An in-depth look at Vaisala’s hydrogen peroxide sensor technology

Webinar: humidity measurement in H₂O₂ bio-decontamination – relative saturation as the key

Join us  for a 1-hour training with Vaisala's industry experts Piritta Maunu and Sanna Lehtinen. Piritta and Sanna will cover the key aspects of measuring humidity in Hydrogen Peroxide bio-decontamination. The focus of this webinar will be the crucial role of the Relative Saturation parameter when monitoring vaporized hydrogen peroxide processes. Learn more & Register

PEROXCAP measurement values, chemical purge, and function

What is the lowest ppm that the HPP270 series probes can measure?The measurement range is from 0 to 2000 ppm ±10 ppm or ±5% of the reading (whichever is greater) at 25 °C. The accuracy specifications are stated from 10 ppm onwards. The HPP270 series probes (HPP271 and HPP272) are not intended for safety level ppm measurements. Does the probe withstand condensation?The probe must always be powered on when there is H₂O₂ in the probe’s environment. When powered on, the PEROXCAP sensor is heated, which permits using the probe in condensing H₂O₂ conditions, maintains measurement performance, and lengthens the probe’s lifetime. If the probe is exposed to H₂O₂ while powered off, the sensor may dysfunction and not recover. As a worst case scenario, the probe is left for a day under higher temperature, with H₂O₂ in high concentration,  under near condensing conditions, the probe would not survive. Refer to the product specifications for HPP270 series, under “Operating Environments.”
 
Can the probe measure liquid H₂O₂?
No, the HPP270 series probes are for vaporized hydrogen peroxide measurement.
Does the probe withstand peracetic acid or acetic acid blends?Vaporized peracetic acid is a very oxidizing agent so the PEROXCAP sensor will not survive in that environment.
Does the probe withstand silver ion blends?
It is not recommended to use the probe with silver ion blends since the silver particles can block the porous filter and therefore deteriorate gas exchange to HUMICAP sensors within the filter. My customer has H₂O₂ vapor sterilization under vacuum. Can we use this probe in a vacuum?The probe is not designed to be used in vacuum conditions.
Can I use this probe in over / under pressure?
The probe is designed for normal atmospheric pressure only. Are Relative Humidity and Relative Saturation measured directly from the sensor?
Relative Humidity is directly measured and Relative Saturation is calculated. (Learn more about these values in this webinar.) Which parameters does the HPP271 and HPP272 output?
The HPP272 outputs H₂O₂ concentration (ppm), temperature and humidity (Relative Saturation and Relative Humidity); The HPP271 outputs H₂O₂ ppm by volume and H₂O ppm by volume.
Why is the absolute hydrogen peroxide unit in mg/m³ and not mg/L?
We have chosen the International System of Units (SI) mg/m³ , whereas mg/L is not an SI unit.How do I convert mg/L to mg/m³
Absolute H₂O₂ mg/m³ (milligrams per cubic meter) can be converted into mg/L (milligrams per liter) by using this formula: