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.
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.
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 | Please note |
---|---|
Stirring sensitivity
< 2%
|
Please note
Sensors must never be exposed to N2O concentrations above their working range.
|
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.
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%
|
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
We guide you through how the sensors are made, how you can apply them as well as specifications and customizations
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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