded,
Bridge rectifier BD1 2 pin connect electrical power storage electronic module 2, and electrical power storage electronic module 2 exports voltage-stabilized power supply VCC1, voltage stabilizing
Power supply VCC1 powers to central controller electronic module 1 and radio-frequency generator electronic module 3.
The central controller electronic module 1 connects radio-frequency generator electronic module 3, and central controller electronic module 1 connects
Receive the output signal of Sensor Electronics Module 4, central controller electronic module 1 is exported to connect through working mode change device 5 and controlled
Electrical power storage electronic module 2 processed, the increase of loop current moment or reduce that two inlet wires J1, J2 are formed are controlled, and entered through two
Line outputs signal to the Central Control Room in a distant place, auxiliary reclay is closed or is disconnected.
The output of radio-frequency generator electronic module 3 connects isolating transformer input, and isolating transformer output voltage V2 connects
Sensor Electronics Module 4.The Sensor Electronics Module 4 includes detection sensor, detection sensor detection level of filler material or liquid
Body fluid position, detection sensor output signal output signal to central controller electronic module after the processing of Sensor Electronics Module 4
1。
Two inlet wires input connection Central Control Room or Central Control Room auxiliary reclay or PLC coil output line and
Ground wire, the output end of two inlet wires connect bridge rectifier BD1 1 pin and 3 pin respectively.
The central controller electronic module 1, electrical power storage electronic module 2, radio-frequency generator electronic module 3, sensor
Electronic module 4 and the existing respective independent function of working mode change device 5, have mutually effective connection, form one completely again
Circuit diagram be arranged on a printed circuit board on.
The printed circuit board (PCB) is installed in circular metal box, is covered above with metal cover, and with four CARBURIZING FURNACE FOR STAINLESS FASTENERs
It is fixed.Sealed between can and metal cover with sealing ring, play a part of water proof and dust proof；Intermediate lateral opens a circular hole, uses
Pass through in two lines of two-wire system, and fixed with chuck fixing seal, the bottom of can by connector and flange.Flange
A hole is opened in center, is easy to lay metal bar or steel wire rope, is cased with insulation sleeve outside metal bar or steel wire rope, its length root
According to needing to adjust, metal bar or steel wire rope one end connection can internal wiring terminal, the other end connect tup.Tup is as spy
Survey the probe of sensor.
It is described in detail below for the modules of two-wire system contact-type electronic level-sensing device of the present invention.
Two-wire system refers to the auxiliary reclay that need to only utilize Central Control Room or electric control chamber（Or PLC）Coil output and ground wire connect
The input of two-wire system contact-type electronic level-sensing device is connect, i.e. two inlet wires are respectively connected to bridge rectifier BD1 1 pin and 3 pin, bridge
The pin of formula rectifier 2,4 pin connection electrical power storage electronic module 2, referring to Fig. 3, power supply is provided without being individually for it, even if in
Between relay or PLC in the case of normally opened, using the small electric leakage of coil flow through electrical power storage electronic module carry out it is uninterrupted
Energy storage can obtain the voltage for maintaining electronic stuff level instrument normal work.
Referring to Fig. 3, the electrical power storage electronic module 2 includes triode T1, FET T4, voltage-regulator diode DV, electricity
Resistance, electric capacity；Rectification circuit device BD1 2 pin simultaneously connect triode T1 emitter stages, resistance R2 one end, voltage-regulator diode DV2 negative electrodes and can
Become resistance RW1 one end, triode T1 base stages and the connecting resistance R2 other ends and resistance R3 one end, triode T1 colelctor electrode connecting resistances R4
One end, the resistance R4 other ends and the connecting resistance R3 other ends and voltage-regulator diode DV2 anodes；The variable resistor RW1 other ends and the 3rd
Pin simultaneously connects rear connecting resistance R1 one end, voltage-regulator diode DV1 negative electrodes and the connecting resistance R1 other ends and FET T4 source electrodes, voltage stabilizing two
Pole pipe DV1 plus earths；FET T4 grids and the connecting resistance R4 other ends and electric capacity C1 one end, electric capacity C1 other ends ground connection,
FET T4 grids, which connect output end VCC1, variable resistor RW2 one end and the 3rd pin and connect, is followed by output end VCC1, variable resistor
Another termination FET T4 drain electrodes of RW2 other ends series resistor R7, resistance R7, electric capacity C2 mono- terminate FET T4 source electrodes,
The other end is grounded；Voltage-regulator diode DV3 negative electrodes concatenation light emitting diode LD2 is followed by output end VCC1, voltage-regulator diode DV3 anodes
Ground connection, electric capacity C3 mono- terminate output end VCC1, other end ground connection.
