KR102143278B1 - Explosion proof TRO measuring apparatus - Google Patents

Abstract

The present invention relates to an explosion-proof residual chlorine concentration measuring apparatus, comprising: a measuring unit having a light emitting unit and a light receiving unit, a sample water inlet pipe into which the 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 tube to inject a reagent into the measurement unit; And a control unit for measuring the concentration of the oxidizing agent in the sample water based on a signal received from the light receiving unit after the light generated by the light emitting unit has passed through the sample water; including, inlet valve and discharge in the sample water inlet pipe and the sample water discharge pipe Each valve is installed, a reagent control valve is installed in the reagent inlet pipe, and the inlet valve, discharge valve, and reagent control valve are composed of pneumatic valves, thereby satisfying the intrinsic safety and explosion protection standards and There is an effect that can be installed.

Description

Explosion-proof residual chlorine concentration measuring apparatus {Explosion proof TRO measuring apparatus}

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 cargo. And, at the time of return voyage after 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 may also 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 aforementioned species present in the ballast water.

The 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 in seawater or salt-containing water when electrolysis or chlorine disinfection is replaced by an atom such as bromine instead of active chlorine, and various types of oxidizing agents coexist.

Since the above-described TRO sensor needs to 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 water quality changes 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 authentication procedure for the explosion-proof structure.

Explosion-proof structures include intrinsic safety explosion-proof, pressure explosion-proof, pressure-resistant explosion-proof, safety-enhanced explosion-proof, and mold 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 in 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 a place with low 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 explosion, and since the TRO sensor device must be disassembled when replacing the DPD reagent, maintenance is inconvenient and the housing cost is high.

Korean Registered Patent Publication No. 10-1722718

The present invention was conceived to solve the above problems, and in particular, it is an object of the present invention 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 apparatus according to an embodiment of the present invention devised to achieve the above object includes a light emitting part and a light receiving part, a sample water inlet pipe into which the sample water is introduced, and the number of samples from which the measured sample water is discharged. Measurement unit to which the discharge pipe is installed; A reagent storage unit provided with a reagent inlet tube to inject a reagent into the measurement unit; And a control unit for measuring the concentration of the oxidizing agent in the sample water based on a signal received from the light receiving unit after the light generated by the light emitting unit has passed through the sample water; including, inlet valve and discharge in the sample water inlet pipe and the sample water discharge pipe Each valve is installed, a reagent control means is installed in the reagent inlet pipe, and the inlet valve and the discharge valve are composed of a pneumatic valve.

In an embodiment of the present invention, the reagent control means may be configured as a pneumatic valve or a peristaltic pump.

Here, the pneumatic valve is configured to be driven by an air control valve.

In addition, the pneumatic valve may be installed in the danger zone, and the air control valve may be installed in the safety zone.

Explosion-proof residual chlorine concentration measuring apparatus according to an embodiment of the present invention, the measuring unit may be provided with a vent (Vent).

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

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

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

In addition, the reagent control valve may be configured as a pinch valve.

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

Meanwhile, in the explosion-proof residual chlorine concentration measuring apparatus according to an embodiment of the present invention, a plurality of reagent storage units may be provided.

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 an elastic tube having one end connected to the lid and the other end connected to the reagent inlet pipe.

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, if the sample water is not filled in the measurement unit, the control unit can determine that the sample water does not flow and generate an alarm.After the discharge valve is opened, if the sample water in the measurement unit is not discharged, an alarm is generated. Can be configured to

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.

According to the present invention, there is an effect of satisfying the intrinsically safe explosion-proof structure by minimizing power consumption by applying a pneumatic valve.

In addition, according to the present invention, by applying a peristaltic pump, power consumption is minimized, and reagents can be supplied quantitatively without requiring a separate pressurizing means.

In addition, according to the present invention, by increasing the position of the reagent storage unit than the measurement unit so that the reagent is injected under natural pressure, the structure is simplified and durability is improved.

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 an 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 is a block diagram showing an explosion-proof residual chlorine concentration measuring apparatus according to another embodiment of the present invention,
3 and 4 show a reagent control valve provided in the explosion-proof residual chlorine concentration measuring apparatus according to an embodiment of the present invention,
Figure 5 shows a peristaltic pump provided in the explosion-proof residual chlorine concentration measuring device 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 graph showing the relative responsivity of a light receiving unit provided in the explosion-proof residual chlorine concentration measuring apparatus according to an embodiment of the present invention,
8 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 of all, 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, 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, a preferred embodiment of the present invention will be described below, but 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 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 for measuring the residual chlorine concentration of sample water, and a reagent for storing the reagent and injecting the reagent to the measuring unit 110. It includes a reagent storage unit 130 and a control unit 150 for opening or closing valves according to the sensing information measured by the measurement unit 110.

The measurement unit 110 is installed so that the light emitting unit 111 and the light receiving unit 113 face each other on both side surfaces. 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 composed 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 with DPD, and have the advantage of being able to cope with all kinds of reagents that develop 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.

