Caring for your sensor and transmitter


Proper care and maintenance of your sensor and transmitter will ensure optimal performance and continued reliability.

Transmitter in person's hand


Charging your transmitter after each sensor use is important so your transmitter battery lasts 7 days.

When the transmitter is charging, a green light flashes on the gray charger. When charging is complete, the green light on the charger turns off. It can take up to two hours to fully recharge, but typically only takes 15 to 20 minutes. A fully charged transmitter can be used for a maximum of seven days without recharging.

transmitter inserting into charger

transmitter inside the charger

Note: Your transmitter may look different, but the steps to charging it are the same as shown here.


Removing the transmitter from the charger

When you remove the transmitter from the charger, a green light should flash on the transmitter. If you don’t see the green light flash on the transmitter, place the transmitter back on the charger until it is fully charged.

transmitter with blinking green light


Troubleshooting

If you connect your transmitter to the charger and you see no lights on the charger or a flashing red light, replace the AAA battery in the charger. If there are still no lights on the charger after replacing batteries, contact 24-Hour Technical Support at 1-800-646-4633 and select option 1.

Check out more Transmitter Battery Tips.

If you have adhesive residue on your transmitter, here’s how to remove it:

  1. Make sure the tester is attached to the transmitter.

    tester inserting into transmitter

    Note: Your transmitter may look different, but the steps to cleaning it are the same as shown here.

  2. Soak a cotton swab in a medical adhesive remover.
  3. Hold the tester and gently rub the adhesive residue on the transmitter until it is fully removed.

    cotton swab cleaning transmitter

  4. Continue with the cleaning your transmitter.

If ever you’re not actively using your transmitter, store the transmitter (along with the charger and tester) in a clean, dry location at room temperature. Although not required, you may store the transmitter on the charger. Don’t store the transmitter on the charger for more than 60 days at a time, as it can permanently damage the battery.


Charging your transmitter

Storing transmitter in charger: If storing transmitter in the charger, remove the transmitter at least every 60 days.

Charger and transmitter

Transmitter out of charger


Did you know? Your transmitter has a one-year warranty. The use of transmitters beyond one-year may result in reduced battery life, more frequent lost sensor alerts, and more alarms.

If at any time during that one-year warranty period you should experience a malfunction, Medtronic will replace your transmitter at no charge.

If your warranty ends and you experience malfunctions, Medtronic will need to contact your healthcare provider and insurance company to determine your coverage and if there may be an out-of-pocket cost.

You can request a replacement transmitter by calling our 24-Hour Technical Support team at 1-800-646-4633 and selecting option 1 or by logging in to your Diabetes.shop account.


Linking your transmitter to your device

If you’ve received a replacement transmitter, follow the steps below to connect the transmitter to your device.

Important: Before you link your transmitter to your device, make sure the sensor feature is turned on. To check that your sensor feature is turned on:

  • For MiniMed™ 670G/770G/780G insulin pump: Main Menu > Options > Utilities > Sensor Settings > Sensor: On
  • For MiniMed™ 630G insulin pump: Main Menu > Sensor Settings > Sensor: On

MiniMed™ 670G/770G/780G system

  1. Make sure the transmitter is on the gray charger.
  2. Navigate in your pump to: Main Menu > Options > Utilities > Device Options > Manage Devices > Select your CGM number > Delete.
  3. Once your old transmitter is deleted from your pump, you can now connect your new one.

  4. Navigate: Main Menu > Options > Utilities > Device Options > Pair Device.
  5. Remove the transmitter from the charger watching for the green light to blink on the transmitter – immediately select search on your pump.
  6. Once the pump detects the transmitter, a message will pop up displaying the serial number (starting with “GT”) that’s on the back of the transmitter. Check that it matches your new transmitter, select it by pressing the center button, then select confirm to pair the device.
  7. Once the pump displays "Pairing Successful", you may place the transmitter back on the charger. You are now ready to insert your sensor.

    How to replace your transmitter

Linking your transmitter to your device

MiniMed™ 630G system

  1. Make sure the transmitter is on the gray charger.
  2. Navigate in your pump to: Main Menu > Utilities > Device Options > Manage Devices > Select your CGM number > Delete.
  3. Once your old transmitter is deleted from your pump, you can now connect your new one.

  4. Navigate: Main Menu > Utilities > Device Options > Connect Devices > Auto Connect > Continue.
  5. Remove the transmitter from the charger watching for the green light to blink on the transmitter – immediately hit search on your pump.
  6. Once the pump detects the transmitter, a message will pop up displaying the serial number (starting with “GT”) that is on the back of the transmitter. Check that it matches your new transmitter and select Confirm.
  7. Place the transmitter back on the charger. You are now ready to insert your sensor.

Guardian™ Connect system

Pairing a transmitter

  1. Open the Guardian™ app.
  2. Tap on the 3 parallel dashed lines in the top left-hand corner of your screen.
  3. Tap on Sensor & Transmitter > Pair Transmitter.
  4. Follow the in-app instructions to pair your replacement transmitter.

Note: Depending on your mobile phone, you may be prompted to delete or "forget" your old transmitter before pairing the new one.


Re-pairing an old transmitter

  1. “Forget” your transmitter. Open your smartphone Settings > tap Bluetooth > find your CGM transmitter and tap the “i” next to it > tap Forget This Device.
  2. Follow the steps below to pair a transmitter.