Calorimeter Control Limit Values In Cal/G When Benzoic Acid Is Used As A Test Sample - Parr Instrument 6400 Operating Instructions Manual

6
Standardizations
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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
50
P a r r I n s t r u m e n t C o m p a n y

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

UCL FOR THE RANGE
(HIGH – LOW) WITHIN
THE GROUP
23.3
27.5
29.7
31.1
32.1
32.9
33.5
34.1
34.6
35.0
35.3
35.7
36.0
36.3
36.5
36.8
37.0
37.2
37.4
37.6
37.8
37.9
38.1
38.3
Table 6-2
UCL FOR THE
DEVIATION OF THE GROUP MEAN
RSD WITHIN
FROM THE ACCEPTED VALUE OR
THE GROUP
0.261%
0.228%
0.209%
0.196%
0.187%
0.181%
0.175%
0.171%
0.167%
0.164%
0.161%
0.159%
0.156%
0.154%
0.153%
0.151%
0.150%
0.148%
0.147%
0.145%
0.145%
0.144%
0.143%
0.142%
MAXIMUM PERMISSIBLE
GRAND MEAN
19.0
13.4
10.9
9.5
8.5
7.7
7.2
6.7
6.3
6.0
5.7
5.5
5.3
5.1
4.9
4.7
4.6
4.5
4.3
4.2
4.1
4.0
4.0
3.9
3.8