CN2459657Y - Salinometer - Google Patents
Salinometer Download PDFInfo
- Publication number
- CN2459657Y CN2459657Y CN 00226592 CN00226592U CN2459657Y CN 2459657 Y CN2459657 Y CN 2459657Y CN 00226592 CN00226592 CN 00226592 CN 00226592 U CN00226592 U CN 00226592U CN 2459657 Y CN2459657 Y CN 2459657Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- voltage
- inverting input
- output terminal
- resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model belongs to the field of chemical engineering instrument. Two electric insulating parallel metal plates are made into a sensor and immersed in solution needing to be measured. One of the metal plates is communicated with positive and negative alternate voltage having fixed amplitude, and the other metal plate is connected with the inverting input end of an inverse proportional amplifier composed of an operational amplifier. Direct current voltage is output via a full-wave rectifying circuit and a filter circuit, and the value of the direct current voltage and the salinity of the solution are proportional.
Description
The utility model belongs to the chemical instruments field.
Salinometer is one of basic chemical instruments, use very extensive, the measuring method of this class instrument of great majority is: the parallel metal sheet with two electrical isolations is made sensor, this sensor is immersed in the solution to be measured, on two sheet metals, connect alternating voltage, measure the AC resistance of sensor, calculate electricity by the inverse of resistance again and lead, according to the salinity and the relation that the conductivity of solution is directly proportional of solution, calculate the salinity value of solution.This method is because salinity value and resistance value are inversely prroportional relationships, the reading inconvenience; For making the direct reading of tester, many products adopt microcomputers, cause involve great expense, keep in repair difficult.
The purpose of this utility model provides the instrument that a kind of DC voltage of output is directly proportional with the solution salinity, and cost is low, easy to maintenance.
The purpose of this utility model is achieved in that with the parallel metal sheet of two electrical isolations makes sensor, it is immersed in the solution to be measured, connect the voltage of the positive and negative alternation of fixed amplitude therein on sheet metal, another sheet metal is connected on the inverting input of the anti-phase proportional amplifier of being made up of operational amplifier, through full-wave rectifying circuit, filtering circuit is exported a DC voltage, and this magnitude of voltage is proportional to the salinity of solution.
Concrete structure of the present utility model is provided by following examples and accompanying drawing.
The utility model is made up of oscillator, voltage follower, anti-phase proportional amplifier, full-wave rectifying circuit, filtering circuit, output circuit.
Integrated circuit (IC)
1Select digital circuit CD4060 for use, resistance R
1One terminate at IC
1CP
1Pin, resistance R
2With potentiometer W
1Series connection, one terminates at IC
1Pin
End, capacitor C
1One terminate at pin CP
0End is R
1, W
1And C
1The other end connect together, by IC
1, R
1, R
2, W
1, C
1Form square-wave oscillator circuit, IC
1Pin Q
4, Q
7, Q
10, Q
13Be output terminal, by K switch
1With potentiometer W
1Selected output signal frequency; Integrated circuit (IC)
2Select operational amplifier OP-27 for use, its output terminal and inverting input are connected together, form voltage follower, by IC
1The signal of output is received potentiometer W
2An end points, potentiometer W
2Another end points ground connection, in ask that tap passes through resistance R
3With IC
2In-phase input end links to each other, IC
2Output voltage be Va, adjust W
2, the amplitude that makes Va is 1.0000V; Integrated circuit (IC)
3Select operational amplifier OP-27 for use, resistance R x is that sensor immerses the equivalent resistance that presents in the solution to be measured, and a slice sheet metal in the sensor is received integrated circuit (IC)
2Output terminal, another sheet sheet metal is connected on integrated circuit (IC)
3Inverting input, R
FBe feedback resistance, connect IC with this resistance
3Inverting input and output terminal, by IC
3, R
1, R
xForm anti-phase proportional amplifier, IC
3Output voltage be V
bR
FForm 4 groups of different resistance values by 4 resistance with 4 potentiometers, by K switch
2Select different ranges, to adapt to the solution of different salinity; Because the salinity X of solution is proportional to the conductivity of solution, conductivity is proportional to the electric conductivity value G that sensor records
X, and G
X=1/R
X, by the fundamental formular of anti-phase proportional amplifier as can be known, V
b=-(R
F/ R
X) V
a, so V
bBe proportional to the salinity X of solution; Integrated circuit (IC)
4Select operational amplifier OP-07 for use, its output terminal is linked to each other with inverting input, use resistance R
9Connect IC
4In-phase input end and IC
3Output terminal, integrated circuit (IC)
4Form voltage follower; Integrated circuit (IC)
5Select double operational integrated circuit F747 for use, by IC
5With 4 diode D
1-D
4Form full-wave rectifying circuit, diode D
1With D
3, be connected on respectively between the inverting input and output terminal of two amplifiers; Diode D
2With D
4Be connected on the output terminal of two amplifiers; Capacitor C
2, C
3With resistance R
15Form filtering circuit; Integrated circuit (IC)
6Select operational amplifier OP-07 for use, its output terminal is linked to each other with inverting input, form voltage follower, use resistance R
17Connect IC
6In-phase input end and the output terminal of filtering circuit, integrated circuit (IC)
6Output voltage V
0Be DC voltage, V
0Be proportional to b point voltage V
b, therefore V as can be known
0=β X, β are and R
FRelevant constant, X are the salinity of solution.I.e. Shu Chu DC voltage V
0Be proportional to the salinity X of solution.
