CN205720072U - Total dissolved solid value detection equipment - Google Patents
Total dissolved solid value detection equipment Download PDFInfo
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- CN205720072U CN205720072U CN201620253959.0U CN201620253959U CN205720072U CN 205720072 U CN205720072 U CN 205720072U CN 201620253959 U CN201620253959 U CN 201620253959U CN 205720072 U CN205720072 U CN 205720072U
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Abstract
The open a kind of total dissolved solid value detection equipment of this utility model, this detection equipment comprises: total dissolved solid value test side, the drinking water in its contact drinking equipment, detects and upload total dissolved solid value detection signal；Total dissolved solid value testing circuit, its circuit connects total dissolved solid value test side, to total dissolved solid value test side output drive signal, receive the total dissolved solid value detection signal uploaded total dissolved solid value test side, gather the total dissolved solid value of drinking water.This utility model utilizes analog switch, two probes is alternately produced driving pulse, weakens polarization phenomena and cell reaction, it is ensured that the concordance of power supply, improve final accuracy of detection；Use single power supply to provide the method for designing of excitation, effectively avoid, because negative supply produces the error brought, reducing the complexity of circuit design, it is ensured that the accuracy of TDS detection.
Description
Technical field
This utility model relates to clean water treatment detection field, is specifically related to a kind of total dissolved solid value detection equipment.
Background technology
Along with improving constantly of economic level, the quality of the life of people is also become better and better, and the requirement to water quality is more and more higher, and at present, people compare the TDS value seeing heavy water.
TDS value (Total Dissolved
Solids) Chinese full name is total dissolved solid, it is simply that refer to the total amount of the solid being dissolved in the water, and units of measurement is PPM or mg/L.TDS value is the biggest, and the electric conductivity of water is the best, illustrates that the impurity in water is the most, and the quality of water is the poorest.TDS value is the least, illustrates that the impurity in water is the fewest, and the quality of water is the best.
At present, TDS accurately can be provided on the market to measure equipment otherwise volume ratio relatively big, otherwise price comparison is high, it is impossible to apply on common domestic or commercial purifier.And testing circuit one is utilized in two pins one end of popping one's head in and loads certain electromotive force in the measurement equipment of present less expensive, then by measuring two interelectrode voltages, calculate the equivalent conductivity of water, obtain TDS value.During such a detection, tested water can occur cell reaction and polarization phenomena, has a strong impact on certainty of measurement, reduces the service life of water quality probe, and can promote to increase some harmful ion or ionic compounds in water, have impact on the quality of water quality.
Also having one is to utilize positive-negative power to TDS probe pulse signal, the method of positive negative pulse stuffing eliminates the polarization phenomena during TDS measures, thus obtain sample voltage value accurately and reliably, so it is compared to a kind of method more accurate, but, negative supply is usually converted by positive supply, whether use amplifier or the mode of bleeder circuit produces negative supply, all cannot obtain negative supply on all four with positive supply, if the amplifier used or resistance precision are inadequate, the error that will make the negative supply obtained becomes big, thus bring bigger error to measurement result, the accuracy that impact is measured.
Utility model content
This utility model provides a kind of total dissolved solid value detection equipment, utilizes single supply to coordinate analog switch to realize the excitation of positive and negative alternate pulse signal, it is ensured that power supply concordance, improves certainty of measurement.
For achieving the above object, this utility model provides a kind of total dissolved solid value detection equipment, is characterized in, this detection equipment comprises:
Total dissolved solid value test side, the drinking water in its contact drinking equipment, detects and uploads total dissolved solid value detection signal；
Total dissolved solid value testing circuit, its circuit connects total dissolved solid value test side, to total dissolved solid value test side output drive signal, receive the total dissolved solid value detection signal uploaded total dissolved solid value test side, gather the total dissolved solid value of drinking water.
Above-mentioned total dissolved solid value test side comprises double probe.
Above-mentioned total dissolved solid value testing circuit comprises:
Signal exciting circuit, it is to total dissolved solid value test side output drive signal；
Analog switch, its circuit connects total dissolved solid value test side and signal exciting circuit, the alternately conveying of in double probes of total dissolved solid value test side pumping signal, receives the total dissolved solid value detection signal of total dissolved solid value test side feedback；
Acquisition Circuit, its circuit connects analog switch, according to the total dissolved solid value of the total dissolved solid value detection signals collecting drinking water uploaded.
Go back circuit between above-mentioned analog switch and Acquisition Circuit to be connected and have follow circuit.
Above-mentioned detection equipment also comprises:
Temperature detection end, the drinking water in its contact drinking equipment, detects and uploads temperature value detection signal；
Temperature sensing circuit, its inlet circuit connects temperature detection end, receives the temperature value detection signal uploaded, gathers the temperature value of drinking water.
