CN111551526A - External chlorine dioxide disinfectant concentration automatic detection device - Google Patents
External chlorine dioxide disinfectant concentration automatic detection device Download PDFInfo
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- CN111551526A CN111551526A CN202010533295.4A CN202010533295A CN111551526A CN 111551526 A CN111551526 A CN 111551526A CN 202010533295 A CN202010533295 A CN 202010533295A CN 111551526 A CN111551526 A CN 111551526A
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- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 238000001514 detection method Methods 0.000 title claims abstract description 73
- 239000000645 desinfectant Substances 0.000 title claims abstract description 46
- 239000004155 Chlorine dioxide Substances 0.000 title claims abstract description 37
- 235000019398 chlorine dioxide Nutrition 0.000 title claims abstract description 37
- 238000004891 communication Methods 0.000 claims abstract description 13
- 230000003321 amplification Effects 0.000 claims abstract description 9
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims description 19
- 238000011001 backwashing Methods 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 230000002421 anti-septic effect Effects 0.000 claims 1
- 238000004140 cleaning Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000004659 sterilization and disinfection Methods 0.000 description 3
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- UKLNMMHNWFDKNT-UHFFFAOYSA-M sodium chlorite Chemical compound [Na+].[O-]Cl=O UKLNMMHNWFDKNT-UHFFFAOYSA-M 0.000 description 2
- 229960002218 sodium chlorite Drugs 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000002834 transmittance Methods 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
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/035—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing by suction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2209/00—Details of machines or methods for cleaning hollow articles
- B08B2209/02—Details of apparatuses or methods for cleaning pipes or tubes
- B08B2209/027—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Apparatus For Disinfection Or Sterilisation (AREA)
Abstract
The automatic concentration detection device for the external chlorine dioxide disinfectant comprises a detection tube, wherein a detection pump is connected to the detection tube, a transparent tube is arranged on the detection tube, a photocell and a light-emitting diode are fixed on the side wall of the transparent tube, and the photocell and the light-emitting diode are both connected with an online detection circuit. The online detection circuit comprises a constant current source circuit, a photocell signal amplification circuit, a master control circuit, a reference source circuit and a communication circuit, wherein the constant current source circuit, the photocell signal amplification circuit, the reference source circuit and the communication circuit are all connected with the master control circuit. The two ends of the detection tube are respectively connected to the bottom and the upper part of the disinfectant barrel, the detection pump is started to pump the disinfectant in the disinfectant barrel, so that the disinfectant in the disinfectant barrel circulates in and out of the disinfectant barrel, and the concentration of the detected solution is obtained by a signal sent by the photocell receiving diode through the online detection circuit. The device can be hung externally on the outer parts of various boxes, has an automatic cleaning function, is convenient to calibrate, and is suitable for various boxes.
Description
Technical Field
The invention relates to a device for automatically detecting the concentration of a chlorine dioxide disinfectant, belonging to the technical field of detection of the concentration of the chlorine dioxide disinfectant.
Background
Chlorine dioxide is generally produced by quantitatively injecting hydrochloric acid and sodium chlorate (or sodium chlorite) into a reaction tank, and the reaction tank is heated to generate chemical reaction between chlorine dioxide and chlorine. Quantitatively conveying a sodium chlorate aqueous solution (or a sodium chlorite aqueous solution with a certain concentration, a raw material A) and hydrochloric acid (a raw material B) with a certain concentration into a reaction tank, reacting at a certain temperature to generate a gas-liquid mixture of chlorine dioxide and chlorine, preparing a chlorine dioxide mixed disinfectant with a certain concentration by an aeration technology, sucking the chlorine dioxide mixed disinfectant by a water injector, and adding the chlorine dioxide mixed disinfectant into a disinfection water body or an object to be disinfected to complete the synergistic disinfection, oxidation and other effects of the chlorine dioxide and the chlorine.
In the prior art, the concentration of the chlorine dioxide disinfectant is controlled by a preparation device (a chlorine dioxide generator) through the pumping amount of raw materials, real-time detection is not available, the concentration of the chlorine dioxide disinfectant cannot be accurately controlled, and the required chlorine dioxide disinfectant with accurate concentration cannot be provided in real time according to environmental conditions.
Disclosure of Invention
Aiming at the defects of the existing chlorine dioxide disinfectant concentration detection technology, the invention provides the external chlorine dioxide disinfectant concentration automatic detection device which is simple in structure and convenient and accurate to detect.
