JPH0536208Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a device for measuring the salinity concentration of salt water, and particularly relates to an improvement in the electrode portion to be placed in the salt water.

(b) Prior art Methods for measuring the salinity of salt water include the Na ion measurement method, the electromagnetic induction method, and the conductivity method. Na
In the ion measurement method, the measurement part is susceptible to dirt and maintenance is difficult. The electromagnetic induction method allows accurate concentration measurements and is resistant to dirt, but the equipment is large and costly. Although the conductivity method cannot provide accurate measurements, it is inexpensive and can be miniaturized.

Therefore, as a technology prior to the present invention, a concentration measuring device using the conductivity method, which is capable of measuring salt concentration in a practical range by improving the electrode, has been manufactured and sold. For example, there is a Sinar salinity meter NS-3P sold by Aono Sangyo Co., Ltd., and the structure of its electrode portion is as shown in FIGS. 6 to 8. As shown in the figure, cylindrical electrodes 2 are embedded in the inner surface of a cylindrical body 1 made of an electrical insulator at regular intervals. The inner part of the cylindrical body 1 is closed, forming water holes 3 exposed on both sides. The inner diameter a of the cylinder 1 is 4 mm, and the inner diameter b of the water passage hole 3 is 2 mm.

When measuring the concentration of salt water 4, as shown in FIG.
Measurement is carried out by allowing salt water 4 to flow inside. If the salt water 4 to be measured is dirty, the electrode 2 will become dirty, so insert a cotton swab 5 into the cylinder 1 and remove the electrode 2.
Polish. However, since the back of the cylindrical body 1 is clogged, dirt is pushed to the back and accumulates, causing the water hole 3 to become clogged, making it necessary to clean the water hole 3.

(c) Problems to be solved by the invention The present invention provides an apparatus for measuring the concentration of liquid, especially salt water, in which electrodes can be easily cleaned.

(d) Means for solving the problems The structure of the present invention will be explained based on FIGS. 1 to 5.

The concentration measuring device includes a sensor section 14 having electrodes 11, 12, and 13, a calculation section 15 that processes input signals from the sensor section 14, and a display section that displays the result of the calculation section 15 as concentration (unit: %). 16. The calculation section 15 is formed by a microcomputer, and the display section 16 is formed from a light-emitting display element having a seven-segment figure-eight display tube arranged in the required number of digits. Arithmetic unit 15 and display unit 1
6 is incorporated into the operating body 17 of the device.

The sensor section 14 includes a holder 18 formed of electrical insulation, electrodes 11, 12, and 13 embedded in the holder 18 at regular intervals, and a holder 18 and electrodes 11, 13 extending from one opposing side of the holder 18 to the other side.
A linear water hole 19 penetrating through the water holes 12 and 13, a flap-like opening 20 on the holder 18 at both ends of the water hole 19, and signal lines 21 and 22 connected to the electrodes 11, 12 and 13, formed on the holder 18. An electrical insulating spacer 24 that fills the recess 23 for connecting the signal lines 21 and 22, and a holder 18 for the spacer 24.
The lid body 25 prevents the lid from coming off.
The signal line 21 is connected to the electrodes 11 and 13 by a fork wire.

Note that the electrodes 11, 12, and 13 have a cylindrical body with a water hole 19, and the inner surface thereof is the electrode surface directly related to concentration measurement. may be set.

(E) Effect In the present invention, the water flow hole 19 linearly passes through the holder 18 and each electrode 11, 12, 13, and both ends of the water flow hole 19 are exposed, so that the liquid flows smoothly inside the water flow hole 19. flows to In addition, by forming at least one end of the water hole 19 into a flange-shaped opening 20, the flow of liquid into the water flow hole 19 becomes smoother, and cleaning of the water flow hole 19 is also facilitated.
Removes dirt without leaving any residue inside. Further, the signal lines 21, 22 are connected to each electrode 11, 12, 1 by using the recess 23 for signal line connection formed in the holder 18.
3 and can be easily connected to the recess 23
The spacer is filled with a spacer and the spacer is covered with a lid to prevent the spacer from coming off and improve the sealing performance of the connection, thereby avoiding corrosion of the connection due to salt water.

