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  • Welcome
    • What is the Grow Sensor?
    • What does the Grow Sensor measure?
  • Getting started
    • How do I onboard my Grow Sensor?
      • Do I need to charge my Grow Sensor when it arrives?
      • How do I connect my Grow Sensor to my Wi-Fi network?
      • How quickly will I see graph data in the app after onboarding?
    • How do I hang my Grow Sensor in my environment?
    • How do I set up my leaf temperature sensor?
    • How do I charge my Grow Sensor?
    • How do I use the Grow Sensor App?
  • The Grow Sensor
    • What does the Grow Sensor’s button do?
    • How accurate is the Grow Sensor?
    • How do I calibrate the Grow Sensor?
      • Does the Grow Sensor come pre-calibrated?
      • How do I calibrate the humidity sensor?
      • How do I calibrate the CO2 sensor?
      • Do I need to calibrate any other sensors?
      • Can I set offsets to help with calibration?
    • Can the Grow Sensor be used outside?
    • How many Grow Sensors do I need for my growing space?
    • What is the Wi-Fi range of the Grow Sensor?
    • How long does the Grow Sensor battery last?
    • How to set up the Grow Sensor to measure leaf temperature?
    • How to find your device / Grow Sensor ID?
    • Does the Grow Sensor log data offline?
    • Will the sensor inform me if the Wi-Fi connection fails?
    • Why does the Grow Sensor’s LED flash green periodically?
    • Why is the Grow Sensor light flashing red when onboarding?
  • The Grow App
    • How do I use the Grow dashboard?
      • How alerts are displayed?
      • What are grows?
      • How to use dashboard trends?
      • Can I rename a grow?
      • How do I close and start a new grow?
    • How do I use the Grow graphs?
      • What graphs/data can I see?
      • How do I interact with graphs?
      • How often does the graph data update?
      • Can I filter graphs?
      • When does the eDLI (Daily Light Integral) graph reset?
      • How do I use the light spectrum graph in the app?
      • What is leaf VPD, and can I see this in the graphs?
    • How do I set my grow’s night and day photoperiods?
    • How do I set limits and alerts for graphs?
      • How do I set high/low and dangerously high/low limits?
      • Can I create limit templates or recipes?
      • How do I activate push notifications?
      • If you’re not receiving notifications
      • What limits can I set?
      • How do I set lights on and lights of alerts?
      • How does the eDLI limit work?
      • How does the dew point limit work?
  • Substrate probes
    • Can I plug a substrate probe directly into the Grow Sensor?
    • What soil probes are compatible with the Grow Sensor?
    • Which sensors should I purchase?
    • What do the substrate probes measure?
    • Can I change my substrate type in the Grow App?
    • How many substrate probes can I use with the Grow Sensor?
    • How do I position my soil probe for my pot size?
      • How do I place the probe through the pot
      • How do I place the sensor in the pot?
      • *To do* Grow SUB (TBC)
      • Delta-T Wet 150
      • Meter group Teros 12
      • Acclima TDR-310W
      • Acclima TDR-315N
      • The Grow Link Terra Link
    • My VWC reading is too low or high, help!
  • App settings
    • How can I change my account email?
    • How can I change my account password?
    • How can I change the measurement units in the app?
    • How do I access the API?
    • Do you have team Grow account access?
    • How can I opt in to test latest beta software and updates?
  • Making a purchase
    • What are my payment options?
    • Do you offer financing or instalment payment options?
    • Is my payment information secure?
    • Can I split my payment between multiple methods?
    • Do you offer any discounts or promotions on the Grow Sensor?
    • Can I cancel or change an order?
    • How can I be notified when the Grow Sensor is back in stock?
    • Are there any quantity limits for purchasing the Grow Sensor?
  • Returns and refunds
    • Do you have a warranty?
    • Do you have a satisfaction guarantee?
    • Do you have a returns and refund policy?
    • What are the returns conditions?
    • Can I return a Grow Sensor that has been opened or used?
    • What do I need to include when returning the Grow Sensor?
    • What should I do if I receive a damaged or defective Grow Sensor?
      • Do I need to provide evidence of the damage when requesting a return?
    • Can I return or exchange a damaged or defective Grow Sensor?
    • Will the shipping costs be refunded?
    • Will I be reimbursed for shipping if I return a damaged or defective Grow Sensor?
    • Does it cost to make a return?
    • Do I need to pay for shipping when sending back a return?
    • How can I return the Grow Sensor?
    • When will I receive my refund?
    • What can’t I return?
  • Shipping and delivery
    • Do you have a shipping policy?
    • Do you offer international shipping?
    • How long do you ship after I place my order?
    • What are your shipping options?
    • What are your shipping rates?
    • Do you offer express shipping options?
    • How can I track my order?
    • How will I receive shipping updates?
    • How long does delivery take?
    • Can I specify a delivery date or time for my order?
    • Can I change my shipping address after placing the order?
    • Can I reroute my package to a different address if I'm not available to receive it?
    • What happens if I miss the delivery attempt?
    • Tracking says the order has been delivered, but haven’t received it - what do I do?
    • What happens if my package gets damaged during shipping?
    • What should I do if my order hasn't arrived within the expected timeframe?
    • Can I combine multiple orders to save on shipping costs?
    • Do you provide free shipping on orders over a certain amount?
    • Do you offer local pickup as an option?
    • Do you offer signature confirmation upon delivery?
  • Customer support
    • How can I reach the Grow Sensor customer support team?
    • What are Grow Sensor’s customer support hours?
    • How long does it take to receive a response to my inquiry?
    • Can I schedule a phone call or appointment with a Grow representative?
    • What support does Grow Sensor offer for professional growers?
    • What kind of customer support does Grow Sensor provide for troubleshooting?
    • How can I unsubscribe from your mailing list?
    • Can I sign up for a newsletter or email subscription for updates and offers?
    • Can I provide feedback or make a complaint?
    • How can I leave a review?
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On this page
  • Why is CO₂ calibration important?
  • How to calibrate your grow sensor’s CO₂ sensor
  • Step-by-step CO₂ calibration process
  • Troubleshooting CO₂ calibration issues

