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Adding CO2 to MTR-1

You'll slide your sensor out of its case, fit the SCD40 module onto its mezzanine connector, and put the case back together.

1. Unplug your MTR-1 from power and remove the stand if attached.

Back of the MTR-1 with the stand still attached beside the USB-C portBack of the MTR-1 with the stand removedPinching the MTR-1 backplate to lift it off the caseMTR-1 with the backplate removed, showing the circuit board inside the case

2. Flip the MTR-1 upside down and gently tap the case on the table and your MTR-1 should slide out of the case.

MTR-1 board slid out of its case, with the HLK-LD2450 radar module on top

3. With the case removed, identify the bottom right corner of where the small black mezzanine connector lives. You will see an "X" indicating which corner needs to be lined up with the SCD40 CO2 sensor. There is an X on the SCD40 sensor's PCB as well, you can see it in the image below. There is also a "gold dot" in the top left of the SCD40 when oriented properly.

Close-up of the X mark next to the CN1 mezzanine connector on the MTR-1 boardSCD40 CO2 module with its X mark lined up below the MTR-1 mezzanine connector

4. Gently push the SCD40 CO2 module onto the black mezzanine connector.

Pressing the SCD40 CO2 module onto the MTR-1 mezzanine connectorSide view of the SCD40 CO2 module seated flat on the MTR-1 board

5. Slide the case back over the MTR-1, making sure that the case has the hole for the LUX Sensor facing the right direction (to the right).

Sliding the case back down over the MTR-1 board

6. Flip the MTR-1 back over to prepare to put the back case on.

Back of the MTR-1 board in its case, flipped over and ready for the backplate

7. Gently press the backplate of the MTR-1 case onto the MTR-1 until it lightly snaps into place. Please do not force it, if necessary please repeat steps above until it seats in the case without any force required.

Pressing the backplate onto the MTR-1 case near the USB-C portPressing the backplate down until it snaps into the MTR-1 case

8. Put the stand back on if applicable.

Reassembled MTR-1 with the stand attached beside the USB-C port

9. Please refer to our CO2 calibration guide to calibrate the CO2 module after installation. This is required for all CO2 addons purchased from us separately from a product (such as buying it to add on to an existing Apollo device).