JPH0346550A - Cablelike acid liquid detecting sensor - Google Patents

Abstract

PURPOSE:To surely detect the arrival of an acid liquid by using a wire body consisting of an insulating material as a core, forming a metallic thin film dissolved in an acid in the longitudinal direction of the outside surface of the wire body, and providing insulation coating having a liquid passing property on the outside of the thin film. CONSTITUTION:On the outside surface of a round wire 1 formed by plastic, galvanization 2 is performed continuously in the longitudinal direction. Also, a solid wire 3 in which a conductor 3A is placed in the center and insulator coating 3B is performed to the periphery is placed in parallel to the round wire 1, and a twisted wire is constituted of the round wire 1 and the solid wire 3. Also, the periphery of the twisted wire is covered with a blade 4 made of plastic having a liquid passing property. In the case of using such a sensor, the conductor 3A and the galvanized 2 part are connected in a short state in one terminal part, and the other terminal part is connected to a detector. In this state, when an acid liquid reaches the sensor, the acid liquid passes through the blade 4 and intrudes into the inside of the sensor, dissolves the galvanization 2, and a conducting state by the galvanization 2 is cut off. Therefore, by observing this variation by the detector, the arrival of an acid liquid can be detected.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a cable-shaped acidic liquid detection sensor.

[Prior Art] Conventionally, elements described in Japanese Patent Publication No. 57-5002 and Japanese Utility Model Application Publication No. 58-96248 are known as elements for detecting leakage of acidic liquid. The methods described in these publications maintain two conductors arranged parallel to each other in an insulated state with an insulator, and measure the resistance value and impopedance between the conductors caused by the intrusion of the liquid to be detected. By measuring changes in physical characteristics, it was possible to detect the presence or absence of liquid leakage and the arrival of liquid.

[Problem to be solved by the invention] By the way, although the conventional method can be used to detect many types of liquids, not just acidic liquids, on the other hand, it also detects rainwater etc., so the detection data is Without rigorous analysis, it may be difficult to determine whether the liquid you are trying to detect has actually arrived.
It was not possible to determine whether rainwater, etc. had simply arrived. Therefore,
It has been difficult to accurately monitor only acidic liquids with simple equipment.

[Means for Solving the Problems] In order to solve the above problems, the cable-shaped acidic liquid detection sensor of the present invention uses a filament made of an insulating material as a core material, and the outer surface of the filament is It is characterized in that an acid-soluble metal thin film is formed continuously in the longitudinal direction, and an insulating coating having liquid permeability is provided on the outside of the filament on which the thin film is formed.

Further, the sensor of claim 2 uses a filament made of an insulating material as a core material, and metal foil soluble in acid is continuously arranged in parallel along the filament, and the filament is made of an insulating material. It is characterized in that both the body and the metal foil are covered with a liquid-permeable insulating coating.

[Function] In the above sensor, as long as the metal thin film or metal foil is continuous in the elongated direction, there is a conductive relationship between both ends thereof. However, when the acidic liquid enters, the thin film or foil melts and is no longer electrically conductive. Therefore, by monitoring this change, the arrival of the acidic liquid can be detected. Furthermore, in this sensor, a liquid-permeable insulating coating is placed on the outside of the metal thin film or metal foil, so that the metal thin film or foil is protected and can be used in harsh environments such as outdoors. Moreover, by arranging the filament made of an insulating material as a core material, the strength in the longitudinal direction is also increased.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention, in which symbol (2) indicates a round wire (striated body) made of plastic (insulating material). The outer surface of this round wire 1 is coated with zinc plating (zinc thin film) 2 continuously in the longitudinal direction. Further, in parallel to the round wire 1, a single wire 3 having a conducting wire 3A in the center and an insulator coating 3B around it is arranged, and the round wire 1 and the solid wire 3 constitute a twisted wire. There is. A plastic braid (insulating coating) 4 having liquid permeability is placed around the twisted round wire 1 and solid wire 3.

When using a cable-like sensor configured in this way, the conductor 3A in the single wire 3 and the round wire 1 are connected at one end.
The two galvanized parts are connected in a short-circuit state or connected via a terminating resistor, and the other end is connected to the detector. Then, the conduction state of the circuit within the sensor is monitored.

In this state, when the acidic liquid reaches the sensor, it enters the sensor through the outer blade 4 and comes into contact with the galvanized plate 2. Then, the galvanizing layer 2 is melted and the electrical conductivity caused by the galvanizing layer 2 is cut off. Therefore, by observing this change with a detector, the arrival of the acidic liquid can be detected. Note that even if rainwater or the like arrives, the galvanized plating 2 will not dissolve. Therefore, there is no change in the conduction state, and a detection output is generated only in the case of acidic liquid. Further, in the case of this sensor, since the arrival of the acidic liquid is detected by a disconnection, the detection principle is simple and can be easily realized, and reliable detection is possible.

FIG. 2 shows a second embodiment. In the sensor of this embodiment, a tape 7 in which aluminum foil 5 and polyethylene 6 are laminated is placed vertically on the outer surface of an insulating coating 3B of a single wire 3 having a conducting wire 3A in the center, with the aluminum foil 5 positioned on the outer surface. It is attached in a spliced or spiral manner, and the outside thereof is covered with a plastic blade 4.

In the sensor of this embodiment, as in the above embodiment, the conducting wire 3A and the aluminum foil 5 are connected in series at one end, and the other end is connected to the detector. Then, when the acidic liquid arrives, the aluminum foil 5 melts and the arrival of the acidic liquid is detected in the same manner as above.

FIG. 3 shows a third embodiment. In this embodiment, an aluminum foil (copper foil or a zinc tube may also be used) 8 is arranged vertically along the outer surface of a plastic round wire 1, and a liquid-permeable plastic braid 9 is placed over it. form a single line. Then, this wire and the single wire 3 are arranged in parallel, and a plastic braid 4 is further placed over the wire to form a cable-like sensor. In addition,
The aluminum foil 8 may be wrapped spirally around the outer periphery of the round wire 1 or attached vertically;
Alternatively, it may be continuous along the single line 3. This sensor also provides the same effects as described above.

In addition, in these embodiments, another single wire 3 is arranged parallel to the metal thin film or metal foil, but it does not necessarily need to be arranged. In that case, both ends of the metal thin film or metal foil may be connected to a detector to monitor the conduction state.

[Effects of the Invention] As explained above, according to the acidic liquid detection sensor of the present invention, it is possible to reliably determine whether or not an acidic liquid has arrived by an extremely simple method of monitoring the conduction state of a metal thin film or metal foil. can be detected.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention, FIG. 2 is a sectional view of a second embodiment, and FIG. 3 is a sectional view of a third embodiment. 1...Round wire (striated body made of insulating material), 2...
・Zinc thin film, 4...Plastic blade (
insulation coating), 5.8...aluminum foil.

Claims (2)

[Claims] (1) Using a filament made of insulating material as a core material,
A thin metal film that dissolves in acid is formed continuously in the longitudinal direction on the outer surface of the filament, and an insulating coating having liquid permeability is provided on the outside of the filament on which the thin film is formed. A cable-shaped acidic liquid detection sensor featuring: (2) Using a filament made of insulating material as a core material,
A cable-like structure characterized in that acid-soluble metal foils are continuously arranged in parallel along the filament, and both the filament and the metal foil are covered with an insulating coating having liquid permeability. Acidic liquid detection sensor.