
LAUDA Ultra-Thermostats
UB 20(-D), UB 25, UB 50, UB 30, UB 40
UB 20 F, UB 20 J, UB 30 J, UB 40 J, UB 65 J
UB 20 JL, UB 30 JL, UB 40 JL
YATE0013 / 10.04.02
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To enter the difference value T
d
proceed as described in Item 9.6.1, and switch the
display to input and indication.
Example:
L
2
T
d
_30°C
Change the value by entering the figures with a resolution of 1°C.
Enter the new value by pressing
.
It is possible to select values within the temperature range from 5°C to 150°C. If this
range has not been respected the display shows
L
2
OUT OF RANGE
and there is an acoustic signal. This function can be switched off by entering
L
2
T
d
000 °
9.7 External
control
9.7.1
External measurement inputs and external controller
The units have two Pt 100 temperature measurement inputs whose measurements can
be indicated (T
1
, T
2
).
You can connect the external Pt 100 (T
1
, T
2
) at the rear connectors 10 S in 4-wire
circuit.
Use shielded connecting cables. Connect the shielding to the plug case. Cover the
unused connectors with protective caps!
Pin connections sockets 10 S Pt 100
pin
1
2
3
4
+
+
-
-
I
U
U
I
current path
voltage path
voltage path
current path
Pt 100
DIN IEC 751
Plug, 4-pin Lemosa, for Pt 100 connection
Cat. No. EQS 022
One probe can be selected for the actual value for external control. The unit then
operates with cascade control to this actual value, i.e. the unit controls the temperature
at the external measurement point to the selected setpoint by suitably altering the bath
temperature. Thus the influence of disturbances (changes of load or through-flow, etc.)
can be reduced considerably or eliminated totally.