Recirculating coolers
27
6.3.2.
Setting the control ratio for feed/return flow temperature
50 (%)
21°C
22°C
20°C
-0.5°C
+0.5°C
50
50
0 .. 100 (%)
21°C
22.5°C
20°C
0
100
H
ACTUAL
SET
In respect to the values for feed and return
temperature and the factor set with the key "H" an
almost constant temperature value may be
maintained in the external system. The control
function quickly responds to changing conditions
(ambient temperature, reaction heat), and thus spares
the use of an external sensor.
The control ratio for feed and return flow temperature
is factory preset to "50:50".
For enabling optimum control performance for
asymmetric experiments, this ratio may be adjusted
from 0 to 100 %.
0 %
control with full respect
to feed temperature
100 %
control with full respect
to return temperature.
Setting
:
n
Press the key
.
Follow the instructions under section 6.3.1.
page 26
o
p
q
A B
H
40 (%)
21°C
22.5°C
20°C
40
Calculation example:
Look up the values for control ratio, actual feed and
return temperatures on the display by pressing the
keys (A, B, H).
Example:
ϑ
RETURN
= 22.5 °C
ϑ
FEED
= 20 °C
factor
=
40
%
Formula for calculating the actual value:
ϑ
ACT
C
C
=
°
+ °
−
22 5
40
100
20
100 40
100
.
(
)
ϑ
ACT
C
= °
21
