CN114813865B - PH and dissolved oxygen general split type sensor - Google Patents
PH and dissolved oxygen general split type sensor Download PDFInfo
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- CN114813865B CN114813865B CN202210322639.6A CN202210322639A CN114813865B CN 114813865 B CN114813865 B CN 114813865B CN 202210322639 A CN202210322639 A CN 202210322639A CN 114813865 B CN114813865 B CN 114813865B
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 107
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 107
- 239000001301 oxygen Substances 0.000 title claims abstract description 107
- 238000006243 chemical reaction Methods 0.000 claims abstract description 64
- 238000007789 sealing Methods 0.000 claims abstract description 49
- 239000003990 capacitor Substances 0.000 claims description 34
- 239000007788 liquid Substances 0.000 claims description 8
- 239000000654 additive Substances 0.000 claims description 7
- 230000000996 additive effect Effects 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000004891 communication Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012800 visualization Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/302—Electrodes, e.g. test electrodes; Half-cells pH sensitive, e.g. quinhydron, antimony or hydrogen electrodes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
Abstract
The invention relates to a split type sensor for pH and dissolved oxygen, wherein a head shell and a tail shell are respectively arranged at two ends of a shell, the shell is a hollow circular ring, one end of the shell is detachably connected with the head shell through a head fixing bolt, the other end of the shell is detachably connected with the tail shell through a tail fixing bolt, one end of the head shell is provided with an annular head sealing groove, one end of the tail shell is provided with an annular tail sealing groove, the shell and the tail shell are sealed at the tail sealing groove through a tail sealing ring, the shell and the head shell are sealed at the head sealing groove through the head sealing ring, a data acquisition card is detachably connected in the tail shell, the tail shell is in threaded fit with a waterproof joint, the waterproof joint is hollow, and a light guide column is arranged on the data acquisition card. The invention has simple structure, convenient maintenance and replacement, realizes the purpose of sensor function conversion by only replacing small parts, reduces the product mold opening cost and improves the utilization rate of single parts.
Description
Technical Field
The invention relates to the technical field of sensor equipment, in particular to a pH and dissolved oxygen universal split sensor which has a simple structure, is convenient to overhaul and replace, achieves the purpose of sensor function conversion by only replacing small parts of accessories, reduces the product die sinking cost and improves the utilization rate of single accessories.
Background
The intelligent sensor is also called a digital sensor, and the acquired analog signals are converted into digital signals through a built-in data acquisition module, so that the purpose of measuring different types of data is generally achieved according to different measuring accessories. The existing intelligent sensor is basically measured by adopting integral injection molding and adding accessories, so that the use situation of a sensor shell is limited by the type of measurement data, different functions cannot be realized by replacing a small number of parts even if the sensor is a split type sensor, the whole mold is required to be opened again for the function replacement in the manufacturing process, and the cost is higher and not cost-effective; meanwhile, when the sensor of the same type in the current stage transmits information with the instrument, if the communication fails, the sensor cannot inquire whether the sensor is an instrument problem or an electrode problem, and the maintenance is complicated.
The service life of the electrode in the sensor is short, the service life of the electrode is generally one year, and the service life of the data acquisition module in the sensor is long, so that the sensor is extremely wasted if the electrode is replaced integrally after being damaged. The pH is similar to the working principle of the dissolved oxygen sensor, the data acquisition functions of the pH sensor and the dissolved oxygen sensor can be integrated, the production efficiency is improved, and the two functions are realized on one sensor to be possible.
The utility model provides a simple structure, convenient maintenance and change, only change the purpose that just realizes sensor function conversion of fractional accessory, reduced the product die sinking cost, improved the general split type sensor of pH and dissolved oxygen of single accessory utilization ratio.
Disclosure of Invention
The invention aims to provide the split type sensor which is simple in structure, convenient to overhaul and replace, capable of achieving the purpose of sensor function conversion by replacing only a small part of accessories, low in product die sinking cost and high in single accessory utilization rate and is universal in pH and dissolved oxygen.
