JPH02247534A - Method and apparatus for monitoring leakage in canalization - Google Patents

Abstract

PURPOSE: To attain detecting even small leakage with high reliability by introducing test fluid of specific test capacity into a conduit system at pressurized state and measuring the time necessary for the test capacity to flow in the conduit system. CONSTITUTION: If small leak is caused, fluid gradually leaks from a conduit system 8 to the outside and the pressure P2 in the conduit system is gradually decreased. Receiving the pressure P1 of the source operating to a pressure chamber 11, a wall 4 starts to move rightward and as the results, the test capacity of the fluid existing in the chamber 12 is supplied in the conduit system 8. After the time measured with a time measuring element 16 becomes a certain value, the wall 4 reaches its right end position, which is detected by a sensor 14. Then a controller 6 outputs an operation signal to an operation device 5 to open a main valve 1 again. Therefore, the wall 4 displaces again to its left end position and a test cycle is newly started. As the control device 6 is provided with an integrator 15 adding the cycle number of the wall 4 and the test capacity is known, the integral leakage amount of fluid can be known.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application) The present invention provides a method for introducing test fluid into a conduit system during a test period when the fluid is not removed from the conduit system and the conduit system is closed by the main valve on the supply side. The present invention relates to a leakage monitoring method for a conduit system for incompressible fluid introduced with a conduit system for incompressible fluid, the conduit system for incompressible fluid comprising a main valve on the supply side of the conduit system and a control device for controlling the operation of the main valve. The present invention relates to a system leak monitoring device.

BACKGROUND OF THE INVENTION Conduit systems for fluids need to be monitored for loose fittings and leaks. This applies essentially to all conduit systems, whether they conduct mains supply water into the house, heated liquids to heating and remote heating systems, or gas or fuel to distribution circuits. It doesn't matter what purpose it is used for, such as guiding.

Monitoring of mains water supply within buildings has become particularly important in recent years. This problem will be explained below using a main water supply system in a residential building as an example.

Typically, the water consumption that a consumer draws from one tap is between approximately 50 and 1,500 l/h.

In extreme cases, for example toilet cisterns or washing machines, the consumption may be between 30 and 2,500 Il/h. Leaks due to broken pipes or ruptured washing machine or dishwasher supply hoses (i.e. large leaks) are generally
It ranges from 0 to 2,500 Il/h, sometimes higher, and is therefore indistinguishable from normal consumption. Therefore, in the case of such large volumes exceeding the specified value, the water supply will be cut off after the specified water withdrawal time, regardless of whether the consumer is actually using the water or whether there is a large leakage. is temporarily interrupted.

On the other hand, water leaks, hereinafter referred to as "small leaks", also occur. In this case, the water leakage ranges from about 1 to 251/h, and on the one hand, it results from dripping from the tap or from the toilet cistern, and on the other hand, the water collapse occurs due to loose pipe connections and corrosion. This occurs when fatigue failures, capillary cracks in pipes and vessels, or similar failures begin in the conduit system. While the first set of examples above is not dangerous and only increases water and wastewater costs and demands on drinking water supplies and the environment, the second set of small leaks can cause major damage. be. That is, although a runoff rate of 1 to 251/h may seem very small, over a long period of time, the walls and other parts of the building become irreparable as a result of moisture saturation. Damage that occurs in this way is often noticed too late, as the moisture starts inside the wall and is not visible until the entire wall is saturated. If found, it can be repaired as appropriate.

To check for leaks in a central heating system, WO 87104520 discloses a device consisting of two impeller-type flow meters installed in the supply and return conduits of the system.

Determine the ml flowing through the heating system with both impellers. If there is no leakage, the two quantities should be the same. If a difference exists between the two quantities, a leak is assumed and the circuit is shut off by the motorized valve. However, since volumetric flowmeters for mainstream use, that is, for large capacity, are provided, these flowmeters cannot detect small leaks of, for example, 251/h or less with the necessary accuracy.

WO 86106457 discloses a device for monitoring leak points in pressure conduits, which measures the pressure in the conduit system downstream of the main valve, and which measures the pressure in the conduit system downstream of the main valve and prevents large volumes of fluid from passing through the main valve for an extended period of time. If the main valve is closed,
The main valve is closed if the time required for the pressure to drop from the first pressure to the second pressure is less than the allowed time interval. However, the pressure on the supply side of the main valve may, for example, be around 0.6 as a result of pressure fluctuations in the water supply equipment, which can be on the order of 2 bar, or as a result of rapid consumption in the adjacent pipeline system.
When the bar drops and its consumption ends, it rises by about 0.4 bar above the normal supply water pressure, and also varies considerably due to the pressure drop at the main valve as a result of consumption in the monitored pipeline system itself. Therefore, International Publication No. 87106457
The pressure measurements disclosed in this issue give unsatisfactory results.

