Liquid Leakage Sensor Amplifier/Liquid Leakage Sensor Amplifier with Disconnection Detection Function K7L-AT50/AT50D CSM_K7L-AT50_AT50D_DS_E_3_3 Reliable detection of a wide variety of liquids ranging from water to liquid chemicals with low conductivity. Four sensing ranges available * Provides stable detection of liquids with impedance as high as 50 M using inter-electrode resistance detection. Detection of IPA and pure water possible. * Higher noise immunity with a noise canceller circuit connected to a 3-conductor cable. * Prevents electrode corrosion with an AC detection method. * The power supply circuit and detection circuit are isolated, allowing several Amplifiers to be installed in the same place. * After a disconnection is detected, operating status is held to eliminate instability due to contact of the disconnected part.*1 * Series includes an Explosion-proof Barrier (Sold Separately) to enable usage in hazard atmospheres. * CE Marking and UL/CSA certification. *2 *1 For the K7L-AT50D. *2 UL File No.E138234 CSA File No. LR95291-21 CE EMI : EN55011 EMS : EN61000-6-2 For the most recent information on models that have been certified for safety standards, refer to your OMRON website. Refer to "Safety Precautions" on page 7. Features Sensing Bands boast high degree of chemical resistance. The K7L can be used in a wide range of applications, from semiconductor production installations to food-processing equipment. Inter-electrode Resistance Detection Noise Canceller Function (Patent Pending) Stable detection of liquids with impedances of up to 50 M and common water. Four sensing ranges are available, ensuring detection suited to the application. The K7L incorporates a noise canceller circuit that uses a 3-conductor cable, ensuring a high level of noise immunity. Fresh water, pure water, distilled water, plating liquids, chemical liquids, IPA (isopropyl alcohol) Connecting cable AC Detection Method The K7L internally oscillates AC signals provided to the Sensing Band, protecting the Sensing Band from electric corrosion and ensuring safe operation. Multiple Installation The power supply circuit and the detection circuit are isolated, allowing several Amplifiers to be installed in the same place. Oscillator Detector Current 1 K7L-AT50/AT50D Detection of Condensation and Liquid Leakage at Semiconductor Production Installations Detection is also possible for condensation inside cleaning devices and liquid leaked to the surroundings. Sensing Band with Excellent Chemical Resistance SUS316 and polyethylene are used for the Sensing Band's core and sheath to ensure high resistance to both acidic and alkaline liquids. Liquid Leakage Detection for Measuring Baths in CMP Devices Detection of Liquid Leakage at Pipe Joints for Liquid Chemical Tanks Liquid leakage at a pipe joint can be detected by wrapping the Sensing Band around the joint. Detection of Cleaning Fluid Level for Plating Devices The level of pure water is detected inside plating baths. High sensitivity allows high-accuracy control to prevent cleaning irregularities. Note: Be sure to ground the baths if two or more K7L Sensors are used in the same tank in an explosion-prevention area. Liquid leaked to drain pans can be detected to prevent damage to devices and cleaning irregularities for wafers. 2 K7L-AT50/AT50D Ordering Information Product name Amplifier Model Liquid Leakage Sensor Amplifier K7L-AT50 Liquid Leakage Sensor Amplifier with Disconnection Detection Function K7L-AT50D F03-15 F03-16PE Sensing Band F03-16PT Sensors F03-16SF F03-16SFC F03-16PS Point Sensor F03-16PS-F F03-25 Mounting Brackets and Stickers F03-26PES Sensing Band Stickers F03-26PEN F03-26PTN Track-mounted Socket Point Sensor Mounting Brackets F03-26PS Round terminals can be used. P2RF-08 Round terminals cannot be used. P2RF-08-E Terminal Blocks F03-20 Characteristics Ambient temperature Operating: -10 to +55C Ambient humidity Operating: 45% to 85% Insulation resistance 10 M at 100 VDC between case and current-carrying parts Dielectric strength 1,000 VAC at 50/60 Hz for 1 min between case and current-carrying parts Power consumption 1 W max. Response time Operate:800 ms max. Release:800 ms max. When turning ON power: 2 s max. Weight Approx. 