CN207571072U - A kind of alkali concn tester - Google Patents
A kind of alkali concn tester Download PDFInfo
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- CN207571072U CN207571072U CN201721556272.5U CN201721556272U CN207571072U CN 207571072 U CN207571072 U CN 207571072U CN 201721556272 U CN201721556272 U CN 201721556272U CN 207571072 U CN207571072 U CN 207571072U
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Abstract
The utility model discloses a kind of alkali concn tester, including probe and measuring circuit.The probe includes magnet exciting coil and detection coil, and magnet exciting coil and detection coil, which coaxially stack to be fixed together after being packaged using resistant material, immerses solution to be measured.The measuring circuit is placed in outside solution to be measured, including oscillation and exciting unit, amplification and output unit.Measuring circuit sends out pumping signal to magnet exciting coil, and corresponding voltage is generated in detection coil, and measuring circuit again measures detection coil voltage value, and the alkali concn numerical value of solution to be measured is obtained according to detection coil voltage value.The probe is encapsulated in resistant material, is not in direct contact the measure that can be realized to various corrosive solution alkali concns with solution to be measured, avoids corrosion and pollution of the corrosive solution to probe, the reliability and service life of tester greatly improved.Meanwhile the alkali concn tester also has the advantages that high certainty of measurement, stability are good.
Description
Technical field
The utility model is related to detection device technical field more particularly to a kind of alkali concn testers.
Background technology
In soda ash preparation process, alkali concn is one of important parameter for needing to be monitored at any time, in multiple working procedure all
It needs to carry out on-line checking to it in real time.Currently used alkali concn assay method has refraction process, conductance method and hydrometer method.Its
In, the measurement accuracy and reproducibility of hydrometer method are relatively low, few to apply.Although refraction process overall performance is relatively good, refraction process
The optical principle of foundation requires its measurement head to be made of light source, prism, photocell etc., the later stage installation, safeguard it is cumbersome.Conductance
Method is using the correspondence indirect determination liquid alkali concn between electrical conductivity of solution and its concentration, and measuring device is simple, is measured
Precision is higher, therefore as current most important measurement method.But the alkali concn tester of currently employed conductance method is all with electricity
Extremely directly and detected solution contacts to measure its conductivity, it is the shortcomings that this mode：First, to ensure measuring accuracy, selected electricity
Pole is usually platinum electrode, and production cost is high.2nd, electrode is in direct contact detected solution and is easily contaminated and polarizes, and influences to measure essence
Degree and service life.The usual corrosivity of solution to be measured is extremely strong especially in soda ash preparation process, even more substantially reduces alkali concn
The service life of tester.
Utility model content
The purpose of this utility model is to provide a kind of alkali concn testers, and based on electromagnetic induction principle, sensing element is not
The measure that can be realized to various corrosive solution alkali concns is in direct contact with solution to be measured, high certainty of measurement, stability are good,
It is durable.
In order to solve the above technical problems, the utility model uses following technical scheme：
A kind of alkali concn tester, including probe and measuring circuit, the probe and measuring circuit electrical connection,
The probe includes two toroidal inductors of magnet exciting coil and detection coil, and magnet exciting coil and detection coil are adopted
It coaxially stacks after being packaged with resistant material and is immersed in solution to be measured after being fixed together；
The measuring circuit is placed in outside solution to be measured, including oscillation with exciting unit, amplification and output unit,
The oscillation includes power supply, the first capacitance, the second capacitance, third capacitance, the 4th capacitance, the 5th electricity with exciting unit
Appearance, the 6th capacitance, the 7th capacitance, the 8th capacitance, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance,
Six resistance, the 7th resistance, the 8th resistance, the first adjustable resistance, the first triode, third zener diode and the first power amplification
Device, the 6th capacitance is in parallel with third zener diode, the plus earth of third zener diode, third zener diode
Cathode all the way through the 7th resistance connect power input, another way through first resistor connect the first triode collector, first
It is defeated that the collector of triode after the 5th resistance, the 7th capacitance, the first adjustable resistance connects the first power amplifier successively all the way
Enter anode, another way connects the base stage of the first triode, the 5th capacitance after the 8th resistance, second resistance, 3rd resistor successively
The emitter of the first triode, other end ground connection, first capacitance one end connection the one or three are connect with one end after the 6th resistor coupled in parallel
The collector of pole pipe, other end ground connection, second capacitance one end connect the 8th resistance and second resistance common end, and the other end is grounded,
4th capacitance one end connects second resistance and 3rd resistor common end, and other end ground connection, power output end is through third capacitance connection
Power ground end, power ground end ground connection, power amplifier input positive terminal connection power input, input negative terminal ground connection, output
