Sentek RT6, Hardware Manual

Page: 19 / 90

CHAPTER 2: GENERAL DESCRIPTION
Page 15
EnviroSCAN Top Cap
.
The Top Cap assembly has been designed to prevent
water and dust entry to IP55 IEC 60529 standard (see
glossary). The assembly is made up of a body which
has a removable cap with "O" ring that is screwed
onto the body. The Top Cap body is glued to the top
of the access tube. Removing the screw cap enables
easy insertion and removal of the probe for repair or
re-configuration without disturbing the soil profile
surrounding the site.
The Top Cap has locaters for the probe which
minimizes translocation effects resulting from
rotating the probe in the tube following removal and
re-insertion.
A cable gland located at the bottom of the body
provides a watertight entry of the cable from the
logging facility.
The Top Cap also has a stop for the probe so that the
sensors are positioned vertically in the correct
position in relation to the soil depth being monitored.
The body automatically positions the probe so that it
locates the first sensor at 10cm depth. Location of the
first sensor at 50mm is achieved by fixing the body of
the top cap assembly onto the access tube at 50mm
from the soil surface.