WLD Relay 1W-UNI water sensor for leak monitoring
€196.90
Early warning of water leakage: universal WLD sensor with relay and 1W-UNI output
The HW group Sensor WLD Relay 1W-UNI is an external water leak detection sensor with 2D water detection for connecting a WLD sensing cable (Water Leak Detection) of type A or B. It has one input for a WLD zone and two types of outputs: a relay output (NO/NC) and an RJ11 output (1W-UNI). The zone can be up to 185 m long. The sensing cable reports even a few drops of water, ethylene glycol or other conductive liquid at any point along the entire cable length. This makes it suitable for sensitive environments such as server rooms, data centers, industrial plants, archives or museums, where water leaks can cause significant damage.
The sensor can be used as a standalone WLD sensor (power supply plus relay output). It indicates a flooded state or a disconnected cable. Alternatively, it works as a 1W-UNI sensor on any device of the STE2 family, Poseidon2, Ares, Perseus or other HWg devices. Early detection and warning help avoid damage and the associated costs, even at locations without Ethernet connection. The WLD Relay is part of the HWg Monitoring Ecosystem (sensors, devices and SensDesk Technology portal) with alarms, graphs, PDF reports, open API and remote management.
One zone, two outputs, many applications
The WLD Relay 1W-UNI detects the state of the sensor zone and reports it either via relay or via the 1-Wire UNI bus.
1x WLD zone up to 185 m
One input for WLD sensing cable type A or B. The zone may consist of sensing and extension cable together up to 185 m long.
Relay output (NO/NC)
Signals water or a disconnected sensing cable via a relay contact (50 V / 1000 mA). An external 12 V supply is required for this.
1W-UNI output (RJ11)
Connection via RJ11 cable to any HWg device (e.g. STE2, Poseidon2, Ares, Perseus) as a normal external sensor.
Detection of disconnected cables
In addition to a water leak, the device also detects an interrupted, disconnected or damaged sensing cable, which increases operational safety, and reports this as a separate state.
Own monitoring system
According to the manufacturer, the sensor can also be connected to a proprietary monitoring system.
Easy installation
Simple mounting; clips are provided for fastening the sensing cable.
Three states
OK (no leak, cable intact), Flooded (liquid detected) and Cable disconnected (sensing cable interrupted or damaged).
Prevent damage early
Even a few drops trigger an alarm to prevent damage such as short circuits or device failures.
Individually selectable: Set 1 or Set 2
The Sensor WLD Relay 1W-UNI is available in two variants.
Please note: The variants are selected in the dropdown above the add-to-cart button. Only Set 2 includes additional accessories (sensing cable, connection cable, J-clips and power supply); Set 1 is the pure device without sensing cable. The WLD sensing cable type A must then be ordered separately.
Set 1
Pure device (plain unit) of the external WLD sensor. Input: 1x WLD zone for sensing cable (max. 185 m). Two outputs: RJ11 1W-UNI or relay (NO/NC) with external 12 V supply. The device is supplied without sensing cable.
Set 2
Retail package (starter set) with 1x Sensor WLD Relay 1W-UNI, 2+2 m WLD sensing cable type A (2 m sensing cable and 2 m WLD-A connection cable), 2x J-clip and power adapter. The relay output is available (12 V required); alternatively the device can be used as an RJ11 1W-UNI sensor and powered via that connection.
How the Sensor WLD Relay 1W-UNI is built
The compact housing measures 79 x 68 x 34 mm (W x H x D), weighs 122 g and complies with IP33 protection class. It is designed for mounting on a desk or on the wall.
Housing and mounting
Compact plastic housing (IP33) for indoor use, suitable for industrial and IT environments. Mounting is possible on horizontal or vertical surfaces, e.g. on a desk, on the wall, on the floor or under raised floors.
WLD input (sensor zone)
One input for a zone with WLD sensing cable type A/B. The cable is connected via the WLD connection cable AB (2 m, green terminal block, terminator). Measurement is based on the resistance principle; the sensor provides one value.
RJ11 output (1W-UNI)
Via the RJ11 connectors (1-Wire bus, two sockets) the sensor is connected to an HWg device. The device automatically detects the sensor via its unique sensor ID. The status is transmitted as a numerical value: 0 = OK, 1 = sensing cable flooded, 2 = sensing cable disconnected. In 1W-UNI operation, supply is via the RJ11 connector (5 V / 40 mA).
Relay output (NO/NC)
The relay output (max. 50 V / 1000 mA) indicates the state: open = OK (or “device off”), closed = sensing cable flooded or disconnected. It enables direct control of alarm systems, sirens, lamps, pumps, valves or other devices and can be connected to any digital input (DI) of a device.