End is successively through the 8th capacitance and the 4th resistance connection probe；
The amplification includes the second power amplifier, third power amplifier, the 4th power amplifier, the with output circuit
Two triodes, the 4th triode, the 5th triode, the first diode, the second diode, the first zener diode, the second voltage stabilizing
Diode, the 9th capacitance, the 9th resistance, the tenth resistance, the 11st resistance, the 12nd resistance, the 13rd resistance, the 14th electricity
Resistance, the 23rd resistance, the 24th resistance, the second adjustable resistance and the 9th adjustable resistance, the anode connection of the first diode
One end of the detection coil of probe, the other end ground connection of detection coil, the anode of the first diode all the way through the 9th capacity earth,
All the way through the 24th resistance eutral grounding, the input positive terminal also all the way through the 14th resistance the second power amplifier of connection, second
The input negative terminal of power amplifier connects the anode of the first zener diode all the way, all the way through the tenth resistance eutral grounding, also all the way
The output terminal of the second power amplifier, the second zener diode and are connected after the 11st resistance and the second adjustable resistance successively
One zener diode differential concatenation, the anode of the second zener diode connect the output terminal of the second power amplifier, third power
The input positive terminal of amplifier connects the output terminal of the second power amplifier all the way, connects power output end, input negative terminal one all the way
Road is grounded, and another way connects the 4th power amplifier input positive terminal, output after the 9th adjustable resistance, the 23rd resistance successively
The base stage of the second triode of end connection, the collector of the second triode connect power output end all the way, and another way connects the 4th work(
Rate amplifier input positive terminal, through the 9th resistance eutral grounding, the input positive terminal of the 4th power amplifier connects the emitter of the second triode
Power output end is connect, input negative terminal is grounded all the way, and another way connects the collector of the 4th triode, and output terminal connects the four or three pole
The base stage of pipe, the emitter of the 4th triode connect the base stage of the 5th triode, the collector of the 4th triode and the five or three pole
The collector of pipe through the 12nd resistance connect power output end, the second diode cathode connection power output end, the two or two
The anode connection external power supply of pole pipe, the emitter of the 5th triode and ground output alkali concn signal；
One end of magnet exciting coil is successively through the 4th resistance and the 8th the first power amplifier output of capacitance connection, the other end
Ground connection, one end of detection coil connect the anode of the first diode, other end ground connection.
Particularly, the measuring circuit further includes temperature compensation unit, and the temperature compensation unit is single with excitation with oscillation
Member, amplification are electrically connected with output unit, for eliminating influence of the temperature to alkali concn test result.
Particularly, the temperature compensation unit includes the 5th power amplifier, the 6th power amplifier, the 7th power amplification
Device, third transistor, the 6th triode, the 7th triode, the 4th zener diode, the 5th zener diode, the 15th resistance,
16th resistance, the 17th resistance, the 18th resistance, the 20th resistance, the 21st resistance, the 22nd resistance, the 20th
Five resistance, the 26th resistance, the 5th adjustable resistance, the 6th adjustable resistance, the 8th adjustable resistance, the tenth adjustable resistance and thermoelectricity
Even, the 16th resistance one end connection power input, the other end is grounded after the 5th adjustable resistance and thermocouple successively, and the 18th
Resistance one end connects power input, and the other end is through the 17th resistance eutral grounding, the 5th power amplifier input positive terminal connection the 5th
The adjustable side of adjustable resistance, the 5th power amplifier input negative terminal connect the 18th resistance and the 17th resistance common end all the way,
It connects the 5th power amplifier output after the 25th resistance, the 6th adjustable resistance successively all the way, also passes through successively all the way
The 5th power amplifier output, the 4th voltage stabilizing two are connected after 4th zener diode of differential concatenation and the 5th zener diode
The anode of pole pipe connects the 5th power amplifier input negative terminal, and anode the 5th power amplifier of connection of the 5th zener diode is defeated
Outlet, the 5th power amplifier output connect the 6th power amplifier input positive terminal all the way, also all the way successively through the 20th
Third power amplifier input negative terminal, the 6th power amplifier input negative terminal connection the are connected after six resistance, the 8th adjustable resistance
Three transistor emitters, the 6th power amplifier output connection third transistor base stage, third transistor emitter pass through all the way
20th resistance eutral grounding also connects third transistor collector through the tenth adjustable resistance, the 22nd resistance successively all the way, the
Three transistor collectors connect power output end through the 21st resistance all the way, also the 7th power amplifier of connection input all the way
Anode, the 7th power amplifier input negative terminal are grounded all the way, and another way connects the 6th transistor emitter, the 7th power amplifier
Output terminal connects the 6th transistor base, and the 6th transistor emitter and the 7th transistor collector are connected through the 15th resistance
Power output end, the 6th transistor collector connect the 7th transistor base, the 7th transistor emitter and ground output detection temperature
Spend signal.
