Testing of Felson WATER ALARM
Extract of Test Report, ref. no. 270-0-0738

Purpose of The Testing:
Examination of the functioning of the WATER ALARM as regards ability to detect leakages in water installations and to not go off by mistake. The examination is focused on the part of the test unit which dispatches information concerning the state of the alarm to the software. The software itself is not examined.

The Test Unit:
The test unit WATER ALARM has been developed by FELSON and consists of two temperature detectors, of which one measures the temperature of the water pipe and the other measures the room temperature close to the first detector. If there are no leakages and no consumption, the two temperatures will be identical. In case of leakages, the temperatures will be different provided that the temperature of the water (typically earth temperature) is different from the temperature of the room in which the WATER ALARM is placed.

Testing Procedure:
The testing procedure has been developed by Teknologisk Institut (The Technological Institute) and is described in detail in the test report.

Conclusion:
On the basis of the testing, the functional principles of the WATER ALARM have been found suitable for establishment as to whether there are any leakages down to 40ml/minute (dripping) in the water installation, and the tests indicate that correct information is dispatched for further processing in the software. The software has not been examined.

Prerequisites for the WATER ALARM working according to intention are:
- there is a difference between the water temperature outside the room in which the WATER ALARM is located and the room temperature. In connection with the testing, the WATER ALARM has worked according to intention, where mentioned difference has been 4.5° C;
- the distance along the water pipe between the wall and the WATER ALARM shall not be great; during the testing, the distance has been 1.2 m, but it was found that the distance could be greater;
- there are periods during which there is no water consumption in the water installation to be examined for leakages; this period shall be used as reference.

Århus, 31st August 2000
Jens Brusgaard Vestergaard
Graduate Engineer Teknologisk Institut