Soil Oxygen Sensor

Soil Oxygen Sensor MIJ-03

Features

・Can be used for long term observation with easy set-up. 

・Automatic temperature compensation. 

・No influence by the rain or other waters. 

・Easy span calibration. 

・Not require to do the zero calibration. 0% Oxygen = 0 mV output.

Difference between dissolved oxygen sensor and soil oxygen sensor MIJ-03

Dissolved oxygen Sensor:
Sensor that measures oxygen dissolved in water. The normal measurement range excluding supersaturation is 20mg/L measured in ppb units.
In the case of permanent installation, be careful of electrode contamination.

Soil oxygen sensor MIJ-03:
Since soil is rarely flooded, an soil oxygen sensor MIJ-03 developed to solve the problem that the dissolved oxygen sensor cannot measure for long term measurement because dissolved oxygen sensor need water to measure oxygen. Since MIJ-03 structure does not care for direct contact between the electrodes and the soil so no maintenance need and permanent installation is possible. The normal measurement range is 0 to 20.9%. Soil oxygen can never be higher than 20.9% of atmospheric oxygen. As a special case, rice field have a period of both  flooding and drainage so both dissolved oxygen sensor and soil oxygen sensor MIJ-03 are often use together for this particular field.

Soil Oxygen Sensor MIJ-03 

MIJ-03 developed by our company Environmental Measurement Japan in April 2006. MIJ-03 soil oxygen sensor is used for the measurement of the root aspiration. MIJ-03 detects the density of oxygen in the soil by % order without any difficulties, it simply digs up the hole in the soil and lay this sensor into the ground. An usual usage of this sensor is laid in a vertical direction at intervals of 20 to 50 cm. Researchers can measure the vertical profile of the O2 in the soil.

Why we recommend our MIJ-03?

Soil Oxygen Sensor MIJ-03 is built from a rigid thermoplastic, that allows long-term stability in most environmental conditions; thus it’s life time is maximum about 10 years.

Most users are not willing to maintenance the sensors; MIJ-03  is friendly to those users because it need only minimum maintenance. Once the sensor is installed in the soil, you do not need to care about maintenance.

MIJ-03 can be connected to EMJ data logger MIJ-12 or MIJ-01. If you have your own data logger you may be able to connect MIJ-03; this is because it has a voltage output that can be supported by any compatible data logging system. 

Figure 1.
Measured oxygen and pF at same time.
Although there are fluctuations due to irrigation, it is interesting that it is not rapid.

Figure 2.
Data at north area of Hokkaido (Measurements of O2、CO2、PAR)

Specification

Theory Galvanic Battery + Porous membrane sheet
Shape   40mm, Length 78 mm
(Cable support joint  is 50mm height extra.)
Output   45 – 65mV at 20.9%O2
(Users must check the output at the air before set-up)
Weight 220g(Including cable)
Cable Length 5m (+/White, -/Black,  Shield cable)
Temperature Effect At R.H. 100 % and O2 20.9%.
Sensor out put is 20.8% at 5, 19.4% at 40degree.  
                                 
At R.H. 0% and O2 20.9%.
It is not influence from the temperature effect
Temperature 0~40℃

References

Dry Cover Method to Prevent Acid Mine Drainage Generation in Coal Mine Site: Oxygen and Water Behavior Field Measurement
大豆作圃場での土中水分・酸素濃度の降雨応答 (Observed response of soil moisture and O2 concentration to rainfall events in a soybean field)
土中に敷設された廃棄物最終処分場キャッピング用複合シートのガス透過性実証実験 (Gas Permeability of Hybrid Geosynthetics for Landfill Cap Cover Installed in the Underground)
ガス透過性防水シートの適応に関する検討
自然的原因による重金属汚染の対策技術の開発
ガス透過性無粋シートの開発と除染廃棄物仮置場への適用 Development of Gas-permeable/Waterproof Sheet and Its Application to temporary Storage Site for Decontaminated Waste
低圃場負荷地下かんがい・排水システムの開発
Dry Cover Method to Prevent Acid Mine Drainage Generation in coal Mine Site: Oxygen and Water Behavior Field Measurement
Relationship Between Short-Term Compression Strength and Transmissivity Properties of Geonets
Comparative field experiment on gas permeability of cover sheets for temporary storage sites of decontamination waste
Effects of Additional Layer(s) on the Mobility of Arsenic from Hydrothermally Altered Rock in Laboratory Column Experiments
Appendix O NOEF Closure Monitoring System Report
Effects of application of lime nitrogen and dicyandiamide on nitrous oxide emissions from green tea fields
Capabilities and limitations if DGGE for the analysis of hydrocarbonoclastic prokartyotic communities directly in environmental samples