Particularly, the thermocouple is packaged using stainless steel.
Particularly, the magnet exciting coil and detection coil use ferrite bead.
Particularly, the magnet exciting coil and detection coil are packaged using epoxy resin.
Particularly, the lead-out wire of probe to the measuring circuit is packaged using nylon.
Particularly, first power amplifier uses LM386 chips.
The utility model proposes a kind of alkali concn tester, the sensing element of the alkali concn tester is encapsulated in corrosion-resistant
In material, the measure that can be realized to various corrosive solution alkali concns is not in direct contact with solution to be measured, so as to avoid corruption
The reliability and service life of tester greatly improved to the burn into pollution of sensing element and polarity effect in corrosion solution.Together
When, which also has the advantages that high certainty of measurement, stability are good.
Description of the drawings
Attached drawing described herein is used for providing further understanding the utility model embodiment, forms the one of the application
Part does not form the restriction to the utility model embodiment.In the accompanying drawings：
Fig. 1 is the alkali concn tester circuit schematic diagram that the utility model embodiment 1 provides.
Specific embodiment
For the purpose of this utility model, technical solution and advantage is more clearly understood, with reference to embodiment and attached drawing,
The utility model is described in further detail, and the exemplary embodiment and its explanation of the utility model are only used for explaining this
Utility model is not intended to limit the scope of the present invention.
Embodiment 1
Alkali concn tester described in the present embodiment includes probe and measuring circuit.
The probe includes two toroidal inductors of magnet exciting coil L1 and detection coil L2, magnet exciting coil L1 and detection line
Circle L2 iron cores are φ 30mm ferrite beads, the number of turn 100, and winding material line footpath is φ 0.21mm, electroplate.Probe
It is electrically connected between measuring circuit, to avoid solution corrosion connecting wire to be measured, the preferred embodiment of the present embodiment is uses
Nylon is packaged the lead-out wire of probe.Similarly, in order to avoid solution corrosion magnet exciting coil L1 to be measured and detection coil L2, and
Be further reduced leakage field interference, magnet exciting coil L1 and detection coil L2 be packaged using epoxy resin, it is coaxial after encapsulation, on
Under stack and be fixed together, immerse in solution to be measured.Epoxy resin has very high corrosion resistance, ensures the excitation wire after encapsulation
L1 and detection coil L2 not contact measured solution is enclosed, so as to which probe be avoided to be corroded, extends the service life of probe and measures essence
Degree.The measuring circuit is placed in outside solution to be measured, including oscillation and exciting unit, amplification and output unit.
The oscillation includes power supply V1, the first capacitance C1, the second capacitance C2, third capacitance C3, the 4th electricity with exciting unit
Hold C4, the 5th capacitance C5, the 6th capacitance C6, the 7th capacitance C7, the 8th capacitance C8, first resistor R1, second resistance R2, third electricity
Hinder R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the first adjustable resistance RP1,
First triode T1, third zener diode ZD3 and the first power amplifier U01, the 6th capacitance C6 and third voltage stabilizing two
Pole pipe ZD3 is in parallel, and the plus earth of third zener diode ZD3, the cathode of third zener diode ZD3 is all the way through the 7th resistance
R7 connection power supply V1 input terminals, collector of the another way through first resistor R1 the first triodes of connection T1, the first triode T1's
Collector connects the first power amplifier U01 after the 5th resistance R5, the 7th capacitance C7, the first adjustable resistance RP1 successively all the way
Input positive terminal, another way connect the base of the first triode T1 after the 8th resistance R8, second resistance R2,3rd resistor R3 successively
Pole, the 5th capacitance C5 connect the emitter of the first triode T1, other end ground connection, the first electricity with one end after the 6th resistance R6 parallel connections
Hold the collector that C1 one end connects the first triode T1, other end ground connection, second capacitance C2 one end connects the 8th resistance R8 and the
Two resistance R2 common ends, other end ground connection, the 4th capacitance C4 one end connection second resistance R2 and 3rd resistor R3 common ends, it is another
End ground connection, power supply V1 output terminals are through third capacitance C3 connection power supply V1 ground terminals, power supply V1 ground terminals ground connection, power amplifier
U01 input positive terminals connect power supply V1 input terminals, and power amplifier U01 input negative terminals ground connection, power amplifier U01 output terminals are successively
It pops one's head in through the 8th capacitance C8 and the 4th resistance R4 connections.
