Fluid level control schematic diagrams

Posted on Feb 6, 2014

The LM1830 fluid level detector circuit is a device intended to signal the presence or absence of aqueous solutions, featuring low external parts count, wide supply operating range, internally regulated supply and AC or DC output. In a typical application where the device is employed for sensing low water levels in a tank, a simple steel probe may

Fluid level control schematic diagrams
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be inserted in the top of the tank with the tank grounded. When the water level drops below the tip of the probe, the resistance will rise between the probe and the tank and the alarm will be operated. When a non-conductive container is used, the probe may be designed in a number of different ways like a simple phono plug or other probe designs such as conductive parallel strips on printed circuit boards. Many opportunities exist for a device that can reliably control the operation of pumps or solenoid actuated valves in fluid level control applications. Applications include sump pumps, washing machines, bilge pumps, humidifiers, plating baths, coffee makers, water and waste treatment plants, cooling towers, refrigeration equipment and many others. In the past these needs have been met by various mechanical arrangements such as float valves or diaphragm actuated switches. These devices were bulky, inaccurate and, because they contain moving parts, often unreliable with disastrous results when they fail. They are easily disabled by debris or environmental problems such as ice. They can be wery expensive when used to control the level of corrosive fluids such as detergents or plating baths, or when used to control large differences in depth such as in municipal water towers. Mechanical control devices are prone to false actuation in vehicular applications due to their own inertia. In many applications such as coffee makers,...

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