The effect of the electrical power storage electronic module 2 is：1st, in the presence of the voltage difference at voltage-regulator diode DV2 both ends,
By resistance R2, R3, R4 biasing, current limliting so that triode T1 ON operations；Under voltage-regulator diode DV1 pressure stabilization function, warp
Cross variable resistor RW1, resistance R1, FET T4, variable resistor RW2, resistance R7, light emitting diode LD2, voltage-regulator diode
DV3 forms a constant current loop, then by the continuous energy storage of electrochemical capacitor C1 and C2, so as to which the voltage VCC1 for obtaining stable is supplied to
Central controller electronic module 1 and radio-frequency generator electronic module 3 are powered, and light emitting diode LD2 is power supply indicator, as long as
There is stable voltage on VCC1 ends, light emitting diode is with regard to bright.2nd, variable resistor RW1, variable resistor RW2 are regulation voltage and currents
, in the state of auxiliary reclay or PLC are normally opened, regulation variable resistor RW1, RW2 cause foregoing constant current loop electric current, add
On from bridge rectifier BD1 2 pin begin to pass through variable resistor RW1, resistance R1, voltage-regulator diode DV1 formed loop current,
The loop that two lines J1, J2 are formed merges current control in 200uA --- between 900uA, only in this way just can guarantee that it is middle after
Electrical equipment or PLC are not malfunctioned.3rd, can by adjustment in order to adapt to the use needs of the auxiliary reclay of different voltage class
Become resistance RW1, RW2, resistance R1, R7 resistance, go in direct current 24V, 48V, 110V, alternating current 220V voltage class
Between relay.4th, in this circuit diagram VCC1 be power supply just, GND bears for power supply.
Referring to Fig. 4, the central controller electronic module includes triode, voltage-regulator diode, integrated package U2A, triode
T2 emitter stages, which connect triode T3 base stages, triode T2 colelctor electrodes and triode T3 colelctor electrodes and connect, is followed by voltage-regulator diode DV2 sun
Pole, voltage-regulator diode DV2 negative electrodes meet the bridge rectifier BD1 and export 2 pin, and triode T2 base stage connecting resistances R6 is followed by Working mould
The pin of formula converter output end 2 and 4 pin, the pin of working mode change device output end 2 and 4 pin simultaneously connect, triode T3 grounded emitters；Surely
Press diode DV2 negative electrodes and anode and connecting resistance R5 series connection light emitting diodes LD1；The pin of integrated package U2A inputs 5 connects sensor electricity
The pin of submodule 4 output signal Text, integrated package U2A input 3 connects the high-frequency pulse signal of radio-frequency generator electronic module 3, collection
The blocking pin of U2A 4 and 6 pin ground connection, the pin of integrated package U2A output ends 1 output forward signal, the output of the pin of integrated package U2A output ends 2 are anti-
To signal, the pin of integrated package U2A output ends 1 and 2 pin connect the pin of 5 input of working mode change device 1 and 3 pin respectively.The Working mould
Formula modular converter 5 is change-over switch JP1.
Integrated package U2A (d type flip flops in the central controller electronic module 1）3 pin connection radio-frequency generator electronics
Integrated package U1B in module 3（Phase inverter）4 pin input high-frequency pulse signal；Integrated package U2A 5 pin are connected to sensor electricity
Photoelectrical coupler U5 output signal lines in submodule 4, once Sensor Electronics Module 4, which is sent, detects material position or liquid level signal
Central controller electronic module 1 is given, then central controller electronic module 1 passes through the working mode change device output one in circuit
Individual high level or low level cause triode T2, T3 on or off so that the loop current moment that two inlet wires J1, J2 are formed
Increase reduces, so that auxiliary reclay or PLC moments close or disconnected, the alarm purpose for having reached material position or liquid level will
Ask；The bright expression auxiliary reclay of light emitting diode LD1 lamps or PLC closures in circuit diagram, the relay among expression conversely, lamp does not work
Device or PLC disconnect.