(f) Example Based on the structure of the present invention mounted on a cold salt water treatment machine 30 shown in Figures 3 and 4, which soaks, preserves and washes fresh fish, meat and vegetables in cold salt water, the configuration of the present invention will be specifically explained, and the principle of measuring the concentration of salt water 31 will be explained.

The cold salt water treatment machine 30 has an insulated water tank 32 storing salt water 31 divided by a partition plate 33 to form a main water tank 34 and a sub water tank 35. pump 37
The water is blown out from the water supply port 38 of the main water tank 34. The water level in the main water tank 34 rises and overflows from the partition plate 33, filters out dirt and the like through the screen 39, and returns to the auxiliary water tank 35. A cooling pipe 41 of a refrigeration device 40 is arranged in the sub-water tank 35.

Fresh fish, meat, fruits and vegetables stored in baskets are placed in the main water tank 34 and processed. When processing fresh fish, the salinity is 3.5% to 4.0% and the temperature is -1.5℃.
At 0°C, the processing time is 5 to 20 minutes for green items and 5 minutes for colored items.
Processed for 30 minutes to 30 minutes, 30 to 90 minutes for thicker foods. For meat, the salt concentration ranges from 0.8% to 1.0%, and the temperature ranges from -1.5℃.
At 0℃, the processing time is 5 to 10 minutes for internal organs and chicken, and 10 to 15 minutes for beef and pork. For fruits and vegetables, the salt concentration is 0.2% to 0.3% and the temperature is 0℃ to 5℃.
Processing time is 1 to 3 minutes for pickled vegetables, 3 to 5 minutes for leafy vegetables, 5 to 10 minutes for Western vegetables, and 10 to 20 minutes for root vegetables.
Minutes are processed.

The salt concentration in the cold brine treatment machine 30 only needs to be able to measure the salt concentration in the range of 0% to 5% within the usage range and accurately measure the salt water temperature in the temperature range of -3°C to 7°C.

In the concentration measuring device of the present invention, which measures the salt concentration by measuring the conductivity of the salt water 31, the conductivity is determined by the salt concentration and the salt water temperature within the usage range of the cold brine treatment machine 30, and each is proportional to the other. In a relationship. This physical property is used to measure salt concentration.

The surface area where the electrodes 11, 12, 13 contact the salt water 31 is A, the distance between the electrodes 11, 13 and the electrode 12 is 1, the cross-sectional area of the water hole 19 between the electrodes 11, 13 and the electrode 12 is S, Electrodes 11, 12, 13
If the electrical resistance between the salt water 31 and the salt water 31 is Rα, and the resistance of the salt water 31 is R, then the total resistance R _T of the salt water 31 is expressed by the formula R _T =Rα×1/A+1×R×1/S+Ra×1/A. Given, the conductivity V required to obtain the salinity concentration N is obtained by 1/ _RT .

Therefore, salt water 31 is used to process fresh fish and meat.
Dirty with protein, oil, fat, electrodes 11, 12,
13 becomes dirty, Rα increases, R _T increases, and its error becomes 5% to 7% or more. In order to reduce the error, A should be made larger than in the above equation. If the electrodes 11, 12, and 13 are made thicker, A becomes larger, but the sensor part 14 also becomes larger, so the size of the sensor part 14 is set so that A×1/S is 150 or more. are doing. Specifically, the diameter of electrodes 11, 12, 13 is 12
mm, the diameter of the water hole 19 is 5 mm, and the electrode 11
The distance 1 of and 12 is 20 mm, and A is 5×π×
12, S is π×2.5 ² , set to 192,
Improves the reliability of _RT .

