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

Liquid Leakage Sensor Amplifier with
Disconnection Detection Function
K7L-AT50D/-AT50D-S

Detect Disconnections between the Sensor
Amplifier and a Terminator Connected to the End
of the Sensing Band.

• Constantly monitors for disconnections between the Sensor Ampli­fier and the Sensing Band.

• Failure to detect liquid leakage due to disconnection in the Sensing
Band prevented.

• Notification of disconnection detection made using LED indicator
and transistor output.

• After a disconnection is detected, the operating status is held to
avoid instability due to further contact of the disconnected part.

• This model retains all the characteristics of the K7L-AT50 (detection
sensitivity, sensing ranges, and AC detection method).

• Meets UL/CSA standards. (See information on standards on
page 7.)

Ordering Information

Name Model number

Liquid Leakage Sensor Amplifier with Disconnection Detection Function Set K7L-AT50D

Liquid Leakage Sensor Amplifier with Disconnection Detection Function Sensor Amplifier Only K7L-AT50D-S

Terminator (2P) F03-20T

Note: The Sockets, Terminal Blocks, Stickers, and Sensing Bands are the same as for the K7L-AT50.

Specifications

■ Ratings

Rated power supply
voltage

Operate resistance 0

Disconnection
detection function

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.

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

■ Characteristics

The characteristics are the same as for the K7L-AT50. Refer to page 4 for details.

12 to 24 VDC (Allowable voltage fluctuation range: 10 to 30 VDC)

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 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, use with the adjuster
set to the upper limit.) With any range, resistance values can be set from 0

Detection signal: 10 VDC max., 200 ms
Detection time: 10 s max.
Release: Released by resetting the power supply.

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/

disconnection is detected; if it is set to the up position, the output turns OFF when liquid/disconnection 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

tric strength of 600 V is used together with a Liquid Sensing Band specified by OMRON. (A 0.2-mm

Screwdriver for ADJUST setting.
F03-20T Terminator (provided with K7L-AT50D only)
(Purchase the Sensing Band, Sensing Band Stickers, connecting cable, and Socket separately. The Terminal Block is 3P; the Terminator is
2P.)

Ω

Ω.

2

cable can also be used.)

2

and a dielec-

Nomenclature

The nomenclature and DIP switch settings are the same as for the K7L-AT50. Refer to page 5 for details.

Liquid Leakage Sensor Amplifier with Disconnection Detection Function K7L-AT50D/-AT50D-S 7

Operation

■ Disconnection Detection Function

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.

2.5 VAC (3.75 Hz)

K7L

Signals interrupted by
Terminator.

Operation at Liquid Leakage Detection

• 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.

K7L

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.

Disconnection detection signals

10 VDC max., 200 ms

K7L

are not interrupted by the Ter mi­nator and return to the K7L.

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).

Signals are interrupted where the
disconnection occurred.

K7L

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.

■ Block Diagram for External Connections

Liquid leakage
detection output

Disconnection
detection output

Common

Open-collector output
100 mA at
30 VDC max.

OUT+

BURN OUT+

COM-

(Bottom view)

K7L-AT50D

Signal
transmission

Level input 1

Level input 2

12 to 24 VDC

Connecting cable

2

min.)

(0.2 mm

F03-20 Terminal Block

F03-20T Terminator

Sensing Band

8 Liquid Leakage Sensor Amplifier with Disconnection Detection Function K7L-AT50D/-AT50D-S

Sensing Band

F03-16PE

• SUS316 used for core and polyethylene used for sheath to en­sure high resistance to both acidic and alkaline liquids.

• Sensing Band Stickers that use the same material as the Sens­ing Band’s insulating resin are available in 2 types: adhesive­tape type and screw type.

Ordering Information

Name Model number Remarks

Liquid Leakage Sensing Band F03-16PE ---

Sensing Band Stickers F03-26PES

F03-26PEN

Specifications

Sheath Polyethylene

Core SUS316 stainless steel

Ambient operating temperature

Weight Approx. 16 g (1 m)

−15 to 55°C

30 Stickers per set
30 Stickers per set

Dimensions (Unit: mm)

■ Sensing Band

Appearance

Structure

Materials: Electrodes: SUS316 stainless steel,
Sheath: Polyethylene

20

■ Sensing Band Stickers

F03-26PEN (screws) F03-26PES (adhesive tape)

Appearance

Structure

Note: The shape of the adhesive tape shown above is for securing the F03-16PE.

