Intended Use
1.
The Type 30400 Automatic and Programmable
furnaces are general laboratory and heat treat-
ing furnaces. For optimum element life,
Barnstead Thermolyne recommends these fur-
naces for applications requiring temperatures
from 400°F (204°C) to 1800°F (982°C) for con-
tinuous use, or temperatures from 1800°F
(982°C) to 2000°F (1093°C) for intermittent use.
Continuous use is operating the furnace for
more than 3 hours and intermittent use is oper-
ating the furnace for less than 3 hours.
2.
The unit consists of 1) a heating chamber; 2) an
automatic proportioning digital set, digital read
control with overtemperature protection and 3) a
door interlock relay for user safety.
3.
The Type 30400 Programmable furnace is
designed to control a programmed temperature
profile. The profile is in the format of ramps and
dwell segments. The first ramp, RAMP 1, starts
at the initial measured furnace temperature. This
ramp is positive going at a programmed rate
until the programmed level is reached. The set-
point will stay at this level for a period deter-
mined by the setting of DWELL 1. Additional
positive or negative going ramps are now initiat-
ed starting at the level at the end of DWELL 1.
When the second ramp reaches the second pro-
grammed level, the setpoint stays at that level
for the duration of the segment. Depending
upon the model ordered, additional ramp and
dwell segments may be added. See specific
model number in proceeding chart for total num-
ber of program segments.
4.
The Type 30400 Automatic furnace is designed
as a single set point controller which reaches
and maintains one temperature value.
General Usage
Do not use this product for anything other than its intend-
ed usage.
8
Introduction
Note
When in the program RUN mode, the
programmable controller serves to pro-
vide a programmed temperature pro-
file as described earlier. When in the
single setpoint automatic mode, the
unit serves as an automatic tempera-
ture controller.
