CN114813865A - Split type sensor universal for pH and dissolved oxygen - Google Patents
Split type sensor universal for pH and dissolved oxygen Download PDFInfo
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- CN114813865A CN114813865A CN202210322639.6A CN202210322639A CN114813865A CN 114813865 A CN114813865 A CN 114813865A CN 202210322639 A CN202210322639 A CN 202210322639A CN 114813865 A CN114813865 A CN 114813865A
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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
- 238000007789 sealing Methods 0.000 claims abstract description 53
- 238000006243 chemical reaction Methods 0.000 claims description 61
- 239000003990 capacitor Substances 0.000 claims description 44
- 230000001681 protective effect Effects 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 5
- 238000004891 communication Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012800 visualization Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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 general 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, is convenient to overhaul and replace, realizes the purpose of converting the functions of the sensor only by replacing a small part of accessories, reduces the die sinking cost of products and improves the utilization rate of single accessories.
Description
Technical Field
The invention relates to the technical field of sensor equipment, in particular to a general pH and dissolved oxygen split type sensor which has a simple structure, is convenient to overhaul and replace, realizes the purpose of converting the functions of the sensor only by replacing a small part of accessories, reduces the die sinking cost of a product, and improves the utilization rate of a single accessory.
Background
The intelligent sensor is also called as a digital sensor, and converts acquired analog signals into digital signals through a built-in data acquisition module, and the digital sensor generally achieves the purpose of measuring different types of data according to different measuring accessories. The existing intelligent sensor is basically measured by adopting integral injection molding and adding accessories, so the type of measured data limits the use occasions of the sensor shell, different functions cannot be realized by replacing a small number of parts even if a split type sensor is provided, in the manufacturing process, the whole mould is opened again when the functions are replaced, and the cost is higher and is not cost-effective; meanwhile, when the sensors of the same type at the present stage transmit information with the instrument, if the communication fails, the problem of the instrument or the problem of the electrode cannot be inquired, and the overhaul is complicated.
The electrode life in the sensor is short, and the electrode life generally is a year, and the data acquisition module in the sensor is longe-lived, if to the sensor, if the electrode damage back is whole change promptly, can cause very big waste. The pH sensor and the dissolved oxygen sensor have similar working principles, and can integrate the data acquisition functions of the pH sensor and the dissolved oxygen sensor together, thereby improving the production efficiency and realizing the two functions on one sensor.
The utility model provides a simple structure, convenient maintenance and change, only change the purpose that the sensor function conversion just realized to the small part accessory, reduced 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 general split type sensor for pH and dissolved oxygen, which has the advantages of simple structure, convenience in overhaul and replacement, capability of realizing the function conversion of the sensor only by replacing a small part of accessories, reduction in the die sinking cost of a product, and improvement in the utilization rate of a single accessory.
A split sensor for both pH and dissolved oxygen applications, comprising:
the shell 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, an annular head sealing groove is arranged at one end of the head shell, an annular tail sealing groove is arranged at one end of the tail shell, 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 two ends of the head shell are hollow, an electrode fixing block is arranged at the hollow position 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 sides of the shell, the head shell and the electrode fixing block.
When the pH electrodes are arranged on the inner sides of the shell, the head shell and the electrode fixing block, 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, a pH temperature sensor and a pH bulb are penetrated through the pH electrode fixing block, a sealing rubber sheet is arranged at the end part of the pH electrode, a pH adding liquid is arranged in the pH electrode, the pH electrode fixing block and the sealing rubber sheet, and the pH temperature sensor and the pH bulb are respectively connected with a data acquisition card through two wires.
When shell casing, head shell, electrode fixed block inboard set up dissolved oxygen electrode, the electrode fixed block is dissolved oxygen electrode fixed block, dissolved oxygen electrode fixed block card is in the tip cavity department of head shell to stretch out the head shell, the end that stretches out of dissolved oxygen electrode fixed block passes through threaded connection dissolved oxygen membrane head, pass dissolved oxygen temperature sensor and dissolved oxygen probe in the dissolved oxygen electrode fixed block, dissolved oxygen electrode fixed block sets up the dissolved oxygen addition liquid with dissolved oxygen membrane head.
The quantity of afterbody seal groove is two, and two afterbody seal grooves place the plane parallel to each other, the quantity of head seal groove is two, and two head seal groove place planes parallel to each other, the quantity of afterbody fixing bolt and head fixing bolt is two respectively, is located the radial both sides of shell body respectively.
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 single chip microcomputer, the single chip microcomputer is connected with an RS485 converter, and the dissolved oxygen voltage conversion circuit is connected with a 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 single chip microcomputer and the RS485 converter are integrated into a whole.
