3

Stability Classes (By Nominal Resistance at 77°F (25°C)

Ultra-stable probe thermistors availability depends upon nominal resistance at 77°F (25°C). Stability class is

indicated by a code letter for temperature class and a code number for stability group.

Example: “A1” = .02% maximum change per year at 221°F (105°C) maximum temperature.

Table B

Material System (All Types 60/65/85/100)

Code

Letter

R-vs-T

Curve

25/125

Ratio

Nominal Resistance

Range @ 77°F (25°C) Ohms

(W)

Code Class “A”

221°F (105°C)

maximum

Class “B”

392°F (200°C)

maximum

Class “C”

572°F (300°C)

maximum

E

0

5.0

30 to 51

–

–

–

–

–

A6

–

–

–

–

–

C6

A

1

11.8

51 to 150

–

–

A3

A4

A5

A6

–

–

B6

–

–

C6

A

2

12.5

150 to 360

–

–

A3

A4

A5

A6

–

–

B6

–

–

C6

A

3

14.0

360 to 750

–

–

A3

A4

A5

A6

–

–

B6

–

–

C6

A

4

16.9

750 to 1.5k

A1

A2

A3

A4 A5

A6

–

B5

B6

–

–

C6

A

5

19.8

1.5k to 3.6k

A1

A2

A3

A4 A5

A6

–

B5

B6

–

–

C6

A

6

22.1

3.6k to 6.2k

A1

A2

A3

A4 A5

A6

–

B5

B6

–

–

C6

A

7

22.7

6.2k to 9.1k

A1

A2

A3

A4 A5

A6

–

B5

B6

–

–

C6

B

8

29.4

9.1k to 27k

A1

A2

A3

A4 A5

A6

–

B5

B6

–

–

C6

B

9

30.8

27k to 43k

–

A2

A3

A4 A5

A6

–

B5

B6

–

–

C6

B

10

32.3

43k to 75k

–

A2

A3

A4 A5

A6

–

B5

B6

–

–

C6

B

11

35.7

75k to 160k

–

A2

A3

A4 A5

A6

–

B5

B6

–

–

C6

B

12

38.1

160k to 360k

–

A2

A3

A4 A5

A6

–

B5

B6

–

–

C6

B

13

45.0

360k to 750k

–

A2

A3

A4 A5

A6

–

B5

B6

–

–

C6

B

14

48.1

750k to 1.5M

–

A2

A3

A4 A5

A6

–

B5

B6

–

–

C6

B

15

56.5

1.5M to 3.0M

–

–

–

A4 A5

A6

–

–

B6

–

–

C6

D

16

75.6

3.0M to 8.2M

–

–

–

A4 A5

A6

–

–

B6

–

–

C6

D

17

81.0

8.2M to 20M

–

–

–

A4 A5

A6

–

–

B6

–

–

C6

“1” = 0.02%/year

“2” = 0.05%/year

“3” = 0.075%/year

“4” = 0.1%/year

“5” = 0.2%/year

“6” = 0.5%/year