Cl₂ is considered a sticky gas. Sticky gases are a group of toxic gases that tend to sorb (absorb or adsorb) with surfaces, such as sampling tubing or the exterior of gas detection devices. This means your device response time will be slower than normal when bump testing or calibrating with Cl₂ because of the tendency of the tubing material to interact with the gas flowing along it, slowing down the overall flow of gas to the sensor.

In addition, when calibrating or bump testing devices, the presence of SO₂ can inhibit CI₂ responses and lead to errors in calibration. For detailed information, refer to G7 and G7 EXO Gas Sensor Bump Testing and Calibration Order.

To reduce the impact of all these behaviors, Blackline recommends that you use the following equipment and device settings when bump testing or calibrating devices equipped with Cl₂ gas sensors, or Cl₂ and SO₂ gas sensors.