Sentek RT6, Hardware Manual

Page: 20 / 90

SENTEK
Page 16
After installation of the access tube, bottom stopper
and top cap (see the Access Tube Installation
Manual), the probe is lowered into this tube.
Readings of soil water content are taken through the
PVC access tube without any contact between the
sensor and the soil. The bottom of the access tube is
sealed with a watertight bottom stopper to protect the
probe from entry of water.
EnviroSCAN Sensors
The sensor consists of a tubular housing with two
brass rings. The electronic circuit contained within
this housing plugs into a ribbon cable running along
the extruded support rod which supports the
sensors. This support rod can be fitted with
multiple sensors (up to 16), located at 100mm
intervals along its length.
The sensors slide onto the extrusion at the desired
depth. The sensors may be replaced in the field. No
gluing or soldering is necessary. A link is provided
on each sensor to enable it to be easily addressed
and re-addressed.
The sensors can be mounted on the support rod at
depth intervals to suit a variety of crops and soil
variability (see Appendix C). Each configuration of
multiple sensors on the support rod is called a
"probe".
The sensors/probe are lowered into a 50mm plastic
access tube which is vertically installed in the soil
and sealed at the top (with a screwed top cap) and
bottom (with an expandable bung).