KR102125704B1 - Apparatus and method for measuring TRO - Google Patents

Abstract

The present invention relates to an apparatus for measuring residual chlorine concentration, comprising a light-emitting section and a light-receiving section, and a measuring section provided with a reagent input section formed of a single passage to inject a buffer and an indicator; First and second reagent storage units for storing buffer and indicator, respectively; One side of the two pipes are formed so as to be connected to the first and second reagent storage, respectively, the other end is formed of a single pipe reagent inlet pipe connected to the reagent input of the measurement unit; And a control unit for measuring the concentration of the oxidizing agent in the sample number based on the signal received from the light receiving unit after the light generated by the light emitting unit passes through the sample number, thereby preventing the adhesion phenomenon caused by the indicator.

Description

Residual chlorine concentration measuring device and method{Apparatus and method for measuring TRO}

The present invention relates to an apparatus and method for measuring residual chlorine concentration. More specifically, the present invention relates to an apparatus and method for measuring residual chlorine concentration so that no residual indicator remains in the reagent input section.

In general, cargo ships transported by sea are mostly one-way, except for ships that reciprocate for the interchange of similar cargoes. In addition, after returning to a full load after one-way operation, sailing is performed with ballast water introduced into the ship to improve the balance, safety, and maneuverability of the ship.

At this time, ballast water is filled in one port and transferred to another, where it is discharged into a new port. As such, the release of marine organisms and pathogens contained in ballast water carried from remote locations is not only harmful to the new environment, but can also be dangerous to both humans and animals in new ports.

The introduction of non-natural marine organisms into new ecosystems can have devastating effects on natural flora and fauna that may not have a natural defense against new species. In addition, harmful bacterial pathogens such as cholera may be present in the original port. These pathogens can multiply in the ballast tanks over time, causing disease in the areas where they are released.

The risks posed by these marine organisms and pathogens can be controlled by killing the above species present in ballast water.

The electrolysis method is mainly used to sterilize the ballast water, and the ballast water treatment system using the electrolysis method is equipped with a TRO measurement device for measuring the TRO of the ballast water.

Here, "TRO" is an abbreviation for "Total Residual Oxidant", which means the total residual oxidizing agent present in ballast water, and chlorine generated through electrolysis usually oxidizes aquatic organisms in ballast water and is used for Find the residual chlorine level. TRO is an electrolysis or chlorine disinfection of seawater or salty water, and is replaced with an atom such as bromine instead of active chlorine, so that various types of oxidizing agents coexist, indicating all active oxidizing agents present.

Since the above-described TRO measurement device has to operate in various water quality conditions such as fresh water and sea water according to the route of the vessel, it is mainly used for TRO measurement devices using DPD reagents that are less sensitive to water quality changes.

In ships, the ballast water is sterilized mainly when the ship is loaded or unloaded, and the TRO measuring device is used to measure residual chlorine by operating when sterilizing or discharging the ballast water.

However, the frequency of sterilization of ballast water is different depending on the type or size of the ship, so the frequency of use of the TRO measuring device depends not only on the installed vessel, but also while the ship is in operation, the sterilizing device is rarely used. For this reason, TRO measurement devices are often not used for a long time.

In particular, the TRO measurement device using the DPD reagent causes the following problems due to the reagent for confirming the concentration value of residual chlorine when not used for a long time.

The TRO measuring device using DPD reagent uses a method of coloring the sample by adding reagent to confirm the concentration value. At this time, two kinds of reagent are added: buffer and indicator.

However, after the reagent is added, a reagent residue remains on the reagent input side provided in the TRO measuring device. When the device is not used for a long time, the reagent residue on the reagent input portion is solidified due to the characteristics of the reagent. That is, p-toluenesulfonic acid having a property of accelerating curing is included in the components of the indicator constituting the reagent, so that the reagent residue is hardened when the device is not used.

As described above, when the TRO measuring device using the DPD reagent is not used for a long time, the reagent input portion is blocked due to the reagent adhered to the reagent input portion, and a problem in that the reagent cannot be input when the equipment is operated is required to respond to this.

