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Water Leak Detectors

Spot Detector for Single-Point Water Leak Detection

Spot detectors offer a cost-effective solution for monitoring isolated areas where fluid leaks are likely to occur. Designed for detecting water and other conductive liquids, these sensors provide reliable single-point leak detection.

Ideal for use in drain pans, mechanical rooms, floor drains, fire pump rooms, riser rooms, and other confined spaces, spot detectors quickly identify leaks at the source—helping prevent damage in high-risk areas.

RLE’s line of Spot Detectors (SD series) can communicate with Zone Controllers or Distance-Read panels for integrated monitoring. Select models also feature built-in relay outputs, allowing direct connection to Building Management Systems (BMS) or other third-party monitoring platforms.

Compact, responsive, and easy to deploy—Spot Detectors are the smart choice for pinpoint leak detection in targeted applications.

Water Leak Sensors

SD-R01

Water Leak Detection with Relay Output

SD-R01

The SD-R01 was the first Spot Detector with a relay output for detecting water leaks. Using a Form C relay output allows integration back to most alarm systems. There is a Normally Open and Normally Closed contact for third-party system monitoring systems. From BAS, BMS, Remote Annunciator Panels, Security Panels, and other Alarm systems, this water leak sensor has you covered.

SD-R01 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 the desired height
Can be screwed or ram set to floor or baseboard
Small footprint/enclosure
Simple installation
Ideal for tight areas

SD-R01 Specifications

Power: Requires an isolated power supply.

24VDC (±10%) Isolated @ 0.1A max.; requires RLE power supply PSWA-DC-24-ST (not included)
- 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.
24VAC (±10%) Isolated @ 0.1A max.; requires RLE power supply 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)

Supporting Documents

SD-R02

Water Leak Sensor with Two Relay Outputs

SD-R02

SD-R02 is a Spot Detector with two relay outputs for detecting water leaks. Using a Double Pole Double Throw (DPDT) Form C relay output allows integration back to most alarm systems. The two relay outputs are isolated so that you can connect the Leak Sensor to two independent systems. Both outputs have a Normally Open and Normally Closed contact for third-party system monitoring systems. From BAS, BMS, Remote Annunciator Panels, Security Panels, and other Alarm systems, this water leak sensor has you covered. If you need to connect to two different monitoring systems, save money with one leak sensor that does both.

SD-R02 Key Features

Two relay outputs for quick integration into a BMS or DCiM
LEDs and audible alarms provide immediate local notification when a leak is detected
No exposed metal sensing posts – nothing to rust or corrode
Potted electronics
Functions when in water
Adjustable probes are easily adjusted to the desired height
Can be screwed or ram set to floor or baseboard
Small footprint/enclosure
Simple installation
Ideal for tight areas

SD-RO2 Specifications

Power: Requires an isolated power supply.

24VDC (±10%) Isolated @ 0.15A max.; requires RLE power supply PSWA-DC-24-ST (not included)
- When a DC power supply is used the SD-RO2 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-RO2.
24VAC (±10%) Isolated @ 0.15A max.; requires RLE power supply WA-AC-24-ST (not included)

Relay Outputs: Two relay outputs; Dry Contact, Form C; 1A @ 24VDC, 0.5A resistive @ 120VAC

Alarm Notification

Audible Alarm: 85dbA
Visible Alarm: Power LED: Power Applied – Green; Alarm LED: Leak Detected – Red

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 1.1″D (39.4mmW x 50.8mmH x 27.9mmD)

Weight: 8 oz. (219g)

Supporting Documents

SD-Z1

Water Leak Sensor with Zone Controllers

SD-Z1

SD-Z1 was designed for sending a supervised leak signal back to a Zone Controller. The four-wire design allows for water leaks and cable breaks to be detected. The SD-Z1 can be connected to any RLE SeaHawk Zone-style control panel. Depending on the design of your zone leak controller, users can set sensitivity levels to determine when a water leak is present.

SD-Z1 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 the desired height
Can be screwed or ram set to floor or baseboard
Small footprint/enclosure
Simple installation
Ideal for tight areas

SD-Z1 Specifications

Power: N/A (powered by panel)

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: 5 oz. (136g)

Supporting Documents

SD-Z

In-Line Spot Detector for Water Leaks

SD-Z

SD-Z was designed for sending a supervised leak signal back to a Distance-Read Controller. The four-wire design allows for water leaks and cable breaks to be detected. The SD-Z can be connected in-line to Sense Cable or other SD-Z sensors. This water leak sensor simulates a distance from the input to the output. For Distance-Read Controllers, this allows to map and determine the location of the leak sensor. The SD-Z detects water leaks and other conductive-based fluids.

SD-Z 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 the desired height
Can be screwed or ram set to floor or baseboard
Small footprint/enclosure
Simple installation
Ideal for tight areas

SD-Z Specifications

Power: N/A (powered by panel)

Leader Cable (Non-sensing)

Length: 10 inches (0.25m); male & female connector
Connector: 1 male, 1 female; 4 pin, 0.96in (24.4mm) diameter; connects to SeaHawk sensing cable (SC) cable or non-sensing cable (NSC)

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: 3 oz. (93g)

Supporting Documents

Water Leak Spot Detector for Legacy Hardware

The SD Spot Detector was initially designed to integrate into the Falcon FMS unit. This water leak detector has a small form factor and can fit in the smallest spaces. This two-wired sensor is a tremendously cost-effective solution. This detector is compatible with a Falcon FMS, RASP6, RASP12, or RA1x2 from RLE Technologies.

SD 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 the desired height
Can be screwed or ram set to floor or baseboard
Small footprint/enclosure
Simple installation
Ideal for tight areas

SD Specifications

Power: The SD is usually powered by the RLE FMS. In the event that it is not used in conjunction with an FMS, it does require an isolated power supply.

24VDC (±10%) Isolated @ 0.1A max.; requires RLE power supply PSWA-DC-24-ST (not included)
- If a DC power supply is used the SD 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.
24VAC (±10%) Isolated @ 0.1A max.; requires RLE power supply WA-AC-24-ST (not included)

Solid State Output: 12-36VAC @ 0.01A min., 0.1A max.; 18-36VDC @ 0.01A min., 0.1A max.

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: 4 oz. (105g)

Supporting Documents

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