32

13

22

3.5 dia.**

4

Cut section

1.2

1.7

8

3.0

Material: Polyethylene

19.2

13

Adhesive tape
(See note.)

Material: Polyethylene

5

Sensing Band F03-16PE 9

Sensing Band

F03-16PT

• Compared to the F03-16PE (polyethylene), the F03-16PT has
higher resistance to both high temperatures and chemicals.

• Small holes enable the detection of leakage even when in­stalled upside down.

Ordering Information

Name Model number Remarks

Fluoroplastic Sensing Band F03-16PT ---

Fluoroplastic Sensing Band Stickers F03-26PTN 10 Stickers per set

Specifications

Sheath PTFE fluoroplastic

Core SUS316 stainless steel

Ambient operating temperature –50 to 200

Weight Approx. 16 g (1 m)

°C

Dimensions (Unit: mm)

■ Sensing Band

Appearance

Structure

10

Materials: Electrodes: SUS316 stainless steel,
Sheath: Fluoroplastic

■ Sensing Band Stickers

F03-26PTN (screws)

Appearance

Structure

12

15

Two, 3.5 dia.

1.7

1.2

2.75

Material: Fluoroplastic PTA

25

19/0.12 × 0.6t
SUS316

3.0

Note: The shape of the adhesive tape shown above is for securing the F03-16PE.

10 Sensing Band F03-16PT

Sensing Band

)

F03-15

• Ideal for harsh electrical room environments that are dusty and
humid.

• For installation in locations requiring insulated materials.

Ordering Information

Name Model number Remarks

Liquid Leakage Sensing Band F03-15 ---

Sensing Band Stickers F03-25 30 Stickers per bag

Specifications

Sheath Flexible, transparent vinyl chloride

Core SUS304 stainless steel

Ambient operating temperature

Weight Approx. 48 g (1 m)

−15 to 50°C

Dimensions (Unit: mm)

■ Sensing Band

Appearance

Structure

8

■ Sensing Band Stickers

Appearance

Structure

(3)

25±2

Electrode pairs

25

Flexible, transparent
vinyl chloride

333 (3 pairs/m)

F03-25

15±1

(Stainless steel wire

0.3 mm x 12-wire braided cable

(5)

Adhesive tape

Material: SUS304

(0.5)

(1)

Sensing Band F03-15 11

Sensing Band

F03-16SF

• Greater flexibility and superior workability compared with the
F03-16PE.

• The sheath becomes transparent to reveal the red inner sheath
if liquid leakage occurs, thereby enabling visual confirmation.
After drying, the Sensing Band color will return to white
(F03-16SFC only).

Ordering Information

Name Model number Remarks

Sensing Band F03-16SF Without color indication

F03-16SFC With color indication

Stickers F03-25 30 Stickers per bag

Specifications

Sheath Special plastic fiber braided cable with water-absorbent and water-repellent characteristics

Core Tin-plated, copper stranded wire

Ambient operating temperature

Fire retardancy Not fire retardant

Weight Approx. 20 g (1 m)

−15 to 60°C

Length of Cable

■ Length of Cable (For reference only. Performance values may differ.)

(1) Connection with K7L-AT50 or K7L-AT50D (IV Cable + Sensing Band)

Sensing Band 0 m 10 m 50 m 100 m 150 m

Wiring Cable Note

0 m ❍❍❍❍❍

Range 3 Range 3 Range 2 Range 2 Range 1

10 m ❍❍❍❍❍

Range 3 Range 3 Range 2 Range 2 Range 1

50 m ❍❍❍❍❍

Range 3 Range 3 Range 2 Range 2 Range 1

100 m ❍❍❍❍❍

Range 3 Range 3 Range 2 Range 2 Range 1

150 m ❍❍❍❍❍

Range 3 Range 3 Range 2 Range 2 Range 1

200 m ❍❍❍❍❍

Range 3 Range 3 Range 2 Range 2 Range 1

❍···Set value that can be used.

