Campbell Scientific have supplied instrumentation for micrometeorological studies for many years, either complete integrated flux measurement systems or supplying data loggers and other components for integration with 3rd party equipments and sensors.

We offer both Open Path (OP) or Closed Path (CP) systems which are typically based on a CR3000 data logger capable of measuring and controlling the system at up to 20Hz scan rates (10Hz for the CPEC system), an Irgason (integrated open path gas analyser and 3D sonic anemometer) or, a CSAT3 3D sonic anemometer with either the EC150 open path or EC155 closed path gas analyser and our EC software. If you need advice or wish to discuss your requirements please contact us.

Here are some of the differences between the open and closed path systems:   

	Closed Path	Open Path
Power	Requires mains power or generator	Can be used with large solar panel
Sample measurement	Pumped into analyser (tube attenuation)	Measured in situ (no tube attenuation)
Installation	More complex installation	Less complex installation
Maintenance	Requires more maintenance	Requires less maintenance
Precipitation	Not affected by precipitation	Affected by precipitation
Measurement reference	Differential, potentially (automatic zero and span calibration routines)	Non-differential, no automatic calibration possible but regular calibration against sample gases recommended.
Cost	Generally more costly	Generally less costly