The amplification includes the second power amplifier U02, third power amplifier U03, the 4th power with output circuit and puts
Big device U04, the second triode T2, the 4th triode T4, the 5th triode T5, the first diode D1, the second diode D2, first
Zener diode ZD1, the second zener diode ZD2, the 9th capacitance C9, the 9th resistance R9, the tenth resistance R10, the 11st resistance
R11, the 12nd resistance R12, the 13rd resistance R13, the 14th resistance R14, the 23rd resistance R23, the 24th resistance
R24, the second adjustable resistance RP2 and the 9th adjustable resistance RP9, the detection coil L2's of the anode connection probe of the first diode D1
One end, the other end ground connection of detection coil L2, the anode of the first diode D1 is grounded all the way through the 9th capacitance C9, all the way through second
14 resistance R24 are grounded, the input positive terminal also all the way through the 14th resistance R14 the second power amplifiers of connection U02, the second work(
The input negative terminal of rate amplifier U02 connects the anode of the first zener diode ZD1 all the way, is grounded all the way through the tenth resistance R10, also
There is the output terminal for connecting the second power amplifier U02 after the 11st resistance R11 and the second adjustable resistance RP2 successively all the way, the
Two zener diode ZD2 and the first zener diode ZD1 differential concatenations, the anode of the second zener diode ZD2 connect the second work(
The output terminal of rate amplifier U02, the input positive terminal of third power amplifier U03 connect the defeated of the second power amplifier U02 all the way
Outlet connects power supply V1 output terminals all the way, and the input negative terminal of third power amplifier U03 is grounded all the way, and another way is successively through the
The 4th power amplifier U04 input positive terminals, third power amplifier are connected after nine adjustable resistance RP9, the 23rd resistance R23
The output terminal of U03 connects the base stage of the second triode T2, and the collector of the second triode T2 connects power supply V1 output terminals all the way, separately
The 4th power amplifier U04 input positive terminals are connected all the way, and the emitter of the second triode T2 is grounded through the 9th resistance R9, the 4th work(
The input positive terminal connection power supply V1 output terminals of rate amplifier U04, the input negative terminal of the 4th power amplifier U04 are grounded all the way, separately
The collector of the 4th triode T4 is connected all the way, the output terminal of the 4th power amplifier U04 connects the base stage of the 4th triode T4,
The emitter of 4th triode T4 connects the base stage of the 5th triode T5, the collector and the 5th triode T5 of the 4th triode T4
Collector through the 12nd resistance R12 connection power output ends, the cathode connection power supply V1 output terminals of the second diode D2, the
The anode connection external power supply of two diode D2, the emitter of the 5th triode T5 and ground output alkali concn signal.
One end of magnet exciting coil L1 exports successively through the 4th resistance R4 and the 8th capacitance C8 the first power amplifiers of connection U01
End, other end ground connection, one end of detection coil L2 connect the anode of the first diode D1, other end ground connection.
The operation principle of alkali concn tester is described in the present embodiment：In the oscillation and exciting unit, the first triode
T1, the first capacitance C1, third capacitance C3, second resistance R2,3rd resistor R3, the 6th resistance R6 constitute the oscillation of capacitance phase shift
Device.To ensure the stability of oscillator amplitude, power supply V1 uses three-terminal voltage-stabilizing power supply, meanwhile, the power supply of oscillator further passes through
Secondary pressure is carried out by the benchmark voltage stabilizing that third zener diode ZD3 and the 7th resistance R7 are formed, to reduce power supply V1 to oscillation
The influence of device amplitude.Oscillator output signal is sent into first after the 5th resistance R5, the 7th capacitance C7 and the first adjustable resistance RP1
Power amplifier U01 makees amplitude amplification, and amplified pumping signal is added on the magnet exciting coil L1 of probe, and it is steady to form an amplitude
Fixed ac-excited signal.