Korean Patent Application No. 2009-0055123

The present invention has been devised to solve the above problems, and provides a residual chlorine concentration measuring apparatus and method for preventing residual indicators from remaining in the reagent input section in which the reagent is input in a residual chlorine concentration measuring apparatus using DPD reagent. It has its purpose.

Residual chlorine concentration measuring device according to the aspect of the present invention devised to achieve the above object is provided with a light-emitting unit and a light-receiving unit, a measuring unit provided with a reagent injection unit formed of a single passage to be injected with a buffer and an indicator; First and second reagent storage units for storing buffer and indicator, respectively; One side of the two pipes are formed so as to be connected to the first and second reagent storage, respectively, the other end is formed of a single pipe reagent inlet pipe connected to the reagent input of the measurement unit; And a control unit for measuring the oxidant concentration of the sample number based on the signal received from the light receiving unit after the light generated by the light emitting unit passes through the sample number.

Here, the first and second reagent control valves are respectively installed in the two pipes provided in the reagent inlet pipe, and the discharge ends of the first and second reagent control valves may be connected to a single pipe.

In addition, the first and second reagent control pumps are respectively installed in the two pipes provided in the reagent inlet pipe, and the discharge ends of the first and second reagent control pumps may be configured to be connected to a single pipe.

In one embodiment of the present invention, the first and second reagent storage units are each provided with at least two and positioned above the measurement unit, and the measurement unit may be provided with a vent so that the inside is maintained at atmospheric pressure.

Here, when the first or second reagent control valve is opened, the buffer solution or the indicator may be introduced into the measurement unit by atmospheric pressure.

In one embodiment of the present invention, the reagent inlet tube may be configured as a chemical resistant tube.

In addition, the measurement unit, a sample water inlet pipe and a sample water outlet pipe are connected so that the sample water is introduced/discharged, an inlet valve may be installed in the sample water inlet pipe, and an outlet valve may be installed in the sample water outlet pipe.

In addition, the measurement unit may be formed of a transparent material through which light can pass.

On the other hand, the method for measuring residual chlorine concentration according to another aspect of the present invention includes a light emitting part and a light receiving part, and a sample water inlet pipe and a sample water outlet pipe in which sample water flows in/out are connected, and the sample water inlet pipe and the sample water Inlet valve and outlet valve are respectively installed in the discharge pipe, a measuring unit provided with a reagent input unit formed of a single passage so that a buffer and an indicator are injected; First and second reagent storage units for storing buffer and indicator, respectively; Two pipes are separately formed so that one end is connected to the first and second reagent storage units respectively, and the first and second reagent control valves are respectively installed, and the other end is formed of a single pipe and connected to the reagent input unit of the measurement unit. Reagent inlet pipe; Using a residual chlorine concentration measuring device including a control unit for controlling the opening and closing of the inlet valve and the outlet valve, and the first and second reagent control valves, the measurement unit measures the absorbance of the sample number where the reagent is not injected to determine the standard absorbance. Obtaining; Discharging the sample water whose reference absorbance measurement is completed and injecting new sample water; Obtaining a color absorbance by alternately injecting a buffer and an indicator into the replaced sample number; Obtaining a residual chlorine concentration based on the standard absorbance and color absorbance; And injecting a buffer solution to remove the indicator remaining in the reagent input unit of the measurement unit.

According to the present invention, the buffer solution and the indicator are alternately charged through the single reagent input unit, and finally, the buffer does not remain in the reagent input unit. .

In addition, according to the present invention, the buffer and the indicator are configured to be input with a time difference between a single reagent input unit, and thus, when operating only one reagent control valve (or reagent control pump) when the buffer or indicator is added, operation power consumption is saved. It works.