A split sensor for pH and dissolved oxygen comprising:
the shell comprises a shell body, wherein the two ends of the shell body are respectively provided with a head shell and a tail shell, the shell body is a hollow circular ring, one end of the shell body is detachably connected with the head shell through a head fixing bolt, the other end of the shell body is detachably connected with the tail shell through a tail fixing bolt, one end of the head shell is provided with an annular head sealing groove, one end of the tail shell is provided with an annular tail sealing groove, the shell body and the tail shell are sealed at the tail sealing groove through a tail sealing ring, the shell body and the head shell are sealed at the head sealing groove through the head sealing ring, a data acquisition card is detachably connected in the tail shell, the tail shell is in threaded fit with a waterproof joint, the waterproof joint is hollow, and a light guide column is arranged on the data acquisition card;
the head shell is hollow at two ends, an electrode fixing block is arranged at the hollow part of one end, the outer side of the end part is in threaded fit with the protective cap, and a pH electrode or an oxygen dissolving electrode is arranged at the inner side of the shell body, the head shell and the electrode fixing block.
When the inner side of the shell body, the head shell and the electrode fixing block is provided with the pH electrode, the electrode fixing block is a pH electrode fixing block, the pH electrode fixing block is clamped at the hollow part of the end part of the head shell, the pH electrode fixing block internally penetrates through a pH temperature sensor and a pH bulb, the end part of the pH electrode is provided with a sealing film, the pH electrode fixing block and the sealing film are internally provided with pH additive liquid, and the pH temperature sensor and the pH bulb are respectively connected with a data acquisition card through two wires.
When the dissolved oxygen electrode is arranged on the inner side of the shell body, the head shell and the electrode fixing block, the electrode fixing block is a dissolved oxygen electrode fixing block, the dissolved oxygen electrode fixing block is clamped in the hollow part of the end part of the head shell and stretches out of the head shell, the stretching end of the dissolved oxygen electrode fixing block is connected with the dissolved oxygen membrane head through threads, the dissolved oxygen electrode fixing block penetrates through the dissolved oxygen temperature sensor and the dissolved oxygen probe, and dissolved oxygen additive liquid is arranged in the dissolved oxygen electrode fixing block and the dissolved oxygen membrane head.
The number of the tail sealing grooves is two, planes of the two tail sealing grooves are parallel to each other, the number of the head sealing grooves is two, planes of the two head sealing grooves are parallel to each other, and the number of the tail fixing bolts and the number of the head fixing bolts are two respectively and are located on two radial sides of the shell body.
The pH electrode interface of the data acquisition card is connected with a pH voltage conversion circuit, the pH voltage conversion circuit is connected with an analog-to-digital converter, the analog-to-digital converter is respectively connected with a dissolved oxygen voltage conversion circuit, a temperature voltage conversion circuit and a singlechip, the singlechip is connected with an RS485 converter, and the dissolved oxygen voltage conversion circuit is connected with an dissolved oxygen electrode interface;
the pH electrode interface is connected with a pH electrode or the dissolved oxygen electrode interface is connected with a dissolved oxygen electrode;
the pH electrode interface, the pH voltage conversion circuit, the dissolved oxygen electrode interface, the dissolved oxygen voltage conversion circuit, the temperature voltage conversion circuit, the analog-to-digital converter, the singlechip and the RS485 converter are integrated into a whole.
The analog-digital converter is connected with the singlechip, the TX interface of the singlechip is connected with the 1 st interface of the RS485 converter, the RX interface of the singlechip is connected with the 4 th interface of the RS485 converter, the EN interface of the singlechip is respectively connected with the 2 nd interface and the 3 rd interface of the RS485 converter, the 6 th interface of the RS485 converter is connected with the 2 nd interface of the connector CN1, and the 7 th interface of the RS485 converter is connected with the 1 st interface of the connector CN 1.
The pH electrode interface is connected to pH voltage conversion circuit's resistance R4 one end, and amplifier U1's 3 rd interface, electric capacity C1 are connected respectively to the other end, electric capacity C1 ground connection, amplifier U1's 1 st interface is connected respectively to amplifier U1's 2 nd interface and resistance R3, resistance R3 is connected resistance R1, electric capacity C2, amplifier U2's 3 rd interface respectively, VREF1 interface is connected to resistance R1, electric capacity C2 ground connection, amplifier U2's 1 st interface is connected respectively to amplifier U2's 2 nd interface and resistance R2, electric capacity C3 and analog-to-digital converter U5's 1 st interface are connected respectively to resistance R2, electric capacity C3 ground connection.
