Parr-instrument 6400 Manual de usuario descargar pdf (Pagina 53)

Standardizations

6400

www.parrinst.com

Table 6-3

Calorimeter Control Limit Values in BTU/lb When Benzoic Acid is Used as a Test Sample

Accepted heat of combustion taken as 11373 BTU/lb.

Instrument precision 0.10%.

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

Values are in BTU/lb.

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 34.1

2 41.9 0.261% 24.1

3 49.6 0.228% 19.7

4 53.4 0.209% 1 7. 1

5 55.9 0.196% 15.3

6 57.8 0.187% 13.9

7 59.2 0.181% 12.9

8 60.4 0.175% 12.1

9 61.3 0.171% 11. 4

10 62.2 0.167% 10.8

11 62.9 0.164% 10.3

12 63.6 0.161% 9.8

13 64.2 0.159% 9.5

14 64.8 0.156% 9.1

15 65.3 0.154% 8.8

16 65.8 0.153% 8.5

17 66.2 0.151% 8.3

18 66.6 0.150% 8.0

19 67.0 0.148% 7. 8

20 67.4 0.147% 7. 6

21 67.7 0.146% 7. 4

22 68.0 0.145% 7. 3

23 68.3 0.144% 7. 1

24 68.6 0.143% 7. 0

25 68.9 0.142% 6.8

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 109 110

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Parr-instrument 6400 Manual de usuario Pagina 53

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