Operation; Control Mode; Ramp And Soak Mode - Fisher Scientific 650 Series Instruction Manual

Operation

Note
To rapidly increase or decrease the
set temperature, press and hold the
appropriate arrow key. To slowly
increment or decrement the set tem-
perature one degree at a time, press
and immediately release the arrow
key.
10
The 650/750 Muffle Furnaces feature two modes of
operation:
• Control
• Ramp and Soak
Each is discussed separately in the following sections.

Control Mode

In Control mode, the muffle furnace maintains a set tem-
perature until that set temperature is changed.
To set a temperature and initiate Control mode operation,
perform the following:
1. Place the power switch in the ON position.
2. If the Run LED is lit or blinking, press Run key
until the indicator remains off.
3. Observe the set temperature in the Set Display
window.
4. To increase the set temperature, press the UP
arrow key.
5. To decrease the set temperature, press the
DOWN arrow key.
6. When the desired set temperature is shown,
release the UP or DOWN arrow key. The muffle
furnace automatically begins controlling to the
set temperature.

Ramp and Soak Mode

In Ramp and Soak mode of operation, the muffle furnace
executes a sequence of program commands. During a
ramp period, the muffle furnace temperature is controlled
to increase (or decrease) at a linear rate set by the opera-
tor. During a soak period, the furnace maintains a con-
stant temperature for a time interval selected by the oper-
ator.