Magnet exciting coil L1 and detection coil L2 in the probe are the toroidal inductors of two mutually insulateds, by its point
Not Feng Zhuan after be solidified togather, the coaxial unicom of centre bore immerses probe in solution to be measured, and solution to be measured will pass through magnet exciting coil
The linked hole of L1 and detection coil L2.The ac-excited signal of amplitude stability vibrated and exciting unit generates is added in excitation wire
It encloses on L1, according to electromagnetic induction principle, then corresponding alternating flux is generated in magnet exciting coil L1.Since solution to be measured is electric Jie
Matter, conductive energy, therefore magnet exciting coil L1, which generate corresponding alternating flux, will make to generate sensing electric current Is in solution to be measured,
Form an electric current loop for intersecting at magnet exciting coil L1 and detection coil L2, the conductance of the current value of this electric current loop and solution to be measured
Rate is into ratio.Meanwhile this electric current loop makes to generate alternating magnetic field in detection coil L2 again, so as to make to generate voltage on detection coil L2
U2, U2 are proportional to the sensing electric current Is generated in solution to be measured.It is relevant in conclusion generating voltage U2 on detection coil L2
Sensing electric current Is is generated in solution to be measured, sensing electric current Is is generated in solution to be measured and is relevant to electrical conductivity of solution to be measured, therefore, is treated
Surveying the conductivity of solution can be obtained by measuring the voltage U2 generated on detection coil L2.Further, due to be measured molten
The conductivity of the alkali concn of liquid and solution to be measured is into certain proportionate relationship, and then by measuring the electricity generated on detection coil L2
Pressure U2 can obtain the alkali concn of solution to be measured.
In the amplification and output unit, the voltage signal generated on detection coil L2 becomes through the first diode D1 detections
After direct current signal, it is sent into the second power amplifier U02 and third power amplifier U03 and carries out ratio enlargement, then through the two or three pole
Pipe T2 carries out paraphase, obtains standard voltage signal, that is, obtains the voltage U2 generated on detection coil L2.For convenience of with computer or
Secondary meter interface, standard voltage signal form again through the 4th power amplifier U04, the 4th triode T4 and the 5th triode T5
Converter, export 4-20mA standard current signals.It should be noted that the voltage generated on detection coil L2
The sensing electric current Is generated in correspondence, solution to be measured between the sensing electric current Is generated in U2 and solution to be measured with it is to be measured
The correspondence between correspondence, electrical conductivity of solution to be measured and solution alkali concn to be measured between electrical conductivity of solution is current general
It is on the books in the technical solution of conductance method survey alkali concn used, it is the prior art, therefore according to the prior art, it is detected
The voltage U2 generated on coil L2 can obtain the alkali concn of solution to be measured.
It should be noted that the conductivity of solution to be measured is affected by temperature larger, same solution to be measured, temperature often increases by 10
Degree, conductivity relative increase 2%, therefore, the preferred embodiment of the present embodiment is increases in the alkali concn tester
Temperature compensation unit, the temperature compensation unit are electrically connected with vibrating with exciting unit, amplification with output unit, eliminate temperature
Influence to alkali concn test result.
