Operation
I Disconnection Detection Function
Operation During Monitoring for Liquid
Leakage
Operation During Monitoring for
Disconnection
• •Short-wave signals (2.5 VAC, 3.75 Hz) for liquid leakage detection
• Output of disconnection detection signals starts within 2 s of power
are output from terminal 4 of the K7L.
being supplied to the K7L and is repeated at 7-s intervals.
• •When there is no liquid leakage, the liquid leakage detection sig-
nals that are output are interrupted by the Terminator and the core
of the Sensing Band will be an open loop.
• Disconnection signals are DC signals of 10 V max. that are output
for approximately 200 ms. During this time, the K7L is in disconnec-
tion 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 disconnec-
tion.
2.5 VAC (3.75 Hz)
Signals interrupted by
Terminator.
Disconnection detection signals
are not interrupted by the Termi-
nator and return to the K7L.
K7L
10 VDC max., 200 ms
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 termi-
nal 2 through the leaked liquid.
K7L
• 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.
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 moni-
toring mode it will determine that a disconnection has occurred.
The output LED will flash, and the disconnection output will turn
ON.
Signals are interrupted where the
disconnection occurred.
K7L
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.
Liquid Leakage Sensor Amplifier with Disconnection Detection Function K7L-AT50D/-AT50D-S
E-33
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