The 2 nd interface of the amplifier U3 of the dissolved oxygen voltage conversion circuit is respectively connected with the dissolved oxygen electrode interface, the capacitor C4 and the resistor R5 are respectively connected with the 1 st interface of the amplifier U3 and the resistor R7 after being connected, the 3 rd interface of the amplifier U3 is respectively connected with the capacitor C5, the resistor R10, the resistor R9 and the 1 st interface of the amplifier U8, the capacitor C5 and the resistor R10 are respectively connected with the 2 nd interface of the amplifier U8 and the VREF2 interface after being connected, the 3 rd interface of the amplifier U8 is grounded, the resistor R9 is respectively connected with the 3 rd interface of the resistor R11 and the amplifier U4, the resistor R11 is grounded, the resistor R7 is respectively connected with the 2 nd interface of the amplifier U4 and the resistor R6 is respectively connected with the 1 st interface of the amplifier U8 and the 1 st interface of the amplifier U4, the resistor R8 is respectively connected with the capacitor C6 and the 2 nd interface of the analog-digital converter U5, and the capacitor C6 is grounded.
The temperature voltage conversion circuit is characterized in that a resistor R12 of the temperature voltage conversion circuit is respectively connected with a thermistor RT and a VREF3 interface, the thermistor RT is grounded, a capacitor C7 and a 3 rd interface of an amplifier U9 are respectively connected between the thermistor RT and the resistor R12, the capacitor C7 is grounded, a 1 st interface of the amplifier U9 is respectively connected with a 2 nd interface of the amplifier U9 and a resistor R13, the resistor R13 is respectively connected with a capacitor C8 and a 3 rd interface of an analog-to-digital converter U5, and the capacitor C8 is grounded.
The RS485 converter is U7, the analog-to-digital converter is U5, and the singlechip is U6;
the analog-to-digital converter is ADS1115 and is provided with at least three input ports;
the VREFO interface of the singlechip is respectively connected with the VREF1 interface of the pH voltage conversion circuit, the VREF2 interface of the dissolved oxygen voltage conversion circuit and the VREF3 interface of the temperature voltage conversion circuit, the singlechip, the RS485 converter, U1 and U2 of the pH voltage conversion circuit, U3, U4 and U8 of the dissolved oxygen voltage conversion circuit and U9 of the temperature voltage conversion circuit are respectively connected with an external power supply;
the voltage of the power supply is 3.3V.
The invention discloses a device for collecting data, which comprises a shell body, wherein a head shell and a tail shell are respectively arranged at two ends of the shell body, the shell body is a hollow circular ring, one end of the shell body is detachably connected with the head shell through a head fixing bolt, the other end of the shell body is detachably connected with the tail shell through a tail fixing bolt, one end of the head shell is provided with an annular head sealing groove, one end of the tail shell is provided with an annular tail sealing groove, the shell body and the tail shell are sealed at the tail sealing groove through a tail sealing ring, the shell body and the head shell are sealed at the head sealing groove through the head sealing ring, a data collecting card is detachably connected in the tail shell, the tail shell is in threaded fit with a waterproof joint, the waterproof joint is hollow, and a light guide column is arranged on the data collecting card; the two ends of the head shell are hollow, an electrode fixing block is arranged at the hollow part of one end, the outer side of the end part is in threaded fit with the protective cap, and a pH electrode or an oxygen dissolving electrode is arranged on the inner side of the shell, the head shell and the electrode fixing block. The invention has simple structure, convenient maintenance and replacement, realizes the purpose of sensor function conversion by only replacing small parts, reduces the product mold opening cost and improves the utilization rate of single parts. When the data acquisition module is clamped on a connected instrument, the light guide column lights a green light, and when the data acquisition module is not connected, the light guide column lights a red light, so that the state visualization of the sensor end is realized.
