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Water Leak Protection

Safeguard and Alarm for Water Leaks

Water Leak Protection
Water Leak Protection
This device was mainly designed for household appliances dealing with water. In the event of a leak — when a hydro-sensitive sensor is wet — the mains voltage is immediately cut off from the equipment, stopping the water flow and reducing the risk of electrocution.  
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Materials

Component list

Component List

Resistors

(SMD 1206 if not otherwise noted)

R1 = 3M9

R2 = 330 k

R3 = 22 k

R4 = 1 k

R5 = varistor 10D391K 

R6 = 47 Ω

 

Capacitors

C1, C2 = 100 n, SMD 1206

C3 = 100 µ / 16 V, electrolytic, SMD, Ø 5 mm

 

Semiconductors

D1 = 1N4007, DO213AB

LED1 = LED, red, 3 mm

T1 = BC337, SOT23

IC1 = CD4093, SOP14

 

Miscellaneous

Re1 = Relay 12 V, 2 × 8 A, e.g. RT42412

PSU = PCB power supply HLK-PM12

J1, J2 = 2-pole pin header

X1 = 4-pole screw terminal, 2/10″

X2 = 2-pole screw terminal, 2/10″

F1 = Fuse 500 mA 

Probe = MH-RD Sensor (see Figure 1)

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