14 g Specifications Rated power supply voltage 12 to 24 VDC (Allowable voltage fluctuation range: 10 to 30 VDC) 0 to 50 M, variable Range 0: 0 to 250 k. Range 2: 0 to 5 k. Operate resistance Range 1: 0 to 600 k Range 3: 0 to 50 k Note: The range is set using the DIP switch on the side of the Sensor Amplifier. (Refer to DIP Switch Settings.) Set the corresponding pin of the DIP switch in the up position. (For range 0, set all 3 pins in the down position.) The adjuster (ADJUST) on the top of the Sensor Amplifier sets the resistance value for detection within the set range. It is factory-set to the upper limit. (Normally, the K7L can be used with the adjuster at this setting.) With any range, resistance values can be set from 0 .. Disconnection detection function * Detection signal: 10 VDC max., 200 ms Detection time: 10 s max. Recovery: Operation is recovered by resetting the power supply. Release resistance 105% min. of operate resistance Output configuration NPN open-collector transistor output with 100 mA at 30 VDC max. for both liquid leakage detection and disconnection detection. Note: If the rightmost pin of the DIP switch on the side of the Sensor Amplifier is set to the down position, the output turns ON when liquid is detected; if it is set to the up position, the output turns OFF when liquid is detected. Wiring distance Connecting cable: 50 m max. Sensing Band length: 10 m max. Note: These values are possible on condition that a completely insulated 3-conductor VCT cable with a thickness of 0.75 mm2 and a dielectric strength of 600 V is used together with a Liquid Sensing Band specified by OMRON. (A 0.2-mm2 cable can also be used.) Accessories Terminal Block Screwdriver for ADJUST Terminator K7L-AT50 1 1 --- K7L-AT50D 1 1 1 K7L-AT50D-S 1 1 --- * For the K7L-AT50D. 3 K7L-AT50/AT50D Nomenclature and DIP Switch Settings PW OMRON Corporation Power indicator (green) (Lit when power is supplied.) K7L-AT50D SENSOR RANGE MODE LIQUID LEAKAGE SENSOR MODE(OUTPUT) NC Output indicator (red) (Lit when output is ON.) Resistance adjuster OUT NO SENSOR RANGE 0250K ADJUST 0600K 05M 050M Setting Sensing Range DIP switch Range number Sensing range Range 0 0 to 250 k Range 1 0 to 600 k Range 2 0 to 5 M Range 3 0 to 50 M DIP switch Output mode Output OFF when liquid leakage/ Disconnection* detected Output ON when liquid leakage/ Disconnection* detected * Disconnection detection is supported only by theK7L-AT50D. Countermeasures Against Noise Noise Canceller Function for Highly Sensitive Impedance Detection Connected with 3-conductor Cable that Offsets Inductive Noise (Patent Pending) The K7L Liquid Leakage Sensor Amplifier detects liquids with impedance as high as 50 M and connects to the Sensing Band through a cable that can be extended up to 50 meters. Countermeasures against external noise are especially important for the Sensing Band and connecting cable because they pick up external noise like an antenna. The K7L incorporates the noise canceller function described below. A VCT cable with three conductors (lines) is used. Line 1 is connected to the Sensing Band and line 2 is left open. Lines 1 and 2 are almost in the same position and thus will experience the same noise level. The K7L obtains the difference between these signals. This means that the noise signals in lines 1 and 2 are offset against each other and a reading for the signal, without inductive noise, can be made. F7L Sensing Band Signal transmission circuit Signal transmission line 4 2 3 Line 1 Line 2 Subtraction circuit Connecting cable Resistance measurement circuit 4 K7L-AT50/AT50D Connections External Connections K7L-AT50 K7L-AT50 5 4 6 Level input 1 3 7 Level input 2 2 8 4 3 2 OUT- 100 mA at 30 VDC max. Signal transmission Connecting cable (0.2 mm2 min.) 2 3 4 F03-20 Terminal Block OUT+ Open-collector output Sensing Band Use a class 2 power supply for the DC power supply if UL/CSA or CE Marking compliance is required. 