12
Pro Series
Furnace Operations Manual
Set vacuum Level
The factory setting for vacuum is 71 cm of mercury. The
acceptable level is from 22 cm to 74–75 cm of mercury or
9.0 inches to 28.0 inches of mercury.
If the furnace does not pull a minimum vacuum of 10
inches within 20 seconds of calling for it, the program will
be aborted and the furnace will display "Vacuum Error."
Additionally, if the target vacuum level has not
been reached within 1.5 inches of the target by 100
seconds, the program will be aborted and a warning
screen will be displayed, indicating a vacuum error.
If CONTINUOUS VC PUMP has been selected by using
the
Special Functions
menu, the vacuum pump will
run throughout the vacuum cycle. If CONTINUOUS VC
PUMP has not been selected, the vacuum pump will
shut off after the target level has been reached and at
least 5 seconds have elapsed. The vacuum pump will be
restarted when the vacuum level has dropped to 1 inch
below the target value.
The furnace uses an
absolute vacuum sensor
.
With an absolute sensor, adjustments are
not necessary at high altitudes.
To set the vacuum level for all programs do the following:
1. Press the
Special Functions
button.
2. Turn the
Select Knob
until SET VACUUM LEVEL
is displayed.
3. Press the
Next
button to look at or change
the vacuum level.
4. The current setting will be displayed.
Turn the
Select Knob
to change this value.
5. Press the
Next
button to accept the new value.
Degrees F or Degrees C
The furnace may be set to display all values using the
metric system with degrees in Centigrade and vacuum
in centimeters of mercury or to display all values using
the American/English (standard) system of degrees
Fahrenheit and vacuum in inches of mercury.
1. Press the
Special Functions
button.
2. Turn the
Select Knob
until TEMP IN C OR F?
is displayed.
3. Press the
Next
button to look at or change the
measurement system in use.
4. TEMP CENTIGRADE?
Will be displayed. Turn the
Select Knob
to select YES for metric units or to NO
for American/English (standard) units.
5. Press the
Next
button.
Set Program Start Delay
The furnace has a unique feature that allows the operator
to program a delay to occur before the start of all
programs. This delay occurs before the entry time set
into each program begins. This feature may be changed
without affecting the programs or calibrations stored in
the furnace.
1. Press the
Special Functions
button.
2. Turn the
Select Knob
until second line on the dis-
play reads PROG START DELAY.
3. Press the
Next
button to look at or change the start
delay time.
4. The display will read TIME = 0.00
or any time
delay previously entered. Turn the
Select Knob
to change the time as desired.
5. Press the
Next
button.
Note:
The delay subtracts the time it takes to heat the
muffle to the entry temperature so the delay time may
appear shorter than originally programmed. As an
example; let’s assume the delay is set for 30 minutes,
the entry temperature is 500° C, and the time it takes
the furnace to reach 500° C is 15 minutes. The furnace
would count down 15 minutes to the beginning of the
program and then would begin heating to the entry
temperature. This gives us a total of 30 minutes before
the table rises to the muffle.
15946 Pro Series English.indd 12
5/9/08 2:51:10 PM