Referring to Fig. 5, the radio-frequency generator electronic module 3 includes phase inverter, integrated package, triode, bridge rectifier, instead
Phase device U1A output ends connect phase inverter U1B inputs, phase inverter U1A inputs and phase inverter U1B output ends through electric capacity C4 and connect electricity
Hold C5, and phase inverter U1A inputs and output end and connecting resistance R9, phase inverter U1B inputs and output end and connecting resistance
R10, phase inverter U1A and U1B, resistance R9 and R10, electric capacity C4 and C5 composition radio-frequency generator, phase inverter U1B output high-frequency impulses
Signal；Phase inverter U1B outputs connect the pin of integrated package U2B inputs 11, and the pin of integrated package U2B inputs 9 connects the pin of output end 12, integrated package
The pin of U2B output ends 12 exports reverse signal, the pin of integrated package U2B 8 and 10 pin ground connection, and the output of the pin of integrated package U2B output ends 13 is positive
Signal, the pin connecting resistance R14 of integrated package U2B output ends 13 are followed by triode T4 base stages；Triode T4 emitter stages meet power supply VCC1, and three
It is grounded after pole pipe T4 colelctor electrode connecting resistances R15, electric capacity C12 simultaneously connects triode T4 emitter stages and earth terminal, triode T4 colelctor electrodes
Output connects isolating transformer TRAN inputs, and the other end of isolating transformer TRAN inputs is grounded, and isolating transformer TRAN is defeated
Go out 1 pin and 3 pin that end meets bridge rectifier BD2 respectively, bridge rectifier BD2 2 pin connect diode D2 anodes, and diode D2 is cloudy
As power supply V2, electric capacity C6 positive poles connect diode D2 negative electrodes, electric capacity C6 negative poles ground connection, bridge rectifier BD2 4 pin ground connection for pole.
By phase inverter U1A, phase inverter U1B, resistance R9, R10, electric capacity C4, C5 group in the radio-frequency generator electronic module 3
Into a radio-frequency generator, frequency is about 8Khz, and its effect has two：1st, in phase inverter U1B 4 pin pulse output ends connection
Entreat the integrated package U2A (d type flip flops in controller electronic module 1）3 pin；2nd, phase inverter U1B 4 pin pulses are exported through integrated package
U2B（D type flip flop）Two divided-frequency drives isolating transformer TRAN primary by resistance R14, R15, triode T4, electric capacity C12 again
Coil, isolating transformer TRAN secondary coil by after bridge rectifier BD2, commutation diode D2 rectifications, pass through and be electrolysed electricity
Holding the stable voltage V2 of the continuous energy storage acquisitions of C6 is supplied to Sensor Electronics Module 4 to use.
Referring to Fig. 6, the Sensor Electronics Module 4 includes phase inverter, photoelectrical coupler, resistance, electric capacity, detection sensing
Device, phase inverter U4A, phase inverter U4B, phase inverter U4C series connection are followed by photoelectrical coupler U5 inputs, photoelectrical coupler U5 inputs
Another termination the earth E, phase inverter U4A input termination detection sensor, phase inverter U4A inputs and connecting resistance R11, resistance R12,
Electric capacity C8, electric capacity C9, another termination the earth E of resistance R11 another termination power V2, resistance R12, another termination powers of electric capacity C8
Another termination the earth E of V2, electric capacity C9；During photoelectrical coupler U5 output ends anode connects as detection sensor output line Text
Controller electronic module 1 is entreated, photoelectrical coupler U5 output end anode shunt-wound capacitances C11, resistance R16, resistance R13, resistance R13 are another
One termination power VCC1, electric capacity C11 and resistance R16 other ends ground connection, photoelectrical coupler U5 output end negativing ending groundings.
