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Cisco Meraki

MT12 Installation Guide - Water Detection


The Cisco Meraki MT12 is a cloud managed Water Leak Detection sensor that is exceptionally simple to configure and deploy due to its integration with the Meraki dashboard and the use of BLE technology. The MT family eliminates the complex and costly setup required by traditional solutions by removing the limitations of placement of these sensors.  

About this Guide

This guide provides instructions on how to install and configure your MT12 Environmental Sensors.

Product Overview 

Physical Specifications 

Dimensions 117.1x65.7x23.3 mm (LxWxH)
Protection IPX5 Rated
  • 2x AA Alkaline Battery
  • Permanent DC Power: 5V;0.2A USB-C (Sold separately)
Operating Environment
  • Temperature: 0°C - 55°C (32F - 131F)
  • Relative Humidity: 0 - 95% RH
  • Multicolor, multifunction status LED
  • General purpose button
  • Reset button
  • USB-C port
  • Water Leak Detection Plug(Female)

LED Indicators


  • Rainbow - MT is initializing or looking for a gateway.
  • Solid Green(for n seconds) - Connected to a gateway.
  • Solid Amber(for n seconds) - MT could not find a gateway to connect
  • Flashing Green - MT is upgrading its firmware
  • Flashing Amber - MT is running on a low battery.

To conserve battery life, the LEDs on the MT12 don't always remain ON.

General Purpose Button

The MT12 has a general purpose button on the top which allows you to wake up the sensor and test if it is able to connect to a gateway. This will also upload the current sensor data to the gateway.

Factory Reset Button

Next to the battery compartment, there is a pinhole button to factory reset the sensor. If the button is pressed and held for at least five seconds and then released, the sensor will reboot and it will be restored to its original factory settings by deleting all configuration information stored on the unit.

USB-C Port

The MT12 sensors have a USB-C Port on the bottom that can be used to provide an alternate source of power using a compatible accessory.

Water Leak Detection Probe

On the bottom of the MT12 sensors there’s a tail with female connector for the included Water Lead Detection Cable.

Package Contents

Package Contents.jpg


Unit MT12-HW
Guides Quick Installation Guide
Battery  2x AA Batteries 
Leak Detection Cable 1x MA-CBL-LEAK-1 (8ft/2.4m)
Mounting equipment

Wall Mount Backplate

4x Torx Screws (Driver not included)

1x Magnet

1x VHB Tape
8x VHB Cable anchors
1 x Rubber cap

Pre-Installation Preparation 

You should complete the following steps before going on-site to perform an installation

Configure Your Network in Dashboard 

The following is a brief overview of the steps required to add an MT12 to your network. For detailed instructions about creating, configuring and managing Meraki Sensor networks, refer to the online documentation (

  1. Login to If this is your first time, create a new account.
  2. Find the network to which you plan to add your sensor or create a new network.
  3. Add the sensors to your network. You will need your Meraki order number (found on your invoice) or the serial number of each sensor, which looks like Qxxx-xxxx-xxxx, and is found on the back of the unit or included in the box.
  4. Add the gateway(MV or MR) to the same network as the sensor.

NOTE: Make sure the gateway is in the same network and is online and operational.

MV Set up Instructions and MR Set up Instructions.

List of Compatible Gateways:

MV12(W/NE), MV22(X), MV32, MV72(X) MR36, MR44, MR45, MR46, MR46E, MR55, MR56, MR76, MR86

WARNING: Environmental Sensors are only supported with 2nd Gen MV Cameras and Wifi 6 Compatible APs

Minimum Firmware Version


MT sensors can only connect to a compatible MV gateway running MV 4.8+. Please refer to Managing Firmware Upgrade to schedule an upgrade.


In order to use a compatible MR device as a gateway running MR27.6+ firmware. Please refer to Managing Firmware Upgrade to schedule an upgrade.


Installation Instructions

NOTE: Each MT12 comes with an instruction guide within the box. This Quick Install Guide(QIG) contains detailed step by step guides and images to assist you in the physical installation of the sensors.

Choosing Your Mounting Location

As MT sensors rely on a gateway for connectivity to the Dashboard, while choosing a mounting location, make sure that a working compatible gateway is in range of the sensor.

Some examples of ideal mounting locations:

  1. On a wall to detect any leaks on the floor of a room
  2. Inside or on top of a rack to detect any leaks near the rack.

Mount Location.jpg

For most mounting scenarios, the MT12 has flexible options to provide quick and simple mounting. The instructions are as follows:

1. Start by removing the battery compartment cap and inserting the 2 AA battery into the battery compartment.


2. In order to mount the sensor on different locations, there are 3 options

a. Screws - The mounting plate can be directly screwed onto the wall

b. VHB Tape - Double-sided VHB tape can be used to stick the mounting plate on any type of surface.

c. Magnet - Stick the magnet on any surface and the mounting plate can be stuck to the Magnet.

3. Once the mounting plate is on the desired surface, slide the MT12 sensor onto the plate and use the included Torx screw to secure the sensor.



4. Plug in the Water Leak detection cable to the female jack on the MT12 sensor and lead the cable to the area where you need to monitor the presence of water. The packaging also includes 8x VHB sticky pads that can be used to keep the cable in the desired place.

Every leak detection cable also has a female jack on the other end. The MT12 supports daisy chaining of upto 2 Leak detection cables to cover a larger area. The connector tips are NOT water sensitive. In order for water to be detected, the black/white coiled cable needs to come in contact with the liquid.



WARNING: To avoid water incursion on the female connector of the cable, make sure to use the supplied rubber caps to seal it off. In case the open end of the cable gets wet, it might take a long time for the cable to be detected as Dry. Please leave the cable in a dry area for up to 2 hours and then reconnect it to the sensor.

Testing the Connection

Once the device is mounted at the desired location and added to a network with a compatible gateway, press the General Purpose Button on the top of the sensor to wake up the sensor and sync with the nearest gateway. Refer to LED Indicators section for more details on the status of the sensor.

When the sensor is connecting to a gateway for the 1st time, it will blink Green LED which indicates that it is upgrading to the latest firmware configured on the Dashboard

Support and Additional Information 

If issues are encountered with device installation or additional help is required, contact Meraki Support by logging in to and opening a case by visiting the Get Help section.

For additional information on Meraki hardware and for other installation guides, please refer to

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