GLASS PROBE THERMISTORS
FEATURES:
• SUPERIOR STABILITY
• HERMETICALLY SEALED GLASS ENCAPSULATION
• ROBUST CONSTRUCTION
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: 5 TO 21 SEC. TYP.
IN STILL AIR, DEPENDING ON TYPE
• DISSIPATION CONSTANT: 0.4 TO 1.0 mW/°C
IN STILL AIR, DEPENDING ON TYPE
• MAXIMUM OPERATING TEMPERATURE: 300°C.
• STANDARD RESISTANCE TOLERANCE: ±20%
Sensor Scientific glass probe thermistors are extremely
useful in applications that require high stability and
ruggedness. The availability of 4 standard outer diameters
offers the designer the flexibility to fit the thermistor to
the design, rather than compromising the design to
accommodate the thermistor. The SP43A style (0.043"/
1.09mm diameter) provides the small size advantages
of the industry-standard large bead (.042" /1.07mm)
thermistor without the associated handling problems.
Typical applications include fluid flow and fluid level
measurement, thermal conductivity measurement,
temperature measurement, and temperature compensation.
MECHANICAL AND THERMAL PROPERTIES
THERMISTOR TYPE
Diameter, nominal (D)
standard
standard
custom
Material: Tinned Dumet1
Diameter, nominal (d)
Length, nominal (l)
Time constant, still air
Dissipation constant, still air
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
sec.
mW/°C
SP43A
GLASS DIMENSIONS
0.043
1.09
Length, nominal (L)
0.1
2.54
----
----
none
none
LEAD WIRES
0.008
0.20
2.0
51
THERMAL PROPERTIES
5
0.4
SP60A
0.060
1.52
0.25
6.35
0.5
12.7
0.75 & 1.0
19 & 25.4
0.008
0.20
2.0
51
10
0.7
SP80A
0.080
2.03
0.25
6.35
0.5
12.7
0.75 to 2.0
19 to 50.8
0.0126
0.32
2.0
51
15
0.8
SP100A
0.100
2.54
0.25
6.35
0.5
12.7
0.75 to 2.0
19 to 50.8
0.0126
0.32
2.0
51
21
1
Note 1: Bare (not tinned) Dumet leads are available as an option
Call us toll-free at 800-524-1610 (in the US) — or check us out on the web at www.sensorsci.com
6 Kings Bridge Road - Fairfield, New Jersey 07004 • sales@sensorsci.com • Phone: (973) 227-7790 - Fax: (973) 227-8063
RESISTANCE RATIO TABLE
R
25
/R
125
Ratio
α
@ 25 Deg. C
Beta
25-125
Available
Nominal
Resistance at
25 Deg. C.
ohms
50-500
2
500-1500
1500-3500
3500-7500
7500-28000
28000-42000
42000-80000
80000-175000
175000-375000
375000-750000
750000-1250000
%/Deg. C
11.89
15.07
19.80
22.36
29.40
29.88
31.54
37.92
38.62
48.05
54.28
-3.28
-3.54
-3.88
-4.04
-4.40
-4.42
-4.49
-4.67
-4.72
-5.00
-5.15
Deg. Kelvin
2940
3220
3550
3690
4015
4035
4100
4315
4340
4600
4740
Note 2: Minimum available nominal resistance is 100 ohms for SP43A and SP60A types.
PART NUMBER SPECIFICATION:
To specify a part number, the following sequence should be used:
SP80A103201/2
specifies a glass probe thermistor, .080" (2.03mm) diameter, 10000 ohms at 25
Deg. C., with a resistance tolerance of ±20%, and nominal length of 1/2" (12.7mm)
•
SP80A103201/2
indicates glass probe thermistor
•
SP80A103201/2
indicates nominal diameter 43A = 0.043" (1.09mm) 80A = 0.080" (2.03mm) 60A = 0.060"
(1.52mm) 100A = 0.100" (2.54mm)
•
SP80A103201/2
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.
•
SP80A103201/2
indicates the resistance tolerance at 25°C, expressed in ±%. In this example, "20" indicates the
standard tolerance of ±20%. Other typical tolerances include ±1%, 2%, 5%, 10%, 15%, 20%, and 30%.
•
SP80A103201/2
indicates the nominal body length. 1/4 = 0.25" (6.4mm) 1/2 = 0.50" (12.7mm) 1/1 = 1.00"
(25.6mm) 2/1 = 2.00" (51.2mm)
(Note: The SP43A is available only in a 0.1" (2.5mm) length. The length term is omitted in the SP43A part number)
6 Kings Bridge Road - Fairfield, New Jersey 07004 • sales@sensorsci.com • Phone: (973) 227-7790 - Fax: (973) 227-8063
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