A known device (DE 2158901) for monitoring installation looseness in equipment extracts compressible fluid from an inlet source upstream of the main valve, e.g. from a supply main, when no fluid is being withdrawn. , which is compressed by a compressor and then fed into the conduit system downstream of the main valve, thereby detecting leaks. When the test pressure is reached, the compressor is shut down. Here, it is checked whether the pressure loss does not exceed a predetermined value within a predetermined time. Another embodiment checks whether the compressor is able to build up the required test pressure during a predetermined operating time.

Since the capacity delivered by a compressor always depends on the pressure difference between the inlet and the outlet of the compressor, it is practically impossible to draw conclusions regarding the delivered capacity unless both pressures are also monitored. This known device is therefore only suitable for determining whether a leak exists. We don't know how big the leak is. Furthermore, a separate drive is required for the compressor, which creates undesirable noise. Also, after detection of a leak, the main valve is locked in the closed position, but fluid is still allowed to flow into the conduit system through the $ compressor and continues to leak.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a method and a device that can detect even small leaks with high reliability.

(Structure and operation of the invention) Such an object of the present invention is that test fluid is introduced into the conduit system during a test period when no fluid is removed from the conduit system and the conduit system is closed by the main valve on the supply side. In a leak monitoring method for a conduit system for incompressible fluid, a predetermined test volume of test fluid is introduced into the conduit system under pressure without introducing test fluid from the supply side of the main valve, and the test volume is It is solved by measuring the time required for entry into the system.

During testing, exactly the same amount of fluid flows out through the leak point as during normal operation. Since this leakage amount of fluid is immediately replenished, the leakage flow rate can be accurately measured if the leakage flow rate does not change much within a predetermined period of time. This is easily detected by dividing the known test volume, ie the amount replenished, by the measurement time. Furthermore, a constant pressure is maintained during the replenishment of the test fluid into the conduit system to be monitored, so that sufficient bottle fluid is immediately available at the beginning of consumption.

In one embodiment of the method of the invention, the pressure at which the test fluid is introduced into the conduit system is as great as the fluid pressure on the supply side of the main valve. Known devices require an increase in pressure which increases leakage caused by material fragility. Therefore, in the present method, a test fluid is introduced into the conduit system under normal pressure without applying excessive pressure to detect leaks. When the main valve is opened, the normal pressure, i.e. the supply pressure of the mains, for example the water main of a municipal facility, is applied to the leak point, so that by replenishing the test volume under the same pressure, leakage of leakage fluid can be substantially regenerated. Because excessive pressure is avoided, the conduit system to be monitored is not subjected to greater stress than during normal operation.

Preferably, test fluid is drawn from the conduit system prior to the test period. Thus, for test purposes, exactly the same fluid is used as is normally delivered by the conduit system to be monitored. No special test fluid needs to be provided, which makes the test method significantly cheaper. Therefore,
Since all the test fluids used have already passed through the main valve and the connected measuring instruments, there will be no difficulty, for example, when comparing the consumption profile of mains supply water with water facilities. Also, there is no need to provide special filters or similar equipment for the test fluid. Since the uptake of the test fluid takes place immediately before the test period, there is virtually no possibility of a dropout due to a time difference between the uptake of the test fluid and the test period.

Advantageously, the test volume is less than 0.5 f.

The maximum test volume of 500 ccm is relatively small, enough to fill a cylinder 3 cm in diameter and approximately 10 cm in height. This reduces construction costs and significantly reduces the space occupied by the test equipment. The smaller the test volume, the higher the time resolution.

Preferably, after completion of the introduction of the test fluid, another test fluid having a test volume is taken from the conduit system and maintained ready for new introduction into the conduit system. This allows continuous measurement of leakage volume. Therefore, the time required for leakage to flow out can be monitored more efficiently.

Preferably, the total volume of test fluid introduced is determined by adding the individually introduced volumes. This not only gives an indication of the individual volume of leakage, but also the total amount of fluid released as an additional criterion for evaluation.

