Technical specifications:

Operating voltage: 5 VDC

Operating current: less than 10 mA

Operating temperature: -25 °C to 70 °C (non-freezing)

Make-up water flow rate: greater than 5 L/min at 1 bar

Flow frequency: F1 = 8.1Q − 3

                  F2 = 13Q − 6.5 (where F is frequency in Hz and Q is flow rate in L/min)