1 is a block diagram showing a residual chlorine concentration measuring apparatus according to an embodiment of the present invention,
2 is a flow chart showing a method for measuring residual chlorine concentration according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, when adding reference numerals to the components of each drawing, it should be noted that the same components have the same reference numerals as possible even though they are displayed on different drawings. In addition, in describing the present invention, when it is determined that detailed descriptions of related well-known structures or functions may obscure the subject matter of the present invention, detailed descriptions thereof will be omitted. In addition, although preferred embodiments of the present invention will be described below, the technical spirit of the present invention is not limited to or limited thereto, and can be variously implemented by a person skilled in the art.

1 is a block diagram showing a residual chlorine concentration measuring apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the residual chlorine concentration measuring apparatus 100 includes a measuring unit 110 for measuring the residual chlorine concentration of sample water and a reagent for storing reagents and injecting reagents into the measuring unit 110. It includes first and second reagent storage units 130a and 130b, and a control unit 150 that opens or closes various valves according to sensing information measured by the measurement unit 110.

The measurement part 110 is provided so that the light emitting part 111 and the light receiving part 113 face each side part. In addition, the measuring unit 110 is formed of a transparent material through which light can pass, and is configured to allow light generated by the light emitting unit 111 to pass through the measuring unit 110 and reach the light receiving unit 113. .

Here, the light emitting unit 111 may be configured with a white LED to measure all three channel wavelength bands. In addition, the light receiving unit 113 is composed of an RGB sensor having color filters corresponding to red, green, and blue, and configured to recognize all three wavelengths. Since the three wavelength bands are checked, accuracy in measuring the concentration of the oxidant colored by DPD can be improved, and it is possible to have the advantage of being able to cope with all kinds of reagents that develop different colors with a single device.

Through this configuration, when the white LED of the light emitting unit 111 is turned on, the intensity (light amount) of the light transmitted from the RGB sensor of the light receiving unit 113 is measured to measure the residual chlorine concentration.

The measurement unit 110, the sample water inlet pipe 121 is installed so that the sample water is introduced, the sample water discharge pipe 125 is installed so that the sample water is completed measurement is discharged.

In addition, the inlet valve 123 is installed in the sample water inlet pipe 121, and the discharge valve 127 is installed in the sample water outlet pipe 125 so that the reagent introduced into the reagent storage unit 130 reacts with the sample water. It is configured to be discharged smoothly later.

Residual chlorine concentration measuring apparatus 100 according to an embodiment of the present invention, among the various types of apparatus for measuring the oxidizing agent input to the ballast water, DPD (diethyl-p-phenylende diamine) reagent to the ballast water to be measured The method of reacting and measuring the concentration of residual oxidant is applied.

The DPD-type oxidizing agent measuring device, as a component of the reagent storage means for storing the DPD reagent, since a part of the treated ballast water is collected and then the DPD reagent is input to measure the oxide concentration. In the present invention, the DPD reagent is stored in the first reagent storage unit 130a and the second reagent storage unit 130b, each of which is an indicator and a buffer solution, respectively.

In addition, the first reagent storage unit 130a and the second reagent storage unit 130b may further include a temperature maintaining means (not shown) maintained at a constant temperature to increase the reactivity of the reagent and the effective period of the reagent.

Residual chlorine concentration measuring apparatus 100 according to an embodiment of the present invention, the first reagent storage unit (130a) and the second reagent storage unit (130b) each of the indicator and buffer stored in the measurement unit containing the sample number ( The reagent inlet pipe 141 is installed between the reagent storage unit 130 and the measurement unit 110 to be supplied smoothly to 110).

Reagent inlet pipe 141, one end is formed to separate the two pipes (141a, 141b) so as to be respectively connected to the first reagent storage unit 130a and the second reagent storage unit (130b), the other end is a single pipe It is formed of (141c) is connected to the reagent input unit 110a of the measurement unit 110.

As described above, in the reagent inlet pipe 141 according to an embodiment of the present invention, the inlet end is divided into two, and the indicator and the buffer are alternately introduced at a time difference, and then the outlet end formed by one pipe is measured. It is configured to be connected to the reagent input unit (110a) formed by a single passage to the (110) to the indicator or buffer is introduced into the measurement unit (110).