It is also advantageous for the leakage flow rate to be determined continuously. This allows rapid recognition of changes in the leakage behavior of the conduit system to be monitored, so that appropriate protection or countermeasures can be taken accordingly.

Preferably, an alarm signal is emitted when said total capacity exceeds a first predetermined value and/or when the leakage flow rate is between a first and a second leakage flow value.

An alarm may be an optical or acoustic signal.

To generate an alarm, two criteria are used: the total volume leaked from the leak point on the one hand, and the actual leakage flow rate on the other hand. If the actual leakage rate is below a certain limit, for example 11/h, the system is considered leak-free. If the leakage flow rate is, for example, between IJ/h and 31/h, it is considered a small leak that does not cause serious damage, although it must be monitored. Also, if the leakage flow rate is, for example, between 31/h and 20 f/h, it is considered a large leak that can cause serious damage. Small leaks may, for example, be immediately indicated. However, a small leak may only be indicated when the amount emitted by the leak exceeds a first predetermined value.

Preferably, when the total capacity exceeds a second predetermined value,
The introduction of fluid into the conduit system is completely interrupted. Regardless of the size of the leak, a leakage of water greater than a predetermined value can pose a serious danger to the building, and it is therefore a good idea to close the main valve completely to avoid further damage. Of course, the main valve can also be shut off depending on the actual flow rate of the leak.

In a preferred embodiment, said total volume is returned to zero when the leakage flow rate decreases by a predetermined amount. For example, a leak may be caused by a drip from a water faucet that the user did not completely turn off. If the user realizes that the water supply has been improperly tightened and closes the faucet, the leak will stop. In this case, it is a good idea to correct the total volume that was assumed to have leaked into the wall from the defective part of the pipe system. This allows you to work with more realistic parameters during the next test period.

Furthermore, the object of the present invention is to provide a main valve on the supply side of the conduit system;
In the leak monitoring device for a conduit system for an incompressible fluid, the conduit system includes a chamber for introducing a predetermined test volume of test fluid, the volume of which is a first communicating with a chamber that is variable between a larger predetermined value and a second smaller predetermined value, the liquid chamber communicating only with the conduit system, and the liquid chamber having a volume varying from the first volume to the second volume; This problem can be solved by providing a time measuring means for measuring the time until the value decreases.

That is, the chamber serves as a storage location for the test fluid drawn from the conduit system. Since a chamber can have two extreme states, a state of large capacity and a state of small capacity,
The amount that flows out of the chamber into the conduit system or out of the conduit system into the chamber during the time between these two conditions will be the exact difference in volume. The chamber communicates only with the duct system;
Since there is no communication with the supply side of the main valve, everything that flows out of or into the chamber must flow through the conduit system. Since the outflow from the chamber for test purposes only takes place with the main valve closed and without a pressure increase in the conduit system, the chamber is accurately identified as having leaked from the conduit system through the leak point. The same amount of fluid is introduced into the conduit system. The time measuring means measures the time required for the test fluid to flow into the conduit system. That is, the time measuring means measures the time required for a given volume to flow out of the conduit system through the leak point. This allows an indication as to the actual leakage flow rate, assuming that the leakage fluid flow does not undergo significant temporal changes.

Preferably, said chamber is closed on one side by a movable wall. The chamber is sealed on all sides except for the communication hole to the conduit system, and the internal volume is variable by the walls. Therefore, the capacitance changes linearly with the displacement of the wall, making it easy to evaluate.

Preferably, the wall is movable against the force of the spring towards the lower capacitance value. Since the same pressure is applied to both sides of the wall, the spring moves down the wall so that the chamber is at its maximum capacity. The spring thus facilitates resetting.

Preferably, the movable wall is subjected to a constant force along the entire travel path on the side opposite the chamber. Therefore, ignoring the reaction force of the spring, which is compressed more strongly as the displacement increases, the same pressure will always act on the wall and thus on the chamber, regardless of the distance displaced. Note that since the spring is relatively weak compared to the force acting on the side of the wall opposite to the chamber, changes in the reaction force of the spring can be ignored.

In a particularly advantageous embodiment, the side of the wall opposite the chamber communicates with the pressure on the supply side of the main valve. This means that the supply pressure of the inlet source, e.g. It acts on the chamber without allowing it to flow into the chamber. Furthermore, no auxiliary energy is required. Instead, supply pressure is utilized. Since the pressure within the monitored conduit system cannot be higher than the supply pressure from the inlet source, excessive stress on the monitored conduit system is avoided during monitoring.

