NTC THERMISTORS:
TYPE SP60/65/85/100
ULTRASTABLE PROBE THERMISTOR
DESCRIPTION:
The Type SP60, SP65, SP85 and SP100 ULTRASTABLE
THERMOPROBES have similar construction and dimensions
as the Type P60, P65, P85 and P100 THERMOPROBES.
ULTRASTABLE THERMOPROBES receive additional processing
to assure their continuous use in one of three (3)
Temperature Classes and are categorized into one
of six (6) Stability Groups.
APPLICATIONS:
The Type SP60, SP65, SP85 and SP100 ULTRASTABLE
THERMOPROBES may be used in all temperature measure-
ment and control applications with the added assurance of
known long term stability and reliability. They are the ideal
choice for use as secondary standards in laboratories.
DIMENSIONS:
lead-wires (see table A)
DATA:
The Temperature Class represents the maximum permissible
continuous operating or storage temperature. The Stability
Group represents the maximum drift rate, in percent resis-
tance change per year, of the thermistor when operated or
stored at all temperatures up to the maximum rating. ULTRA-
STABLE THERMOPROBES should not be exposed to tempera-
tures higher than the maximum rating as this will degrade
their stability and void the stability classification. When speci-
fied, additional preconditioning can be preformed to stabilize
units for a particular application.
.875”
(22mm)
CODING:
The code number to be ordered may be specified as follows:
SP
60
B
A
202
M
A1
Stability Ordering Code (See TABLE C for availability.)
Tolerance code letter (See NOTE 1 and TABLE B)
Zero-power resistance as 25°C (See NOTE 2)
Material System Code Letter (See TABLE C)
Probe Length Code Letter – Probes are available in three standard lengths:
“A” = .125" ± .032" / “B” = .250" ± .050" / “D” = .500" ± .063"
Nominal Probe Diameter in mils. (Specify 60, 65, 85 or 100.)
Style “SP” denotes ULTRASTABLE THERMOPROBE Type.
NOTE 1:
Special tolerances are available on request. Consult factory for special resistance tolerances, non-standard
resistances and/or non-standard temperatures.
NOTE 2:
The zero-power resistance at 25°C, expressed in Ohms, is identified by a three digit code number. The first two digits
represent significant figures, and the last digit specifies the number of zeros to follow. Example: 2k Ohms = “202”.
The standard resistance values are from the 24-Value series decade as specified in Military Standard MS90178.
1.0 / 1.1 / 1.2 / 1.3 / 1.5 / 1.6 / 1.8 / 2.0 / 2.2 / 2.4 / 2.7 / 3.0
3.3 / 3.6 / 3.9 / 4.3 / 4.7 / 5.1 / 5.6 / 6.2 / 6.8 / 7.5 / 8.2 / 9.1
BOWTHORPE THERMOMETRICS
Crown Industrial Estate, Priorswood Road
Taunton, Somerset TA2 8QY UK
Tel +44 (0) 1823 335200
Fax +44 (0) 1823 332637
THERMOMETRICS, INC.
808 US Highway 1
Edison, New Jersey 08817-4695 USA
Tel +1 (732) 287 2870
Fax +1 (732) 287 8847
KEYSTONE THERMOMETRICS CORPORATION
967 Windfall Road
St. Marys, Pennsylvania 15857-3397 USA
Tel +1 (814) 834 9140
Fax +1 (814) 781 7969
TABLE A: THERMAL AND ELECTRICAL PROPERTIES:
The following table lists the THERMAL and ELECTRICAL properties for all ULTRASTABLE THERMOPROBES.
All definitions and test methods are per MIL-PRF-23648.
THERMISTOR TYPE:
BODY DIMENSIONS:
Max. Diameter:
Standard
Lengths:
lead-wires:
Nom. Diameter:
Minimum Lead Length:
Lead Material:
Class “A”:(105°C):
Class “B” (200°C):
Class “C” (300°C):
THERMAL TIME CONSTANT:
Still Air at 25°C:
Plunge into Water:
DISSIPATION CONSTANT:
Still Air at 25°C:
Still Water at 25°C:
POWER RATING: (in air)
100% Maximum Power Rating @ 25°:
Derated to 0% @ Max. Temp.
