Campbell-scientific Sentek EnviroSCAN EasyAG SDI-12 Manual v 3.4 Manuel d'utilisateur télécharger pdf (Page 28)

EnviroSMART & EasyAG SDI-12 Probe Manual

Appendix A – Soil Moisture Management

What soil volume does the SDI-12 probe interface measure at a

single sensor?

At a single depth level, a sensor on the probe records volumetric water content from a soil volume

outside the access tube, which has a sphere of influence of:

⇒ 10cm vertical height

⇒ 5-10cm radial distance from the outer wall of the access tube

What are the water units?

If a calibrated sensor reads one(1) millimetre, there is one(1) millimetre of volumetric water content in a

soil volume 10cm deep.

Q. What does 1mm volumetric water content / 10cm soil depth mean?

A. You require one(1) litre of water to cover one(1) square meter (m²) to a soil depth of one(1)

millimetre.

Figure 9: Measurements using metric units

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Campbell-scientific Sentek EnviroSCAN EasyAG SDI-12 Manual v 3.4 Manuel d'utilisateur Page 28