WO2020179997A1 - Explosion-proof apparatus for measuring concentration of residual chlorine - Google Patents

Abstract

The present invention relates to an explosion-proof apparatus for measuring the concentration of residual chlorine, the apparatus comprising: a measurement unit including a light-emitting part and a light-receiving part and having a sample water inlet pipe through which sample water is introduced and a sample water discharge pipe through which sample water after completion of measurement is discharged; a reagent storage unit including a reagent inlet pipe so as to introduce a reagent into the measurement unit; a control unit which, after light generated by the light-emitting part passes through sample water, measures the concentration of an oxidant in the sample water on the basis of a signal received by the light-receiving part; an inlet valve and a discharge valve installed in the sample water inlet pipe and the sample water discharge pipe, respectively; and a reagent injection means installed in the reagent inlet pipe so as to control the inflow of a reagent, wherein the inlet valve, the discharge valve, and the reagent injection means are formed to have an explosion-proof encapsulation structure, whereby the maintenance of the apparatus can be conveniently performed without a need to feed air.

Description

Explosion-proof residual chlorine concentration measuring device

The present invention relates to an explosion-proof residual chlorine concentration measuring apparatus. More specifically, it relates to an explosion-proof residual chlorine concentration measuring device that can be installed in a dangerous area of a ship.

In general, cargo ships transported by sea operate one-way except for ships that reciprocate for the exchange of similar cargoes. And, at the time of return voyage after the one-way operation is fully loaded, ballast water is introduced into the ship to improve the balance, safety, and maneuverability of the ship, and the ship is sailed in a ballast state.

At this time, the ballast water is filled in one port and transported to another, where it is discharged into a new port. As described above, the release of marine organisms and pathogens contained in ballast water carried from a distant location may not only be harmful to a new environment, but also may be dangerous to both humans and animals at a new port.

The introduction of non-natural marine life into new ecosystems can have devastating effects on natural flora and fauna that may not have natural defenses against the new species. In addition, harmful bacterial pathogens such as cholera may be present in the original harbor. These pathogens can grow in ballast tanks over time and cause disease in the area from which they are released.

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

An electrolysis method is mainly used to sterilize ballast water, and the ballast water treatment system using the electrolysis method is equipped with a TRO sensor to measure the TRO of the ballast water.

Here, "TRO" is an abbreviation of "Total Residual Oxidant", which means the total residual oxidizing agent present in the ballast water, and chlorine generated through the electrolysis process oxidizes aquatic organisms in the ballast water, and the residual chlorine of the remaining chlorine Calculate by measuring the value. TRO refers to all active oxidizing agents present at this time by replacing active chlorine with an atom such as bromine when electrolyzing or disinfecting seawater or salty water.

Since the above-described TRO sensor must operate in various water quality conditions such as fresh water and sea water according to the route the ship navigates, a TRO sensor using a DPD reagent that is less sensitive to changes in water quality is mainly used.

The DPD type TRO sensor not only includes a transfer pump to inject reagents into the measuring part from the reagent container, but also includes a check valve in the supply pipe to prevent backflow when transferring reagents through the transfer pump. Complex.

In addition, in order to install the DPD type TRO sensor in the dangerous area of the ship, it must be designed to have an explosion-proof structure to prevent explosion, and must go through the certification procedure for the explosion-proof structure.

Explosion-proof structures include intrinsic safety explosion-proof, pressure explosion-proof, pressure-resistant explosion-proof, and safety amplified explosion-proof.

First, if the intrinsically safe explosion-proof structure is applied to the DPD type TRO sensor, it consumes considerable power including the solenoid valve and electronic circuit inside the TRO sensor, so when using 24V to receive the intrinsically safe explosion-proof iic class (hydrogen environment), 170mA is used. Below (in the case of a resistive load) there is a problem that it is difficult to satisfy the consumption criteria (power consumption 4.08W or less).

In the case of a pressure explosion-proof structure, a purge system that injects an inert gas must be additionally installed, and air from which moisture and oil has been removed must be injected to prevent failure, and an air vent is possible and there is little vibration. There are restrictions that must be installed on the back. In addition, there is a problem in that the price of the purge system is expensive and failure is easily generated in a ship environment.

In the case of a pressure-resistant explosion-proof structure, it is composed of a sturdy housing because it has to withstand pressure during an explosion, and since the TRO sensor device must be disassembled when replacing the DPD reagent, maintenance is inconvenient and the housing cost is high.