The Sensor Electronics Module 4 includes detection sensor（Referred to as pop one's head in）, detectable signal process circuit, detectable signal
Phototube Coupling output circuit, detection sensor output signal is through output line Text to central controller electronic module 1.Wherein: 1、
V2 is representing power supply just in this circuit diagram；E represents that power supply is born, and is connected with the earth；Now the bottom of material buttress connects with the earth,
Charge level is as measured point, and similarly, if to measure liquid level, the canister for depositing liquid connects with the earth, the surface of liquid
As measured point.VCC1 and GND represent that another set power supply is just born with power supply in this circuit diagram, and with electrical power storage electronic die
Block 2, central controller electronic module 1, radio-frequency generator electronic module 3 share, two groups of power supplys isolating transformer TRAN and light
Electric coupler U5 isolates.Detectable signal process circuit by resistance R11, R12, electric capacity C6, C8, C9, phase inverter U4A, U4B, U4C,
Photoelectrical coupler U5 light emitting diode composition, when detection sensor does not detect material position or liquid level, phase inverter U4A 1 pin
Logic is high level " 1 ", and the 6 pin logics for causing phase inverter U4C are low level " 0 ", and photoelectrical coupler U5 light emitting diode is not
Conducting；When detection sensor detects material position or liquid level, phase inverter U4A 1 pin logic is low level " 0 ", causes phase inverter
U4C 6 pin logics are high level " 1 ", photoelectrical coupler U5 LEDs ON.2nd, synchronous adjustment resistance R11, R12
Resistance, it is possible to adjust detectable signal sensitivity, when resistance R11, R12 resistance are bigger, the photoelectricity of detectable signal sensitivity every
It is made up of from output circuit photoelectrical coupler U5 phototriode, electric capacity C11, resistance R13, R16, detection sensor is not visited
When measuring material position or liquid level, the logic of the collector output of photoelectrical coupler U5 phototriode is high level " 1 ", detection
When sensor detects material position or liquid level, the logic of the collector output of photoelectrical coupler U5 phototriode is low level
" 0 ", this is signally attached to the integrated package U2A (d type flip flops of central controller electronic module 1）5 pin inputs.
Two-wire system contact-type electronic level-sensing device of the present invention need to only utilize the auxiliary reclay of Central Control Room or electric control chamber（Or PLC）
Coil output line the input of two-wire system contact-type electronic level-sensing device is connected with ground wire, provide power supply its need not be individually for
Under the conditions of, solve following technical problem：
1st, the energy storage, control and effective detection of sensor of contact-type electronic level-sensing device are realized using two lines.
2nd, using measuring material（Or liquid）Electrical conductivity solve detection material position or the not shape by thing, dense during liquid level
Degree, temperature, dust are to influence, and improve accuracy of detection.
3rd, as a result of detection material（Or liquid）Electrical conductivity Principle Method, therefore after detecting thing position or liquid level
Time of fire alarming is very short（Note：Relative to blocking rotary type level-sensing device currently used in the market, mercury formula level-sensing device, magneto material position
For instrument etc.）.
4th, in order to adapt to the use needs of the auxiliary reclay of different voltage class, by adjust variable resistor RW1, RW2,
Resistance R1, R7 resistance, go for direct current 24V, 48V, 110V, the auxiliary reclay of alternating current 220V voltage class at present.
Two-wire system contact-type electronic level-sensing device of the present invention has reached service life length through overtesting, and accuracy of detection is high, alarm
Time is short, is not influenceed by the shape of measured matter, temperature, dust, concentration of medium etc., and cost is low, saves the technologies such as electric energy
Effect.
These are only presently preferred embodiments of the present invention, be not intended to limit the scope of the present invention, therefore, it is all
Any modification, equivalent substitution and improvements made within the spirit and principles in the present invention etc., it should be included in the protection model of the present invention
Within enclosing.
