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1 isr Institute for Sustainable Resources CRICOS No. 00213J Automated Greenhouse Gas Measurement System

1 isr Institute for Sustainable Resources CRICOS No. 00213J Automated Greenhouse Gas Measurement System

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Page 1: 1 isr Institute for Sustainable Resources CRICOS No. 00213J Automated Greenhouse Gas Measurement System

1isrInstitute for Sustainable Resources CRICOS No. 00213J

Automated Greenhouse Gas Measurement System

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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

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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

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Sampling Unit

Sensor Inputs

Sample Ports

PLC Unit

CO2 Analyser

3 ml Sample Loops

Suction Pump

Flow Meter

Chamber Set Switches

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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

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PLC (Programmable Logic Controller) as Sensor Board

• Gas chromatograph

• Soil moisture sensor

• CO2 analyser

• Rain gauge

• Pt100 temperature probes

• Flow meters • Pressure transmitters

• ...

PLC

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PLC

PLC as Operator

• Suction pump

• Sample injection valve

• Sample valves

• Relays

• Pneumatic cylinders

• Electronic chambers.

•..

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• 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

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9isrInstitute for Sustainable Resources CRICOS No. 00213J

User Interface

Dynamic element to show user which chamber is currently sampled

Sequence count down

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Manual Control

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Data Logging

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Data Logging

Data logging in the back ground:

Apart from the optional items it automatically logs alarms and system status

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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

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Chart Tool