The Probe for Hydrogen Peroxide Environments (H2O2).

Hydrogen Peroxide Sterilization

Hydrogen peroxide (H2O2) is used to sterilize cleanrooms, incubators and other equipment. In this process the air is saturated by gassing or spraying, resulting in the formation of a microfilm on all surfaces. The hydrogen peroxide kills off all microorganisms. The H2O2 is then either recovered mechanically or allowed to decompose naturally over a period of 48 hours to harmless H2O or O2. The humidity level during the application is crucial for the effectiveness of the process.

Standard humidity sensors have difficulty measuring accurately in high concentration H2O2 environments. The Hydrogen Peroxide inhibits the measurement of water vapour by occupying the pores on the surface of the sensor. This is why ROTRONIC has developed a special sensor, the HYGROMER® HH-1. The life of the sensor is greatly extended compared with that of the standard sensor for these applications. Please see the sensor data sheet for exact technical data on the sensor.


  • Measures relative humidity, temperature and dew point
  • With HYGROMER® HH-1 sensor for hydrogen peroxide environments
  • Highest possible measuring accuracy
  • Conforms to FDA CFR21 Part 11/GAMP
Accuracy ±1.2 %RH, ±0.1 K, at 10...30 °C
Probe type Humidity and temperature probe for hydrogen peroxide applications (H2O2)
Measuring range with integrated probe -50…120 °C / 0…100 %RH
Accuracy analog output ±1 mV
Power supply 3.3…5 VDC
Humidity sensor Hygromer HH-1
Temperature sensor PT100 1/3 DIN Class B
Filter type No filter
Response time t 63 <15 sec.
Calculations Dew / Frost point
Continuous H2O2 load 880 ppm / 1200 mg/m3
Current consumption 4.5 mA at 3.3 VDC
Audit Trail/ electronic records FDA 21 CFR Part 11 and GAMP compatible
Analog output signal (standard) 0…1 V = 0...100 %RH
0…1 V = -40...60 °C
(default setting, freely scalable via HW4 software and AC3001 cable)
Communication interfaces UART
Housing Polycarbonate, PEEK
IP protection rating IP65
CE / EMC conform EMC Directive 2007/108/EC
Storage and transport conditions -50…100 °C

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