The invention relates to an external chlorine dioxide disinfectant concentration automatic detection device, which adopts the following technical scheme:
the device comprises a detection tube, wherein a detection pump is connected to the detection tube, a transparent tube is arranged on the detection tube, a photocell and a light emitting diode are fixed on the side wall of the transparent tube, and the photocell and the light emitting diode are both connected with an online detection circuit.
The detection pipe is connected with a calibration pump through a calibration valve.
The device also comprises a backwashing pipe, a backwashing pump is connected to the backwashing pipe, and the backwashing pump is connected with the detection pipe through a backwashing valve.
The online detection circuit comprises a constant current source circuit, a photocell signal amplification circuit and a main control circuit, wherein the constant current source circuit and the photocell signal amplification circuit are connected with the main control circuit.
The constant current source circuit comprises a low-dropout voltage regulator U5, a triode Q1, a resistor R2 and a resistor R14, wherein the ADJ end and the output end of the low-dropout voltage regulator U5 are connected with the light-emitting diode through a resistor R2 to provide constant current, and the light-emitting diode is connected with a singlechip in the main control circuit through a triode Q1 and a resistor R14 to control the light-emitting or the closing of the light-emitting diode.
The photocell amplifying circuit comprises an operational amplifier U3, an operational amplifier U4, a resistor R10, a resistor R12, a resistor R13, a resistor R15 and a resistor R16, wherein a photocell is connected with the operational amplifier U4, the resistor R12 is connected with input and output pins of an operational amplifier U4 to form an I-V circuit, current signals received by the photocell and generated by a light source of a light emitting diode are converted into voltage, the operational amplifier U4 is connected with the input pin of the operational amplifier U3 through a resistor R10, the operational amplifier U3, the resistor R15 and the resistor R16 form a homodromous amplifying circuit, and the signals are amplified and then input to a singlechip U1 in a main control circuit through the resistor R13 to be subjected to AD conversion.
The main control circuit comprises a single chip microcomputer U1, and the single chip microcomputer U1 is connected with the output end of the photocell amplifying circuit.
The main control circuit is also connected with a reference source circuit and a communication circuit.
The reference source circuit comprises a precision band-gap reference voltage source U2, a resistor R1, a resistor R5 and a triode Q2. The control end of a precise band-gap reference voltage source U2 is connected with a singlechip U1 of the main control circuit through a resistor R1, a resistor R5 and a triode Q2, and the output end of the precise band-gap reference voltage source U2 is connected with a VREF pin of a singlechip U1 to provide reference voltage for AD conversion in the singlechip U1.
The communication circuit comprises a low-power-consumption half-duplex transceiver chip U6, a resistor R11, a resistor R18, a resistor R19, a resistor R20, a resistor R21 and a capacitor C14. The input end and the control end of the low-power-consumption half-duplex transceiver chip U6 are connected with the single chip microcomputer U1 of the main control circuit, and the TTL level output by the single chip microcomputer U1 is converted into the RS-485 standard level. And carrying out real-time communication with a display screen or a controller.
During detection, the two ends of the detection tube are respectively connected to the bottom and the upper part of the disinfectant barrel, and the detection pump is started to pump disinfectant in the disinfectant barrel, so that the disinfectant in the disinfectant barrel circulates in the disinfectant barrel and is detected in real time. The change of the concentration of the disinfectant can influence the light transmittance of the transparent section of the detection tube, the light emitting diode can change by the illumination degree, the signal sent by the photocell receiving diode obtains the concentration of the detected solution through the online detection circuit and is transmitted to the display screen, and the concentration of the current disinfectant is displayed on the display screen in real time.
The invention is used for real-time on-line detection of the chlorine dioxide disinfectant, is simple and ingenious, is different from the existing detection device, can be hung outside various box bodies, has an automatic cleaning function, is convenient to calibrate, is suitable for various box bodies, is convenient to disassemble and replace, and has wide application range.
Drawings
Fig. 1 is a schematic structural diagram of a real-time on-line detection device for chlorine dioxide disinfectant of the present invention.
Fig. 2 is a schematic diagram of a constant current source circuit in the detection circuit.
Fig. 3 is a schematic diagram of a photocell signal amplification circuit in the detection circuit.
Fig. 4 is a schematic diagram of a master control circuit in the detection circuit.
Fig. 5 is a schematic diagram of a reference source in the detection circuit.
Fig. 6 is a schematic diagram of a communication circuit in the detection circuit.
In the figure: 1. the device comprises a display screen, 2 parts of a recoil pump, 3 parts of a light emitting diode, 4 parts of a photocell, 5 parts of a recoil valve, 6 parts of a calibration pump, 7 parts of a calibration valve, 8 parts of a detection pump, 9 parts of a disinfectant barrel, 10 parts of a detection pipe, 11 parts of a backwashing pipe, 12 parts of a transparent pipe and 13 parts of an online detection circuit.
