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