The preferred embodiment of the present embodiment is that the temperature compensation unit includes the 5th power amplifier U05, the 6th work(
Rate amplifier U06, the 7th power amplifier U07, third transistor T3, the 6th triode T6, the 7th triode T7, the 4th voltage stabilizing
Diode ZD4, the 5th zener diode ZD5, the 15th resistance R15, the 16th resistance R16, the 17th resistance R17, the 18th
Resistance R18, the 20th resistance R20, the 21st resistance R21, the 22nd resistance R22, the 25th resistance R25, the 20th
Six resistance R26, the 5th adjustable resistance RP5, the 6th adjustable resistance RP6, the 8th adjustable resistance RP8, the tenth adjustable resistance RP10 and
Thermocouple PT100, the 16th resistance R16 one end connection power supply V1 input terminals, the other end is successively through the 5th adjustable resistance RP5 and warm
It being grounded after galvanic couple PT100, the 18th resistance R18 one end connection power supply V1 input terminals, the other end is grounded through the 17th resistance R17,
5th power amplifier U05 input positive terminals connect the adjustable side of the 5th adjustable resistance RP5, and the 5th power amplifier U05 inputs are negative
End connects the 18th resistance R18 and the 17th resistance R17 common ends all the way, all the way successively through the 25th resistance R25, the 6th can
The 5th power amplifier U05 output terminals are connected after adjusting resistance RP6, also the 4th zener diode through differential concatenation successively all the way
The 5th power amplifier U05 output terminals are connected after ZD4 and the 5th zener diode ZD5, the anode of the 4th zener diode ZD4 connects
The 5th power amplifier U05 input negative terminals are connect, the anode of the 5th zener diode ZD5 connects the 5th power amplifier U05 outputs
End, the 5th power amplifier U05 output terminals connect the 6th power amplifier U06 input positive terminals all the way, also all the way successively through the
Third power amplifier U03 input negative terminals, the 6th power amplifier are connected after 26 resistance R26, the 8th adjustable resistance RP8
U06 input negative terminals connect third transistor T3 emitters, the 6th power amplifier U06 output terminals connection third transistor T3 bases
Pole, third transistor T3 emitters all the way through the 20th resistance R20 be grounded, also all the way successively through the tenth adjustable resistance RP10,
22nd resistance R22 connection third transistor T3 collectors, third transistor T3 collectors are all the way through the 21st resistance R21
Power supply V1 output terminals are connected, also connect the 7th power amplifier U07 input positive terminals, the 7th power amplifier U07 inputs all the way
Negative terminal is grounded all the way, and another way connects the 6th triode T6 emitters, and the 7th power amplifier U07 output terminals connect the six or three pole
Pipe T6 base stages, the 6th triode T6 emitters and the 7th triode T7 collectors are defeated through the 15th resistance R15 connection power supplys V1
Outlet, the 6th triode T6 collectors connect the 7th triode T7 base stages, the 7th triode T7 emitters and ground output detection temperature
Spend signal.
The temperature compensation unit operation principle is：Thermocouple PT100, the 16th resistance R16, the 17th resistance R17,
18 resistance R18 and the 6th adjustable resistance RP6 composition measuring bridges, wherein, the 6th adjustable resistance RP6 is zero potentiometer, the
Five power amplifier U05 are electric bridge output amplifier, amplified output signal are divided into two-way, all the way through the 26th resistance
Third power amplifier U03 is sent into the 8th adjustable resistance RP8 and does temperature-compensating, and the size of compensating proportion is by the 8th adjustable resistance
RP8 is determined.Another way is sent into the 6th power amplifier U06 and third transistor T3, using the 7th power amplifier U07, the
Six triode T6, the 7th triode T7 composition converter, using output become 4-20mA standard current signals as
Temperature signal exports, therefore temperature-compensation circuit is other than making temperature-compensating, meanwhile, also serve as temperature survey output signal.It is described
The detection coil L2 voltage signals of the temperature measurement signal of temperature compensation unit output and amplification and output unit output can be with
Access microcontroller further calculate or access display screen is shown.
The preferred embodiment of the present embodiment is that the thermocouple uses the preferable 1Cr18Ni9Tia stainless steels of performance ratio
It is packaged, to be further ensured that the service life of thermocouple and precision.
The preferred embodiment of the present embodiment is that the magnet exciting coil and detection coil use ferrite bead.Iron oxygen
Body be it is a series of meet oxide material containing iron oxide, saturation induction density is very low, advantageously reduces eddy-current loss.
The preferred embodiment of the present embodiment is that the magnet exciting coil and detection coil are sealed using epoxy resin
Dress, epoxy resin have excellent corrosion resistance, greatly improve reliability and the service life of probe.
The preferred embodiment of the present embodiment is that the lead-out wire of probe to the measuring circuit is packaged using nylon.
The preferred embodiment of the present embodiment is that first power amplifier uses LM386 chips.
It is appropriate that other electronic component specifications described in the present embodiment are chosen by those skilled in the art according to on-site actual situations
Specification.
Alkali concn tester described in the present embodiment is tested, specific experiment data are as follows：
Alkali concn detection data
Temperature-compensating detection data
The detection data that above-mentioned experiment obtains shows that the linearity of the alkali concn tester and the controlled range of precision exist
In the range of 3%, have the advantages that test result is accurate, precision is high, stability is good.
