A portable measurement system for measuring soil N₂O and CO flux emissions using the gas chamber method.

In soil, nitrogen (N₂O ) is produced by nitrifying and denitrifying microorganisms. When excessive nitrogen fertilizer is applied to farmland, it promotes microbial activity, converting nitrogen into N₂O through nitrification and denitrification . N₂O has a long residence time in the atmosphere and can be transported to the stratosphere, leading to ozone layer depletion and ozone holes. This exposes humans and other organisms to ultraviolet radiation from the sun, causing damage to human skin, eyes, and the immune system.
Among the various air pollutants emitted by industry, CO is the main one. These pollutants will fall into the soil through precipitation and natural sedimentation, reducing the land's productivity, deteriorating product quality, and causing serious harm to humans, animals, and plants.
The PS-3020 Portable Soil Nitrous Oxide/Carbon Monoxide Flux Measurement System is a portable measurement system that uses the gas chamber method to measure soil N₂O and CO flux emissions. The system includes control measurement, storage, and data processing functions.
The PS-3020 can read the concentration changes of N₂O and CO in the breathing chamber in real time. Simultaneously, it combines monitoring data from sensors such as air temperature, atmospheric pressure, and soil temperature to calculate the N₂O and CO emission flux values. The acquired raw data and calculated flux results are stored on an SD card.
The SC-12 portable soil breathing chamber enables automatic and repeated measurements. Lightweight and easy to carry and operate in the field, the SC-12 features a unique design for more accurate measurements.
The PS-3020 achieves wireless communication via a mobile app, allowing users to set various measurement parameters in real time and display the instrument's measurement results.

System features:
■ The analyzer measures the concentrations of N₂O, CO, and H₂O in real time with high precision ;
■  Measurement interval < 5 seconds, typical value 2.7 seconds;
■ Simple to operate, results can be obtained with one click;
■ No data post-processing is required; measurement results are displayed and stored directly.

Performance metrics:

◆ Analyzer: G5310 Gas Concentration Analyzer
Simultaneous measurement of three gases ( N₂O , CO, and H₂O )
Accuracy (1σ, 5 seconds):
N₂O : < 0.2 (N₂O < 500 ppb) Typical value = 0.10 ppb*
CO: < 0.2 (CO < 400 ppb) Typical value = 0.13 ppb*
H₂O : < 40 ppm
Accuracy (1σ, 5 minutes):
N₂O : < 0.04 ppb (N₂O < 500 ppb) Typical value = 0.015 ppb*
CO: < 0.04 ppb (CO < 400 ppb) Typical value = 0.019 ppb*
H₂O : < 6 ppm
Accuracy (1σ, 1 hour):
N 2 O: < 0.02 ppb (N 2 O < 500 ppb)
CO: < 0.02 ppb (CO < 400 ppb)
Accuracy (1σ, 5 minutes):
N₂O : 0.03% N₂O reading (N₂O > 500 ppb)
CO: CO reading of 0.02% (CO > 400 ppb)
H₂O : < 6 ppm

Measurement range:

N₂O : 1–1500 ppb
CO: 1–1500 ppb
H₂O : 0–3%

Environmental conditions:

Sample temperature: -10 to 45 ℃
Ambient temperature: 15 to 35℃ (operating conditions); -10 to 50℃ (storage conditions)
Ambient humidity: < 85% relative humidity, under non-condensing conditions
Sample flow rate: 100 standard milliliters per minute
Measurement interval: < 5 seconds. Typical value = 2.7 seconds.
Data outputs: RS-232 interface, network interface, USB interface

Size and weight:

17 inches wide x 12.5 inches high x 20.5 inches long (43.2 x 31.7 x 52.1 cm, excluding 0.5-inch feet), 95 lbs (43 kg), including built-in pump.

◆ PS-3020 Control System

Display: 5-inch touchscreen or Android mobile app
Microprocessor: ARM Cortex-M3
Storage medium: SD card
Communication interfaces: RS-232, SDI-12, UART, WIFI
Synchronous pump: 12 V, 1.5 A, flow rate: 3 L/min
Battery type: 20 AH or 10 AH lithium battery (depending on the analyzer type)
Battery life: 3-4 hours (per battery)
Weight: 3 KG

◆ SC-12 Portable Soil Breathing Chamber

Measured area: 298.5 ( cm² )
Fixed volume of the air chamber: 3341 ( cm³ )
Cable length: 1 m
Barometric pressure measurement:
Measurement range: 15 ~ 115 kPa, Measurement accuracy: ±1.5%
Temperature detection:
Measurement range: -25 ~ 85 ℃, Measurement accuracy: ±0.5 ℃
Dimensions: 265 (D) x 430 (H) mm
Weight: 3.5 kg