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ALM Water Sensor

The Adtran ALM Water Sensor is a reusable, passive water and humidity detection solution designed to help operators identify water intrusion in outdoor fiber enclosures before it impacts network performance. Integrated with the Adtran ALM fiber assurance platform, it provides continuous, real-time infrastructure protection for critical fiber assets across railway, utility, and telecom networks.

Water ingress, humidity, and flooding can gradually damage fiber splices, connectors, and optical components, increasing insertion loss and potentially causing unexpected network failures. The ALM Water Sensor provides operators with an early indication of these environmental threats, helping maintenance teams respond proactively and reduce the risk of costly service disruptions.

The sensor operates without batteries or a local power supply. When water enters a monitored splice box, the sensor introduces additional optical attenuation, which is detected by the centrally located ALM through an OTDR trace. The system then generates an alarm identifying the triggered sensor, while GIS integration enables the flooding event to be geographically located.

Designed for large distributed networks, multiple sensors can be cascaded across the infrastructure for centralized monitoring. The sensor is also reusable after water exposure, minimizing replacement requirements and helping operators achieve a cost-effective, low-maintenance approach to protecting outdoor fiber infrastructure.

How Water Detection Works?

Water enters enclosure → Sensor introduces additional attenuation → ALM detects attenuation change → Alarm identifies triggered sensor → GIS helps locate the affected site.

This allows multiple remote water sensors to be monitored centrally without requiring power or batteries at each location.

Applications

  1. Fiber Splice Box Monitoring: Detects water intrusion and humidity inside monitored fiber splice boxes before they lead to network degradation.
  2. Railway Fiber Networks: Protects outdoor fiber infrastructure supporting railway communication and signalling networks from water-related risks.
  3. Telecom Networks: Provides proactive water intrusion monitoring for outdoor telecom fiber infrastructure.
  4. Utility Networks: Enables centralized monitoring of distributed outdoor fiber assets used in utility communication networks.
  5. Outdoor Fiber Enclosures: Detects water, moisture, and flooding conditions that could affect splices, connectors, and optical components.
  6. Remote & Unstaffed Sites: Provides passive monitoring without requiring a local power supply or battery at the monitored location.
  7. Flood-Prone Fiber Infrastructure: Helps identify flooding events and geographically locate the affected site through GIS integration.
  8. Large Distributed Fiber Networks: Multiple sensors can be cascaded across large deployments for centralized infrastructure monitoring.

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ALM Water Sensor
Features Specifications FAQ Downloads



Features
  • Completely Passive Operation: Requires no power supply or battery at the monitored site, making it suitable for remote and difficult-to-access locations.
  • Early Water Intrusion Detection: Helps detect water-related fiber degradation before an impact on data transmission is observed, enabling proactive maintenance.
  • Fast Response: Provides a specified response time of ≤5 minutes, enabling operators to quickly identify water intrusion events.
  • Reusable Sensor: The sensor is not damaged by water and therefore does not need to be replaced after every water detection event.
  • Centralized ALM Monitoring: A centrally located ALM continuously monitors the status of water sensors using a single OTDR trace.
  • Precise Event Identification: When water triggers a sensor, ALM generates an alarm identifying which water sensor has been activated.
  • GIS-Based Event Localization: Integration with geographic information systems enables operators to precisely locate flooding events.
  • Multiple Sensor Deployment: Supports cascading multiple sensors across large fiber deployments, providing centralized visibility of distributed infrastructure.
  • Low Maintenance: Limited use of moving parts and passive operation result in little to no maintenance requirements.
  • Compact Design: With dimensions of just 5 × 36.0 × 6.5 mm, the sensor is designed for integration into compatible fiber splice boxes.
Specifications

Parameter

Specification

Recommended Fiber Type

ITU-T G.652

Minimum Bending Radius of Fiber

20 mm

Attenuation Increase at 100% RH

Typically, ~1 dB*

Drying Time from Full Flooding

8 hours

Response Time

≤ 5 minutes

Splice Box Compatibility

Corning C46197-A7-A70/A66 and similar

Dimensions (H × W × D)

46.5 mm × 36.0 mm × 6.5 mm

Product / Ordering Code

FAS/ALM/WTS – 1043709867-01

 *Attenuation increase depends on the fiber type.

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