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Floatless Level Controller 61F

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Automatic Water Supply and Drainage Control Ideal for level control of any conductive liquid. Both general-purpose and panel-use models available. Incorporates an arrester for surge and induced lightning protection. Wide range of models: Long-distance, high- and low-sensitivity, two-wire, etc. LED indicator for quick operation check. | omRon Floatless Level Controller 61F Automatic Water Supply and Drainage Control Ideal for level control of any conductive liquid Both general-purpose and panel-use models available Incorporates an arrester for surge and induced lightning protection Wide range of models Long-distance high- and low-sensitivity two-wire etc. LED indicator for quick operation check Conforms to EMC IEC standards 61F-GP-N -N8 -GPN-V50 -GPN-BT -GPN-BC UL CSA approved 61F-GP-N8 -GPN-V50 -GPN-BT -GPN-BC Operating Principle Unlike ordinary level switches that use a float for level detection the 61F Floatless Level Controller uses electrodes to electrically detect the liquid level. The following figures illustrate this simple operating principle. However in practice with only two electrodes ripples on the surface of the liquid cause the Controller to jump and start shortening pump and other equipment life. This problem can be solved by adding another electrode to form a self-holding circuit. The additional electrode E2 is connected in parallel with E1 as shown below. 8 VAC Relay contacts b a m Magnetic contactor To Relay contacts No current flows between E1 and E3. Magnetic contactor To Ei Es E2 PUMP OFF PUMP ON When electrode E1 is not in contact with the conductive liquid the electrical circuit is open and no current flows between electrodes E1 and E3. Consequently relay X does not operate. Relay X s NC contacts normally closed b in the figure remain closed. However when liquid is supplied to the tank so that the liquid contacts or immerses E1 the circuit closes. Relay X operates and electrical devices connected to the NO normally open a in the figure contacts of the relay begin operation. As shown in the above figure when the holding circuit relay is energized contact a2 its NO contact is closed. The electrical circuit made through the liquid and the electrodes is then retained by E2 and E3 even when the liquid level falls below E1 as long as contact a2 is closed. When the liquid