Liquid Leakage Sensor Amplifier with Disconnection Detection Function
K7L-AT50D/-AT50D-S
7
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 Ampli-
fier 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
Ordering Information
Note:
The Sockets, Terminal Blocks, Stickers, and Sensing Bands are the same as for the K7L-AT50.
Specifications
■
Ratings
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.
Nomenclature
The nomenclature and DIP switch settings are the same as for the K7L-AT50. Refer to page 5 for details.
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
Rated power supply
voltage
12 to 24 VDC (Allowable voltage fluctuation range: 10 to 30 VDC)
Operate resistance
0
Ω
to 50 M
Ω
, variable
Range 0:
0 to 250 k
Ω
Range 1:
0 to 600 k
Ω
Range 2:
0 to 5 M
Ω
Range 3:
0 to 50 M
Ω
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
Ω
.
Disconnection
detection function
Detection signal: 10 VDC max., 200 ms
Detection time: 10 s max.
Release: Released by resetting the power supply.
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.
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.
Wiring distance
Connecting cable: 50 m max.
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
2
and a dielec-
tric strength of 600 V is used together with a Liquid Sensing Band specified by OMRON. (A 0.2-mm
2
cable can also be used.)
Accessories
F03-20 Terminal Block (for connecting the connecting cable and Sensing Band)
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.)