CN102279177B - On-line DPD residual chlorine analyzer - Google Patents
On-line DPD residual chlorine analyzer Download PDFInfo
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- CN102279177B CN102279177B CN 201110063116 CN201110063116A CN102279177B CN 102279177 B CN102279177 B CN 102279177B CN 201110063116 CN201110063116 CN 201110063116 CN 201110063116 A CN201110063116 A CN 201110063116A CN 102279177 B CN102279177 B CN 102279177B
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Abstract
The invention provides an on-line DPD residual chlorine analyzer, comprising a sampling pump for extracting water samples, a first reagent pump for extracting a buffer solution, a second reagent pump for extracting a DPD medicament, a detector for detecting the content of residual chlorine in the water samples and a control unit, wherein, the control unit comprises a sampling signal generating circuit, a power driver, a first switch circuit, a detecting signal generating circuit, a second switch circuit, a third switch circuit and an output module. The on-line DPD residual chlorine analyzer disclosed in the invention is an independent portable device with good portability. According to the invention, the water samples processed by filtering and purification are injected into a flowing detecting pool, and the buffer solution and DPD indicator are injected into the flowing detecting pool simultaneously according to certain proportions, so that the detection of residual chlorine of the detector can be carried out. The present invention can detect the water samples on site in real time with simple operation, so that the professional risks of operators are reduced greatly.
Description
Technical field
The present invention relates to a kind of water sample analysis device, relate in particular to a kind of online diethyl-p-phenylenediamine sulfate DPD(diethyl-p-phenylenediamine, be called for short DPD) the chlorine residue analyser.
Background technology
In tap water, municipal administration and industrial waste water, recycle-water, industrial circulating cooling water, chlorination or disinfection system such as desalinize seawater, the chlorine residue analyser is indispensable monitoring instrument, and it is mainly used in adopting the check of chlorine-containing disinfectant effect in the water treatment process.It substantially all is to use following two kinds of methods that present chlorine residue analyser carries out the chlorine residue detection: DPD analytic approach and electrode method.The electrode method adopts electrochemical principle, and cost is higher, and electrode diaphragm is easily impaired and contaminated, and serviceable life is short, need often to clean, and the especially accuracy that influence is measured when containing surfactant in the water body, plant maintenance is also comparatively numerous and diverse.The DPD analytic approach is comparatively general, owing to belong to chemistry titration-colorimetric analysis category, is applicable to the laboratory manual analysis, and operation formula and step are numerous and diverse, and operating process has potential hazard to the staff.
Summary of the invention
The object of the present invention is to provide a kind of online DPD chlorine residue analyser, be only applicable to solve present DPD analytic approach that application conditions harshness, range of application that the laboratory manual analysis causes are limited, trivial operations and have the problem of harm.
To achieve these goals, online DPD chlorine residue analyser provided by the invention comprises the sampling pump that extracts water sample, extract first compound pump of buffer solution, extract second compound pump of DPD medicament, detect detecting device and the control module of contents of residual chlorine in the water sample, the output channel of described first compound pump is coupled to the output channel of described second compound pump by a three-way connection, the output channel of described second compound pump is coupled to the output channel of described sampling pump by another three-way connection, and the water sample of this sampling pump, this DPD medicament of this buffer solution of this first compound pump and this second compound pump injects in the mobile measuring cell according to a certain percentage, and described control module comprises sampled signal generation circuit, analog line driver, first on-off circuit, detection signal generation circuit, the second switch circuit, the 3rd on-off circuit, output module; Sampled signal generation circuit and a power module couple, for generation of a sampled signal; Analog line driver and described sampled signal generation circuit couple, and receive described sampled signal and export one first power amplification signal; First on-off circuit and described analog line driver, sampling pump and power module couple, and receive the described first power amplification signal and make described sampling pump and described power module conducting, extract water sample to start described sampling pump; Detection signal generation circuit and described first on-off circuit and described analog line driver couple, after described sampled signal stops, produce a detection signal, and send described detection signal to described analog line driver, described analog line driver produces one second power amplification signal; Second switch circuit and described analog line driver, detecting device and power module couple, and are used for receiving the described second power amplification signal and make described detecting device and described power module conducting, detect the water sample that described sampling pump extracts to start described detecting device; The 3rd on-off circuit and described analog line driver, first compound pump, second compound pump, power module couple, described detection signal is after one schedule time of interval, described the 3rd on-off circuit is controlled described first compound pump, second compound pump and described power module conducting, injects buffer solution and DPD medicament to start in the water sample that described first compound pump, second compound pump extract to described sampling pump; Output module and described detecting device couple, and are used for the detection data of the described detecting device of output.
