Conductive Level Controller 61F-GP-N8 Compact Plug-in Level Controllers for Single or Two-point Level Control of Conductive Materials (Liquids and Solids) Level Controllers • Wide range of models: long-distance, high and low-sensitivity, and two-wired types available. • 24/100/110/120/200/220/230/240 VAC operation possible. • Easy installation on DIN track. • Low-voltage (AC) electrodes. • Red LED operation indicator provided. • Conforms to EMC and LVD Directives. • UL/CSA approved. Model Number Structure ■ Model Number Legend 61F-GP-N8@ 1 2 3 1. Plug-in Type 2. Compact 8-pin Type 3. Applications None: General-purpose type L: Long-distance type H: High-sensitivity type (reverse acting) HY: High-sensitivity type (standard acting) D: Low-sensitivity type R: Two-wired type Ordering Information ■ List of Models Application General-purpose type Long-distance type High-sensitivity type Model number 61F-GP-N8 2 km 61F-GP-N8L 2KM 4 km 61F-GP-N8L 4KM 61F-GP-N8H Low-sensitivity type 61F-GP-N8D Two-wired type 61F-GP-N8R Conductive Level Controller 61F-GP-N8 E-5 ■ Accessories (Order Separately) Selection Guide for Electrode Holders and Separators Electrode Holders Applications For city water and other general-use electrodes. Easy-to-replace separate versions facilitate maintenance of electrodes. When mounting space is limited. Special 3-pole holder of small size and light weight. Ideal for soft drink vendors, etc., where only limited space is available. For low specific liquids. Used for sewage, sea water, etc., having a low specific resistance. In sewage use, electrode holders must be installed 10 to 20 cm apart from one another. For acids, alkalis and sea water, electrode holders may be as much as 1 meter apart to operate properly. When resistance to high pressure is required. Ideal for use in tanks where temperature or pressure inside the tank is high, e.g. 250°C Mounting style Flange Screw Flange Screw Insulator material Phenol resin Phenol resin Ceramics Teflon Max. temperature 70°C No. of electrodes 1 --- --- BF-1 BS-1 3 PS-3S PS-31 --- --- 150°C (without water drips or vapor on the 250°C (without water surface of the electrode holder) drips or vapor on the surface of the electrode holder) Electrode Separators No. of electrodes Model 1 F03-14 1P 3 F03-14 3P Selection Guide for Electrodes, Connecting, and Lock Nuts Applicable liquids Material Models for individual electrode assembly components Electrode (1m long) Model Indication mark Connecting nut Model Inscription Lock nut Model Inscription Purified city water, industrial water, sewage Equivalent to SUS 304 (AISI-304) F03-01 SUS201 1 line F03-02 SUS201 --- F03-03 SUS201 --- Purified city water, industrial water, sewage, dilute alkaline solution SUS316 (AISI-316) F03-01 SUS316 2 lines F03-02 SUS316 6 F03-03 SUS316 316 E-6 Conductive Level Controller 61F-GP-N8 Specifications ■ Ratings and Characteristics Model/Items General-purpose Controller 61F-GP-N8 Long-distance Controllers 61F-GP-N8L 2KM (for 2 km) 61F-GP-N8L 4KM (for 4 km) High-sensitivity Controllers 61F-GP-N8H 61F-GP-N8HY (see note 1) Low-sensitivity Controller 61F-GP-N8D Two-wired Controller 61F-GP-N8R For control of liquids with high specific resistance such as distilled water For control of liquids with low specific resistance such as salt water, sewage water, acid chemicals, alkali chemicals For control of ordinary purified water or sewage water used in combination with twowired-type electrode holder (incorporating a resistor of 6.8 kΩ) For control of ordinary For control of ordinary purified water or sew- purified water in casage water es where the distance between sewage pumps and water tanks or between receiver tanks and supply tanks is long or where remote control is required. Supply voltage 24, 100, 110, 120, 200, 220, 230 or 240 VAC; 50/60 Hz Operating voltage range 85% to 110% of rated voltage Interelectrode voltage 8 VAC 24 VAC 8 VAC Interelectrode current Approx. 