Pro Tips on H₂O₂ Bio-Decontamination Vaporization & Measurement

In our webinar, "Combining Cutting-Edge Technologies for Effective vH₂O₂ Bio-Decontamination," we received insightful questions from attendees that we couldn’t address during the session. 

This blog shares the answers from Joni Partanen, Vaisala Product Manager, and Emma Nykyri, Cleamix Training Manager. Together they offer practical advice on how to optimize bio-decontamination processes.

Measuring Low ppm Levels with Vaisala Probes

Q: How low can the Vaisala HPP272 probe measure ppm? Can it measure 1 ppm at the end of a cycle?

A: The HPP272 probe measures 0–2000 ppm but is designed for process control, not precise low ppm accuracy. It provides aeration progress indicators but isn't ideal for monitoring safety thresholds like 1 ppm. For low-level accuracy, other sensors should be used.

Temperature Range of HPP272 Probes

Q: What temperatures can the HPP272 probes handle?

A: Hydrogen peroxide can be accurately measured in temperature range of +5 to +50 °C. The probe itself can handle operating temperature of +0 to +70 °C with reduced accuracy, when measuring hydrogen peroxide outside the accuracy specified range.

H₂O₂ Detection Accuracy

Q: Could decomposed H₂O₂ impact the Vaisala sensor accuracy?

A: While decomposition minimally affects the sensors, the stable microclimate within the PTFE filter of the HPP272 mitigates flow dependencies, ensuring reliable H₂O₂ readings.

Measuring Dew Point in Mixed Gases

Q: Can the sensor independently measure dew point in H₂O₂ mixtures?

A: Yes, the HPP272 measures vapor pressures of water and H₂O₂, calculating precise dew points. This helps predict condensation risks, especially during temperature fluctuations.

Calculating vH₂O₂ Cycles

Q: Can we calculate vH₂O₂ needs for a room to achieve 90% relative saturation?

A: Yes, theoretical calculations can predict the required H₂O₂ liquid volume. Consider variables like vaporization efficiency, decomposition rates, airflow, and room dimensions. Cleamix systems, paired with Vaisala sensors, simplify these calculations.

Impact of High H₂O₂ Concentrations

Q: Does high-concentration H₂O₂ damage surfaces?

A: Material compatibility varies. Pre-testing is recommended to ensure finishes withstand higher concentrations. Properly controlled processes minimize risks.

Using 50% H₂O₂ Concentration

Q: Why isn’t 50% aqueous H₂O₂ commonly used?

A: EU regulations limit the availability of 50% H₂O₂ in some markets. Where approved, the Cleamix VCS-series vaporizer units can use it. Compliance with local regulations ensures effective and safe disinfection.

Combining Chemicals Like PAA with H₂O₂

Q: Can we mix peracetic acid (PAA) with H₂O₂ to reduce residual saturation?

A: While feasible, combining chemicals requires careful calibration. Cleamix systems focus on precise vH₂O₂ control, and introducing PAA necessitates additional testing and sensor integration.

For more details on optimizing vH₂O₂ bio-decontamination processes, explore our resources like this application note on the effects of humidity, this FAQ or contact our experts directly. Reliable decontamination starts with accurate data and trusted solutions.