Detailed Description
As shown in FIG. 1, the real-time on-line detection device for chlorine dioxide disinfection solution of the present invention comprises a detection tube 10, a photocell 4, a display screen 1 and a backwashing tube 11. The detection tube 10 is connected with a detection pump 8, a calibration valve 7, a recoil valve 5 and a transparent tube 12 in sequence, and a photocell 4 (a photocell D2 in figure 3) and a light emitting diode 3 (a light emitting diode D3 in figure 2) are relatively fixed on the side wall of the transparent tube 12 and are sealed. The photovoltaic cell 4 is a silicon photovoltaic cell. The calibration valve 7 and the backflushing valve 5 are three-way valves, two ports of the calibration valve 7 are connected in the detection pipe 10, the third port of the calibration valve 7 is connected with the calibration pump 6, and the third port of the backflushing valve 5 is connected with one end of the backflushing pipe 11. One end of the backwashing pipe 11 is connected with the backwashing valve 5, and the other end is open and is connected with the upper part of the disinfectant barrel 9 when in use.
The photocell 4 and the light emitting diode 3 are both connected with the online detection circuit 13, the online detection circuit 13 comprises a constant current source circuit, a photocell signal amplification circuit, a main control circuit, a reference source circuit and a communication circuit, and the constant current source circuit, the photocell signal amplification circuit, the reference source circuit and the communication circuit are all connected with the main control circuit, specifically referring to fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6.
As shown in fig. 2, the constant current source circuit includes a low dropout voltage regulator U5, a transistor Q1, a resistor R2, a resistor R8, a resistor R14, a capacitor C3, a capacitor C18, and a capacitor C19, and D3 is a light emitting diode (3 in fig. 1). The input terminal VIN of the low dropout voltage regulator U5 inputs a voltage of 5V through a resistor R8 and is grounded through a capacitor C18. The voltage of the ADJ end and the output end VOUT is 1.25V, the two ends (the ADJ end and the output end) are respectively connected with the resistor R2 and the capacitor C3, and the light-emitting diode D3 is connected with the resistor R2 and can provide constant current for the light-emitting diode D3. The output terminal VOUT is grounded through a capacitor C19. The light emitting diode D3 is connected with the singlechip U1 in the main control circuit through the triode Q1 and the resistor R14, and the light emitting diode D3 can be controlled to emit light or be turned off through the input pin P2.6 of the singlechip U1. Normally, the D3 is in a closed state, and the light-emitting diode D3 is turned on to emit light during detection, so that the problems of heat generation and signal output drift of the light-emitting diode due to long-time work can be solved.
As shown in fig. 3, the photocell amplifying circuit includes an operational amplifier U3, an operational amplifier U4, a resistor R10, a resistor R12, a resistor R13, a resistor R15, a resistor R16, a capacitor C1, a capacitor C2, a capacitor C10, a capacitor C11 and a photocell D2 (4 in fig. 1), wherein the resistor R12 is connected with input and output pins of the operational amplifier U4 to form an I-V circuit, and converts a current signal received by the photocell and generated by the light source of the light emitting diode into a voltage, and then the voltage is connected with the input pin of the operational amplifier U3 through the resistor R10. The resistor R15, the resistor R16 and the operational amplifier U3 form a equidirectional amplifying circuit, and the signals are amplified and then input to an AOUT pin of a singlechip U1 in the main control circuit through the resistor R13 to be subjected to AD conversion.
As shown in fig. 4, the main control circuit includes a single chip microcomputer U1, a capacitor C5, a capacitor C6, a capacitor C8 and a resistor R3. A pin P1.0 of a singlechip U1 is input into an analog signal output by a photocell amplifying circuit, a 12-bit ADC and a reference voltage of a reference source circuit are adopted by the singlechip U1, the analog signal is converted into a digital signal (namely the read AD value of the singlechip U1) which is used as a measurement value (N, D23, D1 and D in a calculation formula) of a chlorine dioxide on-line detection circuit 13, a concentration value is calculated through an algorithm, the singlechip U1 serial port RX is connected with a communication circuit, and the concentration value is sent to a display screen 1 or a controller.
The chlorine dioxide concentration calculation adopts the solution with three prepared concentrations (generally 0ppm, 250ppm and 800ppm), and obtains the measurement values of the concentrations of the three solutions and the colorimeter measurement value, through comparison of the data of the three solutions, the coefficient K is calculated according to the following formula (1), the coefficient B is calculated according to the following formula (2), and then the concentration of the solution to be measured is calculated according to the following formula (3).