The present invention is a mancarried device independently, and is easy to carry, water sample after filtration, purify the back and inject one and flow in the measuring cell, buffer solution and DPD indicator are injected in the flow measurement pond according to a certain percentage simultaneously, can carry out the chlorine residue detection by detecting device.As seen the present invention can detect water sample at the scene in real time, and is simple to operate, greatly reduces operating personnel's professional risk.
Description of drawings
Fig. 1 is the circuit structure principle schematic of the preferred embodiment of the present invention;
Fig. 2 is power and the piping system structural representation of the preferred embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further details.
Fig. 1 schematically shows the circuit structure of the preferred embodiment of the present invention, this preferred embodiment comprises a plurality of functional modules, for example comprises sampling pump (pump) P1 that extracts water sample, extract the compound pump P2 of buffer solution, the power system of the compound pump P3 of extraction DPD medicament and detecting device (sensor) SE that detects contents of residual chlorine in the water sample, be used for showing that detecting device SE detects display (display) DI of data, the intermitten service signal generating circuit that comprises timer (timer) T1, the sampled signal generation circuit that comprises timer T2, the detection frequency signal generating circuit that comprises timer T3, the detection signal generation circuit that comprises timer T4, be used for analog line driver (power driver) PD that the signal that above-mentioned each signal generating circuit produces is carried out power amplification, electromagnetic relay (Electromagnetic Relay) E1-E7 that the electric signal direction is used as on-off circuit in the circuit switched, power module (power supply) PS of electric power supply is provided, sampling lamp and analysis lamp L1-L2 as the signal indication, mode selector switch (switch) S1, interruptions of sleep switch S 2.Need to prove that above-mentioned a plurality of parts are not necessary by the present invention, it only is parts that the preferred embodiment of the present invention shown in Figure 1 comprises; Especially power module PS in order to simplify accompanying drawing and to be convenient to explanation, below describes and thinks that power module PS can provide the direct current of multiple voltage level for each parts; In addition, the terminal NO of each electromagnetic relay E1-E7 is that normally opened contact, NC are normally closed contact, C is transfer contact.
In Fig. 1, the intermitten service signal generating circuit is for generation of a pulse waveform signal and export described analog line driver PD to, control this preferred embodiment with this and run on discontinuous mode, also namely after water sample is continued to detect a schedule time, enter sleep state, this sample preferred embodiment can energy efficient, prolongs parts serviceable life.This intermitten service signal generating circuit comprises 555 timer T1, variable resistor R3 and R5, capacitor C 1 and C2, diode (diode) D1 and D2, resistance R 1-R2 and R4.The negative electrode of diode D1 is coupled to the pin 7 of 555 timer T1, and its anode is coupled to the end of variable resistor R5 via resistance R 4, and the tap of variable resistor R5 is coupled to ground (being the negative pole end of power module PS) via capacitor C 1.Resistance R 1 is coupled between the pin 7 and pin 4 of 555 timer T1.The negative electrode of diode D2 is coupled to the end of variable resistor R3, and its anode is coupled to the pin 7 of 555 timer T1 via resistance R 2, and the tap of variable resistor R3 is coupled to the pin 2 of 555 timer T1.The pin 5 of 555 timer T1 is coupled to ground by capacitor C 2.The pin 3 of 555 timer T1 and the pin 2 of analog line driver PD couple for to analog line driver PD output pulse waveform signal, pulse width is this preferred embodiment and is operated in working time when discontinuous mode, those skilled in the art analyze as can be known, change the length that variable-resistance resistance that 555 timer T1 couple can be adjusted this working time and interval time.
Analog line driver PD has numerous embodiments, and the model of the analog line driver chip of this preferred embodiment is MC1416.
The effect of sampled signal generation circuit is to produce a sampled signal, to start this preferred embodiment.This sampled signal generation circuit comprises 555 timer T2, variable resistor R7, capacitor C 3 and C4, diode D3.The anode of diode D3 is coupled to the pin 2 of 555 timer T2, and its negative electrode is coupled to the pin 8 of 555 timer T2.The end of variable resistor R7 is coupled to pin 8 and the pin 4 of 555 timer T2 by a resistance R 6, and its tap is coupled to ground by capacitor C 3.Capacitor C 4 is coupled between the pin 5 and ground of 555 timer T2.The pin 3 of 555 timer T2 couples to export sampled signal with the pin 3 of analog line driver PD.