Here, the first and second reagent control valves 143a and 143b are installed in the two pipes 141a and 141b provided in the reagent inlet pipe 141 so as to control the flow of the reagent, respectively, and The discharge end of the second reagent control valve (143a, 143b) may be connected to a single pipe (141c).

The first reagent storage unit 130a and the second reagent storage unit 130b included in the residual chlorine concentration measuring apparatus 100 according to an embodiment of the present invention, the measuring unit by atmospheric pressure without separate pressing means ( 110) may be configured to be positioned above the measurement unit 110 so that the reagent is introduced.

Here, the measurement unit 110 is provided with a vent (Vent, 160) that communicates with the outside air so that the inside is maintained at atmospheric pressure.

As in the above-described embodiment, when the first reagent storage unit 130a and the second reagent storage unit 130b are positioned above the measurement unit 110 and the vent 160 is provided, the first and first reagents 2 If the reagent control valve (143a, 143b) is opened, the buffer or indicator is introduced into the measurement unit 110 by atmospheric pressure without a separate pressing means.

On the other hand, as another embodiment of the present invention, although not shown, the first and second reagent control valves 143a and 143b are replaced by two pipes 141a and 141b provided in the reagent inlet pipe 141. And a second reagent control pump (not shown), respectively, and discharge ends of the first and second reagent control pumps (not shown) may be configured to be connected to a single pipe 141c.

In this case, even if the first reagent storage unit 130a and the second reagent storage unit 130b are positioned lower than the measurement unit 110, the pressing force is generated by the first and second reagent control pumps (not shown) to generate the buffer solution. Alternatively, the indicator may be introduced into the measurement unit 110.

Meanwhile, at least two of the first reagent storage unit 130a and the second reagent storage unit 130b may be provided, as illustrated in FIG. 1. By configuring the first reagent storage unit 130a and the second reagent storage unit 130b to store reagents, an indicator of one first reagent storage unit 130a or a second reagent storage unit 130b or Even if all of the buffer solution is consumed, since the indicator or buffer solution can be supplied through the first reagent storage unit 130a and the second reagent storage unit 130b that are preliminarily provided, continuous reagent supply is possible.

Here, the reagent inlet pipe 141 may be configured as a chemical-resistant tube to prevent corrosion and damage by the supplied reagent.

The reagent control valve 143 may be configured as a pinch valve (Pinch Valve). The pinch valve is a device that adjusts the opening and closing of the valve by pressing and releasing the elastic body with two bars (BAR), so that the fluid to be transferred is only in contact with the inside of the elastic body and no drive parts are in contact with the valve and reagent There is no fear of corrosion of the valve due to this non-contact, and durability is improved, thereby minimizing maintenance and repair costs.

The control unit 150 measures the residual chlorine concentration of the sample water based on the signal received from the light receiving unit 113 after the light generated by the light emitting unit 111 passes through the sample water.

Here, the control unit 150 may generate an alarm by determining that the sample number does not flow if the sample number does not fill the measurement unit 110 after the inlet valve 123 is opened, and the discharge valve 125 measures after opening If the sample water of the unit 110 is not discharged, an alarm may be generated. The control unit 150 turns on the light emitting unit 111 when the measuring unit 110 is empty, stores the amount of light measured by the light receiving unit 113, and determines whether water is charged based on this. That is, it is determined that the number of samples is filled when the amount of light weakens over a certain amount. In addition, even when the number of samples is empty, if the amount of light is weaker than a certain level, the measurement unit 110 is judged to be contaminated.

On the other hand, although not shown in Figure 1 of the present invention, the measuring unit 110 is formed in a hollow cylindrical shape, the direction of the sample water inlet is formed in a direction in contact with the inner wall surface, the number of samples injected along the inlet along the inner wall surface It can also be configured to rotate and flow.

2 is a flow chart showing a method for measuring residual chlorine concentration according to an embodiment of the present invention. In addition, the residual chlorine concentration measuring method of the present invention uses the residual chlorine concentration measuring apparatus disclosed in FIG. 1.

