Table 6-2, Acid is used as a test sample, Standardizations – Parr Instrument 6400 User Manual
Page 52
6
Standardizations
P a r r I n s t r u m e n t C o m p a n y
50
Table 6-2
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
0.145%
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