Tackling instrument before use and calibrate, is that 10%, 1.0%, 0.1%, 0.01% standard solution is tested to salinity respectively, K switch
2Get to respectively on 1,2,3,4 grade, adjust potentiometer W
4-W
7Value, make V
0Corresponding with the salinity value of solution.
Computing amplification circuit IC
2, IC
3Selecting OP-27 for use, is because this integrated circuit has the output short circuit protection function.
Measure the salinity of solution with surveying the electric method of leading, often carry out temperature correction by following formula:
X
0=Xt/ (1+0.019 Δ t), wherein Δ t=t ℃-25 ℃, t ℃ is the temperature of solution when measuring, Xt is the salinity value that records when temperature is t ℃, X
0Be the salinity value of same detected solution in the time of 25 ℃.
Claims (2)
1, a kind of instrument of measuring the solution salinity, it is characterized in that: the parallel metal sheet with two electrical isolations is made sensor, it is immersed in the solution to be measured, connect the voltage of the positive and negative alternation of fixed amplitude therein on sheet metal, another sheet metal is connected on the inverting input of the anti-phase proportional amplifier of being made up of operational amplifier, through full-wave rectifying circuit, and filtering circuit, export a DC voltage, this magnitude of voltage is proportional to the salinity of solution.
2, salinometer circuit according to claim 1 is made up of oscillatory circuit, voltage follower, anti-phase proportional amplifier, full-wave rectifying circuit, filtering circuit, voltage follower circuit, it is characterized in that: integrated circuit (IC)
1Select digital circuit CD4060 for use, resistance R
1One terminate at IC
1CP
1Pin, resistance R
2With potentiometer W
1Series connection, one terminates at IC
1Pin
End, capacitor C
1One terminate at pin CP
0End is R
1, W
1And C
1The other end connect together, by IC
1, R
1, R
2, W
1, C
1Form square-wave oscillator circuit, by K switch
1With potentiometer W
1Selected output signal frequency; Integrated circuit (IC)
2Select operational amplifier OP-27 for use, its output terminal and inverting input are connected together, form voltage follower, by IC
1The signal of output is received potentiometer W
2An end points, resistance R is passed through in tap in the middle of it
3With IC
2In-phase input end links to each other, and adjusts W
2, make IC
2The amplitude of output voltage is 1.0000V; Integrated circuit (IC)
3Select operational amplifier OP-27 for use, a slice sheet metal in the sensor is received IC
2Output terminal, another sheet sheet metal is received IC
3Inverting input, R
FBe feedback resistance, connect IC with this resistance
3Inverting input and output terminal, by IC
3, R
F, R
XForm anti-phase proportional amplifier; Integrated circuit (IC)
4Select OP-07 for use, its output terminal is linked to each other with inverting input, form voltage follower; Integrated circuit (IC)
5Select double operational F747 for use, diode D
1With D
3, be connected between the inverting input and output terminal of two amplifiers diode D respectively
2With D
4Be connected on the output terminal of two amplifiers, by IC
5With 4 diode D
1-D
4Form full-wave rectifying circuit; Capacitor C
2, C
3With resistance R
15Form filtering circuit; Integrated circuit (IC)
6Select operational amplifier OP-07 for use, its output terminal is linked to each other with inverting input, form voltage follower, its output dc voltage V
0Be proportional to the salinity of solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00226592 CN2459657Y (en) | 2000-07-10 | 2000-07-10 | Salinometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00226592 CN2459657Y (en) | 2000-07-10 | 2000-07-10 | Salinometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2459657Y true CN2459657Y (en) | 2001-11-14 |
Family
ID=33590401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00226592 Expired - Fee Related CN2459657Y (en) | 2000-07-10 | 2000-07-10 | Salinometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2459657Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141534A (en) * | 2011-01-18 | 2011-08-03 | 中国地质调查局水文地质环境地质调查中心 | Seawater invasion monitoring method and distributed conductivity geological disaster monitoring device |
| CN110320244A (en) * | 2019-07-29 | 2019-10-11 | 山东省科学院海洋仪器仪表研究所 | A kind of seawater salinity measuring system and method based on orthogonal lock-in-amplifier technology |
-
2000
- 2000-07-10 CN CN 00226592 patent/CN2459657Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141534A (en) * | 2011-01-18 | 2011-08-03 | 中国地质调查局水文地质环境地质调查中心 | Seawater invasion monitoring method and distributed conductivity geological disaster monitoring device |
| CN102141534B (en) * | 2011-01-18 | 2013-09-04 | 中国地质调查局水文地质环境地质调查中心 | Seawater invasion monitoring method and distributed conductivity geological disaster monitoring device |
| CN110320244A (en) * | 2019-07-29 | 2019-10-11 | 山东省科学院海洋仪器仪表研究所 | A kind of seawater salinity measuring system and method based on orthogonal lock-in-amplifier technology |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |