CN211148740U - Non-isolated contact conductivity detector - Google Patents
Non-isolated contact conductivity detector Download PDFInfo
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- CN211148740U CN211148740U CN201921509316.8U CN201921509316U CN211148740U CN 211148740 U CN211148740 U CN 211148740U CN 201921509316 U CN201921509316 U CN 201921509316U CN 211148740 U CN211148740 U CN 211148740U
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- circuit board
- signal processing
- processing circuit
- conductivity detector
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Abstract
The utility model discloses a non-isolated form contact conductivity detector, including signal generator ground connection metal shell, detection pond and signal processing circuit board, install signal processing circuit board and control circuit board through the bolt in the signal generator ground connection metal shell, lay 555 chips, detection pond, connecting pipe and outer axle on the signal processing circuit board, outer axle is including arousing electrode and receiving electrode, it is equipped with the copper foil to arouse to fill up between electrode and the receiving electrode, the rectifier has been laid to one end on the control circuit board. So as to reduce the interference of external signals to the maximum extent.
Description
Technical Field
The utility model relates to a signal generator technical field, in particular to non-isolated form contact conductivity detector.
Background
The existing signal generator is easy to generate the situation of unstable signals in the using process and the situation of signal interference between self-working equipment and external equipment, and therefore a non-isolation type contact conductivity detector is provided.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a non-isolated contact conductivity detector, which can effectively solve the problems of the background art.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a non-isolated contact type conductivity detector comprises a signal generator grounding metal shell, a detection pool and a signal processing circuit board, wherein the signal processing circuit board and a control circuit board are installed in the signal generator grounding metal shell through bolts, a 555 chip, the detection pool, a connecting pipe and an outer shaft are arranged on the signal processing circuit board, the outer shaft comprises an excitation electrode and a receiving electrode, a copper foil is arranged between the excitation electrode and the receiving electrode in a padded mode, and a rectifier is arranged at one end of the control circuit board.
Furthermore, the output end of the control circuit board is electrically connected with the input end of the signal processing circuit board through a lead, the detection cell is electrically connected with the excitation electrode, and the pipe wall of the connecting pipe is coupled with the receiving electrode to form a loop.
Furthermore, the connecting wires arranged in the grounding metal shell of the signal generator are all shielding wires.
Further, the detection cell is a conductivity cell.
Furthermore, insulating gaskets are padded at the bottoms of the signal processing circuit board and the control circuit board.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the detection cell of the conductivity cell can reduce the diffusion outside the column to the maximum extent, high-frequency alternating voltage (18KHz, 20V square wave) is applied to the excitation electrode through the control circuit board, and a loop is formed by coupling the solution (or the tube wall) in the connecting tube and the receiving electrode; the weak change of the solution resistance in the solution is amplified and rectified by a signal processing circuit through a receiving electrode and then converted into an observable direct current signal;
2. a copper foil (connected to circuit ground) of 10mm diameter and 0.1mm thickness was placed between the excitation electrode and the receiving electrode to shield the air coupling between the excitation electrode and the receiving electrode;
3. the detection cell and the signal processing circuit are respectively sealed in a grounded metal shell to shield external electromagnetic interference; all connecting wires are shielded wires to reduce external signal interference to the maximum extent.
Drawings
Fig. 1 is a schematic view of a non-isolated contact conductivity detector according to the present invention.
Fig. 2 is a schematic view of a signal processing circuit board in a non-isolated contact conductivity detector according to the present invention.
Fig. 3 is a schematic circuit connection diagram of a non-isolated contact conductivity detector according to the present invention.
In the figure: 1. a signal generator grounding metal shell; 2. a detection cell; 3. a signal processing circuit board; 4. 555 chips; 5. a control circuit board; 6. a connecting pipe; 7. an outer shaft; 8. an excitation electrode; 9. a receiving electrode; 11. a rectifier; 12. copper foil; 14. and an insulating gasket.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.
As shown in fig. 1-3, a non-isolated contact conductivity detector comprises a signal generator grounded metal shell 1, a detection cell 2 and a signal processing circuit board 3, wherein the signal processing circuit board 3 and a control circuit board 5 are installed in the signal generator grounded metal shell 1 through bolts, a 555 chip 4, the detection cell 2, a connecting pipe 6 and an outer shaft 7 are arranged on the signal processing circuit board 3, the outer shaft 7 comprises an excitation electrode 8 and a receiving electrode 9, a copper foil 12 is padded between the excitation electrode 8 and the receiving electrode 9, and a rectifier 11 is arranged at one end of the control circuit board 5.
The output end of the control circuit board 5 is electrically connected with the input end of the signal processing circuit board 3 through a lead, the detection cell 2 is electrically connected with the excitation electrode 8, and the pipe wall of the connecting pipe 6 is coupled with the receiving electrode 9 to form a loop.
In this embodiment, as shown in fig. 2, a person controls the operation of the signal processing circuit board 3 through the control circuit board 5.
And connecting wires arranged in the signal generator grounding metal shell 1 are all shielding wires.
In this embodiment, as shown in fig. 1, all the connecting wires are shielded wires to reduce the external signal interference to the maximum extent.
Wherein, the detection cell 2 is a conductance cell.
In this embodiment, as shown in fig. 2, the detection cell 2, which is a conductivity cell, can minimize the diffusion outside the column.
Wherein, the bottom of the signal processing circuit board 3 and the bottom of the control circuit board 5 are both padded with insulating gaskets 14.
In the embodiment, as shown in fig. 2, the insulating pad 14 can provide good insulation between the signal processing circuit board 3 and the control circuit board 5 and the signal generator grounding metal shell 1.
It should be noted that, the utility model relates to a non-isolated contact conductivity detector, during operation, the detection cell 2 of the conductivity cell can reduce the column external diffusion to the utmost extent, the high frequency alternating voltage 10(18KHz, 20V square wave) is applied to the exciting electrode 8 through the control circuit board 5, and the solution (or pipe wall) in the connecting pipe 6 is coupled with the receiving electrode 9 to form a loop; the weak change of the solution resistance in the solution is converted into an observable direct current signal after being amplified by a signal processing circuit and rectified by a rectifier 11 through a receiving electrode; a copper foil 12 (connected to circuit ground) of 10mm diameter and 0.1mm thickness was placed between the excitation electrode 8 and the reception electrode 9 to shield the air coupling between the excitation electrode 8 and the reception electrode 9; the detection cell 2 and the signal processing circuit 3 are respectively sealed in the grounded metal shell 1 to shield external electromagnetic interference; all connecting wires are shielded wires to reduce external signal interference to the maximum extent.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The utility model provides a non-isolated form contact conductivity detector, includes signal generator ground connection metal casing (1), detects pond (2) and signal processing circuit board (3), its characterized in that, install signal processing circuit board (3) and control circuit board (5) through the bolt in signal generator ground connection metal casing (1), lay 555 chip (4), detect pond (2), connecting pipe (6) and outer axle (7) on signal processing circuit board (3), outer axle (7) are including exciting electrode (8) and receiving electrode (9), the pad is equipped with copper foil (12) between exciting electrode (8) and receiving electrode (9), rectifier (11) have been laid to one end on control circuit board (5).
2. A non-isolated contact conductivity detector according to claim 1, wherein: the output end of the control circuit board (5) is electrically connected with the input end of the signal processing circuit board (3) through a lead, the detection cell (2) is electrically connected with the excitation electrode (8), and the pipe wall of the connecting pipe (6) is coupled with the receiving electrode (9) to form a loop.
3. A non-isolated contact conductivity detector according to claim 1, wherein: and connecting wires arranged in the signal generator grounding metal shell (1) are all shielding wires.
4. A non-isolated contact conductivity detector according to claim 1, wherein: the detection cell (2) is a conductance cell.
5. A non-isolated contact conductivity detector according to claim 1, wherein: and insulating gaskets (14) are padded at the bottoms of the signal processing circuit board (3) and the control circuit board (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921509316.8U CN211148740U (en) | 2019-09-11 | 2019-09-11 | Non-isolated contact conductivity detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921509316.8U CN211148740U (en) | 2019-09-11 | 2019-09-11 | Non-isolated contact conductivity detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211148740U true CN211148740U (en) | 2020-07-31 |
Family
ID=71759758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921509316.8U Active CN211148740U (en) | 2019-09-11 | 2019-09-11 | Non-isolated contact conductivity detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211148740U (en) |
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2019
- 2019-09-11 CN CN201921509316.8U patent/CN211148740U/en active Active
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