1 and 2, in the residual chlorine concentration measuring method according to an embodiment of the present invention, first, the inlet valve 123 and the outlet valve 127 are opened to bypass the sample number measuring unit 110 By doing so, the measurement unit 110 is flushed (S110). The sample water to be bypassed washes the sample water inlet space of the sample water inlet pipe 121, the sample water outlet pipe 125, and the measuring unit 110.

Next, the zero point measurement of the number of samples is performed (S120).

Looking at the zero point measurement process in more detail, first, the discharge valve 127 is closed to fill the sample number in the measurement unit 110. Whether or not the number of samples is filled is determined by turning on the light emitting unit 111 and measuring the amount of light in the light receiving unit 113. When the sample water of a predetermined capacity is filled, the inlet valve 123 is closed, and the absorbance of the sample water is measured without injecting reagent into the sample water to obtain a reference absorbance.

Thereafter, the discharge valve 127 is opened to discharge the number of samples whose zero point measurement has been completed from the measurement unit 110 to flush the measurement unit 110 again (S130).

Next, the number of reagent injections (N) is set to 1 (S140).

Thereafter, the discharge valve 127 is closed and the new sample water is introduced into the measurement unit 110 (S150). When the new sample water flows into the measurement unit 110, the inlet valve 123 is opened to fill the sample water. Whether or not the sample water is filled can be confirmed by the absorbance of the measurement unit 110.

Here, when the sample number is injected into the measurement unit 110, the opening/closing of the inlet valve 123 is repeatedly performed in a short time, through which the sample number flows into the measurement unit 110 while forming a vortex. When the vortex is formed, the sample number and reagent (indicator or buffer) are better mixed.

Thereafter, it is determined whether the number of reagent injections (N) is odd (S160).

As a result of the determination, when the number of injections of reagent (N) is odd, an indicator is injected into the number of samples (S170).

As a result of the determination, if the number of reagent injections N is an even number, a buffer solution is injected into the sample number (S180).

Here, the injection of the indicator or buffer, as described above, the first reagent storage unit 130a and the second reagent storage unit 130b are positioned above the measurement unit 110, and the first and second reagent control valves (143a, 143b) may be opened and injected, or may be configured to be injected through first and second reagent control pumps (not shown).

After injecting the indicator or buffer into the sample water, the number of reagent injections (N) is increased by 1 (S190).

Next, the number of reagent injections (N) is compared with the threshold (Nth) (S160).

At this time, if the number of injections of reagents is not greater than the threshold, it is performed again from the step of determining whether the number of injections of reagents (N) is odd (S160). If the number of injections of reagents is greater than the threshold, the next step is performed.

Here, the threshold value Nth can be set according to the number of injections of the indicator or buffer. For example, the threshold (Nth) may be set to 2 when the indicator or buffer is injected only once, and the threshold may be set to a value greater than 3 when the indicator and the buffer are alternately injected multiple times.

As described above, by determining whether the number of injections of reagents (N) is odd or even in the present invention, if a time difference is set in the course of injecting reagents, only one type of reagent is added from a buffer or an indicator to differ from the previously remaining reagents. Different types of reagents are alternately injected.

For example, when the reagent is injected in the order of the buffer solution and the indicator, in the next reagent injection process, the second reagent control valve 143b is opened because the indicator remains in the portion of the single pipe 141c of the reagent inlet pipe 141 Alternatively, the second reagent control pump is operated to inject a buffer solution. Through this process, the indicator remaining in the single pipe 141c of the reagent inlet pipe 141 is mixed with the newly injected buffer, and the indicator is removed, and the remaining indicator is removed.

In addition, in the process of injecting the reagent (buffer or indicator), the first and second reagent control valves 143a and 143b or the first and second reagents are used to inject similar amounts of other types of reagents in the piping filled in the previous reagent injection process. The operation time of the second reagent control pump is controlled so that the amounts of the two types of reagents are equally injected.

When both the indicator and the buffer are injected into the sample water, the residual chlorine concentration is measured (S220).

