A water leak detector is an electronic device that is designed to detect the presence of water for purposes such as to provide an alert in time to allow the prevention of water leakage. A common design is a small cable or device that lies flat on a floor and relies on the electrical conductivity of water to decrease the resistance across two contacts. The device then sounds an audible alarm together with providing onward signalling in the presence of enough water to bridge the contacts.
Water leak monitoring in buildings with sensitive electric and electronic equipment or valuables is today an elementary part of building supervision and guarding. The water leakage detection systems are used for the surveillance of rooms, piping and individual items. Each leakage is detected with metre accuracy and reported directly in the building surveillance. This ensures that the location of the leakage can be found quickly so that countermeasures can be introduced immediately. The sensor cable and point sensors can be combined at will. The monitoring electronics are available with or without locating. System calibration is not required. In addition, a line-break monitoring is integrated into each system.
Ultrasonic rodent repellents are small devices that emit high-frequency sound waves that are claimed intolerable to rodents. Humans and pets, however, cannot hear them. It is advised to use these devices in key areas where you have seen a rodent, or where you have seen signs of one (droppings, track marks, etc.). To the rodents, the frequencies will sound like a loud jackhammer.
The powerful sound waves generated by the transducers are within the hearing range of many rodents and cause them pain and discomfort. Sometimes the rodents will leave the area being protected immediately, and at other times it will take as long as four to six weeks before there is a significant reduction in infestation.
The area where the machine is installed should have at least three surfaces i.e., ceiling, side walls and floor to have maximum bouncing/reflection of sound waves. Partitions reduce the effective area of the unit. The machine should be directed towards any hard surface for maximum bouncing effect.