The measuring unit 110 is provided with a sample water inlet pipe 121 to allow the sample water to flow in, and a sample water discharge pipe 125 to discharge the measured sample water.

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 the various types of devices for measuring the oxidizing agent injected into the ballast water to measure the ballast water It reacts to and measures the concentration of residual oxidizing agent.

Such a DPD-type TRO measuring device has a reagent storage unit 130 for storing DPD reagents as a component because a portion of the treated ballast water is collected and DPD reagents are added to measure the concentration of oxides. . 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 inlet 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 the reagents in one first reagent storage unit 130a are consumed, the second reagent storage unit is preliminarily used. Since the reagent can be supplied through (130b), 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. Power consumption can be minimized by using a pneumatic valve instead of a solenoid valve.

That is, 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 driven. Therefore, the standard of intrinsically safe explosion-proof structure cannot be satisfied. However, since the pneumatic valve applied to the present invention can be driven with 0.5W or less, it is possible to control the valve drive with less than 2W, so that the standard of intrinsically safe explosion-proof structure Will be able to satisfy.

Here, the reagent control valves 143a and 143b, the inlet valve 123 and the discharge valve 127 are driven by the first to fourth air control valves 153a, 153b, 155 and 157, and the first to fourth air When the control valves 153a, 153b, 155 and 157 are opened, air is configured to be driven while pressing the reagent control valves 143a and 143b, the inlet valve 123 and the discharge valve 127.

In addition, the reagent control valve 143 may be configured as a pinch valve, as shown in FIGS. 3 to 4. 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 each other, there is no risk of corrosion of the valve, and durability is improved to minimize maintenance and repair costs.

On the other hand, in an embodiment of the present invention, it may be configured as a peristaltic pump shown in FIG. 5 by replacing the reagent control valve 143 configured as a pinch valve.

Referring to FIG. 5, the peristaltic pump 243 includes a roller 244 that is rotatably installed inside the housing 246 and a tube 245 that is installed outside the roller 244, the roller The fluid is moved to the vacuum portion formed by forming a vacuum inside the tube 245 while 244 rotates to pressurize the tube 245.

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 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, there is an effect that quantitative injection is possible.

In the explosion-proof residual chlorine concentration measuring apparatus 100 according to an embodiment of the present invention, an air vent part (not shown) may be formed in at least one of the measuring part 110 and the reagent storage part 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 part (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 part 110 as shown in FIG. 1. You may.

In this case, 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. It is preferable that the overflow pipe 160 is 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 may 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 enter the measurement unit 110, and measures after the discharge valve 125 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 repeat the opening/closing operation of the inlet valve 121 so that the reagent injected into the measurement unit 110 is well mixed.

Although not shown in FIG. 1 of the present invention, the measuring unit 110 is formed in a hollow cylindrical shape, and the direction of the sample water inlet is formed in a direction in contact with the inner wall surface so that the sample water sprayed along the inlet rotates along the inner wall surface. It can also be configured.

On the other hand, Figure 2 is a block diagram showing an explosion-proof residual chlorine concentration measuring apparatus according to another embodiment of the present invention. Descriptions of components having the same reference numerals as in FIG. 1 are the same as in FIG. 1 and thus will be omitted.

In the embodiment shown in FIG. 2, the explosion-proof residual chlorine concentration measuring apparatus 200 includes reagent control valves 143a and 143b composed of pneumatic valves, inlet valve 123, and discharge valve 127 are hazardous zones (Zone 0 or Zone 1), and the first to fourth air control valves 253a, 253b, 255, and 257 are installed in the safety zone (Zone 2).

That is, the explosion-proof residual chlorine concentration measuring apparatus 200 according to the embodiment of FIG. 2 is located in a danger zone by arranging the first to fourth air control valves 253a, 253b, 255, and 257 in a safety zone and controlling pressurized air. By configuring to control the pneumatic valve in the DPD type TRO sensor, it is possible to further reduce the power consumption in the hazardous area.

In this case, since the four air supply lines connected to the first to fourth air control valves 253a, 253b, 255, and 257 are extended and installed, the air control valve is more configured than the embodiment of FIG. 1 located inside the DPD type TRO sensor. This may be complicated, but since only the power consumption of the control unit 150 is required within the danger zone, the power consumption can be drastically reduced.

6 shows a reagent storage unit and a measurement unit provided in the explosion-proof residual chlorine concentration measuring device 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 includes a body 131 having a cylindrical shape and a storage space therein to store reagents, and having an opening on one side thereof, and a lid installed to be opened and closed at the 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 connection portion of the lid 133 and the support 137 so that a 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. That is, by connecting the elastic tube 135 to the lid 133 of the reagent storage unit 130 to replace the reagent in a state in which 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.

Meanwhile, the amount of the reagent supplied from the reagent storage unit 130 is determined by adjusting the opening time of the reagent control valve 143. In addition, since the amount of reagent to be charged is pressurized by natural pressure, it is constantly supplied.