K＝[(D23-N)/B23-(D1-N)/B1]/((D23-D1)/1000)，(1)
B＝[(D23-N)/B23]-[(D23-N)/1000]*K，(2)
Y＝(D-N)/((K*(D-N)/1000)+B))，(3)
Wherein:
n: the basic value is the measured value of the on-line detection circuit 13 in the 0ppm concentration solution;
d23: the high value of the reading is the measured value of the on-line detection circuit 13 in the high concentration (800ppm) solution;
b23: the reading high value of the colorimeter is the measured value of the colorimeter in a high-concentration (800ppm) solution;
d1: the median reading value is the measured value of the on-line detection circuit 13 in a medium concentration (250ppm) solution;
b1: the median colorimeter reading, which is the measured value of the colorimeter in a medium concentration (250ppm) solution;
y: the actual concentration value is the actual concentration value of the solution to be detected;
d: the sampling value is the measurement value of the online detection circuit 13 in the solution to be detected;
the measured values (N, D23, D1 and D) of the chlorine dioxide on-line detection circuit 13 are analog signals output by a photocell amplifying circuit and input through a pin P1.0 of a U1 of the singlechip, and are converted into digital signals, namely read AD values of the singlechip U1, by a 12-bit ADC and a reference voltage of a reference source circuit in the singlechip U1, wherein the reference voltage adopts 2.5V of the reference source circuit.
As shown in fig. 5, the reference source circuit includes a precision bandgap reference voltage source U2, a resistor R1, a resistor R4, a resistor R5, a capacitor C12, a capacitor C13, a capacitor C14, and a transistor Q2. The input end of a precise band-gap reference voltage source U2 is connected with a 5V power supply, a pin P1.3 of a singlechip U1 is connected with the control end of the precise band-gap reference voltage source U2 through a resistor R1, a resistor R5 and a triode Q2, the output of a reference source can be controlled by the singlechip U1, the output of the reference source is connected with a VREF pin of the singlechip U1, and reference voltage is provided for AD conversion in the singlechip U1.
As shown in fig. 6, the communication circuit includes a low power consumption half-duplex transceiver chip U6, a resistor R11, a resistor R18, a resistor R19, a resistor R20, a resistor R21, and a capacitor C14. An input pin of the low-power-consumption half-duplex transceiver chip U6 is connected with RX and TX signals of the single chip microcomputer U1, a control pin is connected with P0.6 of the single chip microcomputer U1, and a TTL level output by the single chip microcomputer U1 can be converted into an RS-485 standard level to be communicated with the display screen 1 or the controller in real time.
The various chips referred to above are prior art.
The detection process of the above device is as follows.
One end of the detection tube 10 is connected to the bottom of the sterilizing liquid barrel 9, and the other end of the detection tube 10 and the open end of the backwashing tube 11 are connected to the upper portion of the sterilizing liquid barrel 9. Under a normal state, a third port of the backflushing valve 5, which is connected with the backflushing pipe 11, is closed, and the other two ports are communicated; the third port of the calibration valve 7 connected with the calibration pump 6 is also closed, and the other two ports are communicated.
And starting the detection pump 8, and pumping the disinfectant in the disinfectant barrel 9 for detection. The constant current source circuit in the on-line detection circuit 13 supplies a constant current to cause the light emitting diode 3 to emit a light signal. The photocell 4 receives the optical signal, the photocell amplifying circuit in the on-line detection circuit 13 amplifies the signal of the photocell and inputs the signal to the singlechip U1 in the main control circuit for AD conversion, the converted digital signal (namely the read AD value of the singlechip U1) is used as the measurement value of the chlorine dioxide on-line detection circuit 13, the singlechip U1 calculates the concentration value according to the stored algorithm, the communication circuit in the on-line detection circuit 13 sends the concentration value to the display screen 1 or the controller, and the concentration of the current disinfectant is displayed on the display screen 1 in real time. The controller controls the amount of chlorine dioxide gas discharged into the disinfectant barrel 9 from the dioxide furnace reactor.
When the tube wall of the transparent tube 12 needs to be cleaned, the third port of the backflushing valve 5 is communicated with the backflushing pump 2, and the backflushing pump 2 pumps the liquid in the transparent tube 12 and discharges the liquid into the disinfectant barrel 9.
When the device needs to be calibrated again, the calibration valve 7 works, and the calibration pump 6 sends the standard solution (i.e. the three concentrations (0ppm, 250ppm and 800ppm) mentioned above) into the transparent tube 12 for calibration, i.e. the coefficient K is calculated according to the formula (1) and the coefficient B is calculated according to the formula (2).