Power supply
For relay operation, an external supply of 9–15 V DC (approx. 20 mA, recommended 12 V) is required, optionally via barrel jack (inner 2.1 mm, outer 5.5 mm) or terminal block. In 1W-UNI operation, the RJ11 connector supplies the device.
WLD sensing cable and extension
The sensing cable can be extended with a two-core non-sensing cable (total zone length max. 185 m) and divided into several segments to monitor only critical points.
How the sensor reports the zone state
Depending on the operating mode, the state is output via the RJ11 bus or via the relay contact.
Status 0: OK
Via the RJ11 bus (1W-UNI) the value 0 is reported. At the relay output the contact remains open (also when the device is switched off).
Status 1: Sensing cable flooded
Via the RJ11 bus the value 1 is reported. At the relay output the contact closes.
Status 2: Sensing cable disconnected
Via the RJ11 bus the value 2 is reported. At the relay output the contact closes.
The WLD sensing cable: durable, robust and reusable
The WLD sensing cable A/B detects water along its entire length. It is supplied in lengths from 2 m to 50 m and can be extended with a non-sensing WLD extension cable.
No twist limit
The sensing cable type A/B can be twisted like any other electrical cable.
No bend limit
There is no minimum bend radius. The cable can even be knotted and will still function correctly.
No pressure limit
Detection is not impaired by point pressure within reasonable limits.
Reusable
The cable can be cleaned, dried and reinstalled.
Fabric sheath
The fabric sheath promotes the absorption of liquids and thus rapid detection.
Flexible fastening
The cable can be attached with clips, adhesive tape or other fastening methods to floors, walls or pipes, e.g. under raised floors.
For HWg devices and proprietary systems
As a 1W-UNI sensor, the WLD Relay works with HWg devices with RJ11 connector. For multiple WLD zones, several sensors can be operated on one Poseidon or Ares device.
STE2 family
For example STE2 R2 as a device with RJ11 sensor connectors.
Poseidon2
Multiple sensors on one device enable water detection in several zones.
Ares
For example Ares 12 LTE; here too, multiple zones with multiple sensors are possible.
Perseus
For example Perseus Monitoring 150 as well as other HWg devices with RJ11 connector.
Damocles
Devices of the Damocles family with 1-Wire UNI support.
SiteMon
Compatible if the device supports 1-Wire UNI.
Part of the HW group monitoring ecosystem
The following functions are available in combination with compatible HWg devices.
Alarming
E-mail, SNMP trap for network monitoring systems, SMS or call via an external SMS gateway (e.g. HWg-SMS-GW3) as well as alarms via the SensDesk portal.
SensDesk portal
Long-term monitoring, data logging, reports, graphs and remote management via HWg-Cloud or SensDesk.
Box-2-Box mode
Communication with other HW group devices for controlling relay outputs (e.g. Poseidon2 or Damocles2).
Open interfaces
Support for SNMP, HTTPS, XML and an open API for third-party software (C++, PHP, Java and others).
HWg-PDMS
Software for data logging with export to MS Excel.
HWg-Trigger
Software for advanced alarming logic, e.g. SMS via an external GSM modem.
Matching accessories from the HW group range
The manufacturer lists the following components for the WLD system. They are available separately if they are not included in the selected variant.
- WLD sensing cable A: 2 m / 10 m / 50 m
- WLD sensing cable B: 2 m / 5 m / 10 m / 50 m
- WLD connection cable AB: 2 m, green terminal block, terminator
- WLD extension cable AB: 5 m, non-sensing, total extendable up to 100 m
- WLD Poro Tape 5 m: Adhesive tape with holes for fastening the sensing cable
- WLD Cover Strip A-35 5 m: Cover strip for WLD sensing cable A
- Power-Jack cable 1 m: Converter from barrel jack to 2 wires
- 12 V plug-in power supply INT: 12 V / 0.5 A with three interchangeable plugs (EU, UK, US)
- UPS 12V: Backup power source for devices with 12 V DC supply
Commissioning in a few steps
The sensor can be put into operation in two ways: as a standalone sensor with relay output or as a 1W-UNI sensor on an HWg device.
