Parr Instrument 6400, Operating Instructions Manual

Page: 53 / 110

Standardizations
6400 6
w w w . p a r r i n s t . c o m
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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% 17.1
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