Acid is used as a test sample, Standardization – Parr Instrument 6100 User Manual
Page 56
C
Standardization
P a r r I n s t r u m e n t C o m p a n y
54
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 0.20%.
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
37.9
2
46.6
0.521%
26.8
3
55.1
0.455%
21.9
4
59.4
0.418%
19.0
5
62.1
0.393%
17.0
6
64.2
0.375%
15.5
7
65.7
0.361%
14.3
8
67.1
0.350%
13.4
9
68.2
0.341%
12.6
10
69.1
0.334%
12.0
11
69.9
0.327%
11.4
12
70.7
0.322%
10.9
13
71.3
0.317%
10.5
14
72.0
0.313%
10.1
15
72.5
0.309%
9.8
16
73.1
0.305%
9.5
17
73.5
0.302%
9.2
18
74.0
0.299%
8.9
19
74.4
0.297%
8.7
20
74.8
0.294%
8.5
21
75.2
0.292%
8.3
22
75.6
0.290%
8.1
23
75.9
0.288%
7.9
24
76.2
0.286%
7.7
25
76.5
0.284%
7.6