In a preferred embodiment, a sensor is provided which sends a signal to the controller when the volume of the chamber reaches a smaller value. This end position is required, for example, for time measurement.

Preferably, the control device opens the main valve in response to the signal. When the volume of the chamber reaches its smaller value, a pressure drop should occur within the conduit system. This pressure drop is
This can occur either through consumption or leakage. In case of consumption, the main valve must be opened so that the user can remove fluid from the conduit system. On the other hand, in case of leakage, monitoring must be carried out.

When monitoring large leaks, the timing element preferably generates a command to close the main valve a predetermined amount of time after opening of the main valve. Since the leak monitoring system cannot distinguish between consumption and large leaks, the above procedure allows only a certain maximum amount of fluid to exit the conduit system. Consumers who want to extract more fluid can
An indication to that effect can be given to the control device in advance, or consumption can be temporarily interrupted to inform the control device that there is no major leak.

In another preferred embodiment, the control device includes an integrator that integrates the volume of test fluid pumped from the chamber into the conduit system. This makes it possible to always have a value indicating the amount of leakage that has leaked up to the current point in time.

It is also advantageous for the control device to lock the main valve in the closed position when the integrator detects a total volume greater than a predetermined value and/or when the flow rate of the test fluid exceeds a predetermined value. . Even if the flow rate of the leak exceeds a predetermined value, there is no risk of major damage if the leak is small as described above. Another criterion that can be combined with this first criterion is whether a certain amount of leakage fluid has leaked in total. This amount can be adapted to suit individual conditions. However, when a predetermined leakage flow rate is exceeded, the main valve should be closed to avoid major damage.

Embodiments Examples of the present invention will now be described with reference to the drawings, which are schematic diagrams of leak monitoring devices for conduit systems for incompressible fluids.

For example, a conduit system 8 for mains water supply in a residential building.
Water is supplied through the main valve 1 from an introduction source 7 which is, for example, main supply water from a water supply facility. The main valve 1 is remotely controlled by an actuating device 5 operated by a control device 6 . When the main valve 1 is closed, no water reaches the conduit system 8 from the inlet source 7. A leak monitoring device is provided in parallel with the main valve 1. The device comprises a cylinder 2 divided by a movable wall 4 into a pressure chamber 11 and a chamber 12 .

The pressure chamber 11 communicates with the water supply side of the main valve 1. Room 1
2 communicates with the water discharge side of the main valve 1, ie with the conduit system 8. Wall 4 seals chamber 12 from pressure chamber 11 .

Since the wall 4 is movable within the cylinder 2, the volume of the chamber 12 has a large value when the wall 4 abuts the left end of the cylinder 2, and a small value when the wall 4 abuts the right end of the cylinder 2. variable between The wall 4 is connected to the cylinder 2 by the force of the spring 10.
is being pushed towards the left edge of the

Here, it is assumed that water is not being taken out from the conduit system 8 via the faucet 9 and the main valve 1 is open. Therefore,
No water flows through the main valve l and there is no pressure drop. The pressure P1, which is equal to the pressure of the inlet source 7 on the supply side of the main valve, is therefore equal to the pressure P2 on the discharge side of the main valve, ie the pressure in the conduit system 8. Also, pressure P1 is pressure chamber 1
1, while pressure P2 is applied to chamber 12. Therefore,
In this state, equal pressure is acting on both sides of the wall 4. However, since the force of the spring lO is further acting on the surface of the wall 4 on the chamber 12 side, the wall 4 is displaced toward the left end of the cylinder 2. A sensor 14 is provided at the right end of the cylinder 2, which detects when the wall 4 is in its right end position, i.e. when the chamber 12 has the smallest volume.
It is activated by an actuator 13 in the wall 4. wall 4
When is pushed to the left by the force of the spring lO, this is detected by the sensor and a detection signal is output to the control device 6. A timing element 16 is now activated within the control device 6 and outputs a signal to the actuating device 5 to close the main valve after a predetermined period of time.

If no fluid is removed from the conduit system 8, the pressure remains constant there and the wall 4 is therefore held in its leftmost position.

