THE BBOWN-DUVEL MOISTURE TESTER 
31 
COMPARTMENT 
COVERS REMOVED 
AFTER TESTS 
COOLED TO 160° < 
(THERMOMETER 
READING 160° C.) 
10 MINUTES AFTER 
CUT-OFF TEMPERATURE 
WAS REACHED 
(THERMOMETER 
READING 180° C.) 
5 MINUTES AFTER 
Correct Coo Zing Time 
and. 
Correct Moisture Test Result 
VARIATION 
|-I 3 /*MIN. 
ERROR 
-0.3% 
%li \l6'/z minutes ""££?"»""""«""j 
^2!,^^".^^^'r^\^^^,r.'..v:.*.'iM.*. : ',r,.'/,^,^,*:,:. , .v.v.l 
WAS REACHED ^ /E 
CTHERMOMETER I ERROR 
READING 186° C.) 
IMMEDIATELY AFTER 
CUT-OFF TEMPERATURE 
WAS REACHED 
(THERMOMETER 
READING 190° C) 
5 minutes 
i 6.75% moisture 
|»««««| Cooling Time |§ Moisture Test Result 
Fig. 23. — Effect of cooling time on the moisture-test result 
PRIMING 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 
1 5.9% Moisture 
PRIMING TEST 
MADE 
CORRECT METHOD 
CONNECTIONS 
CLOSED 
BUT 
NO 
PRIMING 
TEST 
MADE 
TESTER STANDING 
2 HOURS 
TESTER ST^NPING 
5 HOURS 
TESTER STANDING 
20 HOURS 
TESTER STANDING 
40 HOURS 
ERROR 
-0.14% 
ERROR 
-0.29% 
1/6.4-8% moisture \\\\\XX\\Xi\\X\X\\ 
16.33% moisture 
15.9% Moisture 
Fig. 24. — Necessity of making a priming test before making- moisture test after 
the moisture tester, with all connections closed, has been standing- idle for 
any appreciable length of time is here shown 
