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The SD-RO1 is a single zone spot detector with one relay output.  It can be used in conjunction with any product that accepts a digital dry contact input.

Spot detectors are ideal for small spaces, and are the most economical way to detect fluids in confined areas, such as condensation drip pans.


Note: The SD-RO1 requires an isolated 24 volt power supply. RLE recommends and stocks the WA-AC-24-ST. The PSWA-DC-24 may also be used, but if a DC power supply is used the SD-RO1 will be a latching device – once an alarm is detected, the spot detector will remain in an alarm state until power is cycled to the SD-RO1. Power supplies are available for purchase separately.


Technical Specifications

Key Features

  • No exposed metal sensing posts – nothing to rust or corrode
  • Potted electronics
  • Functions when submerged in water
  • Adjustable probes are easily adjusted to desired height
  • Can be screwed or ram set to floor or baseboard
  • Small footprint/enclosure
  • Simple installation
  • Ideal for tight areas

Power: 24VAC/VDC ± 10%, 0.1A max.; requires power supply: PSWA-DC-24 or WA-AC-24-ST (not included)


Relay Output: Dry Contact, Form C; 1A @ 24VDC, 0.5A resistive @ 120VAC


Leader Cable (Non-sensing)

  • Length: 14 feet (4.27m)
  • Connector: N/A

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: 1.55″W x 2.0″H x 1.0″D (39.4mmW x 50.8mmH x 25.4mmD)


Weight: 7 oz. (192g)


Certifications: CE; ETL listed: conforms to UL 61010-1, EN 61010, CSA C22.2 No. 61010-1, IEC 61326:1997; RoHS compliant