The technical solution of the utility model immerses probe in solution to be measured, and measuring circuit is sent out to the magnet exciting coil of probe
Go out pumping signal, corresponding voltage is generated in the detection coil of probe, measuring circuit again measures detection coil voltage value, root
According between the sensing current value, electrical conductivity of solution to be measured, solution alkali concn to be measured generated in detection coil voltage value, solution to be measured
Correspondence obtain the alkali concn numerical value of solution to be measured.The probe is encapsulated in resistant material, not direct with solution to be measured
Contact can realize the measure to various corrosive solution alkali concns, avoid corrosive solution and the burn into of probe is polluted
And polarity effect, the reliability and service life of tester greatly improved.Meanwhile the alkali concn tester also has measurement essence
The advantages of degree is high, stability is good.
Above-described specific embodiment, the purpose of this utility model, technical solution and advantageous effect have been carried out into
One step is described in detail, it should be understood that the foregoing is merely specific embodiment of the present utility model, is not used to limit
Determine the scope of protection of the utility model, within the spirit and principle of the utility model, any modification for being made equally is replaced
It changes, improve, should be included within the scope of protection of this utility model.
Claims (8)
1. a kind of alkali concn tester, it is characterised in that including probe, measuring circuit, the probe and measuring circuit electrical connection,
The probe includes two toroidal inductors of magnet exciting coil and detection coil, and magnet exciting coil and detection coil are using resistance to
Corrosion material coaxially stacks after being packaged be fixed together after immerse in solution to be measured；
The measuring circuit is placed in outside solution to be measured, including oscillation with exciting unit, amplification and output unit,
It is described oscillation with exciting unit include power supply, the first capacitance, the second capacitance, third capacitance, the 4th capacitance, the 5th capacitance,
6th capacitance, the 7th capacitance, the 8th capacitance, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th
Resistance, the 7th resistance, the 8th resistance, the first adjustable resistance, the first triode, third zener diode and the first power amplification
Device, the 6th capacitance is in parallel with third zener diode, the plus earth of third zener diode, third zener diode
Cathode all the way through the 7th resistance connect power input, another way through first resistor connect the first triode collector, first
It is defeated that the collector of triode after the 5th resistance, the 7th capacitance, the first adjustable resistance connects the first power amplifier successively all the way
Enter anode, another way connects the base stage of the first triode, the 5th capacitance after the 8th resistance, second resistance, 3rd resistor successively
The emitter of the first triode, other end ground connection, first capacitance one end connection the one or three are connect with one end after the 6th resistor coupled in parallel
The collector of pole pipe, other end ground connection, second capacitance one end connect the 8th resistance and second resistance common end, and the other end is grounded,
4th capacitance one end connects second resistance and 3rd resistor common end, and other end ground connection, power output end is through third capacitance connection
Power ground end, power ground end ground connection, power amplifier input positive terminal connection power input, input negative terminal ground connection, output
End is successively through the 8th capacitance and the 4th resistance connection probe；
The amplification includes the second power amplifier, third power amplifier, the 4th power amplifier, the two or three with output circuit
Pole pipe, the 4th triode, the 5th triode, the first diode, the second diode, the first zener diode, two pole of the second voltage stabilizing
Pipe, the 9th capacitance, the 9th resistance, the tenth resistance, the 11st resistance, the 12nd resistance, the 13rd resistance, the 14th resistance,
23 resistance, the 24th resistance, the second adjustable resistance and the 9th adjustable resistance, the anode connection probe of the first diode
One end of detection coil, the other end ground connection of detection coil, the anode of the first diode pass through all the way all the way through the 9th capacity earth
24th resistance eutral grounding, also connects the input positive terminal of the second power amplifier through the 14th resistance all the way, and the second power is put
The input negative terminal of big device connects the anode of the first zener diode all the way, all the way through the tenth resistance eutral grounding, also passes through successively all the way
The output terminal of the second power amplifier, the second zener diode and the first voltage stabilizing are connected after 11st resistance and the second adjustable resistance
Diodes in reverse series, the anode of the second zener diode connect the output terminal of the second power amplifier, third power amplifier
Input positive terminal connect the output terminal of the second power amplifier all the way, connect power output end all the way, input negative terminal is grounded all the way,
Another way connects the 4th power amplifier input positive terminal, output terminal connection after the 9th adjustable resistance, the 23rd resistance successively
The base stage of second triode, the collector of the second triode connect power output end all the way, and another way connects the 4th power amplification
Device input positive terminal, the emitter of the second triode is through the 9th resistance eutral grounding, the input positive terminal connection power supply of the 4th power amplifier
Output terminal, input negative terminal are grounded all the way, and another way connects the collector of the 4th triode, and output terminal connects the base of the 4th triode
Pole, the emitter of the 4th triode connect the base stage of the 5th triode, the collector of the 4th triode and the collection of the 5th triode
Electrode connects power output end through the 12nd resistance, and the cathode of the second diode connects power output end, the second diode
Anode connects external power supply, the emitter of the 5th triode and ground output alkali concn signal；
One end of magnet exciting coil is successively through the 4th resistance and the 8th the first power amplifier output of capacitance connection, another termination
Ground, one end of detection coil connect the anode of the first diode, other end ground connection.