The present invention was conceived to solve the above problems, and in particular, an object of the present invention is to provide an explosion-proof residual chlorine concentration measuring apparatus that can be installed in a dangerous area of a ship.

An explosion-proof residual chlorine concentration measuring device according to an aspect of the present invention devised to achieve the above object includes a light-emitting unit and a light-receiving unit, a sample water inlet pipe into which sample water is introduced, and a sample water discharge pipe through which the measured sample water is discharged. The measuring unit is installed; A reagent storage unit provided with a reagent inlet pipe to introduce a reagent into the measurement unit; A controller configured to measure an oxidizing agent concentration of the number of samples based on a signal received from the light receiving unit after the light generated by the light emitting unit passes through the number of samples; Inlet valves and discharge valves respectively installed in the sample water inlet pipe and the sample water discharge pipe; And a reagent injection means installed in the reagent inlet pipe to control the inflow of the reagent, wherein the inlet valve, the discharge valve and the reagent injection means have a mold explosion-proof structure.

Here, the control unit may be configured with an intrinsically safe explosion-proof structure.

In addition, the explosion-proof residual chlorine concentration measuring apparatus further includes a driving unit for receiving a signal from the control unit and driving the inlet valve, the discharge valve, and the reagent injection means, and the driving unit may be configured with a mold explosion-proof structure.

The reagent injection means may be configured with a peristaltic pump.

In addition, the control unit is connected to the first power supply unit, a barrier or isolator is installed between the first power supply unit and the control unit, and the barrier or isolator may be installed in a safety area.

In an embodiment of the present invention, the driving unit may be connected to a second power supply unit different from the first power supply unit.

In addition, the driving unit may be configured to receive a control signal from the control unit and supply power to the inlet valve, the discharge valve, and the reagent injection means.

In an embodiment of the present invention, the measuring unit may be formed of a transparent material through which light can pass.

In addition, the light-emitting unit may be composed of a white LED, and the light receiving unit may be composed of an RGB sensor.

In addition, the reagent inlet pipe may be composed of a chemical resistant tube.

In addition, the measuring unit may be configured to measure whether the sample water is filled or not, using the RED region of the RGB sensor, and the residual chlorine concentration of the sample water, using the GREEN region of the RGB sensor.

After the inlet valve is opened, the control unit may be configured to detect that the sample water does not flow into the measuring unit after the inlet valve is opened and generate an alarm. Otherwise, it can be configured to trigger an alarm.

In addition, the control unit may control the inlet valve to be opened/closed repeatedly so that the reagent injected into the measurement unit is well mixed and the sample water is introduced into the measurement unit.

On the other hand, the explosion-proof residual chlorine concentration measuring apparatus according to another aspect of the present invention includes a measuring unit having a light emitting unit and a light receiving unit, a sample water inlet pipe through which sample water is introduced and a sample water discharge pipe through which the sample water is discharged; A reagent storage unit provided with a reagent inlet pipe to introduce a reagent into the measurement unit; A controller configured to measure an oxidizing agent concentration of the number of samples based on a signal received from the light receiving unit after the light generated by the light emitting unit passes through the number of samples; Inlet valves and discharge valves respectively installed in the sample water inlet pipe and the sample water discharge pipe; A reagent control valve installed in the reagent inlet pipe; And a vent part provided in the measuring part to maintain the natural pressure inside the measuring part, and the inlet valve, the discharge valve, and the reagent control valve may have a mold explosion-proof structure.

Here, the reagent storage unit may be installed at a higher position than the measurement unit so that the reagent is injected into the measurement unit by natural pressure.

In addition, the reagent control valve may be composed of a pinch valve.

In addition, the reagent storage unit includes a body having a storage space formed therein to store a reagent, and having an opening on one side thereof; A lid installed to be opened and closed in the opening of the body; And one end is connected to the lid, the other end is an elastic tube connected to the reagent inlet pipe; may be configured to include.

According to the present invention, the control unit is configured with an intrinsically safe explosion-proof structure, and the inlet valve, the discharge valve, and the reagent injection means are configured with a mold explosion-proof structure, thereby providing a complex explosion-proof structure in consideration of the characteristics and operability of each component.

In addition, according to the present invention, the position of the reagent storage unit is higher than that of the measurement unit so that the reagent is injected under natural pressure, thereby simplifying the structure and improving durability.