Claims (7)
1. a kind of two-wire system contact-type electronic level-sensing device, it is characterized in that：Including：Central controller electronic module（1）, electrical power storage
Electronic module（2）, radio-frequency generator electronic module（3）, Sensor Electronics Module（4）, working mode change device（5）；
Two inlet wires J1, J2 are respectively connected to bridge rectifier BD1 1 pin and 3 pin, bridge rectifier BD1 4 pin ground connection, bridge-type
Rectifier BD1 2 pin connect electrical power storage electronic module（2）, electrical power storage electronic module（2）Export voltage-stabilized power supply VCC1, voltage stabilizing
Power supply VCC1 gives central controller electronic module（1）With radio-frequency generator electronic module（3）Power supply；
The central controller electronic module（1）Connect radio-frequency generator electronic module（3）, central controller electronic module（1）
Receive Sensor Electronics Module（4）Output signal, central controller electronic module（1）Output is through working mode change device
（5）Connection control electrical power storage electronic module（2）, and output signal to through two inlet wires the Central Control Room in a distant place；
The radio-frequency generator electronic module（3）Output connects isolating transformer input, and isolating transformer output voltage V2 connects biography
Sensor electronic module（4）；
The Sensor Electronics Module（4）Including detection sensor, detection sensor detection level of filler material or liquid level, detection
Sensor output signal is through Sensor Electronics Module（4）Central controller electronic module is outputed signal to after processing（1）.
2. two-wire system contact-type electronic level-sensing device according to claim 1, it is characterized in that：The input of two inlet wires
Connection Central Control Room or the auxiliary reclay of Central Control Room or PLC coil output line and ground wire, the output end of two inlet wires connect respectively
Connect bridge rectifier BD1 1 pin and 3 pin.
3. two-wire system contact-type electronic level-sensing device according to claim 1 or 2, it is characterized in that：The electrical power storage electronics
Module（2）Including triode T1, FET T4, voltage-regulator diode DV, resistance, electric capacity；Rectification circuit device BD1 2 pin simultaneously connect
Triode T1 emitter stages, resistance R2 one end, voltage-regulator diode DV2 negative electrodes and variable resistor RW1 one end, triode T1 base stages simultaneously connect
The resistance R2 other ends and resistance R3 one end, triode T1 colelctor electrode connecting resistance R4 one end, simultaneously connecting resistance R3 is another for the resistance R4 other ends
One end and voltage-regulator diode DV2 anodes；The variable resistor RW1 other ends and the 3rd pin simultaneously connect rear connecting resistance R1 one end, the pole of voltage stabilizing two
Pipe DV1 negative electrodes and the connecting resistance R1 other ends and FET T4 source electrodes, voltage-regulator diode DV1 plus earths；FET T4 grid
Pole and the connecting resistance R4 other ends and electric capacity C1 one end, electric capacity C1 other ends ground connection, FET T4 grids meet output end VCC1, can
Become resistance RW2 one end and the 3rd pin and connect and be followed by output end VCC1, variable resistor RW2 other ends series resistor R7, resistance R7 is another
One termination FET T4 drain electrodes, electric capacity C2 mono- terminate FET T4 source electrodes, other end ground connection；Voltage-regulator diode DV3 negative electrodes
Concatenation light emitting diode LD2 is followed by output end VCC1, voltage-regulator diode DV3 plus earths, and electric capacity C3 mono- terminates output end VCC1,
The other end is grounded.
4. two-wire system contact-type electronic level-sensing device according to claim 1 or 2, it is characterized in that：The central controller electricity
Submodule（1）Including triode, voltage-regulator diode, integrated package U2A, triode T2 emitter stages connect triode T3 base stages, triode
T2 colelctor electrodes and triode T3 colelctor electrodes simultaneously connect and are followed by voltage-regulator diode DV2 anodes, and voltage-regulator diode DV2 negative electrodes connect the bridge-type
Rectifier BD1 exports 2 pin, and triode T2 base stage connecting resistances R6 is followed by working mode change device（5）The pin of output end 2 and 4 pin, work
Mode converter（5）The pin of output end 2 and 4 pin simultaneously connect, triode T3 grounded emitters；Voltage-regulator diode DV2 negative electrodes and anode are simultaneously
Connecting resistance R5 series connection light emitting diodes LD1；The pin of integrated package U2A inputs 5 connects Sensor Electronics Module（4）Output signal Text,
The pin of integrated package U2A inputs 3 connects radio-frequency generator electronic module（3）High-frequency pulse signal, the pin of integrated package U2A 4 and 6 pin connect
Ground, the pin of integrated package U2A output ends 1 output forward signal, the pin of integrated package U2A output ends 2 output reverse signal, integrated package U2A are defeated
Go out 1 pin of end and 2 pin connect working mode change device respectively（5）The pin of input 1 and 3 pin.
