ANWETECH AT-LD102 is a locating leakage controller used as the main control unit for leak detection cable systems. It is designed to monitor compatible leak sensing cables and provide leakage location indication, local alarm, relay output, and RS485 Modbus RTU communication.
Unlike a single-purpose water leakage alarm, AT-LD102 can serve as the controller host for different types of leakage detection cable systems. When matched with suitable sensing cables, it can be applied to water leak detection, oil leak detection, fuel leak detection, liquid hydrocarbon leak detection, and chemical liquid leak detection applications.
When liquid leakage is detected, the controller activates sound and light alarm indication, displays the leakage location on the LED digital display, outputs relay alarm signal, and transmits leakage data through the RS485 communication interface.
The controller can be used independently as a local leakage alarm unit or integrated into a monitoring system, BMS, PLC, remote alarm panel, or industrial monitoring platform through Modbus RTU communication.
AT-LD102 is not limited to one leakage application. It can be used as the controller host for compatible leak detection cables for water, oil, fuel, liquid hydrocarbon, and chemical liquid leak monitoring.
When leakage occurs, the controller displays the leakage position on the LED digital display, helping users quickly identify the approximate leakage point and reduce inspection time.
AT-LD102 can monitor leak sensing cable with a total length of up to 1000 meters, making it suitable for long-distance cable routing in equipment rooms, trenches, tank areas, pipeline zones, warehouses, and industrial facilities.
The controller supports RS485 two-wire communication and Modbus RTU protocol, allowing connection to BMS, PLC, SCADA, remote monitoring panels, or other integrated acquisition hosts.
AT-LD102 provides relay alarm output for leakage events. The relay supports NO and NC contact states, allowing connection to local alarm devices, remote alarm systems, shut-off valves, PLC input modules, or other control devices.
The controller provides local sound and light alarm indication when leakage is detected, making it suitable for independent use in small systems or local monitoring panels.
The controller supports standard 35 mm DIN rail installation, making it easy to install inside control cabinets, monitoring boxes, electrical panels, or instrument enclosures.
With relay output and RS485 Modbus RTU communication, AT-LD102 can be used in both standalone leak detection systems and integrated monitoring projects.
The following accessories can be used according to the selected leakage detection application:
Compatibility depends on the selected sensing cable type and project liquid medium.
| Item | Specification |
|---|---|
| Model | AT-LD102 |
| Product Type | Locating leakage controller / leak detection cable controller host |
| Supported Detection Type | Depends on compatible sensing cable: water, oil, fuel, liquid hydrocarbon, or chemical liquid leakage |
| Supply Voltage | 12–24 VDC |
| Alarm Mode | Relay, sound and light alarm, RS485 Modbus RTU |
| Relay Contacts | NO and NC optional |
| Relay Carrying Capacity | 2A @ 30VDC / 1A @ 125VAC |
| Serial Interface | RS485 two-wire network |
| Communication Protocol | Modbus RTU |
| Baud Rate | Default 9600; configurable |
| Address Range | 0–255, default address 1 |
| Maximum Monitoring Length | Up to 1000 m |
| Working Environment | -30 to 60°C, 10 to 80% RH, no condensation |
| Storage Environment | -20 to 50°C, 10 to 80% RH, no condensation |
| Shell Material | ABS + PC |
| Installation Method | 35 mm DIN rail |
| Dimensions | Approx. 70 mm W × 86 mm H × 58 mm D |
| Item | Data |
|---|---|
| Maximum Sensing Cable Length | Up to 1000 m |
| Leakage Location Indication | LED digital display |
| Communication Output | RS485 Modbus RTU |
| Local Alarm | Sound and light alarm |
| Relay Output | NO / NC selectable |
| Status Indication | Power, service / disconnection, leak alarm |
| Applicable Sensing Cable Type | Selected according to liquid type and site requirement |
AT-LD102 connects to the leak detection sensing cable through the detection line interface. The sensing cable wiring sequence shown in the source file is:
| Terminal / Wire | Color |
|---|---|
| 1 | Black |
| 2 | Yellow |
| 3 | Green |
| 4 | Red |
Power input is 12–24 VDC.
The relay output can be used to send leakage alarm signals to external equipment. It can be connected to local alarm devices, remote monitoring systems, PLC input modules, valve control circuits, or building management systems.
| Contact Point | Output State | Alarm Situation |
|---|---|---|
| N.O.–COM | Disconnect | No leakage alarm |
| N.O.–COM | Closure | Leakage alarm |
| N.C.–COM | Disconnect | Leakage alarm |
| N.C.–COM | Closure | No leakage alarm |
The RS485 interface supports Modbus RTU communication. The default address is 1 and the default baud rate is 9600. Address and baud rate can be configured according to the upper monitoring system.
AT-LD102 is designed for 35 mm DIN rail installation. It can be installed inside a control cabinet, leakage monitoring panel, electrical enclosure, or instrument box.
Installation notes:
