User Manual

2
Liquid 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 Sockets is available.
• Series of plus common connection compatible
products added.
• UL listed when used with Push-In Plus Terminal
Sockets. *1
• 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. * 2
• Series includes an Explosion-proof Barrier (Sold Separately) to enable usage in hazard atmospheres.
• CE Marking and UL/CSA certification. *3
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
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.
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.
Noise Canceller Function (Patent Pending)
The K7L incorporates a noise canceller circuit that uses a 3-conductor
cable, ensuring a high level of noise immunity.
*1. The UL listing applies only when the Sensor is used in
combination with a Push-In Plus Terminal Socket
(P2RF-08-PU).
By itself, the K7L is UL recognized.
*2. For the K7L-AT50D.
*3. UL/CSA UL 508
CAN/CSA C22.2 No.14
CE: EMI EN 55011
EMS EN 61000-6-2
Refer to Safety Precautions on page 10.
Fresh water, pure water, distilled water,
plating liquids, chemical liquids,
IPA (isopropyl alcohol)
Detector
Current
Oscillator
Connecting cable