Drawings
FIG. 1 is an exploded view of the present invention;
FIG. 2 is a cross-sectional view of a pH sensor of the present invention;
FIG. 3 is a cross-sectional view of the dissolved oxygen sensor of the present invention;
FIG. 4 is a schematic cross-sectional view of the tail housing and data acquisition card of the present invention;
FIG. 5 is a schematic diagram of a data acquisition card of the present invention;
FIG. 6 is a circuit diagram of a data acquisition card of the present invention;
FIG. 7 is a schematic diagram of the structure of the pH electrode interface and pH voltage conversion circuit of the present invention;
FIG. 8 is a schematic diagram of the structure of the dissolved oxygen electrode interface and the dissolved oxygen voltage conversion circuit of the present invention;
FIG. 9 is a schematic diagram of a temperature-voltage conversion circuit according to the present invention;
in the figure: 1. the device comprises a shell body, 2, a head shell, 3, a tail shell, 4, a data acquisition card, 5, a waterproof joint, 6, a light guide column, 7, an electrode fixing block, 8, a protective cap, 9, a pH electrode, 10, a dissolved oxygen electrode, 11, a tail sealing groove, 12, a tail sealing ring, 13, a tail fixing bolt, 14, a head sealing groove, 15, a head sealing ring, 16, a head fixing bolt, 17, a pH electrode fixing block, 18, a pH temperature sensor, 19, a pH bulb, 20, a pH additive liquid, 21, a sealing film, 22, a dissolved oxygen electrode fixing block, 23, a dissolved oxygen temperature sensor, 24, a dissolved oxygen film head, 25, a dissolved oxygen probe, 26, a dissolved oxygen additive liquid, 27, a pH electrode interface, 28, a pH voltage conversion circuit, 29, a dissolved oxygen electrode interface, 30, a dissolved oxygen voltage conversion circuit, 31, a temperature voltage conversion circuit, 32, an analog-to-digital converter, 33, a singlechip, 34 and an RS485 converter.
Detailed Description
The invention is further described below with reference to the drawings and specific examples.
A split sensor for pH and dissolved oxygen comprising: the shell comprises a shell body 1, wherein a head shell 2 and a tail shell 3 are respectively arranged at two ends of the shell body 1, the shell body 1 is a hollow circular ring, one end of the shell body 1 is detachably connected with the head shell 2 through a head fixing bolt 16, the other end of the shell body is detachably connected with the tail shell 3 through a tail fixing bolt 13, one end of the head shell 2 is provided with an annular head sealing groove 14, one end of the tail shell 3 is provided with an annular tail sealing groove 11, the shell body 1 and the tail shell 3 are sealed at the tail sealing groove 11 through a tail sealing ring 12, the shell body 1 and the head shell 2 are sealed at the head sealing groove 14 through a head sealing ring 15, a data acquisition card 4 is detachably connected in the tail shell 3, the tail shell 3 is in threaded fit with a waterproof joint 5, the waterproof joint 5 is hollow, and a light guide column 6 is arranged on the data acquisition card 4; the two ends of the head shell 2 are hollow, an electrode fixing block 7 is arranged at the hollow part of one end, the outer side of the end is in threaded fit with a protective cap 8, and a pH electrode 9 or an oxygen dissolving electrode 10 is arranged on the inner sides of the shell 1, the head shell 2 and the electrode fixing block 7.
When the inner sides of the shell body 1, the head shell 2 and the electrode fixing block 7 are provided with the pH electrode 9, the electrode fixing block 7 is a pH electrode fixing block 17, the pH electrode fixing block 17 is clamped at the hollow part of the end part of the head shell 2, the pH electrode fixing block 17 passes through a pH temperature sensor 18 and a pH bulb 19, the end part of the pH electrode 9 is provided with a sealing film 21, the pH electrode 9, the pH electrode fixing block 17 and the sealing film 21 are internally provided with a pH additive liquid 20, and the pH temperature sensor 18 and the pH bulb 19 are respectively connected with the data acquisition card 4 through two wires.
