Liquid leak detection · Spot detectors vs sensing cable, controller and alarm outputs, response time, cable length, wired or wireless, power, operating environment and certifications
A leak sensor detects liquid where it should not be — under raised floors, in drip pans, along pipe runs, beside tanks and equipment — and signals a controller or monitoring system before damage spreads. Settle three things before asking for quotes: spot detection or continuous sensing cable for the area to cover, how alarms reach people and systems (relays, network, wireless), and the power, environment and certifications for the site.
Spot leak detectors, water-leak sensing cable and the zone, distance-read and wireless controllers that monitor them, for data centres, plant rooms, process areas and buildings. Gas leak detectors, pipeline leak detection by flow or pressure analysis, and moisture sensors for materials are outside this page.
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RLE Technologies describes spot detectors as the lowest-cost way to detect fluid in confined areas such as condensation drip pans. Its SD-Z spot detector has no exposed metal sensing posts, potted electronics, adjustable probes, works when submerged in water, and draws power from the panel. In a distance-read system it simulates 50 ft of cable, and it needs a leader cable and end-of-line terminator to connect. [1]
Sensing cable covers longer runs: RLE's LD310 zone controller accepts up to 300 ft (91 m) of SeaHawk sensing cable, or SD-Z and SD-Z1 spot detectors, on one input with a 15 ft leader cable and end-of-line terminator. [2]
Editorial calculation: 300 ft of cable laid around the perimeter of a 25 × 15 m room (80 m) leaves about 11 m for leader runs and loops; larger or subdivided areas need more controller inputs or a distance-read controller. [2] [1]
Give the supplier the liquid (water, chilled water, coolant, chemicals), area and layout to cover, spot or cable format, cable length per zone, whether leak location along the cable is needed, controller type and number of zones, alarm outputs (relays, BMS protocol, network), wired or wireless, power supply, operating environment and required certifications, and quantity.
02
The LD310 detects a leak on sensing cable in under 20 s, drives two Form C alarm relays for leak and fault rated 1 A at 24 V DC or 0.5 A resistive at 120 V AC, sounds an 85 dB alarm at 10 cm with a bi-colour LED, signals cable breaks, runs on an isolated 5 V DC supply at 100 mA maximum, and operates from 0 to 50 °C at 5–95% RH non-condensing. [2]
For wireless monitoring, RLE's WiNG-LD transmitter accepts up to 100 ft of sensing cable or an SD-Z or SD-Z1 detector, transmits every 10–20 s at 868 or 900 MHz with up to 600 ft line-of-sight range, responds in under 20 s, detects cable breaks, and runs on a 3.6 V AA lithium battery for up to 5 years across its full −25 to 85 °C range or up to 12 years at room temperature. [3]
The SD-Z works from 0 to 50 °C, is stored from −20 to 70 °C, measures 39.4 × 50.8 × 25.4 mm, weighs 93 g and is ETL listed to UL 61010-1 with CE marking. [1]
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The manufacturer card below states what the reviewed source shows.
Ask each supplier for detection method, response time, maximum cable length per zone, alarm outputs and protocols, power, environment and certification data. [2] [3] [1] Aqara lists a water leak sensor among its smart home sensors. [4]
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This is a functional reference built from the sources cited; it is not a full specification.
| Part | What it controls | Fix in the order |
|---|---|---|
| Spot detector or sensing cable | Coverage; sensitivity. [1] [2] | Format; length. |
| Leader cable and EOL terminator | Connection; supervision. [1] [2] | Lengths. |
| Controller | Response; zones; alarms. [2] | Zone or distance-read. |
| Alarm relays and indicators | Notification. [2] | Form C; dB. |
| Wireless transmitter | Range; battery. [3] | MHz; years. |
05
A leak sensor quotation needs values for your design. The table explains each field, gives published values where a reviewed source states them, and says what to obtain from the supplier.
| Field | What it means and published values | Ask the supplier for |
|---|---|---|
| Detection Method | Spot probes or sensing cable. [1] [2] | Method; liquids. |
| Supply Voltage | 5 V DC isolated (LD310); 3.6 V battery (WiNG-LD). [2] [3] | V DC. |
| Current Consumption | 100 mA max (LD310). [2] | mA. |
| Output Type | 2 Form C relays; 868/900 MHz wireless. [2] [3] | Relays; protocol. |
| Contact Rating | 1 A at 24 V DC; 0.5 A at 120 V AC. [2] | A. |
| Response Time | Under 20 s. [2] [3] | s. |
| Operating Temperature | 0–50 °C (SD-Z, LD310); −25–85 °C (WiNG-LD). [1] [2] [3] | °C. |
| Storage Temperature | −20–70 °C (SD-Z). [1] | °C. |
| Ingress Protection | Works submerged (SD-Z). [1] | IP code. |
| Probe Material | No exposed metal posts (SD-Z). [1] | Material. |
| Housing Material | Potted electronics (SD-Z). [1] | Material. |
| Cable Length | Up to 300 ft per LD310 input; 100 ft per WiNG-LD. [2] [3] | m. |
| Weight | 93 g (SD-Z). [1] | g. |
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Paste it into your enquiry below or into an email to a maker, then replace every bracket.
Liquid: [water; coolant; chemical] Area: [layout; m to cover] Format: [spot; cable] Controller: [zones; distance-read] Alarms: [relays; BMS protocol; wireless] Power: [V DC; battery] Environment/certs: [°C; RH; UL; CE] Quantity: [detectors; m of cable]
The manufacturer below lists a water leak sensor on its own website. Confirm detection method, outputs and certifications for your order.
Lists a water leak sensor in its smart home sensor range.
Product scope checked 2026-10-11
Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.
RLE recommends spot detectors for confined areas such as drip pans; sensing cable covers runs of up to 300 ft per LD310 controller input. [1] [2]
RLE's LD310 controller and WiNG-LD transmitter both list a response time under 20 seconds. [2] [3]
RLE's WiNG-LD sends leak alarms at 868 or 900 MHz up to 600 ft line of sight on a battery lasting up to 12 years at room temperature. [3]
The LD310 has two Form C relays (leak and fault) rated 1 A at 24 V DC, plus an 85 dB sounder. [2]
Sources checked 2026-10-11. RLE Technologies' SD-Z spot detector, LD310 zone controller and WiNG-LD wireless transmitter pages are used to show what a leak sensor specification covers; values for your order must come from the supplier's datasheet.
Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.
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