1isrInstitute for Sustainable Resources CRICOS No. 00213J
Automated Greenhouse Gas Measurement System
2isrInstitute for Sustainable Resources CRICOS No. 00213J
Basic Principle
List of Components:
A- SRI GC
B- ECD Injector 8 Port
C- FID Injector 8 port
D- Flow meter
E- Sample/ Calibration Standard Valve
F- Sample Valve on Manifold
G- ECD Detector
H- FID Detector
I - Needle Valve
3isrInstitute for Sustainable Resources CRICOS No. 00213J
Set 1
Set 3
Set 2
3 hour CycleChamber 1-4
Chamber 5-8
Chamber 9-12
N2O increase
• 3 minutes per sample
• 4 treatments
• applying 3 replicate chambers measured at 4 X 15 min intervals
• 3 ml volume of sample
Replicates
CalibrationStandard
Cycle Schematic
Start/ Restart
4isrInstitute for Sustainable Resources CRICOS No. 00213J
Sampling Unit
Sensor Inputs
Sample Ports
PLC Unit
CO2 Analyser
3 ml Sample Loops
Suction Pump
Flow Meter
Chamber Set Switches
5isrInstitute for Sustainable Resources CRICOS No. 00213J
General Overview
PLC
Embedded Computer
Actuators Sensors
Embedded computer:
• Wireless connection to outside (forwarding data to server)
• Graphical user interface for operating system
• Data logging tool
• Automated data analysis
• Trouble shooting by informing user per email
6isrInstitute for Sustainable Resources CRICOS No. 00213J
PLC (Programmable Logic Controller) as Sensor Board
• Gas chromatograph
• Soil moisture sensor
• CO2 analyser
• Rain gauge
• Pt100 temperature probes
• Flow meters • Pressure transmitters
• ...
PLC
7isrInstitute for Sustainable Resources CRICOS No. 00213J
PLC
PLC as Operator
• Suction pump
• Sample injection valve
• Sample valves
• Relays
• Pneumatic cylinders
• Electronic chambers.
•..
8isrInstitute for Sustainable Resources CRICOS No. 00213J
• High temporal resolution:
- 32 samples chamber-1 day-1: 8 flux rates day-1
• Sampled at constant and accurate intervals
• Automated data acquisition reduces human errors
• From monotonous work to research!
• Systems operate autonomous and can be controlled and checked via internet
Research is only as good as the data
9isrInstitute for Sustainable Resources CRICOS No. 00213J
User Interface
Dynamic element to show user which chamber is currently sampled
Sequence count down
10isrInstitute for Sustainable Resources CRICOS No. 00213J
Manual Control
11isrInstitute for Sustainable Resources CRICOS No. 00213J
Data Logging
12isrInstitute for Sustainable Resources CRICOS No. 00213J
Data Logging
Data logging in the back ground:
Apart from the optional items it automatically logs alarms and system status
13isrInstitute for Sustainable Resources CRICOS No. 00213J
File Name
Filename includes:
• Sensor item name• Date of log• file number in case sequencly logs are configured
Log entry as following order:
Date;Timestamp;ValueTemperature1; ValueTemperature2;ValueTemperature3
14isrInstitute for Sustainable Resources CRICOS No. 00213J
Chart Tool
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