In addition, according to the present invention, by supplying the reagent at a constant pressure (natural pressure), there is an effect of maintaining a constant amount of reagent input.

In addition, according to the present invention, a tube having elasticity is connected to the lid of the reagent storage unit, and after replacing the reagent in the upright state of the reagent storage unit, the reagent is supplied while maintaining the inverted state by elasticity. By doing so, there is an effect of facilitating a reagent replacement operation.

1 is a block diagram showing an explosion-proof residual chlorine concentration measuring apparatus according to an embodiment of the present invention,

2 and 3 show a reagent control valve provided in the explosion-proof residual chlorine concentration measuring apparatus according to an embodiment of the present invention,

Figure 4 shows a barrier (barrier) provided in the explosion-proof residual chlorine concentration measuring apparatus according to an embodiment of the present invention,

Figure 5 shows an isolator (isolator) provided in the explosion-proof residual chlorine concentration measuring apparatus according to an embodiment of the present invention,

6 is a diagram showing a reagent storage unit and a measurement unit provided in the explosion-proof residual chlorine concentration measuring apparatus according to an embodiment of the present invention,

7 is a block diagram showing an explosion-proof residual chlorine concentration measuring apparatus according to another embodiment of the present invention,

Figure 8 shows a peristaltic pump provided in the explosion-proof residual chlorine concentration measuring device according to another embodiment of the present invention,

9 is a graph showing the relative responsivity of a light receiving unit provided in the explosion-proof residual chlorine concentration measuring apparatus according to embodiments of the present invention,

10 is a flow chart illustrating a method for measuring residual chlorine concentration according to embodiments of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to elements of each drawing, it should be noted that the same elements are assigned the same numerals as possible even if they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, a preferred embodiment of the present invention will be described below, but the technical idea of the present invention is not limited thereto or is not limited thereto, and may be modified and variously implemented by those skilled in the art.

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

Referring to FIG. 1, the explosion-proof residual chlorine concentration measuring apparatus 100 includes a measuring unit 110 that measures the residual chlorine concentration of sample water, and stores a reagent and then injects a reagent into the measuring unit 110. A reagent storage unit 130, a control unit 150 that generates a control signal according to the sensing information measured by the measurement unit 110, and a driving unit 170 that opens or closes the valves according to a control signal from the control unit 150 Includes.

The measurement unit 110 is installed on both side surfaces so that the light emitting unit 111 and the light receiving unit 113 face each other. In addition, the measurement unit 110 is formed of a transparent material through which light can pass, so that the light generated by the light emitting unit 111 can pass through the measurement unit 110 and reach the light receiving unit 113. .

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

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

In the measurement unit 110, a sample water inlet pipe 121 is installed to allow sample water to flow in, and a sample water discharge pipe 125 is installed to discharge sample water for which measurement has been completed.

In addition, an inlet valve 123 is installed in the sample water inlet pipe 121 and a discharge valve 127 is installed in the sample water discharge pipe 125 so that the reagent introduced from the reagent storage unit 130 reacts with the sample water. It is configured so that it can be discharged smoothly afterwards.

Explosion-proof residual chlorine concentration measuring apparatus 100 according to an embodiment of the present invention, DPD (diethyl-p-phenylende diamine) reagent among various types of devices for measuring the oxidizing agent injected into the ballast water to measure the ballast water The method of measuring the concentration of residual oxidizing agent by reacting is applied.

Such a DPD-type TRO measuring device has a reagent storage unit 130 for storing the DPD reagent because the DPD reagent is added to measure the oxide concentration after collecting a part of the treated ballast water. . The DPD reagent is mixed with a buffer solution and injected into the measurement unit 110. Although the DPD reagent and the Buffer solution may be mixed and stored in one container, it is preferable for storage to be stored in separate containers.

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

Explosion-proof residual chlorine concentration measurement apparatus 100 according to an embodiment of the present invention, the reagent storage unit 130 is installed at a higher position than the measurement unit 110 so that the reagent is injected into the measurement unit 110 by natural pressure do.

In addition, a reagent inlet pipe 141 is installed between the reagent storage unit 130 and the measurement unit 110 so that the DPD reagent stored in the reagent storage unit 130 is smoothly supplied to the measurement unit 110 containing the sample water. , A reagent control valve 143 may be installed in the reagent inlet pipe 141 to control the inflow flow of the reagent.

