well 34 low 34 sensor 26 is submerged it cannot transmit a 34 one 34 as output terminal 28 has been deenergized as described above and does not supply voltage to 34 low 34 well sensor 26 the output terminal 23 continues to supply a 34 zero 34 to the solid state relay 20 so that motor 16 and pump 14 are 34 off 34 in this manner off on hunting and a desirable dead band or hystersis is provided when the water in the well reaches a safe level and submerges the 34 high 34 well sensor 29 a 34 one 34 is transmitted to input terminal 30 and connected input 43 of and gate 42 if the tank level is low with a level below tank 34 low 34 sensor 39 the sensor 39 does not conduct and a 34 zero 34 is present at input terminal 40 and connected input 47 of inverter 46 whose output 45 is consequently a 34 one 34 which appears at connected input 44 of and gate 42 the 34 one 34 at both and gate 42 inputs results in a 34 one 34 at the gate output 60 and its connected input 59 of or gate 58 the or gate output 61 is thus a 34 one 34 and the connected output terminal 28 supplies voltage to both 34 high 34 tank sensor 37 and 34 low 34 well sensor 26.