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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