Marconi TF 933C User Manual

Chapter
Operation
2.1
INSTALLATION
NOTE
The
performance
of this
instrument
may
be
impaired
by
lengthy
exposure
to
a
damp
atmosphere.
Drying
for a
short
period
in
a
warm
dry
atmosphere
will
restore
it to
give
normal
performance.
Ensure
that
the
instrument
is
switched
OFF
before
connecting
any
leads
and
only
switched
on
when
actually
taking
measurements,
hence
prolonging
the
life
of
the
batteries.
2.2
CONTROLS
AND
CONNECTIONS
Balance controls
The electrical
principle employed in the instrument is the variation of
conductivity
of the specimen with moisture
content. Conductivity
is measured by adjusting the
coarse and fine BALANCE controls to give a standard meter indication; the
reading on
the controls
is then easily converted
into moisture
content by
reference to the scale on
the
instrument or to a chart supplied with
it.
In
addition to
the two BALANCE controls there
is
a
rotary switch marked OFF-
ZERO-READ
and a red ZERO knob for standardizing
the instrument before taking
a
measurement.
NOTE:
If
either
of the
BALANCE
controls becomes
loose
it
must not be
secured
without
first
carrying out the
standardization test detailed
in Sect. 4.2.
Electrode
connections
•me
compression cell electrode
is normally stowed in the lower
front
compart—
of the
moisture
meter. Also
inside this
compartmelt
are
three sockets
labelled
RED,
GREEN
and
BLACK.
Connect the
RED and BLACK sockets on the
8
93.w

Marconi TF 933C Specifications

General

Brand	Marconi
Model	TF 933C
Category	Measuring Instruments
Language	English