Omron K7L-AT50D, K7L-AT50 DATASHEET
Liquid Leakage Sensor Amplifiers
K7L-AT50/-AT50D
• Ultra-high sensitivity detects impedances of up to 50 M .
• Polyethylene makes the Sensing Band more resistant to chemicals.
• Series includes models with
disconnection detection.
*The color of the Sensing Band shown here is a conceptualization and is not necessarily the actual color.
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.
Ω
Fresh water, pure
water, distilled water,
plating liquids,
chemical liquids, IPA
(isopropyl alcohol)
AC Detection Method
Oscillator
Detector
Current
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
K7L-AT50
Connecting cable
cable, ensuring a high level of noise
immunity.
Multiple Installation
The power supply circuit and
the detection circuit are isolated, allowing several Amplifiers to be installed in the same
place.
■ Application Examples
Liquid Leakage Detection for
Measuring Baths in CMP Devices
Liquid leaked to drain pans can be detected to prevent damage to
devices and cleaning irregularities for wafers.
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.
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.
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.
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.
2 Liquid Leakage Sensor Amplifier K7L-AT50/-AT50D
Liquid Leakage Sensor Amplifier
K7L-AT50
Ultra-miniature Sensor Amplifier Reliably
Detects a Wide Variety of Liquids Ranging
from Water to Liquid Chemicals with Low
Conductivity.
• Detects liquids with impedance as high as 50 MΩ using interelectrode resistance detection. Detection of IPA and pure water
is possible.
• Four selectable sensing ranges ensure detection suited to the
characteristics of the liquid.
• Incorporates a noise canceller circuit connected to a 3-conductor cable, ensuring a high level of noise immunity and reliable
operation (patent pending).
• The power supply block and Sensing Band are isolated, allowing the installation of more than one device in the same place.
Ordering Information
Product name Model Characteristics
Liquid Leakage Sensor Amplifier K7L-AT50 ---
Sensors Sensing Band F03-16PE Standard model
F03-15 Greater durability and condensation resistance. (See note 1.)
F03-16PT Greater temperature and chemical resistance. (See note 1.)
F03-16SF Greater flexibility and superior workability. (See note 1.)
F03-16SFC Greater flexibility and enables visual confirmation when the inner color ap-
Point Sensor F03-16PS Easier to wipe off than the band type.
F03-16PS-F Electrodes have fluororplastic coating to resist chemicals.
Mounting Brackets
and Stickers
Terminal Blocks F03-20 ---
Track-mounted Socket P2RF-08-E ---
Note: 1. Compared with the standard model, F03-16PE.
2. One F03-20 Terminal Block is included as an accessory with the K7L-AT50.
3. The minimum order for the F03-25, F03-26PES, or F03-26PEN Sensing Band Stickers is one set (contains 30 Stickers).
4. The minimum order for F03-20 Terminal Blocks, F03-26PTN Sensing Band Stickers, or F03-26PS Point Sensor Mounting Brackets is one
set (contains 10 Terminal Blocks, Stickers, or Mounting Brackets).
Sensing Band Stickers
Point Sensor Mounting Brackets
F03-25 Used for F03-15 or F03-16SF(C).
F03-26PES Used for F03-16PE (adhesive tape).
F03-26PEN Used for F03-16PE (screws).
F03-26PTN Used for F03-16PT (screws).
F03-26PS Used for F03-16PS.
P2RF-08 ---
pears.
■ Available Sensing Band Lengths
1 m 2 m 5 m 10 m 15 m 20 m 25 m 30 m 40 m 50 m 60 m 70 m 75 m 80 m 90 m 100 m
F03-16PE OK OK OK OK OK OK OK OK
F03-15 OK OK OK OK OK OK OK OK OK OK
F03-16PT OK OK OK OK OK OK
F03-16SF(C) OK OK OK OK OK OK OK OK OK OK OK OK
Note: 1. To place an order for 1 m of the F03-16PE for example, specify F03-16PE-1M.
