Diviner 2000 access tubes

[Jac le Roux <jac@besproeiing.co.za>]

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I recently acquired a Diviner2000 moisture probe. The supplier installs the
access tubes by drilling a hole of 10mm  bigger OD, inserts the PVC tube and
settles it in with a clay mixture (similar to potters clay - the exact
compostion I am not sure of), to ensure perfect contact between tube and
soil.

We work with sand (as in sand dunes) with moisture holding capacity as low
as 45 mm/m.

I am wondering what the effect of the clay band in direct contact with the
tube could be.
Can I assume that the sand-clay will reach equilibrium, in a short enough
time to give me the correct response.

Your comments will be appreciated.

Thank you: Jac le Roux
jac@besproeiing.co.za