As shown in FIG. 1, a plurality of reagent storage units 130 may be provided. By configuring to store reagents in both the first reagent storage unit 130a and the second reagent storage unit 130b, even if all of the reagents in the first reagent storage unit 130a are consumed, the second reagent storage unit 130b Since the reagent can be supplied through ), continuous reagent supply becomes possible.

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

On the other hand, the explosion-proof residual chlorine concentration measuring apparatus 100 according to an embodiment of the present invention includes an inlet valve 123, a discharge valve 127 and reagent control valves 143a and 143b. It can be configured in a molded explosion-proof structure to have an explosion-proof structure that can be installed on.

Here, the mold explosion-proof (encapsulation) structure is to prevent contact with the dangerous explosive gas itself by surrounding the electrical part where sparks may occur with a compound. The compound is made into a solid state by cold curing a thermosetting, thermoplastic, or epoxy resin, and the temperature range of the compounds is the maximum of the explosion-proof residual chlorine concentration measuring device 100. Design to be higher than the operating temperature.

When the inlet valve 123, the discharge valve 127, and the reagent control valves 143a and 143b are configured as solenoid valves, the power consumption of the solenoid valve is 2W or more, and therefore exceeds 8W when four valves are simultaneously operated. It becomes impossible to meet the standards of intrinsically safe explosion-proof structures. Therefore, when the inlet valve 123, the discharge valve 127 and the reagent control valves 143a and 143b are configured as solenoid valves, the opening and closing operation is not performed directly by the valve, but can be performed by the control unit 150. It is desirable to design a molded explosion-proof structure, which is a sealed explosion-proof structure.

Here, the reagent control valve 143 may be configured as a pinch valve, as shown in FIGS. 2 and 3. The reagent control valve 143 consisting of a pinch valve is a device that adjusts the opening and closing of the valve while pressing the elastic body 145 with two bars (Bars, 144) up and down, and the fluid to be transferred is only inside the elastic body 145. Since the valve and reagent do not come into contact with the valve, there is no fear of corrosion of the valve, and durability is improved so that maintenance and repair costs can be minimized.

In the explosion-proof residual chlorine concentration measuring apparatus 100 according to an embodiment of the present invention, an air vent (not shown) may be formed in at least one of the measuring unit 110 and the reagent storage unit 130 of FIG. 1. . Through this, the pressure applied to the measurement unit 110 is maintained at a natural pressure, and reagents and sample water can be smoothly introduced and discharged. In this way, by supplying the reagent at a constant pressure (natural pressure), the input amount of the reagent can be kept constant.

Here, the air vent unit (not shown) may be formed in the shape of a vent hole, but is configured to perform the function of the air vent through the overflow pipe 160 connected to the measuring unit 110 as shown in FIG. 1. You may.

At this time, the overflow pipe 160 can simultaneously perform an overflow function and an air vent function to discharge when the number of samples in the measurement unit 110 overflows. The overflow pipe 160 is preferably connected to the upper end of the measuring unit 110 so that the overflow pipe 160 performs an air vent function well.

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

Here, the control unit 150 can generate an alarm by detecting that the sample water does not flow into the measurement unit 110 after the inlet valve 123 is opened and the sample water does not fill, and the measurement after the discharge valve 127 is opened. 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 while the measurement unit 110 is empty, stores the amount of light measured by the light receiving unit 113, and determines whether or not water is filled based on this. That is, when the amount of light becomes weaker than a certain amount, it is determined that the number of samples is filled. In addition, even when the number of samples is empty, if the amount of light is weakened for a certain amount or more, it is determined that the measurement unit 110 is contaminated.

In addition, the control unit 150 may generate a control signal to repeat the opening/closing operation of the inlet valve 123 so that the reagent injected into the measurement unit 110 is well mixed.

In the embodiment of the present invention, the control unit 150 is composed of a PCB electronic circuit to reduce power consumption, as well as to display a control screen and to be accessible to the operator in a configuration requiring control operation. It cannot be used and is preferably constructed with an intrinsically safe explosion-proof structure.

Meanwhile, the explosion-proof residual chlorine concentration measuring apparatus 100 receives a control signal from the control unit 150 and drives the inlet valve 123, the discharge valve 127, and the reagent control valves 143a and 143b. It may further include.

Here, the driving unit 170 is not only difficult to meet the criteria of the intrinsically safe explosion-proof structure due to its high power consumption, and the operation of the driving unit 170 can be performed by the control unit 150. It is desirable.