The analog-to-digital converter is connected with the single chip microcomputer, a TX interface of the single chip microcomputer is connected with a 1 st interface of the RS485 converter, an RX interface of the single chip microcomputer is connected with a 4 th interface of the RS485 converter, an EN interface of the single chip microcomputer is respectively connected with a 2 nd interface and a 3 rd interface of the RS485 converter, a 6 th interface of the RS485 converter is connected with a 2 nd interface of the connector CN1, and a 7 th interface of the RS485 converter is connected with a 1 st interface of the connector CN 1.
The pH voltage conversion circuit is characterized in that one end of a resistor R4 of the pH voltage conversion circuit is connected with a pH electrode interface, the other end of the resistor R4 is connected with a No. 3 interface and a capacitor C1 of an amplifier U1 respectively, the capacitor C1 is grounded, a No. 1 interface of the amplifier U1 is connected with a No. 2 interface and a resistor R3 of an amplifier U1 respectively, the resistor R3 is connected with a No. 3 interface of a resistor R1, a capacitor C2 and an amplifier U2 respectively, the resistor R1 is connected with a VREF1 interface, the capacitor C2 is grounded, a No. 1 interface of the amplifier U2 is connected with a No. 2 interface and a resistor R2 of the amplifier U2 respectively, the resistor R2 is connected with a No. 1 interface of a capacitor C3 and an analog-to-digital converter U5 respectively, and the capacitor C3 is grounded.
The No. 2 interface of the amplifier U3 of the dissolved oxygen voltage conversion circuit is respectively connected with an dissolved oxygen electrode interface, a capacitor C4 and a resistor R5, 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 No. 3 interface of the amplifier U3 is respectively connected with the No. 1 interfaces of a capacitor C5, a resistor R10, a resistor R9 and an 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 resistor R11 and the 3 rd interface of the amplifier U4, the resistor R11 is grounded, the resistor R7 is respectively connected with the No. 2 interface of the amplifier U4 and the resistor R6, the resistor R6 is respectively connected with the resistor R8 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-to-digital converter U5, and the capacitor C6 is grounded.
Thermistor RT, VREF3 interface are connected respectively to temperature voltage conversion circuit's resistance R12, thermistor RT ground connection, connect electric capacity C7, amplifier U9's 3 rd interface between thermistor RT and the resistance R12 respectively, electric capacity C7 ground connection, amplifier U9's 1 st interface connects amplifier U9's 2 nd interface, resistance R13 respectively, electric capacity C8, analog-to-digital converter U5's 3 rd interface is connected respectively to resistance R13, electric capacity C8 ground connection.
The RS485 converter is U7, the analog-to-digital converter is U5, and the singlechip is U6;
the analog-to-digital converter is an ADS1115 and is provided with at least three input ports;
the VREFO interface of the single chip microcomputer is respectively connected with a VREF1 interface of the pH voltage conversion circuit, a VREF2 interface of the dissolved oxygen voltage conversion circuit and a VREF3 interface of the temperature voltage conversion circuit, the single chip microcomputer, 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 two ends of a shell are respectively provided with a head shell and a tail 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 two ends of the head shell are hollow, the hollow part at one end is provided with an electrode fixing block, the outer side of the end part is in threaded fit with the protective cap, and the inner sides of the shell, the head shell and the electrode fixing block are provided with a pH electrode or an oxygen dissolving electrode. The invention has simple structure, is convenient to overhaul and replace, realizes the purpose of converting the functions of the sensor only by replacing a small part of accessories, reduces the die sinking cost of products and improves the utilization rate of single accessories. Let the data acquisition module card when connecting the instrument, the bright green lamp of leaded light post, when not connecting, the bright red lamp of leaded light post to this state visualization who realizes the sensor end.
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 a 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 the structure of a data acquisition card according to the present invention;
FIG. 6 is a circuit diagram of a data acquisition card in accordance with the present invention;
FIG. 7 is a schematic diagram of the structure of the pH electrode interface and the 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 the temperature-voltage conversion circuit of the present invention;
in the figure: 1. 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 adding liquid, 21, a sealing, 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 adding 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 and an analog-to-digital converter, 33. single chip computer, 34, RS485 converter.
Detailed Description
The invention is further described below with reference to the following figures and specific examples.
A split sensor for both pH and dissolved oxygen applications, comprising: the portable data acquisition device 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 data 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 at one end, the outer side of the end part 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 body 1, the head shell 2 and the electrode fixing block 7.