Said temperature testing circuit circuit of output terminal connects total dissolved solid value testing circuit, and total dissolved solid value testing circuit receives the temperature value of drinking water, and the total dissolved solid value of the drinking water gathered is carried out temperature-compensating.
Said temperature test side is PT100 critesistor.
Above-mentioned detection equipment also comprises circuit of output terminal and connects the data display equipment of total dissolved solid value testing circuit outfan, the total dissolved solid value of the drinking water that output total dissolved solid value testing circuit gathers.
Above-mentioned detection equipment also comprises circuit of output terminal and connects the power supply of total dissolved solid value testing circuit.
This utility model total dissolved solid value detection equipment is compared with the total dissolved solid value detection technique of prior art, have an advantage in that, this utility model utilizes analog switch, two probes are alternately produced driving pulse, significantly weaken polarization phenomena and cell reaction, ensure that the concordance of power supply, improve final accuracy of detection；
This utility model uses single power supply to provide the method for designing of excitation, is possible not only to effectively avoid, because negative supply produces the error brought, reducing the complexity of circuit design, also assures that the accuracy that TDS detects simultaneously；
This utility model is provided with temperature detection by measuring water temperature, total dissolved solid value carries out temperature-compensating, improves accuracy of detection；
This utility model is provided with display device, it is simple to operator understand the total dissolved solid value of drinking water in real time by display.
Accompanying drawing explanation
Fig. 1 is the system schematic of this utility model total dissolved solid value detection apparatus embodiments one；
Fig. 2 is the measuring principle figure of this utility model total dissolved solid value detection equipment；
Fig. 3 is the system module figure of this utility model total dissolved solid value detection apparatus embodiments two；
Fig. 4 is the circuit diagram of governor circuit；
Fig. 5 is the circuit diagram of total dissolved solid value testing circuit；
Fig. 6 is the circuit diagram of temperature sensing circuit.
Detailed description of the invention
Below in conjunction with accompanying drawing, further illustrate specific embodiment of the utility model.
The utility model discloses a kind of total dissolved solid value detection equipment, this detection equipment comprises: total dissolved solid value test side and circuit connect the total dissolved solid value testing circuit of total dissolved solid value test side.
Total dissolved solid value test side comprises double probe, i.e. two probes, and it contacts or be immersed in the drinking water in drinking equipment water tank, detects drinking water and upload the total dissolved solid value detection signal of drinking water.
Total dissolved solid value testing circuit is connected with total dissolved solid value test side circuit, to total dissolved solid value test side output drive signal, receive the total dissolved solid value detection signal uploaded total dissolved solid value test side, gather the total dissolved solid value of drinking water.
Total dissolved solid value testing circuit comprises: circuit connects the analog switch of total dissolved solid value test side, the signal exciting circuit of circuit connection analog switch and Acquisition Circuit.
Signal exciting circuit is for total dissolved solid value test side output drive signal.
Analog switching circuit connects total dissolved solid value test side and signal exciting circuit, the conveying pumping signal realized alternately in double probes of total dissolved solid value test side, receives the total dissolved solid value detection signal of total dissolved solid value test side feedback.
Acquisition Circuit is connected with analog switching circuit, receives total dissolved solid value detection signal by analog switch, according to the total dissolved solid value of the total dissolved solid value detection signals collecting drinking water uploaded.
Detection equipment also comprises circuit of output terminal and connects the data display equipment of total dissolved solid value testing circuit outfan, for exporting the total dissolved solid value of the drinking water that total dissolved solid value testing circuit gathers.
Detection equipment also comprises circuit of output terminal and connects the power supply of total dissolved solid value testing circuit, for powering to total dissolved solid value testing circuit.
Such as Fig. 1 and combine shown in Fig. 2, for the embodiment one of a kind of total dissolved solid value detection equipment, this detection equipment comprises: total dissolved solid value test side 101, analog switch 102, follow circuit 103, governor circuit 104.
Total dissolved solid value test side 101 uses two probes, is immersed in the drinking water drinking equipment water tank.Analog switch 102 comprises two stationary contacts and a movable contact, and two stationary contacts connect two probes of total dissolved solid value test side 101 respectively, and movable contact circuit connects the input of follow circuit 103.Follow circuit 103 uses operational amplifier, and circuit of output terminal connects the AD end of governor circuit 104.
Governor circuit 104 is for being integrated with analog switch control circuit, exciting circuit and the integrated circuit of Acquisition Circuit, in the present embodiment, governor circuit 104 uses MCU, IO1 and IO2 of MCU circuit respectively connects the first control end and second of analog switch 102 and controls end, the IO1 of MCU is with certain frequency, such as export the PWM ripple of 2Hz, control the first control end of analog switch 102, the IO2 of MCU is with certain frequency simultaneously, such as export the PWM ripple of 1Hz, control the second control end of analog switch 102, thus control in analog switch 102 two stationary contact of alternate conduction, make analog switch 102 by the stationary contact of conducting by pumping signal alternately transmission to 101 two, total dissolved solid value test side probe.Finally realize analog switch 102 and alternately power (pumping signal) to a probe in total dissolved solid value test side 101, another root probe corresponding carries out the sampling of voltage (total dissolved solid value detection signal), then exported by analog switch 102, the total dissolved solid value of drinking water of finally sampling via the AD mouth of operational amplifier (playing the effect of follower) output to MCU.
