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N2O Microsensor

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

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, we can customize the N2O microsensor to your needs in relation to the range and response time. Contact us or check the Technical Data.

N2O-R 2_1400x800

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.

Characteristics
Stirring Sensitivity & Note
General info
Cables & Connectors
Characteristics
Type Tip Diameter Measuring Range Detection Limit Response Time (90%)
Type
N2O-50
Tip Diameter
40-60 µm
Measuring Range
0-200 µm
Detection Limit
0.3 µM
Response Time (90%)
< 30 sec
Type
N2O-100
Tip Diameter
90-110 µm
Measuring Range
0-200 µm
Detection Limit
0.1 µM
Response Time (90%)
< 30 sec
Type
N2O-500
Tip Diameter
400-600 µm
Measuring Range
0-200 µm
Detection Limit
0.1 µM
Response Time (90%)
< 35 sec
Type
N2O-R-LR (Low Range)
Tip Diameter
400-600 µm with cap*
Measuring Range
0-10 µm
Detection Limit
25 µM
Response Time (90%)
< 65 sec
Type
N2O-R-SR (Standard Range)
Tip Diameter
400-600 µm with cap*
Measuring Range
0-50 µm
Detection Limit
0.1 µM
Response Time (90%)
< 65 sec
Type
N2O-R-IR (Intermediate Range)
Tip Diameter
400-600 µm with cap*
Measuring Range
0-300 µm
Detection Limit
0.1 µM
Response Time (90%)
< 65 sec
Type
N2O-R-HR (High Range)
Tip Diameter
400-600 µm with cap*
Measuring Range
0-4 µm
Detection Limit
1 µM
Response Time (90%)
< 65 sec
Type
N2O-NP
Tip Diameter
1.6 x 40 mm needle for piercing
Measuring Range
0-50 µm
Detection Limit
0.1 µM
Response Time (90%)
< 65 sec
Type
N2O-FT
Tip Diameter
With glass flow cell, 6 or 8 mm OD
Measuring Range
0-50 µm
Detection Limit
0.1 µM
Response Time (90%)
< 65 sec
Type
N2O-SL
Tip Diameter
With Swagelok flow cell, 1/8” or 1/4”
Measuring Range
0-50 µm
Detection Limit
0.1 µM
Response Time (90%)
< 65 sec
Type
N2O-ST
Tip Diameter
With 1/4” x 4 cm steel tube
Measuring Range
0-50 µm
Detection Limit
0.1 µM
Response Time (90%)
< 65 sec
Type
N2O-PEEK
Tip Diameter
For 1/8” or 1/6” PEEK tube
Measuring Range
0-50 µm
Detection Limit
0.1 µM
Response Time (90%)
< 65 sec

*Stainless steel cap, 10 mm outer diameter

Stirring Sensitivity & Note
Stirring sensitivity Please note
Stirring sensitivity
< 2%
Please note
Sensors must never be exposed to N2O concentrations above their working range.
General info
Feature Standard Options Extra price for option selection
Feature
Total Length
Standard
150-200 mm
Options
70-350 mm
Extra price for option selection
20-50%
Feature
Diameter 20 mm from tip
Standard
<4 mm
Options
<2 mm
Extra price for option selection
20%
Feature
Glass shaft diameter
Standard
8 mm
Feature
Plastic shaft protection diameter*
Standard
Can be omitted
Feature
Guaranteed Lifetime
Standard
2 months
Feature
Expected Lifetime
Standard
3-4 months
Feature
Expected Lifetime N2O-R (SR/IR/HR)
Standard
4-6 months
Feature
Temperature Range
Standard
-10-50°C
Feature
Temperature Range Tip
Standard
-10-50°C
Feature
Temperature Coefficient
Standard
2-3 % per °C
Feature
Internal Reference
Standard
Yes
Feature
Internal Guard
Standard
Yes
Feature
Waterproof
Standard
Yes
Feature
Pressure compensation
Standard
No
Feature
Spatial Resolution
Standard
Equals outside tip diameter
Feature
Response
Standard
Linear
Feature
Known interferences
Standard
NO | H2S | CO2: High (millimolar range) conc. of dissolved gaseous CO2 potentially affect base line signal.

*When mounted with in situ mini connectors, the shaft has no protection mounted, but fits directly into the in situ sensor mounts with pressure compensation. In situ sensors have a standard length of 130-160 mm.

Cables & Connectors
Item Standard Options Extra Price for Option Selection
Item
Cable
Standard
Habia
Item
Cable Length
Standard
1.5-2 m
Options
0-10 m
Extra Price for Option Selection
Yes, depends on length
Item
Connector
Standard
LEMO
Options
BNC adapter
Extra Price for Option Selection
Yes, order separately
Item
In Situ Gold Pin Connector
Standard
No
Options
Yes
Extra Price for Option Selection
10%
Ordering information & Sizes
Ordering information & Sizes
Nitrous Oxide Sensor Size and description Options Extra price for option selection
Nitrous Oxide Sensor
N2O-50
Size and description
40-60 µm - glass sensor
Options
N2O-25 (25-35 µm)
Extra price for option selection
10%
Nitrous Oxide Sensor
N2O-100
Size and description
90-110 µm - glass sensor
Nitrous Oxide Sensor
N2O-500
Size and description
400-600 µm - glass sensor
Nitrous Oxide Sensor
N2O-R
Size and description
400-600 µm - with cap - glass sensor
Nitrous Oxide Sensor
N2O-LR
Size and description
400-600 µm - glass sensor - low range
Nitrous Oxide Sensor
N2O-MR
Size and description
400-600 µm - in guide
Nitrous Oxide Sensor
N2O-NP
Size and description
1.6 x 40 mm - needle sensor for piercing
Nitrous Oxide Sensor
N2O-ST-1/4
Size and description
1/4'' steel tube
Nitrous Oxide Sensor
N2O-SL-1/4
Size and description
FT-cell 1/4'' Swagelok Tee
Nitrous Oxide Sensor
N2O-SL-1/8
Size and description
FT-cell 1/8'' Swagelok Tee
Nitrous Oxide Sensor
N2O-PEEK-1/8
Size and description
FT-cell 1/8'' PEEK Tee
Nitrous Oxide Sensor
N2O-PEEK-1/16
Size and description
FT-cell 1/16'' PEEK Tee
Nitrous Oxide Sensor
N2O-FT-GLASS-6
Size and description
Glass FT-cell 6mm outer diameter
Nitrous Oxide Sensor
N2O-FT-GLASS-8
Size and description
Glass FT-cell 8mm outer diameter

Video Guides

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Quick Guide N2O Microsensors

We guide you through how the sensors are made, how you can apply them as well as specifications and customizations

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N2O Calibration Kit Video

Application Scientist Tage Dalsgaard shows you how to perform a 2-point calibration with one zero N2O and one known N2O concentration

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