Specifications

13 Barnstead |Thermolyne • 800-553-0039
Operation of 2 Ramp & 2 Dwell Programmable
Models (F30420C-70, F30428C-70, F30420C-60-70,
F30428C-60-70)
Controls and Displays
Digital Readout:
The digital readout continuously displays chamber (upper display) and setpoint (lower display)
temperatures unless the PAR (parameter) button is depressed.
If a program is in either run, Hb or Hold, pressing "PAR" once causes the lower display to indicate the
current segment of the program (r1, d1, r2, d2, or Hb) along with °C or °F. If the program is currently in
either d1 and d2, the value shown below these parameters (d1 and d2) reflects the time remaining in the
segment.
While the program is in run, Hold, or Hb, the set point shown on the bottom display is the current working
set point.
When the controller is in idle, depressing PAR shows each parameter and its current value in turn on the
display. The parameter value can either be modified with the "up" or "down" push buttons or left
unmodified.
See Parameters for a list of the controller parameters in order.
NOTE
In the event of a thermocouple break (open circuit), the numeric display increases rapidly
upscale, then displays "Sn b" (sensor break), and may alternatively flash "HiAL" (high alarm)
and/or dAL (deviation alarm) and the sensor break power value.
A reversed thermocouple connection or incorrect thermocouple will cause the display to read
"ur" (underrange) and the control will maintain the sensor break power output value selected.
NOTE
When performing operations with the controller, if you depress and release either the "PAR,"
scroll "up," or scroll "down" push buttons and more than 6 seconds elapse before the
buttons are used again, the display screen will automatically switch to displaying chamber
temperature. If this happens, you will have to step through each parameter until you reach the
point at which the interruption occurred. The parameter values you adjusted earlier, however,
will not be lost or altered. Holding down on "PAR" allows longer viewing time.
Power Switch: Set power switch to the "ON" position. The CONTROLLER will illuminate when power is
on.
CAUTION
Remember that whenever the power switch is turned "ON," the furnace will begin to heat
at the setpoint temperature that was previously set. This value will remain unchanged for
up to a year without power being applied to the control.