In the present embodiment, the pwm signal utilizing governor circuit 104 controls the control end of analog switch 102, single positive supply directly feeds 101 pairs, total dissolved solid value test side probe (TDS electrode) respectively by analog switch 102, and two ends are as test and excitation, thus abandoned negative supply.Thus achieve and power to TDS probe two ends respectively with single positive supply, export and control the sampling time section of TDS voltage by controlling the PWM of MCU simultaneously, it is possible to reasonable elimination polarization phenomena and obtain stable magnitude of voltage.And then eliminate the TDS measurement error brought because positive-negative power is inconsistent, improve the accuracy that TDS measures, the complexity of TDS measuring circuit design can also be reduced simultaneously.
A kind of total dissolved solid value detection equipment disclosed in this utility model also includes temperature detection end and circuit connects the temperature sensing circuit of temperature detection end.
Temperature detection end in contact or the drinking water being immersed in drinking equipment, for detecting and upload the temperature value detection signal of drinking water.
Temperature sensing circuit inlet circuit connects temperature detection end, receives the temperature value detection signal uploaded, gathers the temperature value of drinking water.
Temperature sensing circuit circuit of output terminal connects total dissolved solid value testing circuit, and total dissolved solid value testing circuit receives the temperature value of drinking water, for the total dissolved solid value of the drinking water gathered is carried out temperature-compensating.
As it is shown on figure 3, be the embodiment two of a kind of total dissolved solid value detection equipment, this detection equipment comprises governor circuit 301, total dissolved solid value test side 302, temperature detection end 303, data display equipment 304 and power supply 305.
Wherein, governor circuit 301 comprises TDS testing circuit and temperature sensing circuit, uses integrated circuit STM32F030C8T6；Total dissolved solid value test side 302 uses the double probe of TDS；Temperature detection end 303 uses PT100 critesistor；Data display equipment 304 uses 12864 liquid crystal displays.
Power supply 305 outfan is connected with governor circuit 301, data display equipment 304 respectively, total dissolved solid value test side 302 and temperature detection end 303 outfan are all connected with governor circuit 301 input, and governor circuit 301 outfan is connected with data display equipment 304 input.During work, power supply 305 is powered, governor circuit 301 is to total dissolved solid value test side 302 bipod positive and negative alternate pulse signal, and utilize AD sample total dissolved solid value test side 302 two probes between voltage, sampling obtains total dissolved solid value, and utilizes the temperature value adopted that total dissolved solid value is carried out temperature-compensating.Finally total dissolved solid value is shown by data display equipment 304.
As shown in Figure 4, for the circuit diagram of governor circuit, integrated circuit STM32F030C8T6 carries out the output of pulse excitation, and the sampling of magnitude of voltage (total dissolved solid value detection signal), temperature value is sampled, and the display of final data.PB5, as the first output signal, controls analog switch.PA11, as the second output signal, continues output pulse signal to the TDS probe of total dissolved solid value test side.PA3 carries out process collect total dissolved solid value as the first input signal, the probe both end voltage signal that reception is adopted.The temperature adopted, as the second input signal, is compensated computing to total dissolved solid value by PA5, improves overall precision.
As it is shown in figure 5, be the circuit diagram of total dissolved solid value testing circuit.Utilizing SGM3699 analog switch and single supply in the present embodiment, a chip port is to pulse signal, and by intervalometer, alternately output is arrived above TDS probe.Then by the voltage between two probes being sampled after a follow circuit.TDS_DIR end separated in time controls analog switch output, and TDS_PWM end provides pulse excitation, so ensure that the concordance of power supply, also substantially increase final certainty of measurement.Wherein, TDS1, TDS2 connect the both threads of TDS probe respectively, and U8 is as voltage follower, it is ensured that signal the weakest, and TDS_DIR end controls analog switch, and TDS_PWM supports continuous input pulse signal, PA1 end as outfan to controller.
As shown in Figure 6, for the circuit diagram of temperature sensing circuit, temperature detection end uses three line PT100 critesistor, improves certainty of measurement.PT100 resistance, in the case of 0 degree Celsius, resistance is 100 ohm, utilize Wheatstone bridge, being that the temperature of PT100 resistance also changes when temperature changes, between bridge, voltage also changes, then is amplified voltage processing, it is converted into resistance value by calculating, finally utilizes look-up table to obtain temperature value.Wherein PT1001, PT1002, PT1003, connects three pins of three-wire system PT100 critesistor respectively, utilizes OP-07 as amplifier chip, uses the positive and negative 3.3V of dual power supply to be powered, PA5 as signal output part to controller.
