Product Description
AT-LD201 leak detection alarm module is designed to provide early warning of water or other conductive liquid leaks along a length of sensing cable. It continuously monitors the cable and detects both actual leaks and cable open-circuit faults. When a leak occurs, the red “Leak” LED turns on, the buzzer sounds and the relay output changes state so that external alarms or control devices can be activated.
The module uses a 2-wire RS-485 interface with MODBUS-RTU protocol, allowing the leak and fault status to be reported to a monitoring host, BMS, PLC or fire alarm system. Sensitivity can be adjusted on the front panel to suit different application environments and to reduce false alarms. AT-LD201 is built with an industrial-grade design, low power consumption and compact flame-retardant ABS housing for DIN35 rail mounting inside standard cabinets.
Key Features
Non-locating leak detection alarm module for conductive sensing cable
Monitors sensing cable length up to 500 m
Industrial-grade design with high stability and reduced false alarms
Detects cable break (open circuit) and reports as fault alarm
On-site audible alarm with front-panel mute button (press 3 s)
Three LED indicators: Leak (red), Service/Fault (yellow), Power (green)
SPDT relay output (NO/NC, common COM) for external alarms or controls
RS-485 communication with MODBUS-RTU protocol (9600 bps, 8-N-1)
Wide 12–28 VDC power input, typical power consumption < 0.3 W
Continuously adjustable sensitivity (0–10 kΩ) and minimum alarm time 1 s
DIN35 rail mounting, compact white flame-retardant ABS enclosure
Technical Specifications
Sensing
Type: Non-locating conductive leak sensing
Max. sensing cable length: 500 m
Sensitivity adjustment: 0–10 kΩ, continuously adjustable
Minimum alarm time: 1 s
Communication
Interface: RS-485, 2-wire
Protocol: MODBUS-RTU
Serial settings: 9600 bps, 8 data bits, no parity, 1 stop bit (8-N-1)
Device address range: 1–254 (factory default 1)
Relay Output
Contact type: SPDT (NO / NC / COM)
Contact rating: 125 VAC / 500 mA; 24 VDC / 2 A
Power
Supply voltage: 24 VDC nominal (12–28 VDC range)
Power consumption: < 0.3 W
Environmental
Operating temperature: −20 °C to +50 °C
Operating humidity: 0–95% RH, non-condensing
Mechanical
Dimensions (L × W × H): 70 × 86 × 58 mm
Housing material: White, flame-retardant ABS
Mounting: DIN35 rail
Note: Module is not waterproof; install inside a suitable enclosure or cabinet.