When the dissolved oxygen electrode 10 is arranged on the inner sides of the shell body 1, the head shell 2 and the electrode fixing block 7, the electrode fixing block 7 is a dissolved oxygen electrode fixing block 22, the dissolved oxygen electrode fixing block 22 is clamped at the hollow part of the end part of the head shell 2 and extends out of the head shell 2, the extending end of the dissolved oxygen electrode fixing block 22 is connected with the dissolved oxygen membrane head 24 through threads, the dissolved oxygen temperature sensor 23 and the dissolved oxygen probe 25 penetrate through the dissolved oxygen electrode fixing block 22, and the dissolved oxygen adding liquid 26 is arranged in the dissolved oxygen electrode fixing block 22 and the dissolved oxygen membrane head 24.
The number of the tail seal grooves 11 is two, planes of the two tail seal grooves 11 are parallel to each other, the number of the head seal grooves 14 is two, planes of the two head seal grooves 14 are parallel to each other, and the number of the tail fixing bolts 13 and the head fixing bolts 16 are two respectively and are respectively positioned on two radial sides of the shell body 1.
The pH electrode interface 27 of the data acquisition card 4 is connected with the pH voltage conversion circuit 28, the pH voltage conversion circuit 28 is connected with the analog-to-digital converter 32, the analog-to-digital converter 32 is respectively connected with the dissolved oxygen voltage conversion circuit 30, the temperature voltage conversion circuit 31 and the singlechip 33, the singlechip 33 is connected with the RS485 converter 34, and the dissolved oxygen voltage conversion circuit 30 is connected with the dissolved oxygen electrode interface 29; the pH electrode interface 27 is connected with a pH electrode or the dissolved oxygen electrode interface 29 is connected with a dissolved oxygen electrode; the pH electrode interface 27, the pH voltage conversion circuit 28, the dissolved oxygen electrode interface 29, the dissolved oxygen voltage conversion circuit 30, the temperature voltage conversion circuit 31, the analog-to-digital converter 32, the singlechip 33 and the RS485 converter 34 are integrated into a whole.
The analog-digital converter 32 is connected with the singlechip 33, the TX interface of the singlechip 33 is connected with the 1 st interface of the RS485 converter 34, the RX interface of the singlechip 33 is connected with the 4 th interface of the RS485 converter 34, the EN interface of the singlechip 33 is respectively connected with the 2 nd interface and the 3 rd interface of the RS485 converter 34, the 6 th interface of the RS485 converter 34 is connected with the 2 nd interface of the connector CN1, and the 7 th interface of the RS485 converter 34 is connected with the 1 st interface of the connector CN 1.
The pH electrode interface 27 is connected to the resistance R4 one end of pH voltage conversion circuit 28, the other end is connected the 3 rd interface of amplifier U1 respectively, electric capacity C1 ground connection, the 1 st interface of amplifier U1 is connected the 2 nd interface of amplifier U1 respectively and resistance R3, resistance R3 is connected the 3 rd interface of resistance R1, electric capacity C2, amplifier U2 respectively, VREF1 interface is connected to resistance R1, electric capacity C2 ground connection, the 1 st interface of amplifier U2 is connected the 2 nd interface of amplifier U2 respectively and resistance R2, electric capacity C3 and analog to digital converter U5's 1 interface are connected respectively to resistance R2, electric capacity C3 ground connection.
The 2 nd interface of the amplifier U3 of the dissolved oxygen voltage conversion circuit 30 is respectively connected with the dissolved oxygen electrode interface 29, the capacitor C4 and the resistor R5 are respectively connected with the 1 st interface of the amplifier U3 and the resistor R7 after being connected, the 3 rd interface of the amplifier U3 is respectively connected with the capacitor C5, the resistor R10, the resistor R9 and the 1 st interface of the amplifier U8, the capacitor C5 and the resistor R10 are respectively connected with the 2 nd interface of the amplifier U8 and the VREF2 interface after being connected, the 3 rd interface of the amplifier U8 is grounded, the resistor R9 is respectively connected with the 3 rd interface of the amplifier U4 and the resistor R11 is grounded, the resistor R7 is respectively connected with the 2 nd interface of the amplifier U4 and the resistor R6, the resistor R6 is respectively connected with the 1 st interface of the amplifier U4, the resistor R8 is respectively connected with the capacitor C6 and the 2 nd interface of the analog-digital converter U5, and the capacitor C6 is grounded.