1 Note: Always use a 3-conductor cable for wiring and connect to terminals 2, 3, and 4 on the Unit. Connect the Sensing Band between terminals 2 and 4 or terminals 3 and 4. 12 to 24 VDC Connection Examples Connection as an NPN Output 6 Connection as an PNP (Equivalent) Output 5 6 5 Load Load Load power supply Load power supply K7L-AT50D Open-collector output 100 mA at 30 VDC max. (Bottom view) K7L-AT50D COM- Common Signal transmission 4 6 Level input 1 3 7 Level input 2 2 8 Connecting cable (0.2 mm2 min.) F03-20T Terminator 2-4 4-2 BURN OUT+ 5 4 3 2 Disconnection detection output OUT+ 2 3 4 F03-20 Terminal Block Liquid leakage detection output Sensing Band * Use a class 2 power supply for the DC power supply if UL/CSA or CE Marking compliance is required. 1 - Note: Always use a 3-conductor cable for wiring and connect to terminals 2, 3, and 4 on the Unit. Connect the Sensing Band between terminals 2 and 4 or terminals 3 and 4. 12 to 24 VDC Stripping and Connecting Terminals 1. Cut into the Sensing Band approximately 4 to 6 cm in from the end as shown in the diagram below. 2. Strip away approximately the last 9 mm of the sheath to expose the core (SUS line). 3. To connect to the Terminal Block, push down the top of the terminal with a screwdriver and insert the core from the side. More Sensing Bands can be connected simply by wiring in an arch shape. 4 to 6 cm 9 mm Insert Exposed part of core F03-20 Terminal Block Note: When you are finished working, sufficiently confirm that there is an electrical connection. * You can use a commercially available screwdriver, but we recommend either 1) a 210-350/01 Screwdriver or 2) a 209-132 Operating Tool from Wago. Information: //www.wago.com 5 K7L-AT50/AT50D Functions Disconnection detection function (K7L-AT50D) Operation While Monitoring for Liquid Leakage * Short-wave signals (2.5 VAC, 3.75 Hz) for liquid leakage detection are output from terminal 4 of the K7L. * When there is no liquid leakage, the liquid leakage detection signals that are output are interrupted by the Terminator and the core of the Sensing Band will form an open loop. Signals interrupted by Terminator. 3 7 2 4 3 2 4 5 6 2 3 4 2.5 VAC (3.75 Hz) Operation While Monitoring for Disconnection * Output of disconnection detection signals starts within 2 s of power being supplied to the K7L and is repeated at 7-s intervals. * Disconnection signals are DC signals of 10 V max. that are output for approximately 200 ms. During this time, the K7L is in disconnection monitoring mode, i.e. it monitors for disconnections only and the liquid leakage detection signals are stopped. * If there is no disconnection, the disconnection detection signals (10 VDC) that are output pass through the Terminator and return to the K7L. The K7L takes this as normal, i.e., there is no disconnection. K7L 1 3 7 2 4 3 2 4 6 2 3 4 4 5 6 3 7 2 K7L 8 1 Operation at Disconnection Detection * If there is a disconnection, the signals will be interrupted at the place where the disconnection occurred, and will not return to the K7L. * If the signals do not return when the K7L is in disconnection monitoring mode, it will determine that a disconnection has occurred. The output indicator will flash, and the disconnection output will turn ON/OFF depending on the position of the DIP switch (right). K7L 8 2 3 4 * When liquid leakage occurs within the sensing range, the liquid leakage detection signals output from terminal 4 are input to terminal 2 through the leaked liquid. * The voltage of the input signals will vary with the resistance of the leaked liquid. This voltage is compared with the detection level set at the K7L. * As a result of the comparison, if the K7L determines that liquid leakage has occurred, the K7L's output LED will light, and the liquid detection output will either turn ON or OFF. 4 3 2 Operation at Liquid Leakage Detection 5 Disconnection detection signals are not interrupted by the Terminator and return to the K7L. 10 VDC max., 200 ms Signals are interrupted where the disconnection occurred. 