When the pH electrode 9 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 pH electrode fixing block 17, the pH electrode fixing block 17 is clamped in the hollow part of the end part of the head shell 2, a pH temperature sensor 18 and a pH bulb 19 penetrate through the pH electrode fixing block 17, a sealing film 21 is arranged on the end part of the pH electrode 9, a pH adding liquid 20 is arranged in the pH electrode 9, the pH electrode fixing block 17 and the sealing film 21, and the pH temperature sensor 18 and the pH bulb 19 are respectively connected with the data acquisition card 4 through two leads.
When shell body 1, head shell 2, electrode fixed block 7 inboard set up dissolved oxygen electrode 10, electrode fixed block 7 is dissolved oxygen electrode fixed block 22, dissolved oxygen electrode fixed block 22 card is in the tip cavity department of head shell 2, and stretch out head shell 2, the end that stretches out of dissolved oxygen electrode fixed block 22 passes through threaded connection dissolved oxygen membrane head 24, pass dissolved oxygen temperature sensor 23 and dissolved oxygen probe 25 in the dissolved oxygen electrode fixed block 22, set up dissolved oxygen additive solution 26 in dissolved oxygen electrode fixed block 22 and the dissolved oxygen membrane head 24.
The number of the tail sealing grooves 11 is two, the planes of the two tail sealing grooves 11 are parallel to each other, the number of the head sealing grooves 14 is two, the planes of the two head sealing grooves 14 are parallel to each other, and the number of the tail fixing bolts 13 is two, and the number of the head fixing bolts 16 is two, and the tail fixing bolts 13 are located on the two radial sides of the shell body 1 respectively.
The 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 single chip microcomputer 33, the single chip microcomputer 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.
The analog-to-digital converter 32 is connected with the single chip microcomputer 33, a TX interface of the single chip microcomputer 33 is connected with a 1 st interface of the RS485 converter 34, an RX interface of the single chip microcomputer 33 is connected with a 4 th interface of the RS485 converter 34, an EN interface of the single chip microcomputer 33 is respectively connected with a 2 nd interface and a 3 rd interface of the RS485 converter 34, a 6 th interface of the RS485 converter 34 is connected with a 2 nd interface of the connector CN1, and a 7 th interface of the RS485 converter 34 is connected with a 1 st interface of the connector CN 1.
One end of a resistor R4 of the pH voltage conversion circuit 28 is connected with the pH electrode interface 27, the other end of the resistor R4 is connected with a 3 rd interface of an amplifier U1 and a capacitor C1 respectively, the capacitor C1 is grounded, a 1 st interface of the amplifier U1 is connected with a 2 nd interface of an amplifier U1 and a resistor R3 respectively, a resistor R3 is connected with a 3 rd interface of a resistor R1, a capacitor C2 and an amplifier U2 respectively, a resistor R1 is connected with a VREF1 interface, the capacitor C2 is grounded, a 1 st interface of an amplifier U2 is connected with a 2 nd interface of the amplifier U2 and a resistor R2 respectively, a resistor R2 is connected with a 1 st interface of a capacitor C3 and an analog-to-digital converter U5 respectively, and a capacitor C3 is grounded.
A 2 nd interface of an 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, a capacitor C4 and a resistor R5 are connected to a 1 st interface of the amplifier U3 and the resistor R7, a 3 rd interface of the amplifier U7 is connected to the capacitor C7, the resistor R7 and a 1 st interface of the amplifier U7, the capacitor C7 and the resistor R7 are connected to a 2 nd interface of the amplifier U7 and a VREF 7 interface, a 3 rd interface of the amplifier U7 is grounded, the resistor R7 is connected to the resistor R7 and the 3 rd interface of the amplifier U7, the resistor R7 is grounded, the resistor R7 is connected to a 2 nd interface of the amplifier U7, the resistor R7 is connected to the resistor R7 and a 1 st interface of the amplifier U7, and the resistor R7 is connected to the capacitor C7, the analog-to-digital converter U7 and the capacitor C7.
The resistor R12 of the temperature-voltage conversion circuit 31 is respectively connected with the thermistor RT and the VREF3 interface, the thermistor RT is grounded, the thermistor RT and the resistor R12 are respectively connected with the 3 rd interface of the capacitor C7 and the amplifier U9, 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 3 rd interface of the capacitor C8 and the analog-to-digital converter U5, and the capacitor C8 is grounded.