The resistor R12 of the temperature-voltage conversion circuit 31 is respectively connected with the interfaces of the thermistor RT and VREF3, the thermistor RT is grounded, the capacitor C7 and the 3 rd interface of the amplifier U9 are respectively connected between the thermistor RT and the resistor R12, the capacitor C7 is grounded, the 1 st interface of the amplifier U9 is respectively connected with the 2 nd interface of the amplifier U9 and the resistor R13, the resistor R13 is respectively connected with the capacitor C8 and the 3 rd interface of the analog-digital converter U5, and the capacitor C8 is grounded.
The RS485 converter 34 is U7, the analog-digital converter 32 is U5, and the singlechip 33 is U6; the analog-to-digital converter 32 is an ADS1115, and has at least three input ports; the VREFO interface of the singlechip 33 is respectively connected with the VREF1 interface of the pH voltage conversion circuit 28, the VREF2 interface of the dissolved oxygen voltage conversion circuit 30 and the VREF3 interface of the temperature voltage conversion circuit 31, the singlechip 33, the RS485 converter 34, U1 and U2 of the pH voltage conversion circuit 28, U3, U4 and U8 of the dissolved oxygen voltage conversion circuit 30 and U9 of the temperature voltage conversion circuit 31 are respectively connected with an external power supply; the voltage of the power supply is 3.3V.
The dissolved oxygen sensor and the pH sensor adopt the same shell body 1, a head shell 2, a tail shell 3, a waterproof joint 5, a light guide column 6, a tail sealing groove 11, a tail sealing ring 12, a tail fixing bolt 13, a head sealing groove 14, a head sealing ring 15 and a head fixing bolt 16, and the difference is that the electrode fixing block 7 and the protective cap 8 and the pH electrode 9 or the dissolved oxygen electrode 10 are arranged in the electrode fixing block 7 and the protective cap 8, and the electrode fixing block 7 is sealed at the head shell 2 through glue. When the pH electrode 9 or the dissolved oxygen electrode 10 is damaged, the protection cap 8 and the head fixing bolt 16 are sequentially removed, and then the electrode fixing block 7 and the pH electrode 9 or the dissolved oxygen electrode 10 are removed, so that the replacement can be realized. The sensor is updated only by replacing the head of the shell, so that the cost is greatly saved.
The dotted line part is a communication line, and connects the sensor probe part with the data acquisition card 4. The data acquisition card 4 is internally provided with a signal sensing device, the current sensor type can be judged through the difference of acquisition signals, the data are processed, the sent analog signals are converted into digital signals, and the digital signals are transmitted to a rear-mounted device such as a display device through a cable. Because the data acquisition modules used by the different types of sensors are the same, split type replacement is more convenient, only the head part of the shell is replaced, and the tail part of the shell with the data acquisition card 4 does not need to be replaced. When in replacement, the self-tapping screw on the head shell 2, namely the head fixing bolt 16, is unscrewed firstly, the head shell 2 with the accessory is taken out entirely, the communication line between the electrode fixing block 7 and the data acquisition card 4 is pulled out, then a new accessory is replaced, the communication line is connected again, and then the head fixing bolt 16 is unscrewed again for fixation.
The data acquisition module card 4 adopts a slot type installation mode, so that the installation mode of using screws is avoided, and the installation flow is simplified. The LED lamp on the data acquisition module card 4 just aims at the light guide column 6, the light guide rod is fixed in the light guide column 6, the LED lamp is lighted and can conduct light to the outside, when the sensor is successful in communication with the instrument, the light guide column 6 is lighted to be green, when the sensor is unsuccessful in electrification, the light guide column is lighted to be red, the real-time state of the sensor can be conveniently known, and the visualization of the state of the sensor is enhanced. The purpose of sensor function conversion is realized by only replacing a small part of accessories, the product die sinking cost is reduced, and the utilization rate of a single accessory is improved.
