Control Of Medium Temperature - Ilmvac ROdist basic Serie Instrucciones De Manejo

Furthermore, dry running of the heating bath is detected.
➣ The device switches off permanently.
When the safety circuit is set, an upper temperature limit between
50 and 190° C is defined.
1. Silicone oils as tempering media
When increased safety is not necessary the temperature of the
safety circuit stays at 190 °C.
Temperature of the tempering medium rises to a maximum of
190 °C in the case of error. Then the safety circuit switches the
heating bath permanently off.
2. Demineralised water as the tempering medium
When increased safety is not necessary, the adjustment knob of
safety circuit stays all the way to the right. As long as there is any
demineralised water in the heating bath, the temperature of the
tempering medium rises to a maximum of 100 °C in the case of
error. If the water is evaporated completely, the temperature of
the tempering medium rises to a maximum of 190 °C. Then the
safety circuit switches off the heating bath permanently.
3. Temperature-sensitive or easily flammable media in the rotary
evaporator
When the pre-set bath temperature may not be exceeded under
any circumstances set the safety circuit as described below.
Adjusting the safety circuit
☞ Set the desired safety temperature by turning knob (E) within 5
seconds of the mask (fig. 4) appearing on the LC display.
Checking the safety circuit
The safety circuit has to be checked by the user once a year.
☞ Fill the heating bath with 1 litre of water as tempering medium.
☞ Set the safety temperature to 100° C.
☞ Set the target temperature to 80° C.
☞ Start the 'Heating' function with the ON/OFF key (B).
☞ When the target temperature is reached, turn the heating bath
off and on again at the main switch.
20
☞ Set the safety temperature to 70° C.
➣ The medium temperature is thus 10 K above the safety tempe-
rature, the safety circuit trips, the LC display shows E 24, see
fig. 6.
Control of the medium temperature
The medium temperature is limited by the set safety temperatu-
re. The medium temperature is controlled by means of a PID con-
troller. The medium temperature is measured by the PT 1000 tem-
perature sensor and is heated up as quickly as possible without
overshooting to the set temperature.
The PID controller adapts to the different tempering media and
ensures optimum temperature control with minimum temperatu-
re drift and fluctuation.
☞ Set the desired medium temperature between room tempera-
ture and 180° C by turning knob (E). The max. medium tempe-
rature setting is the safety temperature minus 10 °C.
„ LCD display, see fig. 8
☞ Start the 'Heating' function with the ON/OFF key (B).
➣ An animated heating symbol appears on the LC display, see fig. 8.
➣ The heating bath is heated up to the set temperature.
➣ The target and actual temperature referred to the medium are
shown on the LC display, see fig. 8.
Select tempering medium
➣ If a target value > 90° C is set, the PID controller is adapted spe-
cially for oil.
➣ The symbol OIL appears on the LC display, see fig. 9.
➣ If the target value is reset to 20 °C the PID controller is adjusted
again specially to water.
➣ The OIL symbol will disappear from the LCD display, see e.g.
fig. 8.
2009-03-18