In the embodiment of the present invention, the explosion-proof residual chlorine concentration measuring apparatus 100 is provided with a means for supplying power to the control unit 150 and the driving unit 170.

In the embodiment of FIG. 1, the control unit 150 is connected to the first power supply unit 181, and a barrier 190 is installed between the first power supply unit 181 and the control unit 150.

The barrier 190 is not installed inside the explosion-proof residual chlorine concentration measuring device 100, which is a dangerous area, but is installed outside the explosion-proof residual chlorine concentration measuring device 100, which is a safety zone.

Figure 4 shows a barrier (barrier) provided in the explosion-proof residual chlorine concentration measuring apparatus according to an embodiment of the present invention.

The barrier 190 used in the present invention is installed in a safety area and serves to control electric energy supplied from the safety area to the dangerous area to send only an electrical level to the dangerous area so that no explosion occurs.

The barrier 190 may constitute a circuit with a Zener diode or a shunt diode. In the example of FIG. 4, the resistor 191 and the fuse 193 are connected in series, and the Zener diode 195 It is configured by connecting with a reverse bias.

Here, a plurality of Zener diodes 195 are connected in parallel in order to secure a fault tolerance capable of continuing operation even in the event of a failure.

Meanwhile, in the present invention, the electric energy supplied to the danger zone may be adjusted by applying a galvanic isolator in place of the barrier 190.

FIG. 5 shows an isolator provided in the explosion-proof residual chlorine concentration measuring apparatus according to an embodiment of the present invention. In the example of FIG. 5, the isolator 290 connects a resistor 291 and a fuse 293 in series. It is configured by connecting to and connecting the diode 295.

The isolator 290, unlike the barrier 190, is configured such that there is no physical connection including the insulating layer 297, as shown in FIG. 5, and is installed in the safety area, so that the dangerous water level flowing from the safety area to the danger area It plays a role of blocking the electrical energy of The barrier 190 including the Zener diode 195 of FIG. 4 is a method in which the safety zone and the danger zone share the same ground, so a fault current generated in the safety zone prevents damage to the main earth. Since a high level of grounding is required, the isolator 290 of FIG. 5 has the advantage of not having such grounding.

Meanwhile, in the embodiment of FIG. 1, the driving unit 170 is connected to the second power supply unit 183, which is different from the first power supply unit 181.

Here, the driving unit 170 receives the control signal from the control unit 150 and transfers the power supplied from the second power supply unit 183 to the inlet valve 123, the discharge valve 127 and the reagent control valves 143a and 143b. By supplying, each valve can be opened and closed automatically.

The first power supply unit 181 and the second power supply unit 183 are installed outside the explosion-proof residual chlorine concentration measuring apparatus 100 which is a safe area.

6 shows a reagent storage unit and a measurement unit provided in the explosion-proof residual chlorine concentration measuring apparatus according to an embodiment of the present invention.

Referring to FIG. 6, the reagent storage unit 130 is installed at a position higher than the measurement unit 110 and injects a reagent into the measurement unit 110 by natural pressure.

The reagent storage unit 130 has a storage space formed therein to store reagents in a cylindrical shape, a body 131 having an opening on one side, and a lid installed to be opened and closed at an opening of the body 131 ( 133).

In addition, the reagent storage unit 130 may include an elastic tube 135 having one end connected to the lid 133 and the other end connected to the reagent inlet pipe 141.

Here, a support 137 may be included between the elastic tube 135 and the reagent inlet pipe 141.

The elastic tube 135 is connected through the connecting portion of the lid 133 and the support 137 so that the reagent can be injected through the elastic tube 135.

Explosion-proof residual chlorine concentration measuring apparatus 100 according to an embodiment of the present invention, it is possible to easily perform a reagent replacement operation through such a spring-type elastic tube 135. In other words, by connecting the elastic tube 135 to the lid 133 of the reagent storage unit 130 to replace the reagent while the reagent storage unit 130 is upright, the reagent storage unit ( 130) is maintained in an inverted state by elasticity and a reagent is supplied.

On the other hand, the amount of reagents supplied from the reagent storage unit 130 is determined by adjusting the opening time of the reagent control valve 143. In addition, since the input amount of the reagent is pressurized by natural pressure, it is supplied constantly.

On the other hand, Figure 7 is a block diagram showing an explosion-proof residual chlorine concentration measuring apparatus according to another embodiment of the present invention. Description of the components having the same reference numerals as in FIG. 1 is the same as in FIG. 1 and thus will be omitted.

