SMALL BEAD THERMISTORS
FEATURES:
•
SUPERIOR STABILITY
•
VERY FAST RESPONSE TIME
•
LOW THERMAL MASS
OPTIONS:
•
CUSTOM LEAD LENGTHS
•
NON-STANDARD RESISTANCE TOLERANCES
•
NON-STANDARD RESISTANCE VALUES
•
PRECISION CALIBRATION AT MULTIPLE
•
TEMPERATURES
CUSTOM VALUE-ADDED ASSEMBLY OPTIONS
SPECIFICATIONS:
•
TIME CONSTANT: 1 SEC. TYP. IN STILL AIR
•
DISSIPATION CONSTANT: 0.1mW/°C IN STILL AIR
•
MAXIMUM OPERATING TEMPERATURE: 300°C.
•
STANDARD RESISTANCE TOLERANCE: ±25%
Sensor Scientific small bead thermistors
offer the advantages of small size and
mass, very fast thermal response time,
extreme sensitivity to current and volt-
age changes, and high stability. Typical
applications include thermodilution car-
diac catheters and other biomedical
assemblies, fluid flow and fluid level
measurement, thermal conductivity
measurement, gas analysis, and small
surface area temperature measurment.
SMALL BEAD THERMISTORS
MECHANICAL AND THERMAL PROPERTIES
B O DY DI MEN S I O N S
inches
mm
inches
mm
LEAD WIRES
Material: Platinum Alloy
inches
mm
inches
mm
THERMAL PROPERTIES
sec.
mW/°C
Diameter, nominal
Length, nominal
0.014
0.36
0.02
0.5
0.0011
0.028
0.375
9.5
1
0.1
Diameter, nominal
Length, minimum
Time constant, still air
Dissipation constant, still air
Call us toll-free at 800-524-1610 (in the US) — or check us out on the web at www.sensorsci.com
Sensor Scientific, Inc.
• 6 Kings Bridge Road - Fairfield, New Jersey 07004 • Phone: (973) 227-7790 • Fax: (973) 227-8063
eMail: sales@sensorsci.com • web: www.sensorsci.com
Sensor Scientific, Inc.
RESISTANCE RATIO TABLE
Resistance at
25 Deg. C.1
ohms
1000
2500
5000
10000
25000
50000
100000
Beta25-125
R25/R125
α
at
25 Deg. C.2
%/°C
-3.33%
-3.48%
-3.71%
-3.88%
-3.88%
-4.04%
-4.40%
Part Number3
Deg. Kelvin
3000
3090
3385
3550
3550
3690
4015
Ratio
12.5
13.5
17.3
19.8
19.8
22.4
29.4
Adjacent Leads
S14A10225
S14A25225
S14A50225
S14A10325
S14A25325
S14A50325
S14A10425
Opposite Leads
S14B10225
S14B25225
S14B50225
S14B10325
S14B25325
S14B50325
S14B10425
Note 1: The listed resistance values are a representative sample only. Other resistance values are available upon
request.
Note 2: Alpha values are for reference only. Actual values are dependent upon specific resistance at 25 Deg. C.
Note 3: The listed part numbers indicate the standard resistance tolerance of ±25% at 25 Deg. C. To specify a
different tolerance, replace the "25" characters at the end of the part number with "01" for
"1%, "10" for "10%, etc.
PART NUMBER SPECIFICATION:
To specify a part number, the following sequence should be used:
S14A10325 specifies a small bead thermistor with adjacent leads, 10000 ohms at 25 Deg. C.,
with a resistance tolerance of ±25%.
•
S14A10325
indicates small bead thermistor, .014" (0.36mm) nominal diameter
•
S14A10325
indicates lead configuration A: Adjacent leads B: Opposite leads
•
S14A10325
indicates zero power resistance at 25°C. The first two digits indicate significant figures, and the
last digit indicates the number of zeros following the significant figures. In this example, "103" represents 10000
ohms.
•
S14A10325
indicates the resistance tolerance at 25°C, expressed in ±%. In this example, "25" indicates the
standard tolerance of ±25%. Other typical tolerances include ±1%, 2%, 5%, 10%, 15%, 20%, and 30%.
Sensor Scientific, Inc.
• 6 Kings Bridge Road - Fairfield, New Jersey 07004 • Phone: (973) 227-7790 • Fax: (973) 227-8063
eMail: sales@sensorsci.com • web: www.sensorsci.com
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