Detection signal generation circuit is used for producing a detection signal after sampled signal stops, and sends detection signal to analog line driver PD, start-up detector SE operation.This detection signal generation circuit comprises 555 timer T4, variable resistor R13, capacitor C 7 and C8, diode D4.The anode of diode D4 is coupled to the pin 2 of 555 timer T4, and its negative electrode is coupled to the pin 8 of 555 timer T4.The end of variable resistor R3 is coupled to pin 8 and the pin 4 of 555 timer T4 via resistance R 14, and its tap is coupled to ground by capacitor C 8.Capacitor C 7 is coupled between the pin 5 and ground of 555 timer T4.The pin 3 of 555 timer T4 couples with output detection signal with the pin 5 of analog line driver PD.
Detect frequency signal generating circuit for generation of a pulse waveform signal and export analog line driver PD to, after amplifying, control detecting device SE detects the potpourri of water sample, buffer solution and medicament with a predeterminated frequency.This detection frequency signal generating circuit comprises 555 timer T3, variable resistor R9 and R10, capacitor C 5 and C6, diode D5 and D6, resistance R 8 and R11-R12.The anode of diode D5 is coupled to the pin 7 of 555 timer T3 via resistance R 8, and its negative electrode is coupled to the end of variable resistor R9, and the tap of variable resistor R9 is coupled to the pin 2 of 555 timer T3.Resistance 12 is coupled between the pin 7 and pin 4 of 555 timer T3.The anode of diode D6 is coupled to the end of variable resistor R10 via resistance R 11, and its negative electrode is coupled to the pin 7 of 555 timer T3, and the tap of variable resistor R10 is coupled to ground by capacitor C 5.The pin 5 of 555 timer T3 is coupled to ground by capacitor C 6.The pin 3 of 555 timer T3 couples to export the pulse waveform signal that aforementioned control detecting device SE detects frequency with the pin 4 of analog line driver PD.The detecting device that the pulse width of this pulse waveform is this preferred embodiment carries out the time of actual detected in working time, those skilled in the art analyze as can be known, change the length that variable-resistance resistance that 555 timer T3 couple can be adjusted this actual detected time and interval time thereof.
With reference to figure 1, this preferred embodiment to be analyzed as can be known, this preferred embodiment can move two kinds of mode of operations, and one is discontinuous mode, and one is continuous mode.Discontinuous mode be this preferred sampling pump P1, compound pump P2 that implements and P3, detecting device SE and the display DI that links to each other after operation a period of time, enter sleep state.Continuous mode is each parts of this preferred embodiment and is in running status always.Running on discontinuous mode with this preferred embodiment describes as follows:
At first mode selector switch S1 and discontinuous mode contact S11 couple, carry out step 1-intermitten service signal and produce the stage, power module PS powers to 555 timer T1, the intermitten service signal generating circuit that 555 timer T1 constitute is the dutycycle adjusted circuit, regulate the resistance size of variable resistor R3 and R5, can regulate pulsewidth and the gap size (also being measurement and the break time of this preferred embodiment) of pin 3 outputs.Pin 3 outputs first pulse waveform signal is given the pin 2 of analog line driver PD, the pin 2 of analog line driver PD is corresponding with its pin 15, the power amplification signal of pin 15 outputs first pulse waveform signal is to the coil of electromagnetic relay E1, coil electricity, the terminal C of electromagnetic relay E1 and terminal NO conducting.
Enter step 2-sample phase, 555 timer T2 start, 555 timer T2 and phase connection circuit thereof constitute monostable sampled signal generation circuit, the pin 3 output sampled signals of 555 timer T2 are given the pin 3 of analog line driver PD, the power amplification signal of pin 14 these sampled signals of output of analog line driver PD is to the coil of electromagnetic relay E3, the coil electricity of electromagnetic relay E3, terminal C and terminal NO are communicated with, sampling pump P1 operation begins sampling, and the sampling lamp L2 in parallel with sampling pump P1 lights to indicate the duty of this preferred embodiment.As shown in Figure 2, water sample enters flow measurement pond 7 via inlet channel 1 and sampling pump P1.Regulating the high level output time that variable resistor R7 resistance can be regulated 555 timer T2 pins 3, also is sampling pump P1 and sampling lamp L2 working time.Behind the output time that reaches setting, 3 outputs of 555 timer T2 pins stop, and analog line driver PD disconnects, the coil power supply of electromagnetic relay E3 stops, the terminal C of electromagnetic relay E3 and terminal NC are communicated with, and it is bright to analyze lamp L1, and sampling pump P1 stops with sampling lamp L2 power supply.
