3.2 Heating/cooling control of a chemical reaction device
3-5
Typical Control
Examples
3.2 Heating/cooling control of a chemical reaction
device
In temperature control of chemical processes where heat is naturally generated by chemical reactions,
heating output and natural cooling are not a sufficient means of control, and thus heating/cooling control is
used whereby heating output and cooling output are simultaneously manipulated.
Heating/cooling control is also used for high-precision control of constant-temperature tanks where the
temperature is held at a constant level, and for extraction molding where the molding material generates
heat.
Heating/cooling control can also be applied to pH control using acids and alkali in liquid mixture systems,
and to pressure control where pressure reduction is carried out.
■ Application
When the E5AR is used to control a chemical reaction device, the
control mode is set to heating/cooling control and instrumentation is as
shown in the following example.
In addition to control of chemical reactions and other pro-
cesses that naturally generate heat, heating/cooling con-
trol is also being increasingly used to shorten heating and
cooling cycles for improved production efficiency in batch
process production.
Example: Heating/cooling control of a flip chip bonding
machine
IN1
PV
+
-
SP
Channel 1
PID*
MV
OUT1
OUT2
SUB1 SUB2 SUB3 SUB4 U-ALM
PV
SV
MV
OUT1 OUT2 OUT3 OUT4 STOP RSP
8
8.8.8.8.8
8.8.8.8.8
8.8.8.8
A/M
PF1 PF2/CH
M
Cold water
tank
Warm water
tank
E5AR
Solenoid valve
Temperature
sensor
Outer tank
Inner tank
Hint
To Next Page
Loading...
Need help?
General
