Liquid Leakage Sensor Amplifiers K7L Series Reliable Sensitive Liquid Sensors for Stable Detection of Liquid Chemicals with Low Conductivity and Water Leakage A lineup of new models compatible with Push-In Plus Terminal Block Sockets is available. UL listed when used with Push-In Plus Terminal Block Sockets. Sensor disconnection detection (K7L-AT50D /- K7L-AT50 K7L-U K7L- B UD ). Models for long-distance wiring to 400 m. Ribbon Electrode Bands and Point Sensors For the most recent information on models that have been available. certified for safety standards, refer to your OMRON website. Model Number Legend K7L- (1) (2) (3) (1) (2) (3) Output Symbol Meaning Symbol Meaning Symbol Meaning PNP connection NPN connection (Equivalent) Standard wiring For Screw Terminal AT50 Blank No sensor disconnection detection OK OK Blank distance Block Socket Long wiring For Push-In Plus U D Sensor disconnection detection OK NG B distance Terminal Block Socket Sensor disconnection detection DP NG OK Supports plus common connection Disconnection Wiring distance Socket terminals (*1) Standards Model detection Screw Terminal Block K7L-AT50 P2RF-08/-08-E Not supported. Push-In Plus Terminal Block K7L-AT50B (*2) P2RF-08-PU K7L-AT50D Standard usage Screw Terminal Block Wiring cable: 50 m max. P2RF-08/-08-E Sensing Bands: 10 m max. K7L-AT50DP Supported. K7L-AT50DB (*2) Push-In Plus Terminal Block P2RF-08-PU K7L-AT50DPB (*2) Screw Terminal Block K7L-U P2RF-08/-08-E Not supported. Push-In Plus Terminal Block K7L-UB (*2) P2RF-08-PU K7L-UD Long distance use Screw Terminal Block Total Length of Wiring Cable and P2RF-08/-08-E Sensing Bands: 400 m max. K7L-UDP Supported. K7L-UDB (*2) Push-In Plus Terminal Block P2RF-08-PU K7L-UDPB (*2) *1. The applicable models of the K7L depend on the model of the Socket. If the correct Socket is not used, the K7L nameplate will be upside down. *2. The UL listing applies only when the Sensor is used in combination with a Push-In Socket (P2RF-08-PU). By itself, the K7L is UL recognized. 1Liquid Leakage Sensor Amplifier/Liquid Leakage Sensor Amplifier with Disconnection Detection Function K7L-AT50 /AT50D Reliable Detection of a Wide Variety of Liquids Ranging from Water to Liquid Chemicals with Low Conductivity. Four Sensing Ranges Available. A lineup of new models compatible with Push-In Plus Terminal Block Sockets is available. Series of plus common connection compatible *1. The UL listing applies only when the Sensor is used in combination with a Push-In Plus Terminal Block Socket products added. (P2RF-08-PU). UL listed when used with Push-In Plus Terminal Block By itself, the K7L is UL recognized. Sockets. *1 *2. For the K7L-AT50D. *3. UL/CSA UL 508 Provides stable detection of liquids with impedance as CAN/CSA C22.2 No.14 high as 50 M using inter-electrode resistance detection. CE: EMI EN 55011 Detection of IPA and pure water possible. EMS EN 61000-6-2 EAC Higher noise immunity with a noise canceller circuit RCM connected to a 3-conductor cable. KOSHA (S Mark) certified 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 el iminate instability due to contact of the disconnected part. *2 Meets a variety of safety standards. *3 Refer to Safety Precautions on page 10. 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 The K7L incorporates a noise canceller circuit that uses a 3-conductor water. Four sensing ranges are available, ensuring detection suited to the cable, ensuring a high level of noise immunity. application. 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. Oscillator Detector Current 2