2. alkali concn tester according to claim 1, which is characterized in that the measuring circuit further includes temperature-compensating list
Member, the temperature compensation unit is electrically connected with vibrating with exciting unit, amplification with output unit, for eliminating temperature to alkali dense
Spend the influence of test result.
3. alkali concn tester according to claim 2, which is characterized in that the temperature compensation unit includes the 5th power
Amplifier, the 6th power amplifier, the 7th power amplifier, third transistor, the 6th triode, the 7th triode, the 4th are surely
Press diode, the 5th zener diode, the 15th resistance, the 16th resistance, the 17th resistance, the 18th resistance, the 20th electricity
It is resistance, the 21st resistance, the 22nd resistance, the 25th resistance, the 26th resistance, the 5th adjustable resistance, the 6th adjustable
Resistance, the 8th adjustable resistance, the tenth adjustable resistance and thermocouple, the 16th resistance one end connection power input, the other end according to
Secondary to be grounded after the 5th adjustable resistance and thermocouple, the 18th resistance one end connection power input, the other end is through the 17th electricity
Resistance ground connection, the 5th power amplifier input positive terminal connect the adjustable side of the 5th adjustable resistance, the 5th power amplifier input negative terminal
The 18th resistance and the 17th resistance common end are connected all the way, are connected after the 25th resistance, the 6th adjustable resistance successively all the way
The 5th power amplifier output is connect, also the 4th zener diode and the 5th zener diode through differential concatenation successively all the way
The 5th power amplifier output is connected afterwards, the anode of the 4th zener diode connects the 5th power amplifier input negative terminal, the
The anode of five zener diodes connects the 5th power amplifier output, and the 5th power amplifier output connects the 6th work(all the way
Rate amplifier input positive terminal also connects third power amplifier after the 26th resistance, the 8th adjustable resistance successively all the way
Input negative terminal, the 6th power amplifier input negative terminal connection third transistor emitter, the connection of the 6th power amplifier output
Third transistor base stage, third transistor emitter is all the way through the 20th resistance eutral grounding, also all the way successively through the tenth adjustable electric
Resistance, the 22nd resistance connection third transistor collector, third transistor collector connect electricity through the 21st resistance all the way
Source output terminal also connects the 7th power amplifier input positive terminal all the way, and the 7th power amplifier input negative terminal is grounded all the way, separately
The 6th transistor emitter is connected all the way, and the 7th power amplifier output connects the 6th transistor base, the 6th triode hair
Emitter-base bandgap grading and the 7th transistor collector connect power output end, the 6th transistor collector connection the seven or three through the 15th resistance
Pole pipe base stage, the 7th transistor emitter and ground output detection temperature signal.
4. alkali concn tester according to claim 3, which is characterized in that the thermocouple is sealed using stainless steel
Dress.
5. alkali concn tester according to claim 1, which is characterized in that the magnet exciting coil and detection coil use
Ferrite bead.
6. alkali concn tester according to claim 1, which is characterized in that the magnet exciting coil and detection coil use
Epoxy resin is packaged.
7. alkali concn tester according to claim 1, which is characterized in that the lead-out wire of probe to the measuring circuit is adopted
It is packaged with nylon.
8. alkali concn tester according to claim 1, which is characterized in that first power amplifier uses LM386
Chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721556272.5U CN207571072U (en) | 2017-11-20 | 2017-11-20 | A kind of alkali concn tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721556272.5U CN207571072U (en) | 2017-11-20 | 2017-11-20 | A kind of alkali concn tester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231367A (en) * | 2019-07-05 | 2019-09-13 | 宣城亨泰电子化学材料有限公司 | A kind of online Concentration Testing analyzer |
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2017
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231367A (en) * | 2019-07-05 | 2019-09-13 | 宣城亨泰电子化学材料有限公司 | A kind of online Concentration Testing analyzer |
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