- Mount the sensor on a desk or on the wall
- Connect the WLD sensing cable type A/B via the connection cable AB to the WLD input and lay and fasten it along the point to be monitored (with Set 2 using the included J-clips, alternatively with adhesive tape or other fastening methods)
- Relay operation: connect external supply (9–15 V, recommended 12 V) via barrel jack or terminal block (with Set 2 using the included power supply)
- Connect the relay output (NO/NC) to the desired load, a digital input (DI) of a device or your own monitoring system
- 1W-UNI sensor operation: connect the sensor via RJ11 cable to an HWg device (e.g. STE2, Poseidon2, Ares, Perseus); supply is via the RJ11 connector, the sensor is automatically detected via its unique sensor ID
- Optional: extend the WLD zone with an extension cable if required (max. 185 m) or use multiple sensors for additional zones
Why the WLD Relay 1W-UNI is the right choice
Long zone
Up to 185 m sensing cable in one zone.
Two outputs
Relay (NO/NC) or RJ11 1W-UNI, depending on application.
Even without Ethernet
Early warning even at locations without network connection.
Cable break detection
A disconnected sensing cable is reported as a separate state.
Robust technology
No bend, twist or pressure limits for the sensing cable.
24-month warranty
According to the manufacturer with 24 months warranty.
Why a WLD system delivers more than a flood detector
A WLD system with sensing cable is more expensive than simple point water detection, but reacts significantly faster to water in the room.
Early warning, which is already triggered by the first drops of a liquid, helps avoid significant damage to IT or other infrastructure. According to the manufacturer, water detection with sensing cable is recommended in IT, data centers, technology, in the medical sector and wherever water damage would be very expensive.
Compared to spot detectors such as the Flood detector 1W-UNI, the WLD Relay 1W-UNI offers the following advantages:
Area monitoring
Detects liquids along the entire cable length (up to 185 m), not only at one point.
Flexibility
Usable as a standalone device with relay output or integrated into a monitoring system via 1-Wire UNI.
Reusability
The sensing cable can be cleaned and reused after a leak.
Reliability
Detects cable interruptions and minimises false alarms.
Expandability
Supports long cable runs and integration into complex monitoring systems.
Practical application examples
- Water leak sensor for security systems and under raised floors
- Detection of leaking pipes (cable routed along the pipe)
- Protection against water ingress through skylights (cable routed along the walls)
- Water detection in drip trays
- Water detection under air conditioning units
- Server rooms and data centers: protection against leaks under raised floors or near air conditioning units
- Flood and fire detection in hotels or hostels
- Base stations (Base Transceiver Stations, BTS): protection of telecommunications equipment against water damage
- Industrial plants: detection of leaks in cooling systems (e.g. with ethylene glycol) or water pipes
- Building infrastructure: monitoring of basements, archives or museums
- Hotels and holiday homes: protection against leaks in heating or water systems
Frequently asked questions
What is the HW group Sensor WLD Relay 1W-UNI and what is it used for?
The Sensor WLD Relay 1W-UNI is a universal water leak sensor with one input for a WLD sensing cable type A/B. It reports water or a disconnected cable via a relay output (NO/NC) or as a 1W-UNI sensor via RJ11 to an HWg device.
What is the difference between Set 1 and Set 2?
Set 1 is the pure device without sensing cable and accessories. Set 2 is a starter set with sensor, 2 m WLD sensing cable type A, 2 m WLD-A connection cable, two J-clips and power adapter.
How long may the sensor zone be?
A WLD zone may be up to 185 m long. The sensing cable can be extended with a two-core cable (max. 185 m) and can be divided into several segments to monitor only critical points.
Which liquids are detected?
The WLD sensing cable detects even a few drops of water, ethylene glycol or other conductive liquid along its entire length.
Does the sensor require its own power supply?
For the relay output, an external supply of 9–15 V DC (recommended 12 V) is required. As a 1W-UNI sensor on an HWg device, it is powered via the RJ11 connector.
How does the sensor report an alarm?
Via the RJ11 bus the status is transmitted as a value (0 = OK, 1 = flooded, 2 = disconnected). At the relay output, open means “OK” or “device off”, closed means “sensing cable flooded or disconnected”.
What types of alarming are possible?
When connected to compatible HWg devices, the sensor supports alarms by e-mail, SNMP trap, SMS or call via an external SMS gateway (e.g. HWg-SMS-GW3) as well as via the SensDesk portal. In addition, the relay output can directly control alarm systems or sirens.
Is a sensing cable included in the scope of delivery?
Only with Set 2 (2 m WLD sensing cable type A and 2 m connection cable). With Set 1 the sensor is supplied without sensing cable; the WLD sensing cable type A must be ordered separately.
Can the sensor be integrated into existing systems?
