TEMPERATURE ACCURACY CHECKS
The DM44
is
calibrated
to
its original temperature
probe and should be recalibrated
to
any replacement probe.
Refer
to
the DM44 Instruction Manual for calibration
procedures.
For the following accuracy checks, use an accurate
thermometer
to
verify water temperature. Anything
in
solution affects
the
melting temperature, and the boiling
point
is
affected by changes
in
altitude and barometric
pressure.
Low Temperature
1. Allow a container (preferably insulated)
of
crushed
ice
to
melt until there are only a few pieces
of
ice
remaining.
~
To
prevent possible probe
damage,
ensure
that
only
the
sealed
portion
of
the probe
is
immersed
(see
Figure
10).
2. Put the probe tip into the water, avoiding
the
sides
or
bottom
of
the container. Wait for the readout
to
stabilize, indicating
the
probe has reached the water
temperature.
3. The readout should be between
-2°
C
to
2°
C.
There
should be ice remaining after the
test
to
verify
that
inserting the probe did
not
raise
the
water tem-
perature.
High Temperature
1. Bring water
to
a slow boil (to prevent splattering).
2.
Put
the probe
tip
into
the
water, avoiding the sides
or
bottom
of
the container. Wait for
the
readout
to
stabilize, indicating
the
probe has reached the water
temperature.
3. The readout should be between 98° C and 102° C
for
fresh water
at
sea level.
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465B/DM44 Operators
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