1 mA AC max. Approx. 0.4 mA AC max. Approx. 1 mA AC max. Power consumption Approx. 3.5 VA max. Interelectrode operate resistance Approx. 0 to 4 kΩ Approx. 0 to 1.3 kΩ (for 2 km) Approx. 0 to 0.5 kΩ (for 4 km) Approx. 15 kΩ to 70 kΩ (see note 3) Approx. 0 to 1.3 kΩ Interelectrode release resistance Approx. 15 k to ∞ Ω Approx. 4 k to ∞ Ω (for Approx. 300 k to ∞ Ω Approx. 4 k to ∞ Ω 2 km) Approx. 2.5 k to ∞ Ω (for 4 km) Approx. 15 k to ∞ Ω Response time Operate: 80 ms max. Release: 160 ms max. Cable length (see note 2) 1 km max. 2 km max. 4 km max. 800 m max. Control output 1 A, 250 VAC (Inductive load: cosφ = 0.4) 3 A, 250 VAC (Resistive load) Ambient temperature Operating: −10°C to 55°C Ambient humidity Operating: 45% to 85% RH Insulation resistance (see note 3) 100 MΩ max. (at 500 VDC) Dielectric strength (see note 4) 2000 VAC, 50/60 Hz for 1 min. Life expectancy Electrical: 100,000 operations min. Mechanical: 5,000,000 operations min. 50 m max. 1 km max. Level Controllers Controlling materials and operating conditions Approx. 0 to 2 kΩ Note: 1. The relay in the 61F-GP-N8H de-energizes when there is water present across the electrodes, whereas the relay in the 61F-GP-N8HY energizes when there is water present across the electrodes. 2. The length when using completely-insulated, 600-V, 3-conductor (0.75 mm2) cabtyre cables. Usable cable lengths will become shorter as the cable diameter or number of conductors becomes larger. 3. 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. 4. Possible to use with 10 kΩ or less, however, this may cause reset failure. Conductive Level Controller 61F-GP-N8 E-7 Connections ■ Internal Circuit Diagrams 61F-GP-N8/-N8L/-N8D/-N8HY Power supply 61F-GP-N8R 61F-GP-N8H Power supply 24 V Power supply 24 V 24 V Control circuit Control circuit Control circuit 8V 24 V 8 V (see note) 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 200 V 8V 24 V Control circuit (See note 1 below.) Contactor (See note 2 below.) PS-3S Stop Start THR Tank Reservoir Note: 1. The diagram shows the connections for water supply. When draining, change the connection from terminal 2 to terminal 3. 2. 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. 3. When connecting the Surge Suppressor Unit, wire as shown in the following example (with three electrodes). Discharge start voltage 90 V ±20 VDC Impulse withstand voltage 200,000 V (1 x 40 µs) Impulse withstand current 6,000 A (1 x 40 µs) 61F-03B Ground Internal Connections Ground 61F-04B 61F-03B Level Controllers Specifications E2 E1 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. 2. 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 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 PS-4S/-4SR PS-5S/-5SR 34 dia. E2 92 80 E1 26 E2 E3 E1 E1 E4 E4 E3 13 40 E2 E3 80 20 Mounting Holes Screw Holes Used with coupling PF2 Used with mounting bracket 65-dia. hole PS-31 PF1/2 Parallel thread 38.5 32 7 12 11 11 dia. Mounting Holes 4 dia. Electrode SUS304 Dust preventive rubber cap (optional) 3 M3 PF1/2 Rubber packing 26 (see note) 29.5 dia. Note: Standard holder construction includes three integral 300-mm-long electrodes. However, a model having 1,000-mm-long electrodes is available on request. BF-1 Cast iron Two M5 x 25 mounting screws Terminal bolt SUS201 (M6) Nut (M6) 60 26-dia. hole 48 33 48 dia. 20 dia. Two, 6-dia. holes 17 14 (49) 72 E-10 Conductive Level Controller 61F-GP-N8 18 23 BS-1 Width across flats: 20 Two M4 Terminal bolt P = 0.7 M18 SUS304 (M4) P=0.7 P = 1.5 24 dia. Nut (iron) 12 50 M18 P=1.5 (fine screw thread) 39 51 101 Electrode Separators F03-14 1P (for Single Pole) F03-14 3P (for Three Poles) 6.5 dia. Three, 7 dia. Level Controllers 20 41 dia. 28 dia. Connecting Sockets Track Mounted Socket PF083A-E Eight, M3.5 x 7 sems screws Terminal Arrangement/ Internal Connections (Top View) 7±0.2 Two, 4.2-dia. holes 52 max. Mounting Holes 25 dia. Two, M4 or 4.5-dia. holes 21 max. 41 max. Back Connecting Socket PL08 Terminal arrangement/ Internal Connections (Bottom View) Two, 2-dia. holes 50.5 max. Mounting Holes Two, 3.5-dia. or M3 Controller mounting holes Two, 3.5-dia. or M3 socket mounting holes 30 dia. 31-dia. hole 35 max. Approx. 