1 3 7 2 4 3 2 4 5 6 2 3 4 8 K7L 8 1 Note: 1. Disconnection detection is only performed between terminals 2 and 4. Therefore, be sure to connect the Sensing Band between terminals 2 and 4. 2. The K7L will switch from liquid leakage detection to disconnection detection if either of the following conditions occur while liquid leakage is detected. * Disconnection occurs between the K7L and the place where liquid is leaked. * While liquid leakage is detected, disconnection occurs between the place where liquid is leaked and the Terminator (F03-20T) and, subsequently, the leaked liquid is removed (e.g., wiped up or dried). 3. During disconnection detection, liquid leakage will not be detected. Once disconnection has been detected, reset the power supply to stop disconnection detection. 6 K7L-AT50/AT50D Safety Precautions Precautions for Correct Use WARNING This product is not designed or rated for ensuring safety of persons either directly or indirectly. Do not use it for such purposes. Precautions for Safe Use Observe the following points to ensure safe operation. 1. Be sure to use a power supply voltage within the specified range. 2. Do not use the product in locations subject to flammable gases or combustible objects. 3. Insert the connection points into Sockets until the connection is locked securely. 4. Do not short-circuit loads connected to output terminals. 5. Be sure to connect the power supply with the correct polarity. Do not use the Encoder under ambient conditions that exceed the ratings. Installation Attach to a panel of thickness 1 to 5 mm. Do not install in the following locations. 1. Locations subject to shock or vibration 2. Locations where the temperature or humidity lies outside the specified range, or where condensation is likely to occur (To detect liquids with high impedances, do not use in locations with high humidity.) 3. Locations subject to dust 4. Locations subject to corrosive gases (particularly sulfide and ammonia gases) 5. Outdoors or locations subject to direct sunlight 6. Near devices that generate strong high-frequency noise (e.g., highfrequency welding devices etc.) Application Precautions You must allow sufficient leeway in ratings and performance, and provide proper fail-safe or other safety measures when using these products in any of the following applications. Be sure also to consult with your OMRON representative before actually attempting any of these applications. 1. Applications under conditions or environments not specified in user documentation 2. Applications for nuclear control systems, railroad systems, aviation systems, vehicles, combustion systems, medical equipment, amusement machines, or safety equipment 3. Applications that may have a serious influence on lives and property and thus require particularly attention to safety Dimensions (Unit: mm) Terminal Block * F03-20 Liquid Leakage Sensor Amplifier K7L-AT50/AT50D 29.1 3 5.8 3 23.1 17.5 5x3=15 K7L-AT50D SENSORLEAKAGE 12.8 2.5 25 3.2 PW K7L-AT LIQUID 50D 5.8 17 3.2 46 3.5 OUT ADJU ST Mounting Hole Dimensions 28.8 Two, M3 230.2 Terminator * F03-20T 24.1 3 18.1 Mounting Hole Dimensions 3 Two, M3 25 3.2 3.2 5.8 12.5 180.2 5.8 17 3.5 3.5 * The Terminal Block is made of nylon 66. Mount the Terminal Block in locations not subject to liquid chemicals using M3 screws. 7 K7L-AT50/AT50D Track-mounted Sockets * P2RF-08 (Round terminals can be used.) 7 Track-mounted Sockets * P2RF-08-E 2 73 max. 31.5 M3 screws 48 max. 2 3 dia. (21) (22) 3.5 dia. hole 39.5 6 3 5 4 35.5 71.5 max. 2 Terminal 4 dia. Arrangement 9.5 (TOP VIEW) Terminal Arrangement (TOP VIEW) 1.5 85.5 max. 6 3 7 2 5 4 (11) (12) (24) (14) 35.5 Eight, M3.5 x 8 7 2 8 1 19.5 4 19.5 max. 30 max. 11.5 4 16 54 max. 84 min. (Including height of DIN track) * Secure the Sockets with M3 screws at a torque of 0.78 to 1.18 Nm. 8 (A1) (A2) 1 61 max. Note: Figures in parentheses indicate DIN standard numbers. * Secure the Sockets with M3 screws at a torque of 0.78 to 1.18 Nm. Liquid Leakage Point Sensor F03-16PS F03-16PS-F 8 10 BOTTOM VIEW 2 Electrode Overall length 2,000 mm Sheath: Fluoroplastic, 0.66 dia. 5.5 dia. 32 dia. 2.6-dia. vinyl-insulated round cable with 2 conductors Point Sensor