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Visonic MCT-550 SMA Water Sensor Battery Installation

Learn how to install a battery in the Visonic MCT-550 SMA Water Sensor.

What You'll Need
  • XFINITY Home - Secure or XFINITY Home - Automation
  • MCT-550 SMA Water Sensor
  • A Phillips-head screwdriver
  • One CR2 battery
  • Double-sided tape (optional)

How to Install the Battery

Before proceeding, make sure that your system is disarmed. Working on devices while the system is armed can generate false alarms.

Did You Know? You may want to have some double-sided tape on hand if you need to remove your Sensor from the wall to install a battery. Use the tape to reattach your Sensor if its existing adhesive fails to hold it in place.

Do You Need A Battery? Make sure you have a battery before you proceed. Easily order your replacement battery from www.batteryjunction.com or visit your nearest battery retailer.

Help Protect Our Environment: Please properly recycle your discarded batteries. For your convenience, batteries are accepted for recycling at various locations. Check www.call2recycle.org or call 1-800-8-Battery (1-800-8-228-8379) to find a recycling location near you.

Is This Your Sensor? Make sure that your Water Sensor looks like the one in the image below. If it does, you're in the right place to find out how to install a battery in your Water Sensor.
Frontal view of the Visonic MCT-550 SMA Water Sensor.
  1. Locate the screw on the top of the Sensor. The screw head will have an indentation that looks like an X.
  2. Using a Phillips-head screwdriver, turn the screw counterclockwise until the cover is loose, and then remove the cover from the Sensor. You will see a single battery slot with positive (+) and negative (-) battery placement indicators.
    Removing the screw by turning a screwdriver clockwise.

    Did You Know? Make sure not to press down the tamper (shown below within the blue square) when inserting the battery as this will default the Sensor.

    Take a Look. If a battery is already present, remove it by using your fingertip to gently pull one end of the battery up until is battery is loose. Then, you can pull it free from the slot.
  3. Insert a CR2 battery into the battery slot, matching the positive (+) end of the battery to the positive (+) placement indicator located in the slot. Then, press the battery into place.
    The battery being inserted into the slot inside of the Sensor.
  4. When the battery is inserted correctly, a red indicator light will light up.
    The indicator light illuminated next to the battery.
  5. Slide the two tabs on the bottom of the cover over the slots at the bottom rear of the Sensor. Then, press and hold the top of the cover against the Sensor body.
  6. Insert the screw back into the slot at the top of the Sensor and use a Phillips-head screwdriver to turn the screw clockwise until it's tight.
    The cover being reattached to the Sensor with a Phillips-head screwdriver.

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