2

Note: These values are possible provided that a completely insulated 3-conductor VCT cable with a thickness of 0.75mm

of 600 V is used.

and a dielectric strength

12 Sensing Band F03-16SF

(2) Connection with 61F-GPN-V50 or 61F-WLA (IV Cable + Sensing Band)

g

Sensing Band 0 m 10 m 50 m 100 m 150 m 200 m

Wiring Cable Note

0 m ❍❍❍❍❍❍

10 m ❍❍❍❍❍

50 m ❍❍❍❍❍

100 m ❍❍❍

150 m ❍

❍···Can be used.

Note: These values are possible provided that a completely insulated 3-conductor VCT cable with a thickness of 0.75mm

2

and a dielectric strength

of 600 V is used.

Dimensions (Unit: mm)

F03-16SF F03-16SFC

Appearance

Electrode Internal braiding Exter nal braidin

Structure

Appearance

Structure

(4.5)

External braiding (white)

Internal braiding (white)

Electrode

(4.5)

External braiding (white)

Internal braiding (red)

Electrode

F03-25

25±2

(3)

(5)

15±2

Adhesive tape*

Material: SUS304

(0.5)

(1)

Sensing Band F03-16SF 13

Chemical Resistivity for F03-16PE/-16PT

Material Sheath Core Material Sheath Core

Polyethylene Fluoroplastic SUS316 Polyethylene Fluoroplastic SUS316

Water A A A Toluene C B B

Acetone C A A Phenol B B A

Ammonia AAAButanolB A ---

Ethanol BAAFluorineA A C

Hydrochloric acid AACHexaneCA ---

Hydrogen peroxide solution A A A Benzene C A A

Xylene B A A Methanol B A A

Cyclohexane C A --- Sulfuric acid C A B

Trichloroethylene C A A Phosphoric acid A B B

Note: 1. A: Not affected at all or only very slightly affected.

B: Slightly affected but, depending on the conditions, sufficient for use.
C: Affected but may still be used. (Replace the Sensing Band immediately after detection.)

2. In order to prevent secondary fire damage, consider the effect of the atmosphere of the environment and the solution to be detected on
the Sensing Band.

3. If the Sensing Band changes shape or color when a liquid is detected, replace the Sensing Band.

■ Connecting the Sensing Band

Bending the Sensing Band

To change the direction of the Sensing Band, bend the Sensing Band
in one or two places where the core is not exposed.

Bent in 1 place

Note: Bend the Sensing Band approximately 4 cm (i.e., twice the dis-

tance between places where the core is exposed) away from
places where a Sticker is attached. If the Sensing Band is bent
at places further away than this, the Sensing Band may come
away from the surface.

Bent in 2 places

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. (Refer to
Dimensions on page 9.) More Sensing Bands can be connected
simply by wiring in an arch shape.

4 to 6 cm

9 mm

Exposed
part of
core

Note: Check that the wiring is secure before using the K7L in applica-

tions.

Insert

F03-20
Terminal
Block

Interval Between Stickers

When securing the Sensing Band with Stickers, attach the Stickers
at intervals of 20 to 30 cm in places where the core is not exposed.

20 to 30 cm

Note: 1. When using the F03-26PES (adhesive-tape model), be sure

to wipe all moisture, oil, and dust from the surface to which
the Sticker is to be attached. Failure to do so may result in
insufficient adhesion, and the Sticker may peel away from
the surface.

2. When using the F03-26PEN (screw model), before install­ing the Sensing Band, it is necessary to perform stud weld­ing. For details on the pitch of the studs, refer to the
information on the dimensions of Sensing Band Stickers.

Sensing
Band
Sticker

14 Sensing Band F03-16PE/-16PT/-15/-16SF

Liquid Leakage Sensing Band Precautions

Refer to the following installation methods and install the Sensing Band securely using the proper method for the location and environment.

