Fisher Isotemp 800 Series forced air, programmable
ovens are available in three sizes: small (Model 825),
medium (Model 838) and large (Model 851). All models
provide PID microprocessor control at operating tempera-
tures ranging from 50°C (122°F) to 325°C (617°F).
The system microprocessor permits the user to customize
one to four programs, each containing up to 24 steps.
The user can program ramps, soaks or jumps between
steps. The programs are stored in non-volatile memory
to preserve their contents.
Temperature readouts and control parameters are shown
on 7-segment, red, light-emitting diode (LED) displays.
Two additional LEDs indicate when heater power is being
applied or an over temperature condition is encountered.
The Model 825 accommodates a maximum of five
shelves. The Models 838 and 851 hold eight and eleven
shelves, respectively.
Isotemp ovens incorporate a variety of safety features. A
safety backup is built into the controller software. If the
primary heater control fails, the backup will maintain con-
trol at 5°C above the set point. A circuit breaker protects
the oven from power surges.
3
Introduction
Summary of Contents for Isotemp 800 Series
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