Yes. As a 1W-UNI sensor it works with HWg devices such as Poseidon2, Ares, STE2, Damocles or Perseus. Via SNMP, HTTPS, XML and an open API it can be integrated into third-party software; it is also part of the SensDesk portal.
Can the sensing cable be reused?
Yes. The cable can be cleaned, dried and reinstalled. It has no bend, twist or pressure limits within reasonable bounds.
Can I monitor multiple zones?
One sensor supports exactly one WLD zone. For multiple zones, several sensors can be used on one Poseidon or Ares device.
Questions about the Sensor WLD Relay 1W-UNI?
Our support team in Germany advises you free of charge on selection, sensors and configuration.
- Set1:
WLD only - Simple external sensor unit - Set2:
WLD + 2+2m Starter Set with WLD Sensor Cable A - 2m, WLD Relay Unit, 2x J-Clips, Power Adapter and WLD A Connection Cable 2m
Detection:
- Liquid detection: Water, ethylene glycol, other conductive liquids along the entire cable length
- Zones: 1 WLD zone (max. 85 m sensing cable + 100 m extension cable)
- Status messages: OK / Flooded / Cable disconnected
Sensing Cable:
- Type: WLD sensing cable Type A
- Length: 0.4 m to 85 m (extendable up to 185 m with non-sensitive cables)
- Features: Reusable (can be cleaned and dried), no limitation by bending radius, twisting, or pressure
Outputs:
- Relay output: NO/NC, max. 1A / 30V (requires 12V power supply)
- Bus interface: 1-Wire UNI (2x RJ11)
Power Supply:
- External: 12V DC / 0.1A (barrel connector or terminal block)
- Via bus: 1-Wire UNI bus (no power supply required)
General Specifications:
- Dimensions: 65 × 80 × 30 mm
- Weight: Approx. 122 g (without cable)
- Operating temperature: -10 °C to +60 °C
- Enclosure: Plastic, IP33, for indoor use
- Mounting: Wall or horizontal surfaces
- Compatibility: Poseidon2, Ares, STE2, Damocles, SiteMon (with 1-Wire UNI support)
- Certifications: CE, FCC Part 15, Class B
Monitoring devices
Other available sensors
Extension units
Accessories
DB9 LapLink Cable 2m A LapLink cable (also known as Lablink or null-printer cable) is a cable used to connect two computers directly via a cable connection. Housing: Plastic Type: Cable
Mounting Plate D Bracket for Ares and Poseidon2 Operating environment: -3°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 74 x 6 x 120 (W x H x D) / 58g Warranty: 24 months Wall mounting plate for Ares, Poseidon2 3266/68 and other products.
DIN-Rail Box Set A mounting kit for installing HW-group devices on a DIN rail. Applications and Use: Mounting kit for installing HW-group devices with metal housing on a DIN rail. Operating environment: -30°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 45 x 11 x 105 (W x H x D) / 22g
Mounting Kit Screw set for mechanical mounting Applications and Use: Screw set for mechanical fastening
Mounting Plate E- 1U Rack (cabinet) mounting plate, 1U mounting for HW-group Ares and Poseidon2 devices Operating environment: -30°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 127 x 45 x 94 (W x H x D) / 137g Warranty: 24 months Rack (cabinet) mounting plate, 1U mounting for HW-group Ares, Poseidon2 3266/3268 and other products.
Mounting Plate L DIN Rail DIN rail mounting plate for Ares, Poseidon2 3268, and other products. Features: Metal housing Wall mounting Applications and Use: Profiles for metal-encapsulated HWg devices for wall mounting. Dimensions: 150 x 120 x 45 (W x H x D) / 65g Warranty: 24 months
Mounting Kit for Poseidon2 4002 and HWg-SMS-GW3 Applications and Use: Mounting kit for Poseidon2 4002 and HWg-SMS-GW3 Operating environment: -30°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 136 x 45 x 16 (W x H x D) / 165g Warranty: 24 months
Rack Shelf 1U A versatile solution for easy mounting of HW-group devices in 1U racks. Operating environment: -30°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 485 x 44 x 104 (W x H x D) / 597g Warranty: 24 months Housing: Metal Type: Wall mounting This shelf makes it easy to use devices in racks. You can even combine different 1U products and sensors.
Software
Manufacturer information:
HW group s. r. o.
Rumunská 26
Prague, 120 00
Czech Republic
Phone: +420 222 511 918
Email: sales@hwg.cz
Responsible person:
Didactum® Security GmbH
Im Mühlenfeld 4
48163 Münster
Deutschland
Fon:
(+49) 250 19 71 63 54 / (+49) 171 33 11 577
Email: info@didactum-security.de