Since the salt concentration N changes depending on the salt water temperature T, a temperature detection sensor 42 is provided in the salt water 31. The electrodes 11 and 12, 12 and 13 are arranged in the same state, and the conductivity V is converted into an output voltage by a conductivity measurement section 43 and inputted to the calculation section 15 together with the output of the temperature detection sensor 42. . The calculation unit 15 calculates the salt concentration based on the following formula, and displays the salt concentration N (%) on the display unit 16.

^What _{is conductivity} ^N _and ^salt _{water temperature T ?} ^​ _{​ 10} ^{-5 c} ₁ = 0.055 a ₂ = _0.633 Specifically, c, a ₁ , a ₂ , b ₁ , b ₂ , c ₁ , and c ₂ are the above-mentioned numerical values, and these numerical values are determined by experiments and vary depending on the measurement conditions.

The sensor section 14 is attached to the inner surface of the sub-water tank 35, and a temperature detection sensor 42 is also attached nearby. The sensor part 14 is arranged so that the water flow hole 19 faces upward and downward, so that the water flow absorbed by the pump 37 flows vertically and smoothly passes through the water flow hole 19. The temperature detection sensor 42 may be attached to the holder 18 of the sensor section 14.

The operating body 17 is equipped with a circuit and a switch for controlling and operating the cold brine treatment machine 30. The display unit 16 is also used for display when each switch is operated. It has an operation switch that operates the pump 31 and refrigeration device 40 of the cold salt water treatment machine 30 and selects various operation modes, and the operation switch allows the operation to be started optimally according to the seasonal water temperature, and to be operated at a fixed time every day. You can select scheduled startup. Display section 16
The display can be changed by operating the display mode changeover switch, and displays the salt water temperature, salinity concentration, current time, and processing time. The detection level of salt concentration and the salt water temperature level are set by operating a switch that switches between sensor settings and display. In addition, there is an ice melting switch that melts the ice in the cooling pipe 41, an ozone mixing switch that blows ozone air into the cold salt water 31 to sterilize it, and a water tank 3.
It is equipped with switches required for various functions, such as a water supply switch that supplies water to the 2nd floor.

(g) Effects of the invention A direct current water hole penetrates the electrode buried in the holder and the holder, at least one end of the water hole is made into a lug-shaped opening, and a recess for connecting a signal line to each electrode is formed in the holder. However, since the spacer that fills this recess is covered with a lid, the liquid flows smoothly inside the circulation hole, preventing impurities from clogging the circulation hole, and cleaning the electrode using the direct circulation hole. can be easily done.

Furthermore, the spacer and lid can reliably seal the electrode signal line connection, and even if the concentration measuring device is immersed in salt water, corrosion of the formation line connection can be avoided and the connection can be maintained for a long period of time. Therefore, the concentration of liquid can be measured reliably.

[Brief explanation of the drawing]

Figures 1 to 5 show the present invention; Figure 1 is a side sectional view of the main part, Figure 2 is a front view of the same, Figure 3 is a sectional view of a cold salt water treatment machine using the present invention, and Figure 4 is a sectional view of the cold salt water treatment machine using the present invention. The figure is a sectional view of the main part, Fig. 5 is a circuit diagram of only the main part, Figs. 6 to 8 show the conventional technology, Fig. 6 is a perspective view of the main part during cleaning, and Fig. 7 is a circuit diagram of only the main part. FIG. 8 is a cross-sectional view of the main part and a perspective view of the concentration measurement state. 11, 12, 13... Electrode, 14... Sensor part, 18... Holder, 19... Water hole, 20...
Laptop-shaped opening, 23... recess, 24... spacer, 25... lid body.

Claims (1)

[Scope of utility model registration request] A holder formed of an electrical insulator, at least one pair of electrodes embedded in the holder, and one opposing side of the holder in a device that measures the concentration of the liquid by disposing at least one pair of electrodes in the liquid. A straight water hole passing through the holder and the electrode facing from one side to the other side, a lug-shaped mouth formed at at least one end of the water hole, a signal line connected to the electrode, and a recess formed in the holder for signal line connection work. A liquid concentration measuring device comprising: an electrically insulating spacer that fills the recess; and a lid that covers the spacer.