User manual OMRON 61F-GP-N8 DATASHEET

[. . . ] Special 3-pole holder of small size and light weight. Ideal for soft drink vendors, etc. , where only limited space is available. Screw Phenol resin For low specific liquids. Used for sewage, sea water, etc. , having a low specific resistance. [. . . ] Usable cable lengths will become shorter as the cable diameter or number of conductors becomes larger. The insulation resistance and dielectric strength indicate values between power terminals and electrode terminals, between power terminals and contact terminals, and between electrode terminals and contact terminals. Possible to use with 10 k or less, however, this may cause reset failure. Conductive Level Controller 61F-GP-N8 E-7 Level Controllers Supply voltage 24, 100, 110, 120, 200, 220, 230 or 240 VAC; 50/60 Hz Connections Internal Circuit Diagrams 61F-GP-N8/-N8L/-N8D/-N8HY Power supply 24 V Control circuit 8 V (see note) 61F-GP-N8H Power supply 24 V Control circuit 24 V 61F-GP-N8R Power supply 24 V Control circuit 8V 2 Note: 24 V for the 61F-GP-N8HY. Automatic Water Supply and Drainage Control 1. Water Supply · Connect electromagnetic switch coil terminal A to terminal 2. · The pump stops when the water level reaches E1 and starts when the water level drops below E2. 200-VAC power supply 2. Drainage · Connect the electromagnetic switch coil terminal A to terminal 3. · The pump starts when the water level reaches E1 and stops when the water level drops below E2. 61F-GP-N8 MCCB 0V 8V 24 V Control circuit 200 V (See note 1 below. ) Contactor (See note 2 below. ) THR Tank PS-3S Stop Start Reservoir Note: 1. The diagram shows the connections for water supply. When draining, change the connection from terminal 2 to terminal 3. The earth terminal must be earthed. E-8 Conductive Level Controller 61F-GP-N8 Operation The Conductive Level Controller consists of a plug-in controller connected to a set of stainless steel probes. These are cut to length and inserted vertically into the liquid. A low voltage is applied between these probes and the earth probe (or tank, if it is electrically conductive). The water provides a current between the earth probe and the high-level probe. The output relay in the Controller is energized when the water level reaches the high-level probe and de-energized when the water level falls below it. For two-point control a low-level probe is used as well. In this case the relay does not de-energize until the water level falls below the low-level probe. Using the low-level probe allows a wide differential between switching a pump on and off, and can avoid excessive pump operation during tank emptying or filling. If this differential is not required, the low-level probe need not be connected. Surge Suppressor Unit (61F-03B/04B) A high-capacity protective device is available which protects 61Fseries Floatless Level Controllers against faults arising from electrical surges (such as indirect strokes of lightning) when the Controllers are employed in elevated water tanks or in high-altitude locations. When connecting the Surge Suppressor Unit, wire as shown in the following example (with three electrodes). Discharge start voltage Impulse withstand voltage Impulse withstand current 90 V ±20 VDC 200, 000 V (1 x 40 µs) 6, 000 A (1 x 40 µs) 61F-03B Internal Connections 61F-03B 61F-04B Ground Ground E1 E2 E3 Connection Sockets PF113A-E Track-mounted Socket PL11 Back-connecting Socket Precautions 1. Mount the Surge Suppressor Unit as close to the Controller as possible. When grounding the Surge Suppressor Unit in the vicinity of the Controller, connect the ground side of the Surge Suppressor Unit to electrode E3. Long distance 61F-03B Ground Conductive Level Controller 61F-GP-N8 E-9 Level Controllers Specifications Dimensions Note: All units are in millimeters unless otherwise indicated. 61F-GPN8 91 PF083A-E Electrode Holders PS-@S 9-dia. rubber bushing (inner) PF2 parallel thread (effective dia. : 58. 135) PS-3S/-3SR 34 dia. E2 PS-4S/-4SR E3 E2 PS-5S/-5SR E3 E2 80 92 E3 13 40 26 20 80 E1 E4 E1 E4 E1 Mounting Holes Used with coupling PF2 Screw Holes Used with mounting bracket 65-dia. [. . . ] Pollution/foul water detection for rivers, drains, etc. Alarm control warning of abnormal or dangerously high or low levels. Application When using electrodes in sea water or sewage, provide a sufficient interval (normally 1 m) between the electrodes. If the sufficient interval cannot be provided, employ a low-sensitivity-type Floatless Level Controller. When taping one of the electrodes to prevent it from contacting the other electrodes in water, do not tape the electrode entirely but leave at least 100 mm of its end uncovered. [. . . ]