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Electrical pump controlled circuit

2014-11-18 00:25  
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The automatic pump controller eliminates the need for any manual switching of pumps installed for the purpose of pumping water from a reservoir to an overhead tank . It automatically switches on the pump when the water level in the tank falls below a certain low level (L), provided the water level in the reservoir is above a certain level.Pump controls from Grainger keep tabs on how each of your heavy-duty pumps is running and whether your system is operating at your required flow rate. Monitor pumps with a required flow rate by incorporating a flow sensor and pump switches. Select a flow switch to redirect liquids to your backup pump when the flow rate drops. Keep pumps from running dry by monitoring the fluid levels in tanks using a float switch, flowmeter or other pump controls.This circuit controls the level of a tank using a bang-bang controlled electrical pump. The actual level of liquid is measured by a capacitive level-meter. The first inverter performs as a capacitance to frequency converter. It is a Schmitt oscillator and its frequency output decreases as the capacitance increases. The second inverter is a monostable which performs as a frequency to voltage converter (f/V). Its output is applied to the maximum and minimum level comparator inputs. Maximum and minimum liquid levels may be set by the potentiometers.The maximum level (1 max) may be preset between the limits: 65 pF less than C (1 max) less than 120 pF. The minimum level is presetable and the limits are: 0 less than C (1 min) less than 25 pF.

Single chip pump controller