In the embodiment shown in FIG. 7, the explosion-proof residual chlorine concentration measuring apparatus 200 includes a reagent injection means in place of the reagent control valve 143 included in the embodiment of FIG. 1.

The reagent injection means is configured to pressurize a reagent and inject it into the measuring unit 110, and in one embodiment of the present invention, a reagent injection means is constituted by a peristaltic pump 243a, 243b.

When the peristaltic pumps 243a and 243b are installed, it is not necessary to install the reagent storage unit 130 at a higher position than the measurement unit 110 because it generates a suction force by itself while forming a vacuum. The specific operation of the peristaltic pumps 243a and 243b will be described later.

The driving unit 170 receives a signal from the control unit 110 and drives the inlet valve 123, the discharge valve 127, and the peristaltic pumps 243a and 243b, which are reagent injection means.

Here, it is preferable that the driving unit 170 is configured in a mold explosion-proof structure for the same reason as described in the embodiment of FIG. 1.

In addition, the driving unit 170 receives the control signal from the control unit 150 and supplies the power supplied from the second power supply unit 183 to the peristaltic pumps 243a and 243b so that the peristaltic pumps 243a and 243b can be operated. do.

In this embodiment, when the inlet valve 123 and the discharge valve 127 are composed of solenoid valves, and the reagent injection means is composed of peristaltic pumps 243a and 243b, the power consumption is large, thus setting the standard of the intrinsically safe explosion-proof structure. You become unsatisfied. Therefore, the inlet valve 123, the discharge valve 127 and the peristaltic pumps 243a and 243b are not directly performed by the valve or pump, but can be performed by the control unit 150, so that the mold having a sealed explosion-proof structure It is desirable to design with an explosion-proof structure.

8 shows a peristaltic pump provided in an explosion-proof residual chlorine concentration measuring device according to another embodiment of the present invention. Referring to this, the peristaltic pump 243 is a roller that is rotatably installed inside the housing 246 244 and a tube 245 installed outside the roller 244, formed by forming a vacuum inside the tube 245 while pressing the tube 245 by rotating the roller 244 The fluid is moved to the vacuum part.

Here, since the peristaltic pump 243 is configured to close the tube 245 in a stopped state like a pinch valve, it is not necessary to install a separate check valve, and it generates a suction force by itself while forming a vacuum. There is an advantage in that a separate pressurizing means for supplying the reagent stored in the storage unit 130 is not required. In addition, since the driving current of the peristaltic pump 243 is small, it can be applied to the intrinsically safe explosion-proof standard, and since a certain amount of reagent is injected when the roller 244 rotates once, quantitative injection is possible.

9 is a graph showing the relative responsivity of a light receiving unit provided in the explosion-proof residual chlorine concentration measuring apparatus according to exemplary embodiments of the present invention.

Referring to FIG. 9, the relative reactivity of the red, green, and blue regions varies depending on the wavelength.For example, the red region increases the relative reactivity at a wavelength of about 750 nm, and the green region increases the relative reactivity at a wavelength of about 560 nm. Able to know.

The measuring unit 110 of the present invention uses the graph of FIG. 9 to measure whether the number of samples is filled or not using the RED area of the RGB sensor, and the residual chlorine concentration of the sample number is the GREEN area of the RGB sensor. It can be measured using

That is, when the measurement unit 110 is empty, the light emitting unit 111 is turned on, and the light receiving unit 113 stores the amount of light measured in the RED (about 750 nm wavelength) area, and is set as the reference value of the filling or not, and the measurement unit 110 In a state filled with water, a reagent is added to the sample water, the light emitting unit 111 is turned on, and then the amount of light is measured using the GREEN region (560 nm wavelength) of the light receiving unit 113.

10 is a flow chart showing a method for measuring residual chlorine concentration according to an embodiment of the present invention. In addition, the method for measuring residual chlorine concentration of the present invention uses the explosion-proof residual chlorine concentration measuring apparatuses 100 and 200 disclosed in FIGS. 1 and 7.

1, 7, and 10, in the method for measuring the residual chlorine concentration according to an embodiment of the present invention, first, the inlet valve 123 and the discharge valve 127 are opened to bypass the number of samples (S110). ). The bypassed sample water cleans the sample water inlet pipe 121, the sample water discharge pipe 125, and the sample water inlet space of the measurement unit 110.

