Level monitor, 1-channel, operating voltage 20,250 VAC / 20,250 VDC, output: two relays with changeover switch, response sensitivity: 0.2...100 kO, removable terminal blocks, electrode switching via built-in auxiliary relay, on and off delay 0.1...15 s adjustable, reliable differentiation between liquid and foam, galvanic isolation of input circuits from output circuits and supply voltage