Enter the step 3-blank measure stage, also namely only measure water sample, the terminal C of electromagnetic relay E3 and terminal NC are communicated with, by the monostable detection signal generation circuit operation that 555 timer T4 and phase connection circuit thereof constitute, regulate the output time (for example being set at 3 seconds) that variable resistor R13 resistance can be regulated the pin 3 of 555 timer T4.Pin 3 output detection signals of 555 timer T4 are to the pin 5 of analog line driver PD, then the pin 12 outputs one power amplification signal of analog line driver PD is given the coil of electromagnetic relay E4 and E5, behind the coil electricity of electromagnetic relay E4 and E5, the terminal NO of electromagnetic relay E4 and E5 all connects, the detecting device SE that couples with the terminal NO of electromagnetic relay E5 brings into operation, and this moment is for measuring blank time.As shown in Figure 2, the detecting device SE of photo-electric comprises that light signal generating cell S E1 and light signal receive and converting unit SE2.After 3 seconds, pin 3 outputs of 555 timer T4 stop, and the pin 12 of analog line driver PD disconnects, and the coil power supply of electromagnetic relay E4 and E5 stops, and measures blank and finishes.
Enter the step 4-dosing stage, the terminal NC of electromagnetic relay E4 connects, electromagnetic relay E7 coil electricity, behind the electromagnetic relay E7 coil electricity, its terminal NO closure, compound pump P2 and P3 action, as shown in Figure 2, compound pump P2 and P3 begin to extract buffer solution and 7 conveyings to the traffic flow pond of DPD medicament.Simultaneously, electromagnetic relay E6 coil electricity, behind the electromagnetic relay E6 coil electricity, its terminal NO closure.
Enter step 5-chlorine residue measuring phases, the detection frequency signal generating circuit that is made of 555 timer T3 also is the dutycycle adjusted circuit, behind the electromagnetic relay E6 coil electricity, after its terminal NO closure, regulate variable resistor R9 and R10 resistance size, can regulate pulsewidth and the gap size of second pulse waveform signal of pin 3 output of 555 timer T3, the high level signal that this preferred embodiment is set pin 3 outputs of 555 timer T3 continue 1 second, then low level signal disconnects 1 second.Pin 3 these second pulse waveform signals of output of 555 timer T3 are to the pin 4 of analog line driver PD, and the pin 4 of analog line driver PD is corresponding with pin 13.The pin 13 outputs one power amplification signal of analog line driver PD is given electromagnetic relay E2, detecting device SE operation is 1 second like this, pin 3 no-outputs of 555 timer T3 after 1 second, detecting device SE stops, be periodic cycle so repeatedly, contents of residual chlorine in the simulation manual measurement flow measurement pond 7 was measured once contents of residual chlorine in the current water in namely per 1 second.
Because the effect of intermitten service signal generating circuit, the detecting device SE of this preferred embodiment finishes operation (as previously mentioned when pin 3 outputs of 555 timer T1 stop, this traffic coverage is adjustable), enter " sleep state " then, pin 3 output high level signals as 555 timer T1, repeat above-mentioned steps 1-5 again, be periodic cycle and carry out.When system is in " sleep state ", detecting device SE attonity, display DI does not have demonstration, if need to observe the chlorine residue data, then closed interruptions of sleep switch S 2 gets final product, and this moment, the pin 8 of 555 timer T3 was switched on, and detecting device SE enters the cycle for moving 1 second, disconnecting 1 second duty, as above-mentioned steps 5, control the detection of this preferred embodiment and show chlorine residue data in the current measuring cell.
If need this preferred embodiment to carry out continuous working, then mode selector switch S1 and continuous mode contact S12 are coupled and get final product, the intermitten service signal generating circuit of this sample preferred embodiment lost efficacy, and this preferred embodiment directly begins to carry out above-mentioned steps 2-5, finally remains on the state of step 4-5.
