Calibrating G7 ClO2 Sensors

This article describes how to calibrate G7 devices equipped with chlorine dioxide (ClO₂) sensors.

Before you begin:

The calibration of chlorine dioxide (ClO₂) sensors requires the use of a gas generator, not bottled gas, to supply calibration gas. Refer to the user manual provided with your generator for detailed instructions on setting up and operating the unit.

A single-gas calibration cap must be used to calibrate ClO₂ sensors. The cap directs the flow of generated chlorine dioxide directly to the sensor through the cartridge face opening.

IMPORTANT: Never use a multi-gas calibration cap to calibrate ClO₂ sensors. Never use G7 Dock to calibrate ClO₂ sensors.

IMPORTANT: Ensure that the ClO₂ 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.

To calibrate a G7 ClO₂ sensor:

1. Attach tubing to the calibration cap and to the outlet of the gas generator.
   IMPORTANT: The generator should set the appropriate flow rate; however, this may depend on the gas generator you are using. Always follow the instructions provided with your generator.
2. Open the main menu on G7 by pressing OK.
3. Navigate to Gas options using the up and down arrow buttons and press OK.
4. Navigate to Calibration using the up and down arrow buttons and press OK.
5. When prompted, select Yes to start the calibration.
   G7 performs a hardware self test of its lights, sound, and vibration.
6. Select the ClO₂ sensor, ensuring that any other sensors are not selected.
7. Use the up and down arrow buttons to select Start span and press the OK to start the calibration.
8. G7 will begin to count down from 60. Attach the calibration cap to your device and apply the gas within this time window.
   G7 automatically detects the gas and starts the calibration.
9. Turn off the gas when prompted by G7 and press OK to complete calibration.
   G7 will let you know if the calibration has passed or failed, and when your next calibration is due.
   
10. Allow the residual gas to clear, then disconnect the calibration cap and let your G7 sit until the readings stabilize.
11. Gently wipe down the gas sensor cartridge with a cloth dampened in tap water to remove any ClO₂ on the cartridge surfaces.
    NOTE: To remove any ClO₂ gas residue from the cap, Blackline recommends rinsing the calibration cap after completing ClO₂ calibrations.

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Let us know if you have any questions — don’t hesitate to reach out to the Blackline Safety Technical Support team.