The principle of pH is similar to that of dissolved oxygen, and the data acquisition of the pH electrode and the dissolved oxygen electrode are integrated, so that the cost can be reduced, and the pH electrode and the dissolved oxygen electrode can be independently used, and the standardization rate is improved.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A split sensor for use with pH and dissolved oxygen comprising:
the shell comprises a shell body (1), wherein a head shell (2) and a tail shell (3) are respectively arranged at two ends of the shell body (1), the shell body (1) is a hollow circular ring, one end of the shell body (1) is detachably connected with the head shell (2) through a head fixing bolt (16), the other end of the shell body is detachably connected with the tail shell (3) through a tail fixing bolt (13), one end of the head shell (2) is provided with an annular head sealing groove (14), one end of the tail shell (3) is provided with an annular tail sealing groove (11), the shell body (1) and the tail shell (3) are sealed at the tail sealing groove (11) through a tail sealing ring (12), the shell body (1) and the head shell (2) are sealed at the head sealing groove (14) through a head sealing ring (15), a data acquisition card (4) is detachably connected in the tail shell (3) and the tail shell (5) in a threaded fit manner, the waterproof joint (5) is hollow, and a light guide column (6) is arranged on the data acquisition card (4).
The two ends of the head shell (2) are hollow, an electrode fixing block (7) is arranged at the hollow part of one end, the outer side of the end is in threaded fit with a protective cap (8), and a pH electrode (9) or an oxygen dissolving electrode (10) is arranged at the inner sides of the shell body (1), the head shell (2) and the electrode fixing block (7);
one of a pH electrode (9) and an oxygen dissolving electrode (10) is arranged on the inner sides of the shell body (1), the head shell (2) and the electrode fixing block (7);
when the inner sides of the shell body (1), the head shell (2) and the electrode fixing block (7) are provided with the pH electrode (9), the electrode fixing block (7) is a pH electrode fixing block (17), the pH electrode fixing block (17) is clamped at the hollow part of the end part of the head shell (2), the pH electrode fixing block (17) passes through a pH temperature sensor (18) and a pH bulb (19), the end part of the pH electrode (9) is provided with a sealing film (21), the pH electrode (9), the pH electrode fixing block (17) and the sealing film (21) are internally provided with a pH additive liquid (20), and the pH temperature sensor (18) and the pH bulb (19) are respectively connected with the data acquisition card (4) through two wires;
when the dissolved oxygen electrode (10) is arranged on the inner side of the shell body (1), the head shell (2) and the electrode fixing block (7), the electrode fixing block (7) is a dissolved oxygen electrode fixing block (22), the dissolved oxygen electrode fixing block (22) is clamped at the hollow part of the end part of the head shell (2) and stretches out of the head shell (2), the stretching-out end of the dissolved oxygen electrode fixing block (22) is connected with the dissolved oxygen membrane head (24) through threads, the dissolved oxygen electrode fixing block (22) passes through the dissolved oxygen temperature sensor (23) and the dissolved oxygen probe (25), and dissolved oxygen additive liquid (26) is arranged in the dissolved oxygen electrode fixing block (22) and the dissolved oxygen membrane head (24).
2. The split type sensor for the common use of the pH and the dissolved oxygen according to claim 1, wherein the number of the tail seal grooves (11) is two, the planes of the two tail seal grooves (11) are parallel to each other, the number of the head seal grooves (14) is two, the planes of the two head seal grooves (14) are parallel to each other, and the number of the tail fixing bolts (13) and the head fixing bolts (16) are two, and are respectively positioned at two radial sides of the shell body (1).
3. The split type sensor for the common use of the pH value and the dissolved oxygen according to claim 1, wherein a pH electrode interface (27) of the data acquisition card (4) is connected with a pH voltage conversion circuit (28), the pH voltage conversion circuit (28) is connected with an analog-to-digital converter (32), the analog-to-digital converter (32) is respectively connected with a dissolved oxygen voltage conversion circuit (30), a temperature voltage conversion circuit (31) and a singlechip (33), the singlechip (33) is connected with an RS485 converter (34), and the dissolved oxygen voltage conversion circuit (30) is connected with a dissolved oxygen electrode interface (29);
the pH electrode interface (27) is connected with a pH electrode or the dissolved oxygen electrode interface (29) is connected with a dissolved oxygen electrode;
the pH electrode interface (27), the pH voltage conversion circuit (28), the dissolved oxygen electrode interface (29), the dissolved oxygen voltage conversion circuit (30), the temperature voltage conversion circuit (31), the analog-to-digital converter (32), the singlechip (33) and the RS485 converter (34) are integrated into a whole.