5. two-wire system contact-type electronic level-sensing device according to claim 4, it is characterized in that：The working mode change module
（5）For change-over switch JP1.
6. two-wire system contact-type electronic level-sensing device according to claim 1 or 2, it is characterized in that：The radio-frequency generator electricity
Submodule（3）Including phase inverter, integrated package, triode, bridge rectifier, phase inverter U1A output ends connect phase inverter through electric capacity C4
U1B inputs, phase inverter U1A inputs and phase inverter U1B output end shunt-wound capacitance C5, and phase inverter U1A inputs and defeated
Go out end and connecting resistance R9, phase inverter U1B inputs and output end and connecting resistance R10, phase inverter U1A and U1B, resistance R9 and R10,
Electric capacity C4 and C5 form radio-frequency generator, phase inverter U1B output high-frequency pulse signals；It is defeated that phase inverter U1B outputs meet integrated package U2B
Enter 11 pin of end, the pin of integrated package U2B inputs 9 connects the pin of output end 12, the pin of integrated package U2B output ends 12 output reverse signal, integrated
The pin of block U2B 8 and 10 pin ground connection, the pin of integrated package U2B output ends 13 output forward signal, the pin connecting resistance of integrated package U2B output ends 13
R14 is followed by triode T4 base stages；Triode T4 emitter stages meet power supply VCC1, are grounded after triode T4 colelctor electrode connecting resistances R15, electricity
Hold C12 and connect triode T4 emitter stages and earth terminal, the output of triode T4 colelctor electrodes connects isolating transformer TRAN inputs, isolates
The other end ground connection of transformer TRAN inputs, isolating transformer TRAN output ends connect bridge rectifier BD2 1 pin and 3 respectively
Pin, bridge rectifier BD2 2 pin connect diode D2 anodes, and diode D2 negative electrodes connect diode as power supply V2, electric capacity C6 positive poles
D2 negative electrodes, electric capacity C6 negative poles ground connection, bridge rectifier BD2 4 pin ground connection.
7. two-wire system contact-type electronic level-sensing device according to claim 1 or 2, it is characterized in that：The sensor electronic mould
Block（4）Including phase inverter, photoelectrical coupler, resistance, electric capacity, detection sensor, phase inverter U4A, phase inverter U4B, phase inverter U4C
Series connection is followed by photoelectrical coupler U5 inputs, photoelectrical coupler U5 inputs another termination the earth E, phase inverter U4A input termination
Detection sensor, phase inverter U4A inputs and connecting resistance R11, resistance R12, electric capacity C8, electric capacity C9, another termination electricity of resistance R11
Another termination the earth E of source V2, resistance R12 another termination the earth E, electric capacity C8 another termination power V2, electric capacity C9；Photoelectrical coupler
U5 output ends anode connects central controller electronic module as detection sensor output line Text（1）, photoelectrical coupler U5
Output end anode shunt-wound capacitance C11, resistance R16, resistance R13, resistance R13 another termination power VCC1, electric capacity C11 and resistance
The R16 other ends are grounded, photoelectrical coupler U5 output end negativing ending groundings.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710665393.1A CN107402053B (en) | 2017-08-07 | 2017-08-07 | Two-wire contact type electronic material level meter |
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| CN201710665393.1A CN107402053B (en) | 2017-08-07 | 2017-08-07 | Two-wire contact type electronic material level meter |
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| CN107402053B CN107402053B (en) | 2020-10-27 |
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| CN109959423A (en) * | 2017-12-14 | 2019-07-02 | Seb公司 | Detect the device of liquid level |
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| Publication number | Publication date |
|---|---|
| CN107402053B (en) | 2020-10-27 |
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