1. Post or Beam Mounting
Use fasteners, such as concrete anchors, to secure the Sensing Band every 500 to 1,000 mm to ensure that it does not come loose. If the sur­face of the post or beam is very uneven, apply two-sided tape to the mounting surface first and then secure the Sensing Band to the tape with
the fastener.

2. Conduit Installation
For vertical conduits, wrap the Sensing Band around the conduit at a pitch 2 to 3 times the diameter of the conduit. For horizontal conduits,
secure the Sensing Band at appropriate intervals along the bottom of the conduit using an insulated adhesive strap, such as Insulock, to
ensure that the Sensing Band does not come loose.

3. Dike and Catch Basin installation
Use the specified stickers (sold separately) to secure the Sensing Band at appropriate intervals to keep it flat in the dike or catch basin.

4. Floor Installation
Estimate the leakage detection area and use stickers to secure the Sensing Band at appropriate intervals on the floor and around equipment.
Cover the Sensing Band with plastic or metal molding to protect it from contact with other objects and from being stepped on by workers.
Leave a 50- to 100-mm gap in the molding at approximately 500-mm intervals where it touches the floor to allow liquids to pass through.

5. Do not install the Sensing Band in locations where condensation is likely to occur.

6. Mount the Sensing Band as close as possible to the mounting surface. Make sure that any gaps are no more than 2 mm in horizontal installa-

tions, such as the floor, and no more than 1 mm with vertical installations, such as posts and beams.

7. Attach an insulated protector, such as plastic molding, securely to the Sensing Band to protect it from contact with power cables carrying over
300 V.

8. Normally leaking materials detected by the Sensing Band will evaporate and the Sensing Band will return to its original state. The Sensing
Band may not return to its original state and will have to be replaced, however, if the leaking material contained conductive impurities. Follow
the appropriate replacement procedures.

9. The Sensing Band is not designed to be used as electrical wiring and must not be used for any purpose other than leak detection.

10.Do not apply petroleum-based products, such as wax, to the Sensing Band. Otherwise, liquids may be repelled and detection may fail.

Sensing Band F03-16PE/-16PT/-15/-16SF 15

FAQs

Some questions that are frequently asked about the K7L are given below. Use this information when selecting a model.

Can one K7L Amplifier be used for detection
in more than 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.

Possible wiring distance
for wiring cable.

50 m max.

K7L-AT50

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.

Possible wiring distance for
Sensing Band.

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.

Can the K7L Amplifier detect pure water?

Yes.

Even pure water, which has a resistance exceeding 10 MΩ⋅cm, 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.

Pure water

Impurities in
the air

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.

Impurities on
the drain pan

Detection possible if sens
ing range 3 (0 to 50 MΩ)
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.

16 Liquid Leakage Sensor Amplifier K7L-AT50/-AT50D

Liquid Leakage Point Sensor

F03-16PS

A New Liquid Leakage Point Sensor Has Been Added
to the K7L Series. Fluoroplastic Coating on the
Bottom Electrode Ensures Chemical Resistance.

• Can be used in conjunction with Sensing Bands.

• Stud screw mounting requires no tools for installation.

• No tools means the Sensor can be wiped clean quickly and easily.

• The optional Mounting Bracket enables faster installation than three-screw

mounting.

• Connect multiple Sensors to one K7L-AT50 Amplifier for significant cost

savings.

Ordering Information

Sensors

Product name Main material Cable material Electrode material Model

Liquid Leakage Point Sensor Polyethylene Outer sheath: PVC

Mounting Brackets (See note 1.) --- --- F03-26PS

Terminal Block (See note 2.) Nylon 6.6 --- --- F03-20

Note: 1. Use a commercially available bonding agent for PVC. One bag contains 10 Brackets.

2. One bag contains 10 Blocks.

Inner sheath: Fluoroplastic

Amplifier

Product name Model

Liquid Leakage Sensor Amplifier K7L-AT50

SUS304 F03-16PS

SUS304 and fluoroplastic coating F03-16PS-F

Specifications Wiring Diagram

Ambient temperature −10 to 60°C

Nut tightening torque 0.3 N·m max.

