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Function and purpose

Product page: https://vutlan.com/analog-sensors/91-vt591-leak-sensor.html

Datasheet page: https://vutlan.atlassian.net/l/cp/FxCBogKP

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The sensor detects water by the VT591 Water Leak Sensor is designed to detect water leaks by sensing a drop in resistance of along the WLC water leak cable. The sensor must be used together with the WLC leak cable. WLC leak cable is ordered separately, different lengths can be ordered.connected WLC Water Leak Cable. This sensor requires the use of a WLC Leak Cable, which is ordered separately and available in various lengths to suit different installation needs.

The WLC Leak Cable is designed to provide comprehensive coverage for leak detection across large areas, such as under-raised floors in data centers or around sensitive equipment. It can be laid out to cover the entire perimeter of a room or specific areas that are vulnerable to leaks. By positioning the cable along the edges of the floor, near water pipes, HVAC systems, or around server racks, the cable ensures that even small amounts of moisture are detected anywhere within the monitored zone.

This flexibility allows the WLC cable to create a continuous detection loop, covering the full floor perimeter, and making it ideal for large spaces. It offers protection by providing alerts as soon as water is detected, minimizing the risk of damage to critical infrastructure

The VT591 can be connected to any analog port (A1...A8) of the Vutlan monitoring unit.The maximum amount of VT591 sensors connected to a single monitoring unit and the maximum length from the monitoring or extension unit can be extended using the VT408 / Sensor extension unit, enabling real-time detection and alerts in the event of a water leak. For larger installations, the number of connected sensors and overall system length can be expanded using the VT408 Sensor Extension Unit, ensuring flexible coverage of areas prone to leaks.

This sensor is ideal for preventing water damage in data centers, server rooms, and other critical facilities where early leak detection is essential.

	"WLC / Water leak cable" is ordered separately!  When water is in contact with the detection cable, a resistive sensor indicates the emergence of moisture. The whole area can be effectively monitored by placing the cable near or with possible flood sources.

Used for

The VT591 Water Leak Sensor is used for:

1. Water Leak Detection: Monitors for water leaks in critical environments such as data centers, server rooms, and building facilities. It detects water by sensing a drop in resistance along the connected WLC Water Leak Cable.

2. Early Warning Systems: Provides real-time alerts when a leak is detected, helping to prevent water damage to equipment, infrastructure, or sensitive areas by enabling rapid response.

3. Flexible Installation: Can be installed along pipelines, around sensitive equipment, or in areas prone to flooding. The connected WLC Water Leak Cable can be ordered in different lengths, allowing the sensor to monitor large or hard-to-reach areas.

4. Integration with Monitoring Systems: It connects easily to any Vutlan monitoring unit, and the number of sensors can be expanded using the VT408 Sensor Extension Unit, making it suitable for large-scale installations.

This sensor is essential for preventing water-related damage in mission-critical environments.Order options

Dimensions

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Usage examples

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Technical specifications

Package content VT591

Included page https://vutlan.atlassian.net/wiki/spaces/DEN/pages/232259595/VT591+package+content

Package content WLC

Included page https://vutlan.atlassian.net/wiki/spaces/DEN/pages/2921463809/WLC+package+content

Connecting WLC / Water leak cable

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Do not do illustration	Description
	Panel panelIconId atlassian-warning panelIcon :warning: bgColor #FF8F73 The cable can not touch itself. It needs to be straightened.
	Panel panelIconId atlassian-warning panelIcon :warning: bgColor #FF8F73 Do not twist or press down the cable too much. This may lead to deformation. The cable has two sensing wires, these wires can not touch each other.
	Panel panelIconId atlassian-cross_mark panelIcon :cross_mark: bgColor #FF8F73 Do not put the cable on a conductive surface.
	Panel panelIconId atlassian-cross_mark panelIcon :cross_mark: bgColor #FF8F73 You can cut the cable, but you need to isolate the ends so that they do not touch each other. And do not loop the cable.

1. Connect the "VT591 / Water leak sensor" to the monitoring unit. The connection is plug-an-play.

2. Connect the terminal cable to the VT591 sensor.

3. Connect "WLC / Water rope" to terminal cable.

4. Connect any additional "WLC / Water leak cables" to each other as shown in the picture above to make a chain connection.

5. Wire the WLC rope around or under potentially leaking objects around the perimeter or under the raised floors.

6. Put a protective cap on the connector of the last WLC cable in a chain.

7. The sensor is ready to use.

Analog sensor connection

Page link https://vutlan.atlassian.net/wiki/spaces/DEN/pages/1016274/Analog+sensors+connection

Sensor configuration

Page link https://vutlan.atlassian.net/wiki/spaces/DEN/pages/1016314/Sensor+configuration

How to test the sensor & sensor cable

1. Connect the WLC cable to VT591. Connect VT591 to the analog port of the system. The sensor should appear in the Vutlan Web Interface >> “System tree” panel >> “System group” tab >> “Autodetect” sensors. Make sure that the WLC cable is straight or not contacting itself, or any conducting material. The sensor should appear in the system as “Normal” (if the behavior is set to “Normal”), which means that there’s no presence of liquid (the two yellow wires along the WLC cable are not cables shorted).

2. Take a rag and wet it a little. Touch the rag to both yellow ires on the WLC cable. This should shorten the contact. The VT591 sensor should change the state to “Alarm”.

3. Dry the cable carefully with a dry cloth.

Installation examples

Please find installation examples in our articles "Water leakage detection using cable sensor and spot sensor" and "Leak detection under raised floors in data centers".

Cable layouts

	Cover the whole area Comprehensive protection for critical areas
	Cover the edge area Prevent leaks from immersing in or spreading out
	Covering air-conditioned areas Key protection against major leakage sources such as alr conditioners

Cable pinouts

The sensor uses a standard Vutlan analog sensor cable(RJ11/RJ12 to RJ11/RJ12) for connecting to the monitoring unit. You can find further instructions at the Analog sensors connection

Technical support

The device does not contain any user-serviceable parts. If the power meter requires service, contact your local sales representative. Do not open the device. Opening the device voids the warranty.

Schematics / Sensitivity adjustment

You can change the R10 resistor using the following schemes.

For example, if your room has very high humidity and the cable is in an alarm state without the spilled liquid being present, you can change R10 to 270k. This should lower the sensitivity level.

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Troubleshooting

The following table describes potential problems and their possible causes. It also describes checks you can perform or possible solutions for each. After referring to this table, if you cannot resolve the problem, contact your local Vutlan sales representative for assistance.

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