14
*1
:
The setting of the expected flash point is changeable even during the test. After
changing in accordance with Section
3.4.1
, re-press the
START
switch. Also in this
case, the newly set expected flash point appears in the center of the display for 5
seconds.
3.4.4 Start of Ignition Source Application
After the test starts, the specimen temperature rises at a rate of 14 to 17
o
C /min(25 to 30
o
F /min).
When the temperature reaches 56
o
C (100
o
F) below the expected flash point, the heating rate is
decreased so that the rate of temperature increase during the last 28
o
C (50
o
F) before the expected
flash point is 5 to 6
o
C(9 to 11
o
F). When the temperature of the test specimen is 28
o
C(50
o
F) below
the expected flash point, the test flame begins to apply. After that, the application operation is
repeated at each 2
o
C(5
o
F).
3.4.5 Flash Detection
(1)
When the flash is detected, the observed flash point is corrected by barometric pressure and
rounded (
*2
, recorded flash point) and then starts flashing. See
Fig. 6
.
At the same time buzzer
beeps intermittently for 8 seconds. Furthermore, the solenoid valve for gas is closed, the test
flame goes out and electric pilots go off and the stove section starts cooling down. (The
COOL
lamp lights up.)
Fig. 6 Flash Point is Detected Normally
*2:
The corrected flash point (
Fc
) is computed automatically by using the following formula,
rounded to the nearest 1
o
C(2
o
F) when ASTM is selected as a test method,
rounded to the nearest 2
o
C when ISO is selected as a test method and then displayed.
For the selecting test method (ASTM or ISO), refer ACO-7 Maintenance Manual.
Fc=F+0.025(1013-P1)
where
Fc
: Corrected flash point
F
: Observed flash point
P
1
: Entered (detected) barometric pressure value (hPa).
or
Fc=F+0.06(760-P)
where
Fc
: Corrected flash point (
o
F)
F
: Observed flash point (
o
F)
P
: Entered (detected) barometric pressure value (mmHg).
ACO FLASH POINT EXP.FP
CORRECTED 270
ASTM
o
C
271.0
Flash Point (flashing)
