Flood sensor
User Manual

Flood sensor

SKU: PP-SNS-FS

Table of Contents

1. Product Description

The PIERRE Pro Flood Sensor detects standing water and reports it to the controller. IP67, for floor or low wall mounting in plant rooms, bathrooms and basements.

The PIERRE leak sensor detects water or excessive moisture at a specific point and reports it to the system. It is housed in a compact casing and detects water by conductivity or capacitance between its contacts.

What Happens On Detection

  • The sensor reports the detection to the system.
  • A notification is sent to the app, and a local audible alarm can sound.
  • The event can trigger a scenario — most importantly closing a motorised valve on the water supply.

Placement

  • The sensor is wired to a controller input, so it has no battery to replace and can be placed wherever the risk is.
  • Typical positions: under sinks, next to the washing machine and dishwasher, in the basement, at the boiler and at the manifold.
  • The contacts must sit on the floor at the lowest point where water would collect. Mounted above floor level it detects nothing.

Automation

  • Close the main water valve automatically when a leak is detected.
  • Send a notification to the users who need it.
  • Include the sensors in an away mode, so an unattended property is still protected.

Technical Notes

  • A leak sensor is only useful if something acts on it. Where there is a real risk, install a motorised valve on the incoming line and bind it to the sensor.
  • Test at handover with a wet cloth, and confirm both the notification and the valve action.
  • Note where each sensor is placed during commissioning and name it accordingly, so an alert identifies the location without searching.

2. Dimensions

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  • W: 63 mm
  • H: 35 mm
  • D: 13 mm

3. What you need

Wired. Needs a PIERRE PRO or LITE Controller with a free input, plus the Flood sensor. The sensor takes 12 V from the controller.

4. Wiring

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  • Connect PIN 1 of the Flood sensor to +12 V on the controller.
  • Connect PIN 2 of the Flood sensor to a PIERRE input on the controller (e.g. IN1).
Run Wires Cross-section Cable type Conductors
From Flood sensor to PIERRE Controller 2 0.2 mm² (24 AWG) Cat 5e U/UTP +12 V, SIGNAL

5. Flood sensor via App

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  1. Choose Controller
    1. Tap on the Controller that you would like to add new I/O to.
    2. To edit the I/O, click on the Controller to which the I/O is added.
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  1. Add button for Inputs
    1. Inputs tab is selected.
    2. List of Inputs is shown.
    3. In order to add new Input tap on the Add button.
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  1. Choose type - Inputs
    1. From the list that is shown tap on the desired I/O that you would like to add.
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  1. New Leakage sensor
    1. Fill the following form:
      1. Name - Write the name of the Leakage sensor.
      2. Role - Choose Role from the list.
      3. Group - Choose Group from the list. Group is a group of I/O and scenarios that seems most logical to you.
      4. Pin - Choose Pin from the list. Pin is physical place on the Controller where I/O is connected to it.
      5. Photo - Choose photo for the Leakage sensor.
      6. Identifier - This field is the identifier of the I/O in the electrical project.
      7. Advanced - You can choose type of the signal that activates or triggers the Leakage sensor: rising, falling, change, change inverted.
      8. Timeout - It is the duration for which the Leakage sensor will remain active in auto mode.
    2. When you want to confirm your choice tap button Save and Submit.
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  1. Select Roles - Inputs
    1. Tap in the field Roles.
    2. Select checkbox/checkboxes (for multiple choice) next to the Role/Roles that you would like to choose.
    3. To confirm selection tap the button Save/Done.
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  1. Select Groups - Inputs
    1. In this step you should select Group.
    2. Select check box/check boxes next to the desired Group/Groups from the list.
    3. When you want to confirm your choice tap button Done/Save.
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  1. Change photo
    1. Tap on the photo of the Leakage sensor.
    2. You have three options:
      1. Open Library - The phone’s Library will open.
      2. Open Camera - You can take a picture using your smartphone.
      3. Choose default image - Use one of the prepared images.
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  1. Choose Pin
    1. Tap on the radio button next to the Pin that you would like to choose.
    2. To confirm selection tap on Save/Done.
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  1. Advanced - New Leakage sensor
    1. Click radio button next to the type of signal that you would like to choose.
    2. You can choose:
      1. Rising
      2. Falling
      3. Change
      4. Change inverted
    3. You can choose type of the signal that activates or triggers the Leakage sensor.

6. FAQ

Q1: What should I check if the Flood sensor does not work?

Check two things physically: whether the polarity is reversed, and whether the sensor is permanently reporting a flood because its contacts are wet or bridged.

Q2: What do the controller LED colours mean?

Green – online and connected. Red – offline, no network or no internet. Light blue – AP mode, broadcasting its own network for setup. Dark blue – AP mode managed through PIERRE Partner. Purple – searching for an IP address from the router. Orange – downloading a firmware update.

Q3: The sensor does not react in the app. What should I check first?

Check that the sensor has been added to the configuration in the PIERRE Partner application.

Q4: The sensor was just added and shows no state. Why?

A newly added sensor needs a state change before it reports. Wet the contacts once, then dry them.

Q5: How do I check that the sensor is wired correctly?

It must be connected to 12 V and a PIERRE input as shown in the wiring diagram. To find out whether the fault is in the sensor or in the cable, briefly bridge 12 V to the PIERRE input the sensor uses. If the dot turns green in the app, the fault is the sensor or a broken wire.

Q6: When should input and output be on the same controller?

If one input influences an output, both should be added to the same controller. A motion sensor triggering a lamp, for example, performs best when both sit on the same controller.

Q7: Where should the Flood sensor be placed?

Near water sources — under sinks, next to the washing machine and dishwasher, at the water heater, boiler and manifold — with the contacts on the floor at the lowest point where water would collect.

Q8: How should the sensors be wired?

Each sensor is wired individually back to the PIERRE cabinet in a star pattern. INPUT 12–24 V takes 12 V DC from the controller, GND takes ground from the controller, switch terminal K1 (IN) is bridged to INPUT 12–24 V, and switch terminal K2 (OUT) goes to the input on the controller.

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Last updated: October 06, 2026