Does a tracking device make noises
Leak detection: a job for a sniff
Locate leaks on flat roofs
A number of methods are suitable for finding holes and cracks in the roof cladding of flat roofs. These methods can also be used to examine parking decks, terraces and seals on components in contact with the ground.
Leopoma (resistance) procedure: The Leopoma (resistance) method measures how the electrical resistance between two flat roof electrodes on the seal changes due to the leak. There is an indicator lamp on each of the electrodes, whereby the lamp that is closer to the leak point starts to light up. A closed water circuit must be available for localization.
Pulse current method (Geesen potential difference measurement): With the pulsed current method, the potential gradient between the leakage point and the installed ring line is measured with the aid of a receiver and two measuring electrodes. The roof surface must be damp so that the potential gradient can develop.
Flue gas or mist process: Furthermore, the flue gas process can be used in the event of leaks on flat roofs. Smoke is brought under the roof membrane with a slight excess pressure. The smoke emerges visibly from leaks. During the investigation, there should be as little wind as possible and it should not rain.
By generating a negative pressure in a building (a residential unit), leaks at connections (e.g. window frames on the masonry or the frame of the balcony door on the masonry) can be investigated with the help of a fog device. If overpressure is generated, this can also be done from the inside to the outside with a larger fogger. If it is assumed that there are major leaks, the fire brigade must be notified of the work. Otherwise, attentive neighbors may report an apartment fire.
Using special methods to locate leaks at component connections
In the "EFT tracer process" (Electrical Flux Tracking), a grid or point measurement is made using sensors that receive energy from the outside via a Cu electrode in the form of a defined electrical signal. Connection. As with the pulsed current method, the water entry point is determined via a receiver. With the "TCC leak location method" (Technical Crossed Components), a contact measurement is carried out at selected points. Here the property is exploited that electric current follows the path of the water. Measurable moisture is sufficient.
Locate leaks in pressureless water pipes
Pipelines and sewers are visually checked with the sewer TV. If no damage can be seen, barrier bubbles or cushions can be placed. The line is then filled up to the barrier bladder and checked for losses. Today there is also canal TV with transmitters that are incorporated into the head of the camera. This allows lines to be pre-located with a line location device. The locating device receives an electrical signal from the camera head and thus follows the camera movement. However, this is only possible for cables with a diameter of 22 millimeters or more, as the smallest head currently has a circumference of 15 millimeters. Endoscopy for cavity inspection works in a similar way to checking cavities and pipes with sewer TV.
Locate air currents and air leaks in the building envelope
Leak detection is not always about finding out where water enters the building. Air leaks in or out of the building can also cause moisture damage. In order to find this, the necessary negative or positive pressure in the building (50 Pa) must be generated with a device that can generate one. Various methods can then be used to measure the points at which air flows into the building.
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