Inserting and starting your Guardian sensor


MiniMed 780G insulin pump with Guardian Sensor 3
MiniMed 780G insulin pump with Guardian 4 sensor

Device: MiniMed 780G insulin pump with Guardian Sensor 3

Gather Your Supplies

Before you insert your sensor, gather all of your supplies:

  • One-press serter is required in order to insert the sensor properly.
  • Guardian Sensor 3 is individually packaged and comes attached to a plastic pedestal which is necessary for proper loading into the serter.
  • Oval Tape is required to keep the sensor securely in place.
  • The Guardian Link 3 transmitter is connected after the sensor is inserted and is then covered with the oval tape.

Choose a Site

The Guardian Sensor 3 has been studied and is approved for use in the following sensor insertion sites by persons of the following ages:

Approved Age Sensor Insertion Site
7-13 Abdomen and Buttocks
14 and older Abdomen and Arm*

*Assistance may be needed for sensor insertion into back of upper arm and into the buttocks. Some users found it difficult to insert the sensor into the arm and buttocks by themselves.

Choose a location for inserting your sensor. Shown here are the approved body areas (shaded) for sensor insertion:

insertion locations for Guardian Sensor 3

The sensor insertion site should be at least:

  • 1 inch away from your insulin pump infusion site
  • 1 inch away from any manual insulin injection site (syringe, pen)

For best sensor glucose performance, avoid these sites:

  • Where clothing may rub or constrict
  • Where your body naturally bends a great deal and may cause the sensor to pull out
  • Where you have scarred or hardened tissue or stretch marks
  • Where there is a great deal of motion or friction

Inserting the Sensor

Abdomen insertion:

Video thumbnail


Starting Your Sensor

After the sensor is inserted and paired with the transmitter, the pump will display a “Start New Sensor” screen.

To start a new sensor:

  1. Select Start New Sensor when it appears on the pump screen.

    Inserting and Starting your sensor screen

  2. The “Sensor warm up X:XX hr” message appears

    Note: It may take up to five minutes for the “Sensor warm up X:XX hr” message to appear. The warm up period lasts two hours.
  3. Select OK.

    The "Sensor warm up..." message appears on the Home screen until the sensor is ready for its first calibration.

    Sensor warm up screen


Disconnecting the Transmitter and Removing the Sensor

When your sensor life is depleted you will need to remove your sensor to insert a new one.

To disconnect the transmitter from the sensor and remove the transmitter:

  1. Carefully remove the tape and any additional adhesive from the transmitter.
  2. Remove the adhesive tab from the top of the transmitter.
  3. Hold the transmitter with one hand and pinch the flexible side arms of the sensor with the thumb and forefinger of your other hand.
  4. Gently pull the transmitter away from the sensor.
  5. Pull the sensor away from your body to remove it.
  6. Dispose of the sensor properly, in a sharps container.
  7. Place the transmitter on the charger.



Device: MiniMed 780G Insulin Pump with Guardian 4 sensor

Gather Your Supplies

Before you insert your sensor, gather all of your supplies:

  • One-press serter is required in order to insert the sensor properly.
  • Guardian 4 sensor is individually packaged and comes attached to a plastic pedestal which is necessary for proper loading into the serter.
  • Oval Tape is required to keep the sensor securely in place.
  • The Guardian 4 transmitter is connected after the sensor is inserted and covered with the oval tape.

Choose a Site

The Guardian 4 sensor has been studied and is approved for use in the following sensor insertion sites by persons of the following ages:

Approved Age Sensor Insertion Site
7 and older Back of upper arm*

*Assistance may be needed for sensor insertion into back of upper arm. Some users found it difficult to insert the sensor into the arm by themselves.

Choose a location for inserting your sensor. Shown here are the approved body areas (shaded) for sensor insertion:

insertion locations for Guardian 4 Sensor

Insertion on abdomen for ages 7-17 years has not been evaluated for accuracy.

The Guardian 4 sensor is indicated for arm use only. Do not use Guardian 4 sensor on the abdomen or other body sites including the buttocks, due to unknown or different performance that could result in hypoglycemia or hyperglycemia.


The sensor insertion site should be at least:

  • 1 inch away from your insulin pump infusion site
  • 1 inch away from any manual insulin injection site (syringe, pen)

For best sensor glucose performance, avoid these sites:

  • Where clothing may rub or constrict
  • Where your body naturally bends a great deal and may cause the sensor to pull out
  • Where you have scarred or hardened tissue or stretch marks
  • Where there is a great deal of motion or friction

Inserting the Sensor

Back of arm sensor insertion:

Video thumbnail


Starting Your Sensor

After the sensor is inserted and paired with the transmitter, the pump will display a “Start New Sensor” screen.

To start a new sensor:

  1. Select Start New Sensor when it appears on the pump screen.

    Inserting and Starting your sensor screen

  2. 5. The “Sensor warm up X:XX hr” message appears.

    Note: It may take up to five minutes for the “Sensor wamp up X:XX hr” message to appear. The warm up period lasts two hours.
  3. Select OK.

    The “Sensor warm up X:XX hr” message appears on the Home screen until the sensor warm up is complete. After the warm up is complete, the pump begins receiving SG readings.

    Sensor warm up screen


Disconnecting the Transmitter and Removing the Sensor

When your sensor life is depleted you will need to remove your sensor to insert a new one.

To disconnect the transmitter from the sensor and remove the transmitter:

  1. Carefully remove the tape and any additional adhesive from the transmitter.
  2. Remove the adhesive tab from the top of the transmitter.
  3. Hold the transmitter with one hand and pinch the flexible side arms of the sensor with the thumb and forefinger of your other hand.
  4. Gently pull the transmitter away from the sensor.
  5. Pull the sensor away from your body to remove it.
  6. Dispose of the sensor properly, in a sharps container.
  7. Place the transmitter on the charger.

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