Metalyser
®
Portable HM1000
Instruction Manual
v 5.0
Altering deposition times
The
standard
default deposition
time of 60 seconds is
suitable
for
all analysis down
to
5ppb for most
elements,
10ppb for
arsenic.
To
increase accuracy
for the lower
levels,
an
increased deposition
time is
recommended.
If the user expects the analysis to be
higher,
then a shorter
deposition
time should be used.
This
can be adjusted when
prompted to choose a
deposition
time at the
beginning
of the test methods.
30, 60 or 120 seconds can be
selected
by moving the joystick to the right and to
the
left on this
screen
and then pushing the centre of the joystick to accept it.
Deposition time
(seconds)
Concentration
range (ppb)
Suggested ranged for choosing deposition times
The instrument
has been
designed
to
have
a
maximum reading
of 500ppb. Should the
user wish to
measure higher
than this, they will need to dilute the
sample.
For
example,
if the user
wishes
to
measure
600ppb dilute the
sample
by
half
and then
multiply
the
result
by 2.
Always
dilute with water that will not contribute to the
heavy metals
being tested.
Deionised
water is ideal.
Blank subtraction
Blank subtraction is recommended
to be used for
all
of the
analyses
and
is
the
default
s
e
tt
i
n
g.
It is particularly important
for the
analysis
of Hg and As.
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