Tips; Connections And Interfaces - IKA IKAMAG RET control-visc C Mode D'emploi

The intermittent mode must be OFF.
After the speed of the motor and of the magnetic bar in the medi-
um have stabilized to the set rated speed (waiting time about 3
minutes), the viscosity measurement is started by pressing foil
key „Visc".
The real controlling variable is stored as reference value 0 %
∆P, and is digitally displayed. Further displayed are the set
rated speed, as well as the viscosity change in %.
Depending on the increase or decrease of viscosity, the value
is displayed as positive or negative value. A simultaneous dis-
play of the precentage and of the real speed is not possible.
By presing foil key „mode", it is possible to inquire rated and
real temperature , but the measurement of the viscosity trend
has priority, and the instrument switches the digital display
back to trend display after about 5 seconds. When the stirring
function is switched off, the trend display is switched off as
well. Analog, the trend display can only be switched on with an
activated function „stirring".
PLEASE NOTE:
While the measurement of the viscosity trend is on, the
state of the heating plate cannot be seen on the digital dis-
play, even if the heating plate is exceeding 50°C.
13

Tips

• Ensure that the medium is well mixed. (High speeds and
large stirring bars ensure good mixing). A medium which is
well mixed will ensure uniform temperature distribution and
better temperature control.
• The temperature sensors (PT100, PT1000) should be im-
mersed to the maximum possible depth. The minimum
immersion depth is 20 mm; do not go below this figure.
• When using metal vessels, do not place the temperature
sensors on the bottom of the vessel. Placing sensors on the
vessel bottom can cause excessively high temperatures to
36
be measured especially in media which have poor conduc-
tivity. The tip of the measuring sensor must be at least
5 mm from the vessel bottom; a distance of 10 mm is ideal.
• With highly viscous reaction media, the distance between
the heating plate and the stirring bars must be kept as small
as possible (to reduce the risk of stirring bar breakaway).
14

Connections and interfaces

Analog output
Connection
and RS 232 C
Pt 100 / Pt1000
1
3
speed 1V
^
5 1/min
4 = 1000
2
viscosity trend
100% = 3,5V
-100% = 1,5V
1
3
5 4
2
Mains connection
analog GnD
TxD
RxD
RS232_GnD
RTS
1
5
10 6
15 11
CTS
temperature
^
1V = 100 °C
RETCV_0107