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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:

202

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

Tinned Dumet

Platinum Alloy

Tinned Dumet

Platinum Alloy

Tinned Dumet

Platinum Alloy

TABLE B: STANDARD TOLERANCES:

Tolerance Code Letter

± % Tolerance at 25°C

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

R-vs-T

CURVE

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)

150

360

750

1.5k

3.6k

6.2k

9.1k

27k

43k

75k

160k

360k

750k

1.5M

3.0M

8.2M

–

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

–

Class “A”

– – – –

– A3 A4 A5

A2 A3 A4 A5

– – A4 A5

–

Class “B”

–

Class “C”

–

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.