Parr-instrument 6300 Manual do Utilizador descarregar pdf (Página 79)

STANDARDIZATION

6300

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Table C-2

Calorimeter Control Limit Values in cal/g When Benzoic Acid is Used as a Test Sample

Accepted heat of combustion taken as 6318 cal/g.

Instrument precision 0.10%.

Control limits based on 99% confidence (3 sigma) values.

Values are in cal/g.

NUMBER OF

OBSERVATIONS

IN A GROUP

UCL FOR THE RANGE

(HIGH – LOW)

WITHIN THE GROUP

UCL FOR THE

RSD WITHIN

THE GROUP

MAXIMUM PERMISSIBLE DEVIATION

OF THE GROUP MEAN FROM THE

ACCEPTED VALUE OR GRAND MEAN

1 19.0

2 23.3 0.261% 13.4

3 27.5 0.228% 10.9

4 29.7 0.209% 9.5

5 31.1 0.196% 8.5

6 32.1 0.187% 7.7

7 32.9 0.181% 7.2

8 33.5 0.175% 6.7

9 34.1 0.171% 6.3

10 34.6 0.167% 6.0

11 35.0 0.164% 5.7

12 35.3 0.161% 5.5

13 35.7 0.159% 5.3

14 36.0 0.156% 5.1

15 36.3 0.154% 4.9

16 36.5 0.153% 4.7

17 36.8 0.151% 4.6

18 37.0 0.150% 4.5

19 37.2 0.148% 4.3

20 37.4 0.147% 4.2

21 37.6 0.146% 4.1

22 37.8 0.145% 4.0

23 37.9 0.144% 4.0

24 38.1 0.143% 3.9

25 38.3 0.142% 3.8

1 2 ... 74 75 76 77 78 79 80 81 82 83 84 ... 129 130

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