Weight Approx. 30 g

Max. No. connected per
Amplifier

Any number up to an overall cable length of 60 m.

Any number of Sensors can be connected in parallel up to an overall
cable length of 60 m. Leakage areas cannot be specified with the
K7L-AT50.

5

4

6

3

7

2

8

1

K7L-AT50
Liquid Leakage
Sensor Amplifier

Overall cable length: 60 m max. (Sensing Bands: 10 m max.)

4

4

3

3

2

2

4

4

3

3

2

2

4

4

3

3

2

2

F03-20
Terminal Block

Mounting Methods

Stud Screw Mounting

Securing the Sensor with a Nut Securing the Sensor with a Wing Nut

Special Bracket Mounting

F03-16PS
Liquid Leakage Point Sensor

F03-16PS
Liquid Leakage Point Sensor

Sensing Band

Note: Use a commercially available bonding agent for PVC.

(See note.)

Liquid Leakage Point Sensor F03-16PS 17

Dimensions (Unit: mm)

Liquid Leakage Sensor Amplifier

K7L-AT50/-AT50D

PW

K7L-AT50D

L

IQ

U

ID

L

E

S

E

N

S

O

R

OUT

ADJUST

12.8

A

K

A

G

E

K7L-AT50D

28.8

46

Track-mounted Sockets (See note 2.)

P2RF-08 (Round terminals can be used.)

71.5 max.

31.5

4

7

19.5 max.

Eight,
M3.5 × 8

73 max.

30 max.

54 max.

19.5

2

4 dia.

Terminal

Arrangement

9.5
(Top view)

35.5

Liquid Leakage Point Sensor

F03-16PS
F03-16PS-F

Terminal Block (See note 1.)

F03-20

29.1

33

23.1

23

4

3.2

234

3.2

5.8

5 × 3=15

25

234

17.5

5.8

2.5

17

3.5

Terminator (See note 1.)

F03-20

24.1

33

3.2

28.1

2-4

(4-2)

Mounting Hole Dimensions

25

3.2

Two, M3

18±0.2

Track-mounted Sockets (See note 2.)

P2RF-08-E

Terminal Arrangement

1.5

2

M3 screws

3

6

4

5

2
178

85.5
max.

4

3.5 dia. hole

16

(Including height of DIN track)

48 max.

61 max.

84 min.

2

3 dia.

35.5

11.5

(Top view)

6

7

39.5

5

(24) (14)

8

(A1)

(A2)

Figures in parentheses
indicate DIN standard
numbers.

(11)(21)

3

(12)(22)

2

4

1

10

32 dia.

5.5 dia.

8

2

Overall length

2,000 mm

Sheath: Fluoroplastic, 0.66 dia.

2.6-dia. vinyl-insulated round cable with
2 conductors,

Conductor cross section:

2

0.079 mm

Electrode

Note: 1. The Terminal Block is made of nylon 66. Mount the Terminal Block in locations not subject to liquid chemicals using M3 screws.

2. Secure the Sockets with M3 screws at a torque of 0.78 to 1.18 N

⋅m.

18 Liquid Leakage Sensor Amplifier K7L-AT50/-AT50D, F03-16PS

Point Sensor Mounting Bracket

F03-26PS

R5

1

6 dia.

Safety Precautions

■ Precautions for Safe Use

Observe the following points to ensure safe operation.

• Be sure to use a power supply voltage within the specified range.
Not doing so may result in burning or malfunction.

• Do not use the product in locations subject to flammable gases or
combustible objects. Doing so may result in fire.

• Insert the connection points into Sockets until the connection is
locked securely. Not doing so may result in burning or malfunction.

• Do not short-circuit loads connected to output terminals. Doing so
may result in burning.

• Be sure to connect the power supply with the correct polarity. Not
doing so may result in malfunction.

10

24

R3

1

1222.5

19.2

38.85

■ 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.