4. A split type sensor for pH and dissolved oxygen, according to claim 3, wherein the analog-digital converter (32) is connected with the single chip microcomputer (33), the TX interface of the single chip microcomputer (33) is connected with the 1 st interface of the RS485 converter (34), the RX interface of the single chip microcomputer (33) is connected with the 4 th interface of the RS485 converter (34), the EN interface of the single chip microcomputer (33) is respectively connected with the 2 nd interface and the 3 rd interface of the RS485 converter (34), the 6 th interface of the RS485 converter (34) is connected with the 2 nd interface of the joint CN1, and the 7 th interface of the RS485 converter (34) is connected with the 1 st interface of the joint CN 1.
5. A split type sensor for pH and dissolved oxygen according to claim 3, wherein one end of a resistor R4 of the pH voltage conversion circuit (28) is connected to the pH electrode interface (27), the other end is connected to the 3 rd interface of the amplifier U1 and the capacitor C1, the capacitor C1 is grounded, the 1 st interface of the amplifier U1 is connected to the 2 nd interface of the amplifier U1 and the resistor R3, the resistor R3 is connected to the resistor R1, the capacitor C2 and the 3 rd interface of the amplifier U2, the resistor R1 is connected to the VREF1 interface, the capacitor C2 is grounded, the 1 st interface of the amplifier U2 is connected to the 2 nd interface of the amplifier U2 and the resistor R2, the resistor R2 is connected to the capacitor C3 and the 1 st interface of the analog-to-digital converter U5, and the capacitor C3 is grounded.
6. The split type sensor for pH and dissolved oxygen, as set forth in claim 3, wherein the 2 nd interface of the amplifier U3 of the dissolved oxygen voltage conversion circuit (30) is connected to the dissolved oxygen electrode interface (29), the capacitor C4 and the resistor R5, the 1 st interface of the amplifier U3 and the resistor R7 are connected after the connection of the capacitor C4 and the resistor R5, the 3 rd interface of the amplifier U3 is connected to the capacitor C5, the resistor R10, the resistor R9 and the 1 st interface of the amplifier U8, the 2 nd interface of the amplifier U8 and the VREF2 interface are connected after the connection of the capacitor C5 and the resistor R10, the 3 rd interface of the amplifier U8 is grounded, the resistor R9 is connected to the 2 nd interface of the amplifier U4, the resistor R6 is connected to the resistor R11 and the ground, the resistor R7 is connected to the 2 nd interface of the amplifier U4, the resistor R6 is connected to the 1 st interface of the amplifier U8, the resistor R8 is connected to the capacitor C6 and the analog to the capacitor C2 nd interface of the amplifier U5 is grounded.
7. A split type sensor for pH and dissolved oxygen according to claim 3, wherein the resistor R12 of the temperature-voltage conversion circuit (31) is connected to the interfaces of the thermistor RT and VREF3 respectively, the thermistor RT is grounded, the capacitor C7 and the 3 rd interface of the amplifier U9 are connected between the thermistor RT and the resistor R12 respectively, the capacitor C7 is grounded, the 1 st interface of the amplifier U9 is connected to the 2 nd interface of the amplifier U9 and the resistor R13 respectively, the resistor R13 is connected to the capacitor C8 and the 3 rd interface of the analog-digital converter U5 respectively, and the capacitor C8 is grounded.
8. A split type sensor for pH and dissolved oxygen according to claim 3, wherein the RS485 converter (34) is U7, the analog-to-digital converter (32) is U5, and the single chip microcomputer (33) is U6;
the analog-to-digital converter (32) is an ADS1115 and has at least three input ports;
the VREF0 interface of the singlechip (33) is respectively connected with the VREF1 interface of the pH voltage conversion circuit (28), the VREF2 interface of the dissolved oxygen voltage conversion circuit (30) and the VREF3 interface of the temperature voltage conversion circuit (31), the singlechip (33), the RS485 converter (34), the U1 and the U2 of the pH voltage conversion circuit (28), the U3, the U4 and the U8 of the dissolved oxygen voltage conversion circuit (30) and the U9 of the temperature voltage conversion circuit (31) are respectively connected with an external power supply;
the voltage of the power supply is 3.3V.
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