Amphenol Advanced Sensors LET-Plus Alarm Module

Introduction

The Amphenol Advanced Sensors LET-Plus is an industrial leak detection alarm module designed to monitor areas where water or other conductive liquid leaks could cause equipment damage, downtime, or safety concerns. It combines long-range sensing cable support, configurable alarm functions, relay outputs, and RS485 MODBUS-RTU communications in a rugged enclosure.

Part Description

The LET-Plus is a multifunctional water leakage detection controller for fixed industrial monitoring installations. It can support up to 500 meters of compatible detection cable, allowing a single module to supervise large floor areas, cable routes, pipe runs, equipment perimeters, and containment zones.

In addition to detecting liquid contact along the sensing cable, the module can identify a cable disconnection or break condition. This provides improved fault awareness compared with simple leak alarms that only indicate the presence of moisture.

Key features include:

• Water leakage detection using connected sensing cable
• Support for cable runs up to 500 meters
• Detection of liquid leaks and sensing-cable disconnection
• Adjustable detection sensitivity
• Manual or automatic alarm reset options
• Relay outputs for local alarms, shutdown signals, or control-system interfaces
• MODBUS-RTU communication over an RS485 connection
• Wide power-input compatibility:
  • 12 VDC to 30 VDC
  • 12 VAC to 24 VAC
• IP65-rated fire-resistant ABS housing
• Suitability for industrial and facility leak-monitoring installations

Its RS485 MODBUS-RTU interface makes the LET-Plus suitable for integration with building management systems, supervisory control and data acquisition systems, programmable logic controllers, and remote monitoring networks.

Applications

Potential applications for the LET-Plus include:

• Data center raised-floor leak detection
• Server-room cooling-system monitoring
• HVAC condensate and chilled-water pipe monitoring
• Mechanical-room leak alarms
• Water pipe and valve-area monitoring
• Pump-room flood detection
• Chemical containment monitoring where compatible conductive fluids are present
• Battery-room spill detection
• Cleanroom utility-area monitoring
• Underfloor sensing in telecommunications facilities
• Leak detection around industrial machinery
• Laboratory water-line monitoring
• Warehouse and storage-area flood detection
• Building basement and utility-tunnel monitoring
• Marine or offshore equipment-space water ingress monitoring

Industries

The LET-Plus can be used in a range of industries, including:

• Data centers and cloud infrastructure
• Telecommunications
• Commercial building management
• Industrial automation
• Manufacturing
• Semiconductor production
• Pharmaceutical manufacturing
• Healthcare facilities
• Food and beverage processing
• Water and wastewater treatment
• Energy and utilities
• Oil and gas facilities
• Transportation infrastructure
• Marine and offshore operations
• Research laboratories

Usage Ideas

1. Data Center Floor Leak Network
   Install sensing cable beneath raised flooring near cooling units and water lines. Connect the LET-Plus relay output to an audible alarm and use MODBUS-RTU to report alarms to the facility monitoring system.

2. Pump Room Protection System
   Route detection cable around pumps, pipe joints, valves, and drainage areas. Configure the module to trigger a relay that activates a warning beacon or starts a backup drainage pump when a leak is detected.

3. Industrial Equipment Perimeter Monitor
   Place detection cable around a process machine or utility skid that uses cooling water. Use the module’s adjustable sensitivity and automatic reset function to monitor recurring small leaks and send status data to a PLC.

Conclusion

The Amphenol Advanced Sensors LET-Plus Alarm Module is a capable solution for industrial water leak detection across large monitored areas. With support for long sensing-cable runs, leak and cable-break detection, configurable reset behavior, relay outputs, and MODBUS-RTU connectivity, it can serve as both a local alarm controller and a connected monitoring device. Its IP65 fire-resistant enclosure and flexible AC or DC power input make it well suited to demanding facility, infrastructure, and industrial environments.