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N2O Microsensor

Measure dissolved N2O gas

The Unisense N2O microsensor is a unique sensor offering the possibility of measuring dissolved and gaseous N2O. With a detection limit of less than 0,5 µM and tip sizes down to 25 µm, the Unisense N2O microsensor is a high quality research tool for reliable and fast measurements.

The microsensor construction makes it possible to use the N2O microsensor in a broad variety of research fields where non-destructive, fast and accurate measurements are required. The N2O microsensor is designed for research applications within:

  • Wastewater research
  • Environmental sciences
  • Biomedical sciences
  • Biotechnology

The N2O-R sensor is a more robust version of the normal nitrous oxide sensor with optimized sensitivity and protection cap suited for bulk measurements including wastewater applications.

Microsensor technology

The Unisense nitrous oxide microsensor is a miniaturized Clark-type sensor with an internal reference and a guard cathode.

In addition, the sensor is equipped with an oxygen front guard, which prevents oxygen from interfering with the nitrous oxide measurements.

The sensor is connected to a high-sensitivity picoammeter and the cathode is polarized against the internal reference. Driven by the external partial pressure, nitrous oxide from the environment will penetrate through the sensor tip membrane and be reduced at the metal cathode surface. The picoammeter converts the resulting current to a signal. The internal guard cathode is also polarized and scavenges N2O in the electrolyte, thus minimizing zero-current and polarization time.

For special applications, some versions of the N2O microsensor can be customized to have extremely high sensitivity (25 nM). Please view specifications.

Ordering Information

Standard Glass Sensor Outside tip diameter
N2O-50 40-60 µm
N2O-100 90-110 µm
N2O-500 400-600 µm
N2O-R 400-600 µm - with Cap
N2O-MR 400-600 µm - in guide for microrespiration
N2O-NP 1,6 x 40 mm - needle sensor for piercing
Find the complete list of nitrous oxide microsensor specifications, including warranty and expected life time, below and possible microsensor customizations and adaptations under Related Products found to the right.

View N2O Microsensor Specifications

Patent information
This product is covered by the following patents:
Patent issued in China: CN 104937405 A
Patent issued in USA: 9921178
Patent issued in Japan: JP6275744B2
Patent issued in European EP Region: EP2939012B1
Patent pending in several other jurisdictions.

Technical information

View sensor specifications

N<sub>2</sub>O Calibration Kit Video

N2O Calibration Kit Video

Watch our complete guide to calibrating a Unisense N2O sensor using our N2O Calibration Kit.

Watch Video Guide

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Kampschreur, Marlies J. et al (2008), Dynamics of nitric oxide and nitrous oxide emission during full-scale reject water treatment, Water Research, 812 - 826, vol. 42 Read abstract

Zhou, Yan et al (2008), Development of a 2-sludge, 3-stage system for nitrogen and phosphorous removal from nutrient-rich wastewater using granular sludge and biofilms, Water Research, 3207 - 3217, vol. 42 Read abstract

Elberling, Bo et al (2010), High nitrous oxide production from thawing permafrost, Nature Geoscience, 332 - 335, vol. 3 Read abstract

Horn, Marcus A. et al (2003), The earthworm gut: An ideal habitat for ingested N2O-producing microorganisms, Applied and Environmental Microbiology, 1662 - 1669, vol. 69 Read abstract

See all publications
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