Mounting Bracket F03-26PS Conductor cross section: 0.079 mm2 R5 10 19.2 1 24 8.85 1 3 R3 22.5 6 dia. 12 Glued surface * Use a commercially available bonding agent for PVC. Do not use adhesive tape for securing. Mounting Methods Stud Screw Mounting 1. Securing the Sensor with a Nut Special Bracket Mounting 2. Securing the Sensor with a Wing Nut * Use a commercially available bonding agent for PVC. 8 K7L-AT50/AT50D Liquid Leakage Sensor Amplifier K7L Q&A Some questions that are frequently asked about the K7L are given below. Use this information when selecting a model. Q Can one K7L Amplifier be used for detection in more than A one place? Yes. By using Terminal Blocks to connect Sensing Bands in parallel, detection can be performed in more than place with only one K7L Amplifier. Q A K7L-AT50 Possible wiring distance for wiring cable. Possible wiring distance for Sensing Band. 50 m max. 10 m max. Can a different terminal block (e.g. a commercially available terminal block or a terminal block constructed by the user) be used instead of the one provided? Yes. When using another terminal block, however, be sure to check that all the terminals are mutually isolated, and that there is no danger of ground faults in connecting cables or Sensing Bands. K7L-AT50 Note: For explosion-proof areas, use F03-20 Liquid Leakage Sensor, which has been certified for intrinsic safety and explosion-proof capability. Q A Terminal Blocks Note: 1. When wiring, be sure not to exceed the maximum possible wiring distances for both the connecting cable and the Sensing Band. Exceeding these distances may lead to faulty operation. Connect one Sensing Band to each Terminal Block. 2. Not applicable to K7L-AT50D. Impurities in the air K7L-U Impurities on the drain pan 400 m max. Terminal Blocks K7L-U Note: 1. When wiring, be sure not to exceed the maximum possible wiring distances for both the connecting cable and the Sensing Band. Exceeding these distances may lead to faulty operation. Connect one Sensing Band to each Terminal Block. 2. Not applicable to K7L-UD. Q A Can the K7L Amplifier detect pure water? Yes. Even pure water, which has a resistance exceeding 10 Mcm, can nearly always be detected if the K7L is used at its maximum sensitivity. This is because impurities are mixed with the water when it is leaked and the resistance drops. Q A Pure water Detection possible if sensing range 3 (0 to 50 M) is selected using the DIP switch. Can the K7L Amplifier detect oil? In most cases, no. If, however, it contains impurities such as metal powder, as is the case with cutting oil and used engine oil, detection may be possible (actual instances of detection have been observed). The user should confirm whether the required kind of detection is possible before application. Can the K7L Amplifier be used as a replacement for the 61F-GPN-V50 Water Leakage Detector? Yes. Because the surge withstand capability is different, however, do not use in locations where it will be exposed to impulses and surges, such as outdoor roofs or in pump panels. Also, items such as the power supply voltage and the connection sockets are different. Check these items before application. 9 Terms and Conditions Agreement Read and understand this catalog. Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you have any questions or comments. Warranties. (a) Exclusive Warranty. Omron's exclusive warranty is that the Products will be free from defects in materials and workmanship for a period of twelve months from the date of sale by Omron (or such other period expressed in writing by Omron). Omron disclaims all other warranties, express or implied. (b) Limitations. OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, ABOUT NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF THE PRODUCTS. BUYER ACKNOWLEDGES THAT IT ALONE HAS DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE. Omron further disclaims all warranties and responsibility of any type for claims or expenses based on infringement by the Products or otherwise of any intellectual property right. (c) Buyer Remedy. Omron's sole obligation