As shown in Figure 2, the output channel 2 of compound pump P2 is coupled to the output channel 5 of compound pump P3 by a three-way connection (not shown), and the output channel 5 of compound pump P3 is coupled in the mixed liquor pipeline 1 by another three-way connection (not shown).Compound pump P2 extracts buffer solution from its memory storage 3 like this, compound pump P3 mixes in output channel 5 after the DPD medicament is extracted from its memory storage 4 in advance, sampling pump P1 extracts after the water sample via pipeline 1, water sample, buffer solution, the DPD medicament fully mixes in mixed liquor pipeline 6, enter flow measurement pond 7 afterwards, mixed liquor can overflow via pipeline 8, be located at that the light signal generating cell S E1 of flow measurement pond 7 peripheries and light signal receive and converting unit SE2 carries out chlorine residue detection and photosignal conversion, at last electric signal exported to display DI.
In sum, the present invention is simple in structure, reliable, easy to carry, can be applied in chlorine residue easily and detect on-the-spot.Further, the present invention can also have multiple mode of operation, is applicable to different needs.
As known by the technical knowledge, the present invention can realize by other the embodiment that does not break away from its spiritual essence or essential feature.Therefore, above-mentioned disclosed embodiment with regard to each side, all just illustrates, and is not only.All within the scope of the present invention or the change in being equal to scope of the present invention all be included in the invention.
Claims (9)
1. online DPD chlorine residue analyser, it is characterized in that, comprise the sampling pump that extracts water sample, extract first compound pump of buffer solution, extract second compound pump of DPD medicament, detect detecting device and the control module of contents of residual chlorine in the water sample, the output channel of described first compound pump is coupled to the output channel of described second compound pump by a three-way connection, the output channel of described second compound pump is coupled to the output channel of described sampling pump by another three-way connection, and the water sample of this sampling pump, this DPD medicament of this buffer solution of this first compound pump and this second compound pump injects in the mobile measuring cell according to a certain percentage, and described control module comprises:
Sampled signal generation circuit: couple with a power module, for generation of a sampled signal;
Analog line driver: couple with described sampled signal generation circuit, receive described sampled signal and export one first power amplification signal;
First on-off circuit: couple with described analog line driver, sampling pump and power module, receive the described first power amplification signal and make described sampling pump and described power module conducting, extract water sample to start described sampling pump;
Detection signal generation circuit: couple with described first on-off circuit and described analog line driver, after described sampled signal stops, produce a detection signal, and send described detection signal to described analog line driver, described analog line driver produces one second power amplification signal;
Second switch circuit: couple with described analog line driver, detecting device and power module, be used for receiving the described second power amplification signal and make described detecting device and described power module conducting, detect the water sample that described sampling pump extracts to start described detecting device;
The 3rd on-off circuit: couple with described analog line driver, first compound pump, second compound pump, power module, described detection signal is after one schedule time of interval, described the 3rd on-off circuit is controlled described first compound pump, second compound pump and described power module conducting, injects buffer solution and DPD medicament to start in the water sample that described first compound pump, second compound pump extract to described sampling pump;
Output module: couple with described detecting device, be used for the detection data of the described detecting device of output.
2. online DPD chlorine residue analyser according to claim 1 is characterized in that, described sampled signal generation circuit comprises the one 555 timer, first variable resistor, first electric capacity, second electric capacity, first diode and one the 3rd resistance;
The anode of described first diode is coupled to the pin 2 of described the one 555 timer, and its negative electrode is coupled to the pin 8 of described the one 555 timer;
Described first a variable-resistance end is coupled to pin 8 and the pin 4 of described the one 555 timer by one the 3rd resistance, and its tap is coupled to ground by described first electric capacity;
Described second electric capacity is coupled between the pin 5 and ground of described the one 555 timer;
Pin 3 and the described analog line driver of described the one 555 timer couple to export described sampled signal.
3. online DPD chlorine residue analyser according to claim 1 is characterized in that described first on-off circuit, second switch circuit, the 3rd on-off circuit are electromagnetic relay.
4. online DPD chlorine residue analyser according to claim 1 is characterized in that, described detection signal generation circuit comprises the 2 555 timer, the second adjustable resistance, the 3rd electric capacity, the 4th electric capacity, second diode and one the 4th resistance;
The anode of described second diode is coupled to the pin 2 of described the 2 555 timer, and its negative electrode is coupled to the pin 8 of described the 2 555 timer;
One end of described the second adjustable resistance is coupled to pin 8 and the pin 4 of described the 2 555 timer by one the 4th resistance, and its tap is coupled to ground by described the 3rd electric capacity;
Described the 4th electric capacity is coupled between the pin 5 and ground of described the 2 555 timer;
Pin 3 and the described analog line driver of described the 2 555 timer couple to export described detection signal.