2. If you cannot find the length you need, please order the nearest larger length, then cut it to the required size.
Liquid Leakage Sensor Amplifier K7L-AT50 3
Specifications
■ Ratings
Rated power supply voltage 12 to 24 VDC (Allowable voltage fluctuation range: 10 to 30 VDC)
Operate resistance 0
Release resistance 105% min. of operate resistance
Output configuration NPN open-collector transistor output with 100 mA at 30 VDC max.
Wiring distance Connecting cable: 50 m max.
Accessories F03-20 Terminal Block (for connecting the connecting cable and Sensing Band)
Note: UL File No. E138234
CSA File No. LR95291-21
CE EMS: EN 61000-6-2
EMI: EN 55011
Ω to 50 MΩ, variable
Range 0: 0 to 250 k
Range 1: 0 to 600 kΩ
Range 2: 0 to 5 MΩ
Range 3: 0 to 50 MΩ
Note: The range is set using the DIP switch on the side of the Sensor Amplifier. (Refer to DIP Switch Set-
tings.) 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
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.
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 mm
Band specified by OMRON. (A 0.2-mm
Screwdriver for ADJUST setting.
(Purchase the Sensing Band, Sensing Band Stickers, connecting cable, and Socket separately.)
Ω
2
and a dielectric strength of 600 V is used together with a Liquid Sensing
2
cable can also be used.)
Ω.
■ Characteristics
Ambient temperature Operating: –10 to 55°C
Ambient humidity Operating: 45% to 85%
Insulation resistance 10 M
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.
Weight Approx. 14 g
Ω at 100 VDC between case and current-carrying parts
Release: 800 ms max.
4 Liquid Leakage Sensor Amplifier K7L-AT50
Nomenclature
t
Power indicator (green)
(Lit when power is supplied.
Output indicator (red)
(Lit when output
is ON.)
Resistance
value adjuster
■ DIP Switch Settings
Setting Sensing Range
DIP switch Range number Sensing range
Range 0 0 to 250 k
Range 1 0 to 600 kΩ
Range 2 0 to 5 MΩ
[
Range 3 0 to 50 MΩ
DIP switch Output mode
Ω
• Set the sensing range according to the impedance of the liquid to
be detected. (If the sensing range DIP switch pins are set in a way
not shown above, the actual range used will be the largest one by
default.) For the setting method, refer to the label on the side of the
Sensor Amplifier.
• It is possible to set the resistance value within the set sensing
range using the resistance value adjuster. At time of delivery, it is
set to the largest possible value and this setting can be used for
normal use.
• The resistance value adjuster is a precision component. Do not
apply a torque to the resistance value adjuster in excess of the
specified one. Doing so may cause the resistance value adjuster to
be damaged.
Applicable torque:
• Rotational torque: 9.81 m N·m max.
• Detent strength: 29.4 m N·m min.
Output OFF when liquid leakage
detected.
Output ON when liquid leakage
detected.
Operation
■ Countermeasures Against Noise
Noise Canceller Function for Highly
Sensitive Impedance Detection
The K7L Liquid Leakage Sensor Amplifier detects liquids with impedance as high as 50 M
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.
Ω and connects to the Sensing Band through a
Signal transmission
Sensing Band
line
Line 1
Line 2
Connecting cable
Connected with 3-conductor Cable that
Offsets Inductive Noise (Patent Pending)
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.
K7L signal transmission circuit
Subtraction circuit
Resistance measurement circui
Liquid Leakage Sensor Amplifier K7L-AT50 5
■ Connections
K7L-AT50
OUT+ Open-collector output
OUT- 100 mA at 30 VDC max.
Signal
transmission
Level input 1
Level input 2
12 to 24 VDC
Connecting cable
2
min.)
(0.2 mm
■ Connection Examples
NPN Output PNP Output
8
K7L
1
K7L
8
1
Load
5
6
F03-20 Terminal Block
Sensing Band
5
6
Load
6 Liquid Leakage Sensor Amplifier K7L-AT50
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