Next, the discharge valve 127 is closed to fill the measuring unit 110 with sample water (S120). Whether the number of samples is filled or not is determined by turning on the light-emitting unit 111 and then measuring the amount of light in the light-receiving unit 113. When the sample water of a predetermined volume is filled, the inlet valve 123 is closed.

Then, a reference point is set by measuring the absorbance of the sample water without injecting a reagent into the filled sample water (S130). This reference point becomes the reference absorbance.

Thereafter, the discharge valve 127 is opened to discharge the sample water for which the reference absorbance measurement has been completed from the measurement unit 110, and after the discharge is completed, the discharge valve 127 is closed so that a new sample water is injected into the measurement unit 110. Do (S140).

At this time, in order to confirm the completion of the discharge of the sample water, the absorbance is measured by the measurement unit 110. Even after the discharge is confirmed, the discharge valve 127 is left open and closed for several seconds to ensure the number of samples. To be discharged. Through this operation, it is possible to reduce measurement errors.

In addition, when the new sample water is injected into the measurement unit 110 in the sample number replacement step (S140), the inlet valve 123 is opened to fill the sample water. Whether the sample water is filled or not is determined by the measurement unit 110 Check by absorbance. And, when filling the sample water, the opening/closing of the inlet valve 123 is repeatedly operated. For example, the sample water is opened for about 0.5 seconds and then closed for about 0.5 seconds so that the sample water flows into the measurement unit 110 while forming a vortex. Through this operation, the incoming reagent is well mixed.

Next, a reagent is injected into the replaced sample water (S150), and the color absorbance is measured by the measuring unit 110 (S160).

Here, in the step of injecting the reagent (S150), the reagent control valve 143 is opened for a short time in order to inject a trace amount of reagent after the initial opening/closing operation of the inlet valve 123 is performed 2-3 times and then closed. By doing so, while the vortex is formed as described above, the reagent is well mixed in the measurement unit 110.

Thereafter, the control unit 150 converts the residual chlorine concentration based on the measured reference absorbance and color absorbance (S170). In other words, when measuring the reference absorbance, the number of samples without a reagent is measured, and when the color absorbance is measured, the difference in the amount of light is calculated by measuring the amount of light in the number of samples injected with the reagent. Converted to residual chlorine concentration. As an example of the conversion formula, the residual chlorine concentration is obtained by multiplying the light intensity difference value by the value a. The a value is determined by the LED as the light emitting unit 111, the transmittance of the measuring unit 110, and the RGB sensor as the light receiving unit 113. All. After mixing the reagents, since the number of samples develops color, the light absorption power is generated and the light quantity value measured by the light receiving unit 113 is weakened. However, the higher the residual chlorine concentration, the more color is developed and the light quantity value decreases. If there is no color development after mixing the reagents, the amount of light that is the same as the standard amount of light is measured, and there is no difference, so the residual chlorine concentration is zero.

Next, the sample water for which the residual chlorine concentration measurement is completed is discharged while the discharge valve 127 is opened (S180).

Thereafter, in order to measure the residual chlorine concentration of the new sample water, a repeat operation is performed again from the step (S110) of bypassing the sample water.

As described above, the explosion-proof residual chlorine concentration measuring apparatus 100 and 200 according to an embodiment of the present invention comprises the control unit 160 in an intrinsically safe explosion-proof structure, and the driving unit 170, the inlet valve 123, and the discharge valve 127 , Reagent control valves (143a, 143b) and peristaltic pumps (243a, 243b) are formed in a molded explosion-proof structure, so there is no need for separate air input into the explosion-proof residual chlorine concentration measuring device (100, 200), and a complex explosion-proof structure that is convenient for maintenance. It will be able to provide.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the technical field to which the present invention belongs can make various modifications, changes, and substitutions within the scope not departing from the essential characteristics of the present invention. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings. . The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

Claims (18)

1. A measuring unit having a light emitting unit and a light receiving unit, and having a sample water inlet pipe through which sample water is introduced and a sample water discharge pipe through which the measured sample water is discharged;

   A reagent storage unit provided with a reagent inlet pipe to introduce a reagent into the measurement unit;

   A controller configured to measure an oxidizing agent concentration of the number of samples based on a signal received from the light receiving unit after the light generated by the light emitting unit passes through the number of samples;

   Inlet valves and discharge valves respectively installed in the sample water inlet pipe and the sample water discharge pipe; And

   Including; reagent injection means installed in the reagent inlet pipe to control the introduction of the reagent,

