Parr Instrument 6400 - Manual (Page 51)

Standardizations
6400 6
w w w . p a r r i n s t . c o m 49
Any outliers or other tests which should not be
included in the average EE Value must be deleted
from the memory using the memory management
procedures (see Chapter 8). A list of all tests associ-
ated with any Cal ID can be printed from the Calibra-
tion Data Page using Print Standardization Runs.
The user can elect to have any number of stored
standardization runs used in determining the EE
value by entering this number on Calibration Data &
Controls Page - Calibration Run Limit.
EE Max Std Deviation on this same page establishes
the maximum allowable standard deviation for the
EE Value before an error condition is reported. The
default value is zero which turns off this limit. But
the user should enter a value appropriate for the
test being made.
Table 6-1
Calorimeter Control Limit Values in J/g When Benzoic Acid is Used as a Test Sample
Accepted heat of combustion taken as 26454 J/g.
Instrument precision 0.10%.
Control limits based on 99% confidence (3 sigma) values.
Values are in J/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 79.4
2 97.5 0.261% 56.1
3 115.3 0.228% 45.8
4 124.3 0.209% 39.7
5 130.1 0.196% 35.5
6 134.3 0.187% 32.4
7 137.6 0.181% 30.0
8 140.4 0.175% 28.1
9 142.7 0.171% 26.5
10 144.7 0.167% 25.1
11 146.4 0.164% 23.9
12 147.9 0.161% 22.9
13 149.4 0.159% 22.0
14 150.7 0.156% 21.2
15 151.8 0.154% 20.5
16 153.0 0.151% 19.8
17 154.0 0.151% 19.2
18 154.9 0.150% 18.7
19 155.8 0.148% 18.2
20 156.7 0.147% 17.7
21 157.4 0.146% 17.3
22 158.2 0.145% 16.9
23 158.9 0.144% 16.5
24 159.5 0.143% 16.2
25 160.2 0.142% 15.9