RLE LD1500

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RLE LD1500


The SeaHawk LD1500 distance-read leak detection controller monitors up to 1500 feet (457 meters) of sensing cable.  This web-accessible controller is designed for simple integration into existing monitoring systems, and is compatible with all SeaHawk sensing cables and the SeaHawk SD-Z spot detector.


This controller is ideal for areas where sensing cable may not be visible.  The LD1500 is most commonly installed in data centers (under raised floors), museums, libraries, clean rooms, and telecommunication centers.  Multiple LD1500s can connect to RLE Technologies’ LD2100 and LD5200, allowing the LD2100 or LD5200 to identify and annunciate multiple, simultaneous leaks.


Note: The LD1500 requires an isolated 24 volt power supply. RLE recommends and stocks PSWA-DC-24, a 24VDC supply that plugs directly into a wall outlet. This supply is available for purchase separately.


Technical Specifications

Key Features

  • Monitors:
    • up to 1,500 feet (457 meters) of conductive fluid sensing cable and/or spot detectors, or
    • up to 1,050 feet (320 meters) of chemical sensing cable
  • Web-based interface – view alarms and configuration with a Web browser
  • Adjustable leak, delay, & alarm sensitivity threshold
  • Modbus integration with LD5200 & LD2100
  • SNMP, Modbus, and BACnet communications
  • Supervised system identifies cable breaks and contamination

Included Equipment: LD1500 controller, Cat5 crossover cable, leader cable, end-of-line (EOL) terminator


Additional Requirements: Power supply PSWA-DC-24, sensing cable and spot detector (as needed for application)


Power: 24VDC@ 600mA max., 50/60Hz; requires power supply: PSWA-DC-24 (not included) 24VAC Isolated@ 600mA max., 50/60Hz; requires power supply: WA-AC-24-ST (not included) 100/120/230-240VAC@ 500mA max., 50/60Hz power supply; included in the LD-ENC optional enclosure



  • Leak Detection Cable: Compatible with SeaHawk sensing cable (not included)
  • Cable Input: Requires 15ft (4.6m) leader cable and EOL terminator (included)
  • Maximum Length: 1,500ft (457m) of conductive fluid sensing cable, or 1,050ft (320m) of chemical sensing cable or hydrocarbon sensing cable
  • Minimum Length: 35ft (11 m)
  • Detection Accuracy: ± 2ft (0.6m) +/- 0.5% of the cable length
  • Detection Repeatability: ± 2ft (0.6m) +/- 0.25% of the cable length
  • Detection Response Time: When used with conductive fluid sensing cable or chemical sensing cable, 5-995sec, software adjustable in 5 second increments; ±2sec.

Communication Ports

  • Ethernet: 10/100BASE-T, RJ45 connector; 500VAC RMS isolation
  • EIA-232: DB9 female connector; 9600 baud; 8 data bits, no parity, 1 stop bit
  • EIA-485: 1200, 2400, 9600, 19200, or 38400 baud (selectable); Parity: none, even or odd, 8 data bits, 1 stop bit


  • TCP/IP, HTML, TFTP: IPv4.0; webpages comply with Rehabilitation Act of 1973, sections 504 and 508, US Dept of Education (website accessibility for computer users with disabilities)
  • SNMP: V1: V2C MIB-2 compliant; NMS Manageable with Get, Set, Traps
  • Modbus (EIA-485): Slave; RTU mode; Supports function codes 03, 04, 06 and 16 Master: RTU mode for integration with RLE’s LD5200, LD2100 and LD1500 products; Johnson N2
  • Modbus TCP/IP UDP/IP: Modbus Slave; TCP/IP transmission protocol Modbus Master; TCP/IP transmission protocol for integration with RLE’s LD2100 and LD1500 products
  • BACnet/IP: ASHRAE STD 135-2004 Annex J
  • BACnet MS/TP: EIA-485
  • BACnet Alarms: Automatically reports to a single destination
  • Terminal Emulation (EIA-232): VT100 compatible

Alarm Notification

  • Visual Alarm: Bi-color status LED
  • SNMP Traps/Informs (Ethernet): 2 Community Strings

Logging Capabilities

  • Event Log: Last 10 events

Login Security

  • Web Browser Access (Ethernet): 1 Web password Read Only; 1 Web password Read/Write
  • Terminal Emulation Access: None

Front Panel Interface

  • LED Indicators: Power/Status: 1 bi-color (Power On: green; Alarm / Cable Fault / Cable Contamination: 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 185°F (-20° to 85°C)


Dimensions: 7″W x 3.62″H x 1.25″D (178mmW x 92mmH x 32mmD)


Weight: 1.5 lbs. (680g)


Mounting: Panel mount Type 1 enclosure.  Optional wall mount enclosure available (LD-ENC-NP)


Certifications: CE; ETL listed: conforms to UL 61010-1, EN 61010-1; certified to CSA C22.2 NO. 61010-1; RoHS compliant