• Applications under conditions or environments not specified in user
documentation

• Applications for nuclear control systems, railroad systems, aviation
systems, vehicles, combustion systems, medical equipment,
amusement machines, or safety equipment

• Applications that may have a serious influence on lives and prop­erty and thus require particularly attention to safety

■ Precautions for Correct Use

Installation

Attach to a panel of thickness 1 to 5 mm.

Do not install in the following locations.

• Locations subject to shock or vibration

• Locations where the temperature or humidity lies outside the speci-

fied range, or where condensation is likely to occur (To detect liq­uids with high impedances, do not use in locations with high
humidity.)

• Locations subject to dust

• Locations subject to corrosive gases (particularly sulfide and

ammonia gases)

• Outdoors or locations subject to direct sunlight

• Near devices that generate strong high-frequency noise (e.g., high-

frequency welding devices etc.)

Liquid Leakage Sensor Amplifier K7L-AT50/-AT50D, F03-16PS 19

Warranty and Application Considerations

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.

Warranty and Limitations of Liability

WARRANTY

OMRON's exclusive warranty is that the products are free from defects in materials and workmanship for a period of one year (or other
period if specified) from date of sale by OMRON.

OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, REGARDING NON-INFRINGEMENT,
MERCHANTABILITY, OR FITNESS FOR PARTICULAR PURPOSE OF THE PRODUCTS. ANY BUYER OR USER ACKNOWLEDGES
THAT THE BUYER OR USER ALONE HAS DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS
OF THEIR INTENDED USE. OMRON DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED.

LIMITATIONS OF LIABILITY

OMRON SHALL NOT BE RESPONSIBLE FOR SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS, OR
COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS, WHETHER SUCH CLAIM IS BASED ON CONTRACT,
WARRANTY, NEGLIGENCE, OR STRICT LIABILITY.

In no event shall the responsibility of OMRON for any act exceed the individual price of the product on which liability is asserted.
IN NO EVENT SHALL OMRON BE RESPONSIBLE FOR WARRANTY, REPAIR, OR OTHER CLAIMS 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 OR REPAIR.

Application Considerations

SUITABILITY FOR USE

OMRON shall not be responsible for conformity with any standards, codes, or regulations that apply to the combination of products in
the customer's application or use of the products.

Take all necessary steps to determine the suitability of the product for the systems, machines, and equipment with which it will be used.
Know and observe all prohibitions of use applicable to this product.
NEVER USE THE PRODUCTS FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY WITHOUT ENSURING

THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS, AND THAT THE OMRON PRODUCTS ARE
PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM.

Disclaimers

PERFORMANCE DATA

Performance data given in this catalog 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 users must correlate it to actual application requirements. Actual
performance is subject to the OMRON Warranty and Limitations of Liability.

CHANGE IN SPECIFICATIONS

Product specifications and accessories may be changed at any time based on improvements and other reasons. Consult with your
OMRON representative at any time to confirm actual specifications of purchased product.

DIMENSIONS AND WEIGHTS

Dimensions and weights are nominal and are not to be used for manufacturing purposes, even when tolerances are shown.

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. F049-E1-07

OMRON Corporation

Industrial Automation Company

Control Devices Division H.Q.
Industrial Components Department

Shiokoji Horikawa, Shimogyo-ku,
Kyoto, 600-8530 Japan
Tel: [phone]/Fax: [phone]

In the interest of product improvement, specifications are subject to change without notice.

Regional Headquarters

OMRON EUROPE B.V.

Wegalaan 67-69, NL-2132 JD Hoofddorp
The Netherlands
Tel: [phone]/Fax: [phone]

OMRON ELECTRONICS LLC

1 East Commerce Drive, Schaumburg, IL 60173
U.S.A.
Tel: [phone]/Fax: [phone]

OMRON ASIA PACIFIC PTE. LTD.

83 Clemenceau Avenue,
#11-01, UE Square,
239920 Singapore
Tel: [phone]/Fax: [phone]

OMRON (CHINA) CO., LTD.

Room 2211, Bank of China Tower,
200 Yin Cheng Road (M)
Shanghai, 200120 China
Tel: [phone]/Fax: [phone]

Printed in Japan
0605-0.3M (0305) (B)