Claims (10)
1. An external chlorine dioxide antiseptic solution concentration automatic checkout device, characterized by: the detection device comprises a detection tube, wherein a detection pump is connected to the detection tube, a section of the detection tube is a transparent tube, a photocell and a light emitting diode are fixed on the side wall of the transparent tube, and the photocell and the light emitting diode are both connected with an online detection circuit.
2. The external device for automatically detecting the concentration of chlorine dioxide disinfectant as claimed in claim 1, wherein: the detection pipe is connected with a calibration pump through a calibration valve.
3. The external device for automatically detecting the concentration of chlorine dioxide disinfectant as claimed in claim 1, wherein: the device also comprises a backwashing pipe, a backwashing pump is connected to the backwashing pipe, and the backwashing pump is connected with the detection pipe through a backwashing valve.
4. The external device for automatically detecting the concentration of chlorine dioxide disinfectant as claimed in claim 1, wherein: the online detection circuit comprises a constant current source circuit, a photocell signal amplification circuit and a main control circuit, wherein the constant current source circuit and the photocell signal amplification circuit are connected with the main control circuit.
5. The external device for automatically detecting the concentration of chlorine dioxide disinfectant as claimed in claim 4, wherein: the constant current source circuit comprises a low-dropout voltage regulator U5, a triode Q1, a resistor R2 and a resistor R14, wherein the ADJ end and the output end of the low-dropout voltage regulator U5 are connected with the light-emitting diode through a resistor R2 to provide constant current, and the light-emitting diode is connected with a singlechip in the main control circuit through a triode Q1 and a resistor R14 to control the light-emitting or the closing of the light-emitting diode.
6. The external device for automatically detecting the concentration of chlorine dioxide disinfectant as claimed in claim 4: the photocell amplifying circuit comprises an operational amplifier U3, an operational amplifier U4, a resistor R10, a resistor R12, a resistor R13, a resistor R15 and a resistor R16, wherein a photocell is connected with the operational amplifier U4, the resistor R12 is connected with input and output pins of an operational amplifier U4 to form an I-V circuit, current signals received by the photocell and generated by a light source of a light emitting diode are converted into voltage, the operational amplifier U4 is connected with the input pin of the operational amplifier U3 through a resistor R10, the operational amplifier U3, the resistor R15 and the resistor R16 form a homodromous amplifying circuit, and the signals are amplified and then input to a singlechip U1 in a main control circuit through the resistor R13 to be subjected to AD conversion.
7. The external device for automatically detecting the concentration of chlorine dioxide disinfectant as claimed in claim 4, wherein: the main control circuit comprises a single chip microcomputer U1, and the single chip microcomputer U1 is connected with the output end of the photocell amplifying circuit.
8. The external device for automatically detecting the concentration of chlorine dioxide disinfectant as claimed in claim 4, wherein: the main control circuit is also connected with a reference source circuit and a communication circuit.
9. The external device for automatically detecting the concentration of chlorine dioxide disinfectant as claimed in claim 8, wherein: the reference source circuit comprises a precision band-gap reference voltage source U2, a resistor R1, a resistor R5 and a triode Q2. The control end of the precision band-gap reference voltage source U2 is connected with a singlechip U1 of the main control circuit through a resistor R1, a resistor R5 and a triode Q2, and the output end of the precision band-gap reference voltage source U2 is connected with a singlechip U1 to provide reference voltage for AD conversion in the singlechip U1.
10. The in-line detection device for the concentration of the built-in chlorine dioxide disinfectant as recited in claim 8, which is characterized in that: the communication circuit comprises a low-power-consumption half-duplex transceiver chip U6, a resistor R11, a resistor R18, a resistor R19, a resistor R20, a resistor R21 and a capacitor C14, wherein the input end and the control end of the low-power-consumption half-duplex transceiver chip U6 are connected with the singlechip U1 of the main control circuit.
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| CN202010533295.4A CN111551526A (en) | 2020-06-11 | 2020-06-11 | External chlorine dioxide disinfectant concentration automatic detection device |
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| CN202010533295.4A CN111551526A (en) | 2020-06-11 | 2020-06-11 | External chlorine dioxide disinfectant concentration automatic detection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112082963A (en) * | 2020-09-11 | 2020-12-15 | 河南科技大学第一附属医院 | Endoscope disinfectant detecting system |
| CN112439082A (en) * | 2020-11-10 | 2021-03-05 | 珠海格力电器股份有限公司 | Concentration detection circuit, disinfectant manufacturing machine and control method thereof |
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