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Calibrating G7 O3 Sensors

Calibrating O3 Sensors

Updated: February 8, 2024

This article describes how to calibrate a G7 or G8 device equipped with an ozone (O3) sensor.

The calibration of ozone (O3) sensors requires the use of a gas generator, connected to a gas bottle containing 20% oxygen balanced with nitrogen to supply calibration gas. Always refer to the user manual provided with your gas generator for detailed instructions on setting up and operating the unit.

A single-gas calibration cap must be used to calibrate O3 sensors. The cap directs the flow of generated ozone directly to the sensor through the cartridge face opening.

Use the Blackline Safety single-gas calibration cap (ACC-S-CAL-E) to calibrate O3 sensors. This cap ensures that sufficient gas is supplied to the sensor during calibration. For more information on the cap, contact the Blackline Safety Technical Support team.

Important:

The calibration cap is rated for use in temperatures between 5°C and 40°C (41°F and 104°F). When not in use, the calibration cap should be stored away from direct sunlight.


CAUTION:

Never use a multi-gas calibration cap to calibrate O3 sensors. Never use G7 Dock to calibrate O3 sensors.

  1. Ensure that the O3 generator you are using has been warmed up and stabilized before using it as a calibration source. Refer to the operating manual for the generator you are using for detailed instructions.
  2. Attach tubing to the calibration cap and to the outlet of the gas generator.
  3. Set the flow rate for the gas generator according to the generator manual.
    Note:

    The appropriate flow rate depends on the gas generator you are using. Always follow the instructions provided with your generator when setting the flow rate of the oxygen source for O3.

  4. Press the center button to display the Main menu.
  5. Navigate to Gas options using the left and right buttons, then press OK.
  6. Navigate to Calibration using the left and right buttons, then press OK.
  7. When prompted, select Yes to start the calibration.
    The device performs a hardware self test of its lights, sound, and vibration.
  8. On the display screen select the O3 sensor, ensuring that any other sensors are not selected.
  9. Use the left and right buttons to select Start span, then press the center button to start the calibration.
    The device starts a countdown from 60 seconds.
  10. Attach the calibration cap to your device and apply the gas within this time window.
    The device automatically detects the gas and starts the calibration.
  11. Turn off the gas when prompted, then press the center button to complete the calibration.
    The device displays a pass or fail message and when your next calibration is due.
  12. Allow the residual gas to clear, then disconnect the calibration cap, and let your device sit in clean air until the readings stabilize.
Ozone (O3)

Last updated: March 13, 2026