Calibration and Bump Test Sequence for H2S and ClO2

When calibrating devices, the presence of Hydrogen Sulfide (H₂S) will cause the Chlorine Dioxide (CIO₂) response to show an OL then UL error.

Blackline manufacturing uses a Chloride Dioxide electrolytic generator as the source for CIO₂ calibration gas. The recommended balance gas for the single H₂S source is either nitrogen or a synthetic air blend.

Calibration

To calibrate your sensor effectively when both H₂S and CIO₂ are being sampled, perform the following steps.

1. Using a single gas calibration cap (ACC-S-CAL), calibrate the ClO₂
2. Using a quad-gas calibration cap (ACC-Q-CAL), calibrate the H₂S sensor.
3. After calibration is complete, apply a burst of ClO₂ gas directly to the ClO₂ sensor for 5 to 10 seconds.

   The burst of ClO₂ after the H₂S will help purge the remaining H₂S from the ClO₂ sensor and allow the device to detect gas normally.

Bump Test

To bump the H₂S and ClO₂ sensor combination when a ClO₂ generator is unavailable on-site, perform the bump test on the H₂S sensor using either the single H₂S gas or the standard quad-gas mixture. There is a known cross sensitivity between the quad-gas CO and H₂S.

If you do not have a ClO₂ generator and would like to calibrate or bump test the ClO₂ sensor, contact Blackline Customer Care for additional information on ClO₂ electrolytic cells.