User Manual

K7L-AT50@/AT50D@@
5
Nomenclature and DIP Switch Settings
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 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.
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-AT50
LIQUID LEAKAGE
SENSOR
PW
OUT ADJUST
Power indicator (green)
(Lit when power is supplied.)
Output indicator (red)
(Lit when output is ON.)
Resistance adjuster
Power indicator (green)
(Lit when power is supplied.)
Output indicator (red)
(Lit when output is ON.)
Resistance
adjuster
OMRON Corporation
SENSOR RANGE
SENSOR
RANGE
MODE
MODE(OUTPUT)
NC
NO
K7L-AT50/AT50D/AT50DP
K7L-AT50B/AT50DB/AT50DPB
Setting Sensing Range
* Disconnection detection is supported only by the K7L-AT50D/
AT50DB/AT50DP/AT50DPB.
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
Sensing
Band
Subtraction circuit
Resistance
measurement
circuit
Signal transmission
circuit
Signal transmission line
4
2
3
Line 1
Line 2
Connecting cable
K7L