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  1. The Grow Sensor
  2. How do I calibrate the Grow Sensor?

How do I calibrate the CO2 sensor?

PreviousHow do I calibrate the humidity sensor?NextDo I need to calibrate any other sensors?

Last updated 27 days ago

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Why is CO₂ calibration important?

Over time, CO₂ sensors naturally drift, leading to inaccurate readings. To ensure precise data and optimal plant growth, we recommend calibrating your Grow Sensor’s CO₂ sensor every six months.

What happens if you don’t calibrate?

  • Overestimated or underestimated CO₂ levels can lead to inefficient CO₂ supplementation, wasting resources or stunting plant growth.

  • Incorrect readings may cause poor climate control adjustments, reducing yield and plant health.

Regular calibration ensures accurate CO₂ monitoring, allowing for better environmental control and improved plant performance.

How to calibrate your grow sensor’s CO₂ sensor

Before you start:

1

Choose the right calibration environment

Calibrate outdoors in fresh air, away from traffic, buildings, or direct sunlight. Outdoor air typically contains ~420 ppm CO₂, providing a reliable baseline.

2

Check battery levels

Ensure your Grow Sensor has enough battery to complete the process.

3

Avoid enclosed spaces

Do not calibrate indoors, in a greenhouse, or near plants, as CO₂ levels may be artificially elevated.

Step-by-step CO₂ calibration process

1

Move the Grow Sensor outdoors

Find an open-air location, away from buildings and direct sunlight.

2

Turn on the sensor

The green LED will flash briefly as it powers up.

3

Wait up to 25 seconds

The sensor may need time to complete background tasks.

4

Press and release the button when the LED turns purple

This enters CO₂ calibration mode.

5

Wait for the purple LED to flash for up to 60 seconds

The sensor is preparing to calibrate.

6

Press and release the button again within 60 seconds

The purple LED will flash faster, indicating

7

Calibration begins:

  • Fast-flashing green LED (30 seconds) – The sensor is actively calibrating.

  • Fast-flashing red LED (30 seconds) – The calibration process is completing.

8

Calibration complete

The LED will flash white once, confirming successful calibration.

9

Return the Grow Sensor to your grow environment

Your CO₂ sensor is now recalibrated and ready to use.

For a full breakdown of button functions, check out the .

Troubleshooting CO₂ calibration issues

What if the calibration fails?

If calibration fails, the red LED will continue flashing instead of flashing white at the end.

Possible causes & solutions:

  • Calibrated in an enclosed or CO₂-rich environment → Move the sensor to an open outdoor space and try again.

  • Calibration was interrupted → Restart the process from step 1.

  • Battery too low → Charge the sensor and attempt calibration again.

How do I cancel a calibration?

To abort the calibration process, press and hold the button for 5 seconds. The sensor will return to normal operation.

What happens if I forget the sensor outside?

Your Grow Sensor will automatically wake up and resume normal readings. However, prolonged outdoor exposure isn’t recommended, so be sure to bring it back inside once calibration is complete.

Still have questions? Contact us at we’re happy to help!

complete flow diagrams here
support@growsensor.co