In the embodiment of the present invention, in the case where the peristaltic pump 243 of FIG. 5 is installed in place of the reagent control valve 143, it is necessary to generate a suction force by itself while forming a vacuum as described above. It is not necessary to install the storage unit 130 at a higher position than the measurement unit 110.

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

Referring to FIG. 7, 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. 7 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) region, 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 part 111 is turned on, and then the amount of light is measured using the GREEN area (560 nm wavelength) of the light receiving part 113.

8 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 2.

1, 2 and 8, 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 sample water (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 measuring 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 is 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, the absorbance is measured by the measurement unit 110 to confirm the completion of the discharge of the sample water. 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 color absorbance is measured by the measuring unit 110 (S160).

Here, in the step of injecting the reagent (S150), after the opening/closing operation of the inlet valve 123 is initially performed 2-3 times, the reagent control valve 143 is opened for a short time and then closed in order to inject a trace amount of reagent. 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). That is, when measuring the reference absorbance, the number of samples without a reagent is measured, and when measuring the color absorbance, 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 concentration of residual chlorine 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 part 111, the transmittance of the measuring part 110, and the RGB sensor as the light receiving part 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 development 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, the repeating 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 according to an embodiment of the present invention minimizes power consumption by applying a pneumatic valve or a peristaltic pump, thereby satisfying the standards of an intrinsically safe explosion-proof structure. It has the effect of allowing it to be installed in the dangerous area of the ship.

In addition, the explosion-proof residual chlorine concentration measuring apparatus 100 according to an embodiment of the present invention has a structure in which a reagent is pressurized and injected by natural pressure, so that a separate pressurizing means (for example, a pump) and a check valve, etc. Since this configuration is not required, durability is improved, maintenance becomes easier, and the amount of reagents is kept constant, thereby enabling quantitative supply of reagents.

In the embodiment of the present invention, the reagent control means has been described to be composed of a pneumatic valve or a peristaltic pump, but the present invention is not limited thereto, and various control devices capable of driving by low power satisfying the intrinsic safety explosion-proof standard can be applied. to be.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications, changes, and substitutions without 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 the technical idea, 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 construed as being included in the scope of the present invention.

100: explosion-proof residual chlorine concentration measuring device
110: measuring unit
111: light emitting unit
113: light receiving unit
121: sample water inlet pipe
123: inlet valve
125: sample water discharge pipe
127: discharge valve
130: reagent storage unit
141: reagent inlet pipe
143: reagent control valve
150: control unit
153a, 153b, 155, 157: first to fourth air control valves
243: peristaltic pump

Claims (18)

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 tube to inject a reagent into the measurement unit; And
Including; after the light generated by the light emitting unit transmits the number of samples, the control unit measures the concentration of the oxidizing agent in the number of samples based on a signal received from the light receiving unit,
Inlet valve and discharge valve are respectively installed in the sample water inlet pipe and the sample water discharge pipe,
Reagent control means is installed in the reagent inlet pipe,
The inlet valve and discharge valve are composed of a pneumatic valve,
The pneumatic valve,
Driven by an air control valve,
The pneumatic valve is installed in the danger area,
The air control valve is an explosion-proof residual chlorine concentration measuring device installed in a safe or dangerous area.
The method according to claim 1,
Reagent control means,
Explosion-proof residual chlorine concentration measuring device consisting of a pneumatic valve.
The method according to claim 1,
Reagent control means,
Explosion-proof residual chlorine concentration measuring device composed of a peristaltic pump.
delete delete delete The method according to claim 1,
Explosion-proof residual chlorine concentration measuring device provided with a vent part in the measurement part.
The method according to claim 7,
The reagent storage unit,
Explosion-proof residual chlorine concentration measuring device installed at a higher position than the measuring part so that reagents are injected into the measuring part by natural pressure.
The method according to claim 1,
The measurement unit,
Explosion-proof residual chlorine concentration measuring device formed of a transparent material through which light can pass.
The method according to claim 1,
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.
The method according to claim 1,
The reagent control valve,
Explosion-proof residual chlorine concentration measuring device composed of a pinch valve.
The method according to claim 1,
The reagent inlet pipe,
Explosion-proof residual chlorine concentration measuring device composed of chemical-resistant tubes.
The method according to claim 1,
The reagent storage unit,
Explosion-proof residual chlorine concentration measuring device provided with a plurality.
The method according to claim 1,
The reagent storage unit,
A body having a storage space formed therein to store a reagent, and having an opening at 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.
The method of claim 9,
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.
The method according to claim 1,
The control unit,
Explosion-proof residual chlorine concentration measuring device that generates an alarm by detecting that sample water does not flow into the measuring unit after the inlet valve is opened.
The method according to claim 1,
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.
The method according to claim 1,
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 measuring part is well mixed and the sample water flows into the measuring part.

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