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Liquid Leakage Sensor Amplifiers

K7L-AT50 / -AT50D

K7L-AT50 / -AT50D

Ultra-miniature Sensor Amplifier Reliably Detects a Wide Variety of Liquids Ranging from Water to Liquid Chemicals with Low Conductivity.

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Ratings

Rated power supply voltage12 to 24 VDC (Allowable voltage fluctuation range: 10 to 30 VDC)
Operate
resistance		0 Ω to 50 MΩ, variable
Range 0: 0 to 250 kΩ
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 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 mm2 and a dielectric strength of 600 V is used together with a Liquid Sensing Band specified by OMRON. (A 0.2-mm2 cable can also be used.)
AccessoriesF03-20 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.)

Note:
UL File No. E138234
CSA File No. LR95291-21

Characteristics

Ambient temperatureOperating: -10 to 55°C
Ambient humidityOperating: 45% to 85%
Insulation resistance10 MΩ at 100 VDC between case and current-carrying parts
Dielectric strength1,000 VAC at 50/60 Hz for 1 min between case and current-carrying parts
Power consumption1 W max.
Response timeOperate: 800 ms max.
Release: 800 ms max.
WeightApprox. 14 g

Caution: In the interenst of product improvement, specifications are subject to change without notice.

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