.60 mW/°C
3.00 mW/°C
.048 Watts
See Class
.65 mW/°C
3.30 mW/°C
.052 Watts
See Class
.85 mW/°C
4.00 mW/°C
.068 Watts
See Class
1.00 mW/°C
5.00 mW/°C
.080 Watts
See Class
12 sec
300 msec
13 sec
320 msec
16 sec
400 msec
22 sec
600 msec
.008"
.875"
(.20 mm)
(22 mm)
.008"
.875"
(.20 mm)
(22 mm)
.012"
.875"
(.30 mm)
(22 mm)
.012"
.875"
(.20 mm)
(22 mm)
code “A”
code “B”
code “D”
.060"
.125"
.250"
.500"
(1.5 mm)
(3.2 mm)
(6.3 mm)
(12.7 mm)
.065"
.125"
.250"
.500"
(1.5 mm)
(3.2 mm)
(6.3 mm)
(12.7 mm)
.085"
(1.5 mm)
.100"
.125"
.250"
.500"
(1.5 mm)
(3.2 mm)
(6.3 mm)
(12.7 mm)
.125"
(3.2 mm)
.250"
(6.3 mm)
.500" (12.7 mm)
SP60
SP65
SP85
SP100
Tinned Dumet
Platinum Alloy
Platinum Alloy
Tinned Dumet
Platinum Alloy
Platinum Alloy
Tinned Dumet
Platinum Alloy
Platinum Alloy
Tinned Dumet
Platinum Alloy
Platinum Alloy
TABLE B: STANDARD TOLERANCES:
Tolerance Code Letter
± % Tolerance at 25°C
F
1
G
2
J
5
K
10
L
15
M
20
N
25
P
30
Q
40
R
50
S
Non-standard – consult factory
TABLE C: STABILITY CLASSES: (BY NOMINAL RESISTANCE AT 25°C)
ULTRASTABLE THERMOPROBE availability depends upon nominal resistance at 25°C. Stability Class is indicated by a code
letter for Temperature Class and a code number for Stability Group. Example: “A1” = .02% max. change per year at
105°C Max. Temperature.
ALL TYPES: SP60, SP65, SP85, SP100
MATERIAL SYSTEM:
CODE
LETTER
E
A
A
A
A
A
A
A
B
B
B
B
B
B
B
B
D
D
R-vs-T
CURVE
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
25/125
RATIO
5.0
11.8
12.5
14.0
16.9
19.8
22.1
22.7
29.4
30.8
32.3
35.7
38.1
45.0
48.1
56.5
75.6
81.0
Nominal
Resistance
Range @ 25°C
(Ohms)
30
51
150
360
750
1.5k
3.6k
6.2k
9.1k
27k
43k
75k
160k
360k
750k
1.5M
3.0M
8.2M
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
51
150
360
750
1.5k
3.6k
6.2k
9.1k
27k
43k
75k
160k
360k
750k
1.5M
3.0M
8.2M
20M
Temperature Class
“A” = 105°C Max.
“B” = 200°C Max.
“C” = 300°C Max.
Stability Group (resistance change)
“1” = .02% / year “4” = .1% / year
“2” = .05% / year “5” = .2% / year
“3” = .075% / year “6” = .5% / year
–
–
–
–
A1
A1
A1
A1
A1
–
–
–
–
–
–
–
–
–
Class “A”
– – – –
– A3 A4 A5
– A3 A4 A5
– A3 A4 A5
A2 A3 A4 A5
A2 A3 A4 A5
A2 A3 A4 A5
A2 A3 A4 A5
A2 A3 A4 A5
A2 A3 A4 A5
A2 A3 A4 A5
A2 A3 A4 A5
A2 A3 A4 A5
A2 A3 A4 A5
A2 A3 A4 A5
– – A4 A5
– – A4 A5
– – A4 A5
A6
A6
A6
A6
A6
A6
A6
A6
A6
A6
A6
A6
A6
A6
A6
A6
A6
A6
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Class “B”
–
–
–
–
B5
B5
B5
B5
B5
B5
B5
B5
B5
B5
B5
–
–
–
–
B6
B6
B6
B6
B6
B6
B6
B6
B6
B6
B6
B6
B6
B6
B6
B6
B6
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Class “C”
–
C6
–
C6
–
C6
–
C6
–
C6
–
C6
–
C6
–
C6
–
C6
–
C6
–
C6
–
C6
–
C6
–
C6
–
C6
–
C6
–
C6
–
C6
RESISTANCE -VS- TEMPERATURE CHARACTERISTICS: The nominal resistance range for the zero-power resistance at 25°C is shown
for each large bead-in-glass THERMOROD Type and each available Material System. Each Material System is denoted by an
ordering Code Letter, a referenced Curve number and the nominal 25°C/125°C resistance ratio.
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