5. online DPD chlorine residue analyser according to claim 1 is characterized in that described control module also comprises:
Intermitten service signal generating circuit: couple with described analog line driver, for generation of one first pulse waveform signal and export described analog line driver to, so that described analog line driver produces one the 3rd power amplification signal;
The 4th on-off circuit: couple with described analog line driver, intermitten service signal generating circuit and sampled signal generation circuit, receive described the 3rd power amplification signal and control the operation of described sampled signal generation circuit.
6. online DPD chlorine residue analyser according to claim 5, it is characterized in that described intermitten service signal generating circuit comprises the 3 555 timer, the 3rd variable resistor, the 4th variable resistor, the 5th electric capacity, the 6th electric capacity, the 3rd diode, the 4th diode, first resistance, the 5th resistance and the 6th resistance;
The anode of described the 3rd diode is coupled to the pin 7 of described the 3 555 timer by the 5th resistance, and its negative electrode is coupled to the described the 3rd a variable-resistance end, and the described the 3rd variable-resistance tap is coupled to the pin 2 of described the 3 555 timer;
Described first resistance is coupled between the pin 7 and pin 4 of described the 3 555 timer;
The anode of described the 4th diode is coupled to the described the 4th a variable-resistance end by the 6th resistance, and its negative electrode is coupled to the pin 7 of described the 3 555 timer, and the described the 4th variable-resistance tap is coupled to ground by described the 5th electric capacity;
The pin 5 of described the 3 555 timer is coupled to ground by described the 6th electric capacity;
Pin 3 and the described analog line driver of described the 3 555 timer couple to export described first pulse waveform signal.
7. online DPD chlorine residue analyser according to claim 1 is characterized in that described control module also comprises:
Detect frequency signal generating circuit: couple with described analog line driver and the 3rd on-off circuit, for generation of one second pulse waveform signal and export described analog line driver to, so that described analog line driver produces one the 4th power amplification signal;
The 5th on-off circuit: couple with described analog line driver, power module and detecting device, receive described the 4th power amplification signal and control the operation of described detecting device.
8. online DPD chlorine residue analyser according to claim 7 is characterized in that,
Described detection frequency signal generating circuit comprises the 4 555 timer, the 5th variable resistor, the 6th variable resistor, the 7th electric capacity, the 8th electric capacity, the 5th diode, the 6th diode, second resistance, the 7th resistance and the 8th resistance;
The anode of described the 5th diode is coupled to the pin 7 of described the 4 555 timer by the 7th resistance, and its negative electrode is coupled to the described the 5th a variable-resistance end, and the described the 5th variable-resistance tap is coupled to the pin 2 of described the 4 555 timer;
Described second resistance is coupled between the pin 7 and pin 4 of described the 4 555 timer;
The anode of described the 6th diode is coupled to the described the 6th a variable-resistance end by the 8th resistance, and its negative electrode is coupled to the pin 7 of described the 4 555 timer, and the described the 6th variable-resistance tap is coupled to ground by described the 8th electric capacity;
The pin 5 of described the 4 555 timer is coupled to ground by described the 7th electric capacity;
Pin 3 and the described analog line driver of described the 4 555 timer couple to export described second pulse waveform signal.
9. online DPD chlorine residue analyser according to claim 5 is characterized in that described control module also comprises:
Interruptions of sleep switch: be coupled to described power module and described detection signal generation circuit, to be used for starting described detecting device when described first pulse waveform signal is in low level.
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| CN105388154A (en) * | 2015-12-16 | 2016-03-09 | 无锡吉进环保科技有限公司 | Preparation method of drinking water residual chlorine detection reagent |
| CN105548047A (en) * | 2015-12-23 | 2016-05-04 | 无锡吉进环保科技有限公司 | A detecting agent of residual chlorine in drinking water |
| US20230058190A1 (en) * | 2021-08-20 | 2023-02-23 | Watts Regulator Co. | Stabilized reagent compositions, systems and methods using the same |
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| JP3486731B2 (en) * | 1999-01-27 | 2004-01-13 | 水道機工株式会社 | Potassium iodide reagent for total residual chlorine measurement |
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| US6315950B1 (en) * | 1998-09-04 | 2001-11-13 | Hach Company | Controlling chlorination of wastewater and chloramination of drinking water |
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