Conductive Level Sensors
Conductive Level Sensors
Conductivity Level Switch. SLW conductivity level switch is based on the principle of measuring level through the electrical properties of the process material. As the name suggests, conductivity based level switches and sensors sense the level of water or other conductive liquids that have free ions.
A conductive liquid contacting both the longest probe (common) and a shorter probe (return) completes a conductive circuit. Conductive sensors are extremely safe because they use low voltages and currents. … In some liquids and applications, maintenance can be an issue. The probe must continue to be conductive.
Conductivity level switches make use of conductivity sensing technology or conductance method for liquid level detection. Conductance method of liquid measurement and control is considered to be very simple in operation. Their working depends upon the electrical conductance or conductivity of the process liquid being measured. The liquid under measurement can typically conduct a current with a low voltage power source having voltage usually less than 20 Volts. “One common way to set up an electrical circuit is to use a dual-tip probe that eliminates the need for grounding a metal tank. Such probes are generally used for point level detection, and the detected point can be the interface between a conductive and nonconductive liquid
Key features of conductivity level sensors are listed below:
These switches provide extremely cost effective solution for liquid level measurement.
They are very simple to install and safe to use.
They usually give maintenance free service.
They generally have rugged construction.
They are available in different models. Some of them are provided with fixed rigid rods, some with removable rigid rods and many others with pendular electrodes. These electrodes are basically connected to the cable housings.
These liquid level sensors are designed in such a way that they can work with almost all conductive mediums. Besides, they can provide level control up to 5 or more different points.
Conductance based level switches can be adapted to work with variety of applications. Following are the major applications of these liquid level switches:
They can be applied for both high/low level alarm indication as well as pump valve control.
They can be employed in cases of run-dry protection and tanks overfill also.
Carlo Gavazzi comprehensive range of level detection products is well suited to solve most level control applications. Our range is able to detect conductive and non-conductive liquids, granulates, grains, and plastics.
We offer level sensors and level control relays for both on/off control and continuous monitoring of levels. We offer conductive probes and amplifiers, capacitive level sensors, ultrasonic sensors, magnetic level probes, and optical sensors.
Typical applications are for level control in wells and municipal water systems, protection of pumps, levels in grain elevators and feed conveyors, and level detection in vacuum delivery systems in the plastics industry.
Conductivity Level Switch
To avoid overflow
For maintaining a constant level to avoid material wastage
For switching off pumps when running dry and indicating an empty tank to avoid wear and tear and production stoppage
Conductivity level switches offer a wide range of customized options to meet any application’s needs. They are designed to control the level of all conductive mediums, offering up to 5 different points of level control. Models are available with fixed rigid rods, with removable rigid rods, or with pendular electrodes attached to the housing with cables. These switches suit applications involving both alarm point detection and on/off pump valve control. Installation is easy and operation is maintenance-free.
The probes work through the variation of the electrical resistance between the reference electrode and the level-control electrode. Conductivity level switches detect the level resistance when their electrodes are covered by the medium.
An electrically conductive tank wall can be used as the reference electrode. If the tank is made of plastic, concrete, or any other nonconductive material,