Water leak detection equipment can be broadly divided into three categories:
1. Sound – the detector allows the identification of the leak noise produced by pressurized water escaping the pipe.This is the oldest and most widely used method.
2. Tracer gas – the detector picks up traces of a gas, normally Helium or a mix of Nitrogen (approx 97-98%) + Hydrogen (2-3%). Good alternative to sound in noisy environments or small leaks.
3. Temperature – the detector identifies small temperature differences in the ground caused by the water leaking – only works when there is enough differential between the water and the ground around it. Useful in hot water systems where there is enough temperature diferential.