To describe the residual chlorine concentration measurement process in more detail, the measurement unit 110 measures the color absorbance of the sample water, and the control unit 150 converts the residual chlorine concentration based on the standard absorbance and the color absorbance. That is, when measuring the standard absorbance, the amount of light in the sample without the reagent is measured, and when the color absorbance is measured, the amount of light in the sample in which the reagent is injected is measured to determine the difference in the amount of light from each other, and then using the appropriate conversion formula. Converted to residual chlorine concentration. As an example of the conversion formula, multiplying the difference in the amount of light by the value of a results in the concentration of residual chlorine. The value of a is determined by the LED, which is the light emitting unit 111, the transmittance of the measurement unit 110, and the RGB sensor, which is the light receiving unit 113. All. After mixing the reagents, since the number of samples develops, the absorbance is generated, and the light quantity measured by the light receiving unit 113 becomes weak. The higher the residual chlorine concentration, the more the color develops and the light quantity decreases. If no color develops after mixing the reagent, the amount of light equal to the reference amount of light is measured, and since there is no difference, the residual chlorine concentration is zero.

Next, the sample water whose residual chlorine concentration measurement has been completed is discharged while the discharge valve 127 is opened (S230).

Next, a buffer is injected into the measurement unit 110 by opening the second reagent control valve 143b or operating a second reagent control pump (not shown) (S240).

When the buffer is injected, the indicator remaining in the reagent input unit 110a of the measurement unit 110 is removed by the buffer, and then, the residual indicator and the buffer injected into the measurement unit 110 of the measurement unit 110 It is discharged to the outside (S250).

Meanwhile, in FIG. 2, the step (S150) in which the number of samples to be measured flows into the measurement unit 110 was performed once before the injection of the reagent (indicator, buffer), but the present invention is not limited thereto.

For example, in the first sample water inflow step (S150), a part of the sample water is introduced, and after the injection steps (S170, S180) of the reagent (indicator, buffer), the remaining sample water is collected before the residual chlorine measurement step (S220). It can also be configured to add an inflow step.

In this configuration, both types of reagents are introduced into the measurement unit 110, and then the opening/closing of the inlet valve 123 is repeatedly operated in a short time to mix the sample number and the two types of reagents better. do.

As described above, the residual chlorine concentration measuring apparatus 100 according to an embodiment of the present invention is configured such that indicators and buffers are not injected at the same time, and are alternately injected over a period of time, and measured by re-injecting the buffer after the residual chlorine measurement is completed. It is possible to prevent the sticking phenomenon caused by the indicator by allowing the residue of the buffer solution to remain, without leaving the residue of the indicator in the reagent input unit 110a formed by the single passage provided in the unit 110.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains can make various modifications, changes, and substitutions without departing from the essential characteristics of the present invention. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical spirit of the present invention, but to explain the scope of the technical spirit of the present invention. . The scope of protection of the present invention should be interpreted by the claims below, and all technical spirits within the equivalent range should be interpreted as being included in the scope of the present invention.

100: residual chlorine concentration measuring device
110: measuring unit
111: light emitting unit
113: light receiving section
121: sample water inlet pipe
123: inlet valve
125: sample water discharge pipe
127: discharge valve
130a: first reagent storage
130b: second reagent storage
141: reagent inlet tube
143: reagent control valve
150: control unit

Claims (10)

