Calibration made easy for vaporized H2O2 sensors Janice Bennett-Livingston Published: Nov 12, 2019 Industrial Manufacturing and Processes Life Science The PEROXCAP® sensor for vaporized hydrogen peroxide bases its measurement on two HUMICAP® sensors. To understand how HUMICAP sensors work, it is useful to know a little about thin-film polymer sensors. In this type of sensor, there is a thin layer of polymer between two electrodes. The film absorbs or releases vapor according to humidity changes in the environment. As the humidity changes, the dielectric properties and capacitance of the sensor changes. A dielectric is an insulator that impedes an electric charge; capacitance is the ability of conductive materials to respond to voltage changes. Essentially a thin film polymer sensor is measuring voltage changes that occur with the amount of water vapor in the environment. Electronics within the instrument use the capacitance of the sensor to give a humidity measurement. The PEROXCAP sensor uses two HUMICAP sensors: one with and one without a catalytic layer. The catalytic layer breaks down the hydrogen peroxide so that the HUMICAP sensor with the layer senses only the humidity, while the sensor without the catalytic layer senses both hydrogen peroxide vapor and water vapor in the air. The instrument calculates the difference between the two sensors to give a measurement of H2O2 concentration. Accuracy & Drift However, humidity sensors are different from other sensors, such as temperature sensors, because they are in direct contact with the environment they measure. Although the HPP270 series probes provide the highest accuracy and precision, even the best sensors will drift over time. Dirt, chemicals and temperature changes can also cause a drift in accuracy. Regular calibration mitigates incremental sensor drift and ensures instruments are operating within their specifications. Calibration Options Factory Calibration: We recommend H2O2 calibration at a Vaisala laboratory for traceable calibration service. Calibration for the hydrogen peroxide measurement uses two different H2O2 vapor concentrations. Calibrations on the HPP272 probes are performed for H2O2, Relative Saturation, Relative Humidity, Temperature and analog output. Note that the HPP271 probes measure H2O2 only (no temperature or relative humidity calibration needed.) Calibration service comes with a certificate and full instrument maintenance is optional. For factory service, find your nearest calibration center. On-site Calibration: For on-site calibrations, we offer a do-it-yourself option with the HMK15 RH calibrator and Vaisala’s HM70 as a reference and our Insight software. The software shows you the drift in both Relative Saturation (RS) and Relative Humidity (RH) and gives you the possibility to make two-point adjustment to these parameters in order to show the same value as a reference value. Based on the humidity calibration, the software also calculates H2O2 ppm error at a certain ppm level. High quality H2O2 measurement performance is also ensured by calibration and adjustment. Learn more about Vaisala calibration service.
Vaporized Hydrogen Peroxide, Humidity and Temperature Measurement HPP270 Series The Vaisala PEROXCAP® Hydrogen Peroxide, Humidity, and Temperature Probe HPP270 series probes are designed for demanding hydrogen peroxide bio-decontamination.
Indigo500 Series Transmitters The Vaisala Indigo500 series transmitters are host devices for Vaisala Indigo-compatible, stand-alone smart probes. The Indigo500 series include multi-functional Indigo520 transmitter and Indigo510 transmitter with basic features.
Indigo200 Series Transmitters for Vaisala smart probes Vaisala Indigo200 series transmitters are host devices for displaying measurement values from Vaisala's Smart Humidity, Temperature, Dew Point, Moisture in Oil, CO2 and H2O2 Probes.
On-demand webinar: Calibration vaporized hydrogen peroxide probes Maintaining quality and consistency is the top priority in life science industries because reliable measurements are key to achieving quality targets. Measurement accuracy and stability are valued features of any sensor used in life science applications. Understanding the sensor behavior over its lifecycle is typically the most challenging task. Sensor manufacturers can provide guidelines that are based on typical use, but in vaporized hydrogen peroxide bio-decontamination, each cycle has its own characteristics that will change over time. Changes in load and equipment wear are two examples that impact processes. The final evaluation of the sensor maintenance activities always falls in the hands of the application specialist. Even though the quality is amongst the top priorities, reality still sets the limits in finding the economical quality optimum. In this webinar you will learn key considerations for maintaining accuracy HPP270 series vH2O2 sensors. Topics: • Hydrogen peroxide and relative saturation as measurement parameters • Reference measurements in the field and diagnostics • Factory calibration Watch now
HPP270 Series for Bio-Decontamination Processes The Vaisala PEROXCAP® HPP270 series includes an intelligent 3-in-1 measurement probe for vaporized H2O2 bio-decontamination in applications such as isolators and rooms and a basic H2O2 probe HPP271. Read more HMK15 Humidity Calibrator Vaisala Humidity Calibrator HMK15 makes calibration and spot checking of humidity probes and transmitters easy and reliable, although for critical applications we recommend a Vaisala Service Center calibration for best possible results. READ MORE Insight PC Software The Vaisala Insight PC Software gives quick access to the configurations and data of Indigo family probes.Use as a simple service interface for easy set-up, diagnostics, and field calibration and adjustment. Read more HM70 Hand-Held Humidity and Temperature Meter Vaisala HUMICAP HM70 Hand-Held is designed for demanding humidity measurement in spot-checking applications. It is also ideal for field checking and calibration of Vaisala's fixed humidity instruments. READ MORE
HPP270 Series for Bio-Decontamination Processes The Vaisala PEROXCAP® HPP270 series includes an intelligent 3-in-1 measurement probe for vaporized H2O2 bio-decontamination in applications such as isolators and rooms and a basic H2O2 probe HPP271. Read more
HMK15 Humidity Calibrator Vaisala Humidity Calibrator HMK15 makes calibration and spot checking of humidity probes and transmitters easy and reliable, although for critical applications we recommend a Vaisala Service Center calibration for best possible results. READ MORE
Insight PC Software The Vaisala Insight PC Software gives quick access to the configurations and data of Indigo family probes.Use as a simple service interface for easy set-up, diagnostics, and field calibration and adjustment. Read more
HM70 Hand-Held Humidity and Temperature Meter Vaisala HUMICAP HM70 Hand-Held is designed for demanding humidity measurement in spot-checking applications. It is also ideal for field checking and calibration of Vaisala's fixed humidity instruments. READ MORE