Tolerance
Thermistor Products
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BetaCURVE and
BetaCHIP product:
BetaTHERM use two
designations in specifying
tolerance of thermistor
product. These designations
are the BetaCURVE
series and the BetaCHIP
series.
BetaCURVE thermistors
are standard "interchangeable" (high
precision tolerance)
devices with tolerance
specified over
a temperature range.
To simplify ordering these
thermistors BetaTHERM supply
them in 4 temperature tolerance
classifications, A, B,
C and D.
Graphs
# 10 and # 11 represent
the thermistor
tolerance for
BetaTHERM Curve
# 3 BetaCURVE
thermistors over
the temperature
range (-80°C
to 150°C).
In
the graphic display
of the temperature
tolerance ( T) Graph
# 10, it can
be seen that the
deviation or tolerance
which is (+/-0.2°C,
from 0°C to 70°C)
for BetaCURVE material
# 3 is wider outside
the 0o C to 70°C
range.
Graph
# 11 also depicts
BetaCURVE material
# 3 with the deviation
or tolerance expressed
as a percentage
(R%)
over the range
-80°C to 150°C.
The range and tolerance
information for
all of BetaTHERM’s
material curves
is listed in the
Temperature and
Deviation Tolerance
Tables on pages
48 and 49 of
the catalog.
Temperature
Tolerance Curve (R)
for BetaTHERM
Material Curve
# 3 BetaCURVE Thermistors.
(Standard tolerance, +/-0.2°C
from 0°C to 70°C)
Graph
# 10
Percent
Tolerance Curve ( R%)
for BetaTHERM Material
Curve # 3
BetaCURVE Thermistors.
(Standard tolerance, +/-0.2°C
from 0°C to 70°C)
Graph
# 11
BetaCHIP
thermistors are
low precision
tolerance thermistors
with tolerance
specified at
a single point
temperature and
tolerance. The "worst
case" deviation
or tolerance
for temperatures
-80°C to
+300°C are
depicted in Graph
# 12 for
temperature deviation
and in Graph
# 13 for
percent deviation
from curve nominal
values for 1%,
5% and 10% @
25°C Material
Curve # 3 thermistors.
The scale of
the Graphs extends
to 300°C
to display the
tolerance for
high temperature
(glass coated
BetaCHIP and
DO-35 packaged
BetaCHIP) thermistors.
The
values displayed
in the graphs are
also listed in
the Temperature
and Deviation Tolerance
Tables on pages
48 and 49.
Temperature
Tolerance
Curve (T)
for BetaTHERM
Material
Curve # 3
BetaCHIP
(Standard
1%, 5% and
10% tolerance
@ 25°C)
Thermistors.
Graph
# 12
Percent
Tolerance Curve ( R%)
for BetaTHERM Material
Curve # 3 BetaCHIP (Standard
1%, 5% and 10%
tolerance @ 25°C
) thermistors.
Graph
# 13
Curve
Matching Accuracy
and Interchangeability:
The issue of tolerance
of components becomes important
where the interchangeability
of components is being
considered. One of the
original motivations for
having interchangeable
devices was to be able
to replace failed devices
easily. With improvements
in manufacturing techniques,
thermistor products are
now much more reliable,
so replacement is not such
a major issue.
While
replacement of
devices is still
an important consideration,
the issue of interchangeability
is presently more
likely to be concerned
with using similar
devices in individual
units of large
volume products
where thermistors
are interfaced
to a control system.
It is important
in such cases that
systems in individual
product items will
all behave in a
similar manner.
BetaTHERM’s
BetaCURVE devices
are available in
volume quantities
with curve matching
accuracy of +/-
0.2 °C over
a temperature range
from 0 °C to
+ 70 °C, which
makes them suitable
for use in high
volume production
products.
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