Parr Instrument 6100 - Manual (Page 57)

Standardization
6100 C
w w w . p a r r i n s t . c o m 55
Table C-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 0.20%.
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 68.2
2 83.9 0.521% 48.3
3 99.1 0.455% 39.4
4 106.9 0.418% 34.1
5 111.9 0.393% 30.5
6 115.5 0.375% 27.9
7 118.3 0.361% 25.8
8 120.7 0.350% 24.1
9 122.7 0.341% 22.7
10 124.4 0.334% 21.6
11 125.9 0.327% 20.6
12 127.2 0.322% 19.7
13 128.4 0.317% 18.9
14 129.6 0.313% 18.2
15 130.6 0.309% 17.6
16 131.5 0.305% 17.1
17 132.4 0.302% 16.6
18 133.2 0.299% 16.1
19 133.9 0.297% 15.7
20 134.7 0.294% 15.3
21 135.3 0.292% 14.9
22 136.0 0.290% 14.5
23 136.6 0.288% 14.2
24 137.2 0.286% 13.9
25 137.7 0.284% 13.6