
8
Pict. 7. Schematic diagram POW 12
1 - thermal switch
2 - display and keyboard plate
3 - driver plate
4 - power plate
5 - temperature sensor
6 - flow sensor
7 - heating unit
8, 9
- air block and flow sensors
10 - pressure switch
PE - terminal of the protective cable
E - electrode
G1, G2, G3, G4 - immersion heaters