hereunder shall be, at Omron's election, to (i) replace (in the form originally shipped with Buyer responsible for labor charges for removal or replacement thereof) the non-complying Product, (ii) repair the non-complying Product, or (iii) repay or credit Buyer an amount equal to the purchase price of the non-complying Product; provided that in no event shall Omron be responsible for warranty, repair, indemnity or any other claims or expenses regarding the Products unless Omron's analysis confirms that the Products were properly handled, stored, installed and maintained and not subject to contamination, abuse, misuse or inappropriate modification. Return of any Products by Buyer must be approved in writing by Omron before shipment. Omron Companies shall not be liable for the suitability or unsuitability or the results from the use of Products in combination with any electrical or electronic components, circuits, system assemblies or any other materials or substances or environments. Any advice, recommendations or information given orally or in writing, are not to be construed as an amendment or addition to the above warranty. See http://www.omron.com/global/ or contact your Omron representative for published information. Limitation on Liability; Etc. OMRON COMPANIES SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS, WHETHER SUCH CLAIM IS BASED IN CONTRACT, WARRANTY, NEGLIGENCE OR STRICT LIABILITY. Further, in no event shall liability of Omron Companies exceed the individual price of the Product on which liability is asserted. Suitability of Use. Omron Companies shall not be responsible for conformity with any standards, codes or regulations which apply to the combination of the Product in the Buyer's application or use of the Product. At Buyer's request, Omron will provide applicable third party certification documents identifying ratings and limitations of use which apply to the Product. This information by itself is not sufficient for a complete determination of the suitability of the Product in combination with the end product, machine, system, or other application or use. Buyer shall be solely responsible for determining appropriateness of the particular Product with respect to Buyer's application, product or system. Buyer shall take application responsibility in all cases. NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY OR IN LARGE QUANTITIES WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS, AND THAT THE OMRON PRODUCT(S) IS PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM. Programmable Products. Omron Companies shall not be responsible for the user's programming of a programmable Product, or any consequence thereof. Performance Data. Data presented in Omron Company websites, catalogs and other materials is provided as a guide for the user in determining suitability and does not constitute a warranty. It may represent the result of Omron's test conditions, and the user must correlate it to actual application requirements. Actual performance is subject to the Omron's Warranty and Limitations of Liability. Change in Specifications. Product specifications and accessories may be changed at any time based on improvements and other reasons. It is our practice to change part numbers when published ratings or features are changed, or when significant construction changes are made. However, some specifications of the Product may be changed without any notice. When in doubt, special part numbers may be assigned to fix or establish key specifications for your application. Please consult with your Omron's representative at any time to confirm actual specifications of purchased Product. Errors and Omissions. Information presented by Omron Companies has been checked and is believed to be accurate; however, no responsibility is assumed for clerical, typographical or proofreading errors or omissions. 2016.1 In the interest of product improvement, specifications are subject to change without notice. OMRON Corporation Industrial Automation Company http://www.ia.omron.com/ (c)Copyright OMRON Corporation 2016 All Right Reserved.