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The SeaHawk LD310 single zone leak detection controller monitors up to 300 feet (91 meters) of sensing cable.  It is compatible with all of RLE’s leak detection sensing cables, as well as SD-Z and SD-Z1 spot detectors.


When your system is in alarm, the LD310 will notify you via:

  • Audible alarm
  • Visible LED
  • Leak and fault relay outputs

Ideal for smaller areas and facilities, the LD310 can act as a stand-alone controller or integrate into existing monitoring systems.  The LD310 is most commonly installed in facilities with pumps, chillers, boilers, water control valves, and around air conditioner condensation pans.


Note: A 5VDC power supply is required to power the LD310. RLE recommends and stocks theWA-DC-5-ST, a medical grade 5VDC isolated power supply that is prepared with stripped ends that wire directly into the LD310. This supply is available for purchase separately.


Technical Specifications

Key Features

  • Accommodates:
    • up to 300 feet (91 meters) of conductive fluid sensing cable and/or spot detectors, or
    • up to 210 feet (64 meters) of chemical sensing cable
  • Visible alarm indicator
  • Two Form C output relays for leak and fault alarms
  • Audible and visible alarm notification
  • Adjustable leak alarm sensitivity thresholds
  • Configurable for supervised or non-supervised operation
  • Distinguishes normal conditions from alarm conditions
  • Quickly returns to normal

Included Equipment: LD310 controller, leader cable, end-of-line (EOL) terminator


Additional Requirements: Power supply WA-DC-5-ST, sensing cable and spot detector (as needed for application)


Power: Isolated 5VDC (±10%) @ 100mA max; requires power supply WA-DC-5-ST (available from RLE, sold separately)



  • Leak Detection Cable: Compatible with all SeaHawk sensing cables as well as SD-Z and SD-Z1 spot detectors (not included)
  • One Cable Input: Requires 15ft (4.6m) leader cable and EOL terminator (included)
  • Maximum Sensing Cable Length: 300ft (91m) of conductive fluid sensing cable, or 210ft (64m) of chemical sensing cable
  • Detection Response Time:  When used with conductive fluid or chemical sensing cables, less than 20sec; 10sec typical.

Outputs: 2 Form C Alarm Relays (leak and fault); 1A @ 24VDC, 0.5A resistive @ 120VAC; configurable as supervised or non-supervised


Alarm Notification

  • Audible Alarm: 85dB @ 10cm (min)
  • Visual Alarm: Bi-color LED

Front Panel Interface

  • Audible Alarm: Indicates cable break or leak detected
  • LED Indicator:
    • Normal Operation: Green
    • Cable Fault: Flashing orange
    • Leak Detected: Flashing red

Operating Environment

  • Temperature: 32° to 122°F (0° to 50°C)
  • Humidity: 5% to 95% RH, non-condensing
  • Altitude: 15,000ft (4,572m) max.

Storage Environment: -4° to 158°F (-20° to 70°C)


Dimensions: 2.7″W x 4.4″H x 1.38″D (69mmW x 112mmH x 35mmD)


Mounting: Surface mount


Certifications: CE; ETL listed: conforms to UL 61010-1, EN 61010-1; RoHS compliant