Although content of the present utility model has been made to be discussed in detail by above preferred embodiment, but it should be appreciated that the description above is not considered as restriction of the present utility model.After those skilled in the art have read foregoing, multiple amendment of the present utility model and replacement all be will be apparent from.Therefore, protection domain of the present utility model should be limited to the appended claims.
Claims (9)
1. a total dissolved solid value detection equipment, it is characterised in that this detection equipment comprises:
Total dissolved solid value test side, the drinking water in its contact drinking equipment, detects and uploads total dissolved solid value detection signal；
Total dissolved solid value testing circuit, its circuit connects total dissolved solid value test side, to total dissolved solid value test side output drive signal, receive the total dissolved solid value detection signal uploaded total dissolved solid value test side, gather the total dissolved solid value of drinking water.
2. total dissolved solid value detection equipment as claimed in claim 1, it is characterised in that described total dissolved solid value test side comprises double probe.
3. total dissolved solid value detection equipment as claimed in claim 2, it is characterised in that described total dissolved solid value testing circuit comprises:
Signal exciting circuit, it is to total dissolved solid value test side output drive signal；
Analog switch, its circuit connects total dissolved solid value test side and signal exciting circuit, the alternately conveying of in double probes of total dissolved solid value test side pumping signal, receives the total dissolved solid value detection signal of total dissolved solid value test side feedback；
Acquisition Circuit, its circuit connects analog switch, according to the total dissolved solid value of the total dissolved solid value detection signals collecting drinking water uploaded.
4. total dissolved solid value detection equipment as claimed in claim 3, it is characterised in that go back circuit between described analog switch and Acquisition Circuit and be connected and have follow circuit.
5. total dissolved solid value detection equipment as claimed in claim 1, it is characterised in that this detection equipment also comprises:
Temperature detection end, the drinking water in its contact drinking equipment, detects and uploads temperature value detection signal；
Temperature sensing circuit, its inlet circuit connects temperature detection end, receives the temperature value detection signal uploaded, gathers the temperature value of drinking water.
6. total dissolved solid value detection equipment as claimed in claim 5, it is characterized in that, described temperature sensing circuit circuit of output terminal connects total dissolved solid value testing circuit, total dissolved solid value testing circuit receives the temperature value of drinking water, and the total dissolved solid value of the drinking water gathered is carried out temperature-compensating.
7. the total dissolved solid value detection equipment as described in claim 5 or 6, it is characterised in that described temperature detection end is PT100 critesistor.
8. total dissolved solid value detection equipment as claimed in claim 1, it is characterized in that, described detection equipment also comprises circuit of output terminal and connects the data display equipment of total dissolved solid value testing circuit outfan, the total dissolved solid value of the drinking water that output total dissolved solid value testing circuit gathers.
9. total dissolved solid value detection equipment as claimed in claim 1, it is characterised in that described detection equipment also comprises circuit of output terminal and connects the power supply of total dissolved solid value testing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620253959.0U CN205720072U (en) | 2016-03-30 | 2016-03-30 | Total dissolved solid value detection equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620253959.0U CN205720072U (en) | 2016-03-30 | 2016-03-30 | Total dissolved solid value detection equipment |
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| CN205720072U true CN205720072U (en) | 2016-11-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108732322A (en) * | 2017-04-14 | 2018-11-02 | 上海朴道水汇环保科技股份有限公司 | A kind of water quality detecting device of straight drink equipment |
| CN110763735A (en) * | 2019-10-18 | 2020-02-07 | 深圳和而泰数据资源与云技术有限公司 | Soluble total solid TDS detection method and related equipment |
| CN112083133A (en) * | 2020-08-18 | 2020-12-15 | 惠州拓邦电气技术有限公司 | Nonlinear water solubility total solid compensation method and detection device |
-
2016
- 2016-03-30 CN CN201620253959.0U patent/CN205720072U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108732322A (en) * | 2017-04-14 | 2018-11-02 | 上海朴道水汇环保科技股份有限公司 | A kind of water quality detecting device of straight drink equipment |
| CN110763735A (en) * | 2019-10-18 | 2020-02-07 | 深圳和而泰数据资源与云技术有限公司 | Soluble total solid TDS detection method and related equipment |
| CN110763735B (en) * | 2019-10-18 | 2022-04-29 | 深圳和而泰数据资源与云技术有限公司 | Soluble total solid TDS detection method and related equipment |
| CN112083133A (en) * | 2020-08-18 | 2020-12-15 | 惠州拓邦电气技术有限公司 | Nonlinear water solubility total solid compensation method and detection device |
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