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Gilson Company, Inc.
7.4 Shutting Down the Furnace
When the furnace is not in the middle of a test and the
main chamber is at the preheat temperature with PRHT/
Main Chamber Temperature flashing on the display, open
the door and leave it slightly ajar. Press <STOP>. The
display will flash between AbRT, the temperature when
<STOP> was pressed and the current temperature. The
bottom red pilot light will be off, indicating that the main
chamber elements are off. The fan will continue to run
and the Afterburner elements will cycle to maintain tem-
perature in the Afterburner. The door-lock push button will
be disabled. The furnace will remain in this state until the
main chamber temperature cools to 350°C. The process
may be accelerated by fully opening the door. Once
the main chamber temperature is below 350°C, press
<ANY> key and IdLE will be displayed. The Afterburner
elements will be shut off as evidenced by the upper red
pilot light and the door-lock push button will be enabled
again. Once the Afterburner temperature falls below Cfn
set point, the fan will shut off. At this point, the furnace
can be switched off.
7.5 Aborting a Test
•
DO NOT push <CONTINUE> until the furnace has
been properly preheated and the sample with all parts
of the Basket, Tray and Cover assembly are in the
chamber. Once <CONTINUE> has been pressed,
the door lockout makes it time consuming to abort a
test, and the furnace will need to be preheated again
once the abort procedure is completed.
•
To abort a test after <CONTINUE> has been pressed,
press <STOP>. COdE displays. The operator must
then enter the Code "31" within 3 to 4 seconds and
press <ENTER>. AbRT/XXXX (main chamber tem-
perature) is then displayed. Press <ANY> key and
the furnace shuts down.
•
The door lock does NOT release until the chamber
cools to less than 300°C. Press <ANY> key to begin
display of chamber temperature.
•
To abort BEFORE <CONTINUE> has been pressed,
press <STOP>. The display shows AbRT/XXXX (main
chamber temperature). Then press <ANY> key and
the display will show IdLE/XXXX (main chamber
temperature). The furnace is now shut down.
8.0 CUSTOM APPLICATIONS
The Gilson HM-378 is designed for asphalt binder igni-
tion tests of asphaltic hot-mix to determine binder content
percentage in the mix. Refer to and follow instructions
for that procedure as described in Section 7.0. While the
programming procedure described in Section 8.2 has
been found to be adequate, the user should recognize
that a more complicated program is possible, involving a
series of temperature ramps and dwells.
8.1 Ramp-Hold Programming
The controller of the HM-378 has wider capabilities than
believed necessary for binder ignition work. In addition to
storing ten binder ignition programs as outlined in Section
7.2 the controller can also store a Ramp-Hold program
as described in this section.
A Ramp-Hold program consists of a series of up to four
segments or stages. Each segment includes program-
ming of the following values. The symbol "#" represents
segment number being programmed.
Value
Firing Rate
Ramp Final Temperature
Hold Timer
Afterburner Temperature
Fan-On
All programming starts from the IdLE display. To obtain
this display, press <ANY> key, except <STOP>. Before
programming, be sure the °C indicator is lit. If not, press
the <ENTER> key, then the <°F/°C> key. CHG will appear,
then press <ENTER> again, and the °C indicator will be
lit. The Ramp-Hold program contained in memory may
be confirmed, reprogrammed, or altered by the following
steps. Displays with "/" mean the display alternates be-
tween the two values shown. To retain an existing value
without change, merely press <ENTER> during display.
To change an existing value, input the desired number
then press <ENTER>. To return to a previous segment
for review or editing, press <STOP>.
Page 8
Gilson Binder Ignition System: HM-378
Display
Function
Ramped temperature change, °C
rA#
per hour.
Desired temperature at end of
C#
ramp.
XX.XX Hours Minutes final tem-
Hld#
perature is to be held.
Temperature to which the After-
CAb
burner section is controlled dur-
ing the test.
Temperature at which the After-
burner exhaust fan is activated.
CFN
(It runs automatically during a
test.)
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