A measuring unit having a light-emitting unit and a light-receiving unit, and having a reagent input unit formed of a single channel so that a buffer and an indicator are injected;
First and second reagent storage units for storing buffer and indicator, respectively;
One side of the two pipes are formed so as to be connected to the first and second reagent storage, respectively, the other end is formed of a single pipe reagent inlet pipe connected to the reagent input of the measurement unit; And
Includes a control unit for measuring the oxidant concentration of the sample number based on the signal received from the light receiving unit after the light generated by the light emitting unit passes through the sample number;
After the measurement of the oxidant concentration of the sample water is completed, the residual chlorine concentration measuring device is configured to be injected again into the measuring unit through the reagent injection unit.
The method according to claim 1,
First and second reagent control valves are respectively installed in the two pipes provided in the reagent inlet pipe,
Residual chlorine concentration measuring device, the discharge end of the first and second reagent control valve is connected to a single pipe.
The method according to claim 1,
The first and second reagent control pumps are respectively installed in the two pipes provided in the reagent inlet pipe,
Residual chlorine concentration measuring device, the discharge end of the first and second reagent control pump is connected to a single pipe.
The method according to claim 2,
The first and second reagent storage units,
At least two are each provided and positioned above the measuring unit,
Measurement unit,
Residual chlorine concentration measuring device, the vent is provided so that the inside is maintained at atmospheric pressure.
The method according to claim 4,
When the first or second reagent control valve is opened, the residual chlorine concentration measuring device, the buffer or indicator is introduced into the measuring unit by atmospheric pressure.
The method according to any one of claims 1 to 5,
The reagent inlet pipe,
Residual chlorine concentration measuring device consisting of a chemical-resistant tube.
The method according to claim 6,
Measurement unit,
The sample water inlet pipe and the sample water outlet pipe are connected so that the sample water flows in/out,
Inlet valve is installed in the sample water inlet pipe,
A residual chlorine concentration measuring device is provided with a discharge valve in the sample water discharge pipe.
The method according to claim 1,
Measurement unit,
Residual chlorine concentration measuring device formed of a transparent material through which light can pass.
It is provided with a light emitting portion and a light receiving portion, the sample water inlet pipe and sample water inlet pipe is connected to the sample water inlet and outlet, the sample water inlet pipe and the inlet valve and outlet valve is installed in the sample water outlet pipe, respectively, buffer and indicator A measuring unit provided with a reagent input unit formed of a single channel to be injected;
First and second reagent storage units for storing buffer and indicator, respectively;
Two pipes are separately formed so that one end is connected to the first and second reagent storage units, respectively, and the first and second reagent control valves are respectively installed, and the other end is formed of a single pipe and connected to the reagent input unit of the measurement unit. Reagent inlet pipe;
Residual chlorine concentration measuring device using a control unit for controlling the opening and closing of the inlet valve and the outlet valve, the first and second reagent control valve,
Obtaining a reference absorbance by measuring the absorbance of the number of samples in which the reagent is not injected in the measurement unit;
Discharging the sample water whose reference absorbance measurement is completed and injecting new sample water;
Obtaining a color absorbance by alternately injecting a buffer and an indicator into the replaced sample number;
Obtaining a residual chlorine concentration based on the standard absorbance and color absorbance; And
After obtaining the residual chlorine concentration of the sample water, the method of measuring the residual chlorine concentration comprising; removing the indicator remaining in the reagent input of the measuring unit by injecting the buffer back into the measuring unit through the reagent input unit.
It is provided with a light emitting portion and a light receiving portion, the sample water inlet pipe and sample water inlet pipe is connected to the sample water inlet and outlet, the sample water inlet pipe and the inlet valve and outlet valve is installed in the sample water outlet pipe, respectively, buffer and indicator A measuring unit provided with a reagent input unit formed of a single channel to be injected;
First and second reagent storage units for storing buffer and indicator, respectively;
Two pipes are separately formed so that one end is connected to the first and second reagent storage units respectively, and the first and second reagent control pumps are respectively installed, and the other end is formed of a single pipe and connected to the reagent input unit of the measurement unit. Reagent inlet pipe;
Residual chlorine concentration measuring device using a control unit for controlling the opening and closing of the inlet valve and the discharge valve, and the operation of the first and second reagent control pump,
Obtaining a reference absorbance by measuring the absorbance of the number of samples in which the reagent is not injected in the measurement unit;
Discharging the sample water whose reference absorbance measurement is completed and injecting new sample water;
Obtaining a color absorbance by alternately injecting a buffer and an indicator into the replaced sample number;
Obtaining a residual chlorine concentration based on the standard absorbance and color absorbance; And
After obtaining the residual chlorine concentration of the sample water, the method of measuring the residual chlorine concentration comprising; removing the indicator remaining in the reagent input of the measuring unit by injecting the buffer back into the measuring unit through the reagent input unit.

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