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Automated Greenhouse Gas Measurement System

Automated Greenhouse Gas Measurement System . 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. Cycle Schematic.

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Automated Greenhouse Gas Measurement System

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  1. Automated Greenhouse Gas Measurement System

  2. 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

  3. Cycle Schematic Start/ Restart • 3 minutes per sample • 4 treatments • applying 3 replicate chambers • measured at 4 X 15 min intervals • 3 ml volume of sample Calibration Standard Set 1 Set 3 3 hour Cycle Replicates Chamber 1-4 Chamber 5-8 Chamber 9-12 Set 2 N2O increase

  4. Sampling Unit Sensor Inputs Sample Ports Chamber Set Switches PLC Unit CO2 Analyser Flow Meter 3 ml Sample Loops Suction Pump

  5. General Overview • 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 Embedded Computer PLC Sensors Actuators

  6. PLC (Programmable Logic Controller) as Sensor Board • Gas chromatograph • Soil moisture sensor • CO2 analyser • Rain gauge • Pt100 temperature probes • Flow meters • Pressure transmitters • ... PLC

  7. PLC as Operator • Suction pump • Sample injection valve • Sample valves • Relays • Pneumatic cylinders • Electronic chambers. • .. PLC

  8. Research is only as good as the data • 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

  9. User Interface Dynamic elementto show user which chamber is currently sampled Sequence count down

  10. Manual Control

  11. Data Logging

  12. Data Logging Data logging in the back ground: Apart from the optional items it automatically logs alarms and system status

  13. 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

  14. Chart Tool

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