   The inlet valve, the discharge valve and the reagent injection means are explosion-proof type residual chlorine concentration measuring device composed of a mold explosion-proof structure.
2. The method according to claim 1,

   Explosion-proof residual chlorine concentration measuring device,

   Further comprising a driving unit for receiving a signal from the control unit to drive the inlet valve, the discharge valve and the reagent injection means,

   Explosion-proof residual chlorine concentration measuring device, the driving unit is configured with a mold explosion-proof structure.
3. The method according to claim 2,

   The reagent injection means,

   Explosion-proof residual chlorine concentration measuring device composed of a peristaltic pump.
4. The method of claim 3,

   The control unit,

   Connected to the first power supply,

   A barrier or a galvanic isolator is installed between the first power supply and the control unit,

   A barrier or isolator is an explosion-proof residual chlorine concentration measuring device installed in a safe area.
5. The method of claim 4,

   The driving part,

   Explosion-proof residual chlorine concentration measuring device, which is connected to a second power supply unit different from the first power supply unit.
6. The method of claim 5,

   The driving part,

   Explosion-proof residual chlorine concentration measuring apparatus, configured to supply power to the inlet valve, the discharge valve, and the reagent injection means by receiving a control signal from the controller.
7. A measuring unit having a light emitting unit and a light receiving unit, and having a sample water inlet pipe through which sample water is introduced and a sample water discharge pipe through which the measured sample water is discharged;

   A reagent storage unit provided with a reagent inlet pipe to introduce a reagent into the measurement unit;

   A controller configured to measure an oxidizing agent concentration of the number of samples based on a signal received from the light receiving unit after the light generated by the light emitting unit passes through the number of samples;

   Inlet valves and discharge valves respectively installed in the sample water inlet pipe and the sample water discharge pipe;

   A reagent control valve installed in the reagent inlet pipe; And

   Includes; a vent provided in the measurement unit so that the inside of the measurement unit maintains the natural pressure,

   Inlet valve, discharge valve, and reagent control valve are explosion-proof type residual chlorine concentration measuring device composed of mold explosion-proof structure.
8. The method of claim 7,

   The reagent storage unit,

   Explosion-proof residual chlorine concentration measuring device installed at a higher position than the measuring part so that the reagent is injected into the measuring part by natural pressure.
9. The method according to claim 1 or 7,

   The control unit,

   Explosion-proof residual chlorine concentration measuring device composed of intrinsically safe explosion-proof structure.
10. The method according to claim 1 or 7,

    The measurement unit,

    Explosion-proof residual chlorine concentration measuring device formed of a transparent material through which light can pass.
11. The method according to claim 1 or 7,

    The light emitting part is composed of white LEDs,

    Explosion-proof residual chlorine concentration measuring device consisting of an RGB sensor in the light receiving unit.
12. The method according to claim 1 or 7,

    The reagent inlet pipe,

    Explosion-proof residual chlorine concentration measuring device composed of chemical-resistant tubes.
13. The method of claim 8,

    The reagent control valve,

    Explosion-proof residual chlorine concentration measuring device composed of a pinch valve.
14. The method of claim 8,

    The reagent storage unit,

    A body having a storage space formed therein to store a reagent and having an opening on one side thereof;

    A lid installed to be opened and closed in the opening of the body; And

    One end is connected to the lid, the other end is an elastic tube connected to the reagent inlet pipe; Containing, explosion-proof residual chlorine concentration measuring device.
15. The method according to claim 1 or 7,

    The measurement unit,

    Whether the sample water is filled or not is measured using the RED area of the RGB sensor,

    Explosion-proof residual chlorine concentration measuring device, configured to measure the residual chlorine concentration in the sample water using the green area of the RGB sensor.
16. The method according to claim 1 or 7,

    The control unit,

    Explosion-proof residual chlorine concentration measuring device that generates an alarm by detecting that the sample water does not flow if the sample water is not filled in the measurement unit after the inlet valve is opened.
17. The method according to claim 1 or 7,

    The control unit,

    Explosion-proof residual chlorine concentration measuring device that generates an alarm when the sample water of the measuring unit is not discharged after the discharge valve is opened.
18. The method according to claim 1 or 7,

    The control unit,

    Explosion-proof residual chlorine concentration measuring device that controls the inlet valve to be opened/closed repeatedly so that the reagent injected into the measurement unit is well mixed and the sample water flows into the measurement unit

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