20.5 Conductive Level Controller 61F-GP-N8 E-11 Holding Brackets To mount the 61F-GP-N8 Conductive Level Controller on the PF083A Track Mounted Socket, use the PFC-N8 Mounting Brackets attached to the Socket as an accessory. PFC-N8 Approx. 80 Surge Suppressor Unit 61F-03B 61F-04B 61F-03B 61F-04B PF113A-E Application Examples • Level control in tanks, reservoirs, sewage plants, underground wells, mixing plants etc. • Level control for element protection in pipes, channels, and irrigation systems. • Flow detection in pipes, channels, and irrigation systems. • Ice bank control in cold drink dispensers, ice makers, water chillers, bulk milk tanks, etc. • • • • Dispensing of liquids by volume. Indication of liquid buildup due to filter blockages. 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. E1 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. When the required length of the electrode is more than 1 m, use a separator at each joint of two electrodes so as to prevent the electrodes from contacting one another. Note: Avoid use of the separators in dust-containing liquids. Usually, electrodes are used in a set of three: long, medium, and short. Connect the short electrode to E1, the medium electrode to E2, and the long electrode to E3. Make E3 at least 50 mm longer than E2. E-12 Conductive Level Controller 61F-GP-N8 E2 E3 1m Min 50 mm 1m Electrodes are in actual contact with the liquid. Standard electrodes are made of stainless steel and usable in purified water, sea water, sewage, acid (except acetic acid, sulfuric acid, etc.) and alkaline liquids, although they may corrode depending upon the temperature and working conditions. Note that the 61F-GP-N8 Conductive Level Controller is capable of controlling liquids with specific resistances of up to 30 kΩ-cm when the Controller employs a PS-3S electrode holder with the electrode(s) submerged to a depth of 30 mm max. Kind of water Specific resistance Applicable type City water 5 to 10 kΩ-cm Standard type Well water 2 to 5 kΩ-cm Standard type Industrial water 5 to 15 kΩ-cm Standard type Rainwater 15 to 25 kΩ-cm Standard type Sea water 0.03 kΩ-cm Low-sensitivity type Sewage 0.5 to 2 kΩ-cm Low-sensitivity type Distilled water 100 kΩ-cm or less High-sensitivity type Over 100 kΩ-cm Consult OMRON Precautions Level Controllers ■ How to Mount Electrodes Connecting Electrodes to Electrode Holders Electrode holder Clamp screw 3. Tighten the electrode with the two clamp screws. Connecting nut 1. Spin a lock nut and a spring washer onto the electrode. Spring washer 4. Secure the connecting nut by tightening the lock nut and spring washer. Lock nut Electrode 2. Fully fit the electrode into the connecting nut attached to the electrode holder. Connecting One Electrode to Another Electrode Lock nut Spring washer Connecting nut Spring washer 2. Fully fit the electrode into the connecting nut attached to the electrode holder. 3. Tighten the electrode with the two clamp screws. 4. Secure the connecting nut by tightening the lock nut and spring washer. 1. Spin a lock nut and a spring washer onto the electrode. Conductive Level Controller 61F-GP-N8 E-13 ALL DIMENSIONS SHOWN ARE IN MILLIMETERS. To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527. Cat. No. F043-E1-02 E-14 In the interest of product improvement, specifications are subject to change without notice. Conductive Level Controller 61F-GP-N8