The RS485 converter 34 is U7, the analog-to-digital converter 32 is U5, and the singlechip 33 is U6; the analog-to-digital converter 32 is an ADS1115 having at least three input ports; the VREFO interface of the single chip microcomputer 33 is respectively connected with a VREF1 interface of the pH voltage conversion circuit 28, a VREF2 interface of the dissolved oxygen voltage conversion circuit 30, a VREF3 interface of the temperature voltage conversion circuit 31, the single chip microcomputer 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 lies in that an electrode fixing block 7 and a protective cap 8, and whether a pH electrode 9 or a dissolved oxygen electrode 10 is 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, replacement can be realized only by sequentially removing the protective cap 8 and the head fixing bolt 16 and further removing the electrode fixing block 7 and the pH electrode 9 or the dissolved oxygen electrode 10. The sensor can be updated only by replacing the head of the shell, so that the cost is greatly saved.
The dotted line portion is a communication line connecting the sensor probe portion to the data acquisition card 4. The data acquisition card 4 is internally provided with a signal sensing device, can judge the current sensor type through the difference of the acquired signals, processes the data, converts the sent analog signals into digital signals, and transmits the digital signals to post devices such as a display device and the like through cables. Because the data acquisition modules used by different types of sensors are the same, the 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 the head shell is replaced, the fastening self-tapping screw on the head shell 2, namely the head fixing bolt 16, is firstly screwed off, the head shell 2 with the accessories is entirely taken out, the communication wire between the electrode fixing block 7 and the data acquisition card 4 is pulled out, then a new accessory is replaced, the communication wire is connected, and then the head fixing bolt 16 is screwed on again for fixing.
The data acquisition module card 4 adopts a slot type installation mode, so that the installation mode of screws is avoided, and the installation flow is simplified. The LED lamp on the data acquisition module card 4 just in time aims at leaded light post 6, and 6 internal fixation leaded light sticks of leaded light post, the LED lamp is bright just can conduct the light to the outside, and when sensor and instrument communication succeeded, the bright green lamp of leaded light post, when the sensor circular telegram was unsuccessful, the bright red lamp of leaded light post, the real-time status of understanding the sensor that just can be convenient, the visualization of sensor status has been strengthened. The purpose of function conversion of the sensor can be realized only by replacing a small part of accessories, the die sinking cost of the product 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 integration of the pH electrode and the dissolved oxygen electrode can reduce the cost and can be independently used at the same time, thereby improving the standardization rate.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A split type sensor for both pH and dissolved oxygen is characterized by 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), an annular head sealing groove (14) is formed in one end of the head shell (2), an annular tail sealing groove (11) is formed in one end of the tail shell (3), the shell body (1) and the tail shell (3) are sealed in the tail sealing groove (11) through a tail sealing ring (12), the shell body (1) and the head shell (2) are sealed in the head sealing groove (14) through a head sealing ring (15), and a data acquisition card (4) is detachably connected in the tail shell (3), the tail shell (3) is in threaded fit with the waterproof joint (5), the waterproof joint (5) is hollow, and the data acquisition card (4) is provided with a light guide column (6);
the both ends cavity of head shell (2), the cavity department of one end sets up electrode fixed block (7), tip outside and protective cap (8) screw-thread fit, shell casing (1), head shell (2), electrode fixed block (7) inboard sets up pH electrode (9) or dissolved oxygen electrode (10).
2. The split type sensor for general use of pH and dissolved oxygen according to claim 1, wherein when a pH electrode (9) is arranged on the inner sides of the shell (1), the head shell (2) and the electrode fixing block (7), 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), a pH temperature sensor (18) and a pH bulb (19) penetrate through the pH electrode fixing block (17), a sealing film (21) is arranged on the end part of the pH electrode (9), a pH adding liquid (20) is arranged in the pH electrode (9), the pH electrode fixing block (17) and the sealing film (21), and the pH temperature sensor (18) and the pH bulb (19) are respectively connected with the data acquisition card (4) through two wires.
3. The split type sensor for general use of pH and dissolved oxygen according to claim 1, wherein when the dissolved oxygen electrode (10) is disposed inside the housing (1), the head housing (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 housing (2) and extends out of the head housing (2), the extending end of the dissolved oxygen electrode fixing block (22) is connected with a dissolved oxygen membrane head (24) through a thread, the dissolved oxygen temperature sensor (23) and the dissolved oxygen probe (25) penetrate through the dissolved oxygen electrode fixing block (22), and a dissolved oxygen addition solution (26) is disposed in the dissolved oxygen electrode fixing block (22) and the dissolved oxygen membrane head (24).
4. The split type sensor for both pH and dissolved oxygen according to claim 1, wherein the number of the tail sealing grooves (11) is two, the planes of the two tail sealing grooves (11) are parallel to each other, the number of the head sealing grooves (14) is two, the planes of the two head sealing grooves (14) are parallel to each other, and the number of the tail fixing bolts (13) and the number of the head fixing bolts (16) are two respectively and are located on two radial sides of the housing case (1).
