THE BROWX-DUVEL MOISTURE TESTES 
31 
COMPARTMENT 
COVERS REMOVED 
AFTER TESTS 
COOLED TO 160° ( 
(THERMOMETER 
READING 160° C) 
Correct Cooling Time, 
and. 
Correct Moisture Test Result 
frnoofrT. h,u.J^iiii;i i i;wiii»;;;,„..,.„..„,.,..,,„; 
J time f:: :./.^^^.^.::::::::::::;;::::::;;:::;::; 
correct nmmniPB 
[test ; 
10 MINUTES AFTER 
CUT-OFF TEMPERATURE 
WAS REACHED 
(THERMOMETER 
READING 180° C) 
5 MINUTES AFTER 
CUT-OFF TEMPERATURE 
WAS REACHED 
(THERMOMETER 
READING I86°C) 
IMMEDIATELY AFTER 
CUT-OFF TEMPERATURE 
WAS REACHED 
(THERMOMETER 
READING 190° C) 
VARIATION 7 
J 2 7 /i2 MIN. £ 
) ERROR 
[-0.4% 
I VARIATION 
J-IO MIN. 
ERROR 
\-0.Q7o 
5 minutes 
16.75% moisture 
t.'*«."3 Cooling Time | Moisture Test Result 
Fig. 23. — Effect of cooling time ou the moisture-test result 
PRIMIXG TESTS 
In making a moisture test with the Brown-Duvel tester, all of the 
moisture which is distilled from the grain is not obtained in the grad- 
uate during the first test with a new flask. Some of it stays behind 
on the walls of the glassware. To accomplish accurate results, it is 
therefore necessary to make a preliminary or priming test in all the 
compartments of a new moisture tester, or when new distillation 
flasks are used, before a regular test is made. This is also true when 
a machine has been standing idle or standing open for any appreci- 
able length of time. The length of time a tester may stand idle, after 
which it will be necessary to make a priming test before the regular 
test is made, depends somewhat upon the state of the machine when 
not in use. 
The data, which are summarized in Tables 8 and 9, and shown 
graphically in Figures 24 and 25, show that a failure to make a 
15.9% Moisture 
CONNECTIONS 
CLOSED 
BUT 
NO 
PRIMING 
TEST 
MADE 
PRIMING TEST I CORRECT 
MADE I TEST 
CORRECT METHOD ' (CHECK) 
1 
TESTER STANDING i ERROR 
2 HOURS \ -0.02% 
TESTER STANDING I ERROR 
5 HOURS '-0-14% 
TESTER STANDING i ERROR 
20 HOURS ] -0.20% 
TESTER STANDING ! ERROR 
40 HOURS i -0.29% 
\\\l 6.4-8% moisture \XXXXXXXXXXXXXXXll 
16.33% moisture 
15.9% Moisture 
Fig. 24. — Necessity of making- a priming test before making moisture test a 
the moisture tester, with all connections closed, has been standing idle 
any appreciable length of time is here shown 
fter 
for 