However, if a small leak occurs, the fluid will trickle out of the conduit system 8 to the outside, gradually reducing the pressure P2 within the conduit system. The wall 4 receives the pressure P of the introduction source acting on the pressure chamber 11.
1, it begins to move to the right, thereby replenishing the conduit system with the test volume of fluid present in chamber 12. After the time measured by the timing element 16 reaches a certain value, the wall 4 reaches its rightmost position, at which point the beam -
It is detected by a sensor 14 which may be formed by a relay. Since the test volume is known, from this test volume and the time required for the test volume to flow into the conduit system 8,
The flow rate leaked from the conduit system 8 through the leak point, ie the volume per unit time, can be calculated. Since the test volume flows into the conduit system 8 without an increase in pressure,
When the main valve l is opened, no pressure load higher than the supply pressure occurs in the line system 8, and the pressure from the inlet source 7 can act directly into the line system 8.

When the sensor 14 detects that the wall 4 is in its rightmost position, the control device 6 outputs an actuation signal to the actuation device 5, causing the main valve l to open again. The wall 4 is therefore again displaced to its leftmost position as described above and the test cycle is started anew.

The control device 6 comprises an integrator 15 which adds up the number of cycles of the wall 4 and, since the test volume is known, it is possible to know which total amount of fluid has leaked out due to the leak.

The test volume can be reintroduced into the conduit system at any time.
It is possible to obtain a continuous indication of the actual leakage flow rate. Also, since the amount of leakage that has already occurred is known, these two leakage loss criteria can be used to reliably activate the indicator and/or close the main valve l.

For example, if the leakage flow rate is a first predetermined value, e.g.
When h is exceeded, the indicator is activated.

When the leakage amount exceeds a first predetermined value, for example 601,
That is, if the amount of leakage exceeds a first predetermined value, a similar indication is given and the integrator 15 is returned to zero again.

Of course, the number of times the integrator is reset to zero can be limited to prevent too much leakage fluid from leaking out. For example, the main valve 1 may be locked to the closed state without resetting the integrator 15 to zero at the third time.

If the leakage flow rate is greater than a second predetermined value, for example 3 Il/h, the integrator is not reset to zero and only the indicator is activated when the first predetermined leakage value is reached. The integration, ie the addition of the individual test volumes, then continues.

When the integrator 5 indicates that the amount of leakage fluid that has leaked out is greater than a second predetermined test amount, e.g. Also, when the leakage flow rate exceeds a second predetermined value, the main valve may be locked in the same way.However, the criterion for closing the main valve is the previous leakage amount, that is, the Preferably, it also depends on the amount of fluid that has leaked out.

As for the individual values of the leakage flow rate, for example, as described above, the first value is l i/h and the second value is 31! /h. 11
Below a value of /h, the conduit system can be considered leak-free. 31
/h or more is considered a large leak that only allows a certain amount of fluid to pass before the main valve 1 is closed.

If the consumer wants to withdraw water at point 9, for example, he turns on the tap 9, whereby the pressure P2 drops rapidly in the conduit system. The wall 4 is quickly pushed towards the right wall of the cylinder 1 under the influence of the pressure P, and the main valve 1 opens accordingly.

Water can then flow from the introduction source 7 into the conduit system 8 . The same thing occurs if there is a large leak, for example if a pipe breaks or a washing machine or dishwasher supply hose ruptures. In order to prevent too much water from escaping in such a case, the timing element 16 closes the main valve l again after a predetermined time has elapsed after the pressure drop. This predetermined time period may be sufficient to fill a bathtub or take a normal shower, such as 15 minutes, for example. Of course, there may be times when a consumer wants to extract water for a longer period of time, such as washing a car or watering a garden. In this case, the consumer inputs a signal to that effect into the control device 6, for example by actuating a switch, and the control device sets the maximum water withdrawal time for the next consumption to, for example, 2 hours. You can do it like this. However, no matter what work is performed by the consumer thereafter, the initial time is, for example, 15 minutes.

Another possibility for the operation of the timing element 16 is to send an acoustic or optical signal just before the expiration of a predetermined time, in response to which the consumer temporarily closes the tap 9. Then, the pressure P2 increases and moves the wall 4 to the left again. As soon as the control device 6 detects that the wall has left its rightmost position, ie that the volume of the chamber 12 has started to rise again, the maximum water intake time can be started again.

Such a pressure increase is unlikely to occur in the case of large leaks. Therefore, the damage caused by a large leak is
It can also definitely be kept relatively small.

[Brief explanation of drawings]

The drawing is a schematic diagram of a leak monitoring device for a conduit system for incompressible fluids. ■... Main valve, 2... Cylinder, 4... Movable wall, 5... Actuating device, 6... Control device, 7
...Introduction source, 8... Conduit system, 10... Spring,
DESCRIPTION OF SYMBOLS 11... Pressure chamber, 12... Chamber, 14... Sensor, 15... Integrator, 16... Timing element.