5. The split type sensor for both pH and dissolved oxygen according to claim 1, wherein the pH electrode interface (27) of the data acquisition card (4) is connected to a pH voltage conversion circuit (28), the pH voltage conversion circuit (28) is connected to an analog-to-digital converter (32), the analog-to-digital converter (32) is respectively connected to a dissolved oxygen voltage conversion circuit (30), a temperature voltage conversion circuit (31) and a single chip microcomputer (33), the single chip microcomputer (33) is connected to an RS485 converter (34), and the dissolved oxygen voltage conversion circuit (30) is connected to 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 single chip microcomputer (33) and the RS485 converter (34) are integrated into a whole.
6. The pH and dissolved oxygen data acquisition module according to claim 5, wherein the analog-to-digital converter (32) is connected with a single chip microcomputer (33), a TX interface of the single chip microcomputer (33) is connected with a 1 st interface of the RS485 converter (34), an RX interface of the single chip microcomputer (33) is connected with a 4 th interface of the RS485 converter (34), an EN interface of the single chip microcomputer (33) is respectively connected with a 2 nd interface and a 3 rd interface of the RS485 converter (34), a 6 th interface of the RS485 converter (34) is connected with a 2 nd interface of a connector CN1, and a 7 th interface of the RS485 converter (34) is connected with a 1 st interface of a connector CN 1.
7. The pH and dissolved oxygen data acquisition module according to claim 5, 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 of the resistor R4 is connected to the 3 rd interface of an amplifier U1 and a capacitor C1, the capacitor C1 is grounded, the 1 st interface of the amplifier U1 is connected to the 2 nd interface of an 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 1 st interface of the capacitor C3 and the analog-to-digital converter U5, and the capacitor C3 is grounded.
8. The pH and dissolved oxygen data acquisition module according to claim 5, 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, respectively, the capacitor C4 and the resistor R5 are connected to the 1 st interface of the amplifier U3 and the resistor R7, the 3 rd interface of the amplifier U3 is connected to the 1 st interface of the capacitor C5, the resistor R10, the resistor R9 and the amplifier U38 5 8, respectively, the capacitor C6 and the resistor R10 are connected to the 2 nd interface and the VREF2 interface of the amplifier U8, respectively, the 3 rd interface of the amplifier U8 is grounded, the resistor R9 is connected to the resistor R11 and the 3 rd interface of the amplifier U11, the resistor R11 is grounded, respectively, the resistor R11 is connected to the 2 nd interface and the resistor R11 of the amplifier U11, respectively, and the resistor R11 is connected to the 3 rd interface of the amplifier U11, the resistor R8 is respectively connected with the capacitor C6 and the 2 nd interface of the analog-to-digital converter U5, and the capacitor C6 is grounded.
9. The pH and dissolved oxygen data acquisition module according to claim 5, wherein the resistor R12 of the temperature-voltage conversion circuit (31) is connected with the interfaces of a thermistor RT and a VREF3 respectively, the thermistor RT is grounded, the 3 rd interfaces of the capacitor C7 and 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 with the 2 nd interface of the amplifier U9 and the resistor R13 respectively, the resistor R13 is connected with the 3 rd interfaces of the capacitor C8 and the analog-to-digital converter U5 respectively, and the capacitor C8 is grounded.
10. The pH and dissolved oxygen data acquisition module according to claim 5, 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 is provided with at least three input ports;
the VREF0 interface of the single chip microcomputer (33) is respectively connected with a VREF1 interface of the pH voltage conversion circuit (28), a VREF2 interface of the dissolved oxygen voltage conversion circuit (30) and a VREF3 interface of the temperature voltage conversion circuit (31), the single chip microcomputer (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) is respectively connected with an external power supply;
the voltage of the power supply is 3.3V.
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| CN202210322639.6A CN114813865B (en) | 2022-03-25 | 2022-03-25 | PH and dissolved oxygen general split type sensor |
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| CN202210322639.6A CN114813865B (en) | 2022-03-25 | 2022-03-25 | PH and dissolved oxygen general split type sensor |
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| JPH05231606A (en) * | 1992-01-21 | 1993-09-07 | Mitsubishi Heavy Ind Ltd | Concentration controller for oxygen dissolved in feed water |
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| CN211651640U (en) * | 2020-03-09 | 2020-10-09 | 上海博取环境技术有限公司 | Sensor |
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| CN114813865B (en) | 2023-10-27 |
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