Introduction; Description - Delta-T Devices PR2 User Manual

Introduction

Description

The Profile Probe measures soil moisture content at different
depths within the soil profile. It consists of a sealed
polycarbonate rod, ~25mm diameter, with electronic sensors
(seen as pairs of stainless steel rings) arranged at fixed intervals
along its length.
When taking a reading, the probe is inserted into an access
tube. The access tubes are specially constructed thin-wall
tubes, which maximise the penetration of the electromagnetic
field into the surrounding soil.
The output from each sensor is a simple analogue dc voltage.
These outputs are easily converted into soil moisture using the
supplied general soil calibrations or the probe can be calibrated
for specific soils.
Advantages
4 Introduction
The Profile Probe is dual-purpose
each probe can be used both for portable readings from
many access tubes and for installation within one access
tube for long-term monitoring.
Fully sealed and robust.
High accuracy: ±4%.
Easy installation with minimal soil disturbance.
Large sampling volume ~ 1.0 litres at each profile depth.
Simple analogue output, 0 to ~1.0 V
Works reliably even in saline soils.
olts
Profile Probe User Manual 3.0a