Claims (20)

[Claims] (1) In a method for leak monitoring of a conduit system for incompressible fluids, in which a test fluid is introduced into the conduit system during a test period when the fluid is not removed from the conduit system and the conduit system is closed by the main valve on the supply side. , a predetermined test volume of test fluid is introduced into the conduit system under pressure without any test fluid entering from the supply side of the main valve, and the time required for the test volume to flow into the conduit system. A method for monitoring leakage in a conduit system, characterized in that: (2) the pressure at which the test fluid is introduced into the conduit system;
The method of claim 1, wherein the fluid pressure is of the same order as the fluid pressure on the supply side of the main valve. 3. A method for monitoring leaks in a conduit system according to claim 1 or 2, characterized in that, before the test period, test fluid is drawn from the conduit system. (4) The method for monitoring leakage in a conduit system according to any one of claims (1) to (3), wherein the test volume is smaller than 0.5 liters. (5) After completion of the introduction of the test fluid, another test fluid having a test volume is again drawn from the conduit system for monitoring purposes and kept available for introduction into the conduit system. The method for monitoring leakage in a conduit system according to any one of claims (1) to (4). (6) The method for monitoring leakage in a conduit system according to claim (5), wherein the total volume of the introduced test fluid is determined by adding up the individually introduced volumes. (7) The method for monitoring leakage in a conduit system according to claim (5) or (6), wherein the leakage flow rate is continuously determined. (8) When the total capacity exceeds a first predetermined value, and/
Alternatively, the method for monitoring leakage in a conduit system according to claim 6 or 7, wherein an alarm signal is issued when the leakage flow rate is between a first predetermined value and a second predetermined value. . (9) Any one of claims (6) to (8), characterized in that when the total volume exceeds a second predetermined value, the introduction of fluid into the conduit system is completely interrupted. Methods for monitoring leaks in conduit systems as described in . (10) Claim (10) characterized in that when the leakage flow rate decreases by a predetermined amount, the total capacity is reset to zero.
7) The method for monitoring leakage in a conduit system according to any one of (9). (11) In order to carry out the method for monitoring leakage in a conduit system according to any one of claims (1) to (10),
In a leak monitoring device for a conduit system for incompressible fluid, which includes a main valve on the supply side of the conduit system and a control device for controlling the operation of the main valve, a first A chamber (12) whose capacity is variable between a large predetermined value and a second small predetermined value communicates with the conduit system (8), and the chamber (12) communicates only with the conduit system (8). A leak monitoring device for a conduit system, characterized in that the chamber is provided with time measuring means (16) for measuring the time during which the chamber decreases from a first volume to a second volume. (12) A leak monitoring device for a conduit system according to claim 11, characterized in that one side of the chamber (12) is closed by a movable wall (4). (13) A leakage monitoring device for a conduit system according to claim (12), characterized in that the chamber (4) is movable towards a smaller capacitance value against the force of a spring (10). . (14) Claim (12) or (13) characterized in that the movable wall (4) is subjected to a constant force along the entire path of movement of the wall (4) on the side opposite to the chamber (12). A leak monitoring device for a conduit system as described in . (15) The side surface of the wall (4) opposite to the chamber (12) is
15. The conduit system leak monitoring device according to claim 14, characterized in that it communicates with the pressure on the supply side of the main valve (1). (16) A sensor (14) is provided which sends a signal to the control device (6) when the capacity of the chamber (12) reaches a second smaller value. 1
5) The leakage monitoring device for a conduit system according to any one of 5). (17) In response to the signal, the control device (6) controls the main valve (
17. A leak monitoring device for a conduit system according to claim 16, characterized in that: 1) is opened. (18) When a predetermined time has elapsed after opening the main valve (1),
Leak monitoring device for a conduit system according to any one of claims (11) to (17), characterized in that the time measuring means (16) generate a command to close the main valve (1). (19) Claim (11) characterized in that the control device (6) comprises an integrator (15) for integrating the volume of the test fluid sent from the chamber (12) into the conduit system (8). )
The conduit system leak monitoring device according to any one of (18) to (18). (20) When the integrator (15) detects a total volume larger than a predetermined value and/or when the flow rate of the test fluid exceeds a predetermined value, the control device (6) activates the main valve (1). 20. A conduit system leak monitoring device according to claim 19, characterized in that it is locked in the closed position.