Marconi TF 933C User Manual

4
SLIDING
RED
SCALE SHOWS
scm.r
ro
MOISTURE
CONTENT (120 y.)
ROOM
UMPERATURE
)
GROUNO
E
S
40
30
20
Content
Moisture
too
90
9
'2
16
22
23 2'
20
50
Batance
2
3 DIAL
READING
(2248)
2
OlAU6
TRANSFERED
TO
FIXED BLACK
SCALE
Fig.
2.3
Sequence
of reading
moisture
content
2.6
AVOIDING
ERRORS
Sampling
errors
If
several samples
are
tested from
a st-oeK
ol'
tn:tterial
the
readings
generally
will
vary
a
little.
These
variations
are
due to
local
ditTerences
in the
moisture
content
of the
bulk
and not
to
inaccuracies
in
the
instxutnent.
To get
a
representative
reading
it is
therefore
necessary
to
test
enough
satnples
to
make sure
a good
average
is obtained.
At
least
two
readings
should
be
taken.
If
these
differ,
one or
two more
should
be
taken.
For
work
of
ordinary
accuracy,
two
readings
are
usually
sufficient
if
they
differ
by
not
more
than
two
units
for
readings
up
to
•10,
one
unit
for
readings
between
40
and
50 and
half
a unit
from
50
to
55.
Between
55
and GO
the
equivalent
moisture
content
scale
contracts
_rapidly
and
readings
should
agree
within
about
0. 1
unit.
Correcting
for
sample
temperature
The
temperature
corrections
included
in
the
calibration
data
scales
or sheets
are
only
valid
the
sample
and
cell
are
at
the
same
temperature.
Although
this
will
normally
be
so,
temperature
differences
can
occur
in
situations
such
as
testing
grain
that
is
still
hot
after
passing
through
a
drying
process.
Unless
the time can
be spared
to
let the
grain
cool
down
the
reading
will
not
be
correct,
If
the
normal
scale
temper-
ature
correction
is
made
for
the
temperature
of
the
sample,
the
possible
measurement
inaccuracy
is
as
shown
below;
this
includes
the
basic
inaccuracy
of
933C
(1)
13

Marconi TF 933C Specifications

General

Brand	Marconi
Model	TF 933C
Category	Measuring Instruments
Language	English