User Manual
2.3 The Measurement Cycle
The eosFD samples gases from both the atmospheric and soil cavities within the device. The flow
diagram below breaks down the steps that the eosFD goes through to calculate flux.
When gas is being transported to and from the sensor cavity, the eosFD’s pump will be active, creating
a distinct buzzing sound. This sound is also emitted when the unit is turned on (three short pulses) or
when the eosFD accepts a command or data from the eosLink-FD software (one longer pulse).
Please note that how frequently the eosFD pump is active will depend on your measurement frequency.
For the default 10 minute setting, you will hear the eosFD alternate between long (~20 second) pump
activation and shorter (~2 second) pulses. This pattern will repeat twice per eosFD flux measurement,
with the length of silence between measurements depending on the measurement frequency setting.
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