The desired average temperature can be adjustedon the ETS-
D or contact thermometer. In addition, a “MAXTEMP” can be
set for the ETS-D, in other words, a maximum average tem-
perature can be set for malfunctions in combination with the
RET basic. The required surface temperature of the heating
plate can be selected with the “Temp” dial.
Adjusting the “Temp” dial to the maximum adjustable temperatu-
re will result in the fastest possible heating time, but the average
temperature may fluctuate to values above the set-point tempera-
ture on the contact thermometer, for example. By adjusting the
“Temp” dial to approximately twice the set-point value (thus with
a set-point ot 60°C the Temp dial would be set to 120°C), you will
reach a good compromise between a fast heating time and overs-
hooting the set point.
If you adjust the Temp dial to exactly the set-point temperature,
the medium will not reach the set-point temperature, since some
loss of the heat will always occur between the heating plate and
the medium.
The maximum heating plate temperature can be adjusted will
the “Safe Temp” screw.
The funktion stirring is started and stopped by its corresponding
switch. If the function “Stirring” is started, the LED “Mot” besi-
de the the imprint “Mot”shines green.
The speed of the drive can be adjusted on the “Mot” dial with
the corresponding scale from 50 to 1500 rpms.
The motor speed of the instrument is kept constant by a control
circuit.
12
RET BC 1001
Settigs
For the detailed instructions for settings and limit values, please
refer to the operating instructions for the instrument you are
connecting.
Safety contact thermometers
acc. to DIN 12 878 class 2 or acc. Gerstel are connected with a
three-wire cable, the test current flows through the contact ther-
mometer.
Safety function:
If the test current is interrupted because of e.g. breakage of contact
thermometer or falling out of the cable plug, the heating cuts off.
The required plug allocation is indicated on a reference plate
above the diode bushing.
Contact thermometer without safety circuit
acc. to DIN 12 878 class 0. The instrument only heats if the test
current circuit is closed by an electrical connection of the plug
pins 3 and 5.
2-wire connecting cables:
Connect plug pins 3 and 5 of the instrument plug.
3-wire connecting cables:
Here the test current circuit can also be produced in the terminal
head of the contact thermometer (connect plug pins 2 and 3).
A 3-wire cable with the required bridge is available (accessories).
Function Stirring
point temperature on the RET basic, the ETS-D immediately
and permanently turns off the separate circuit of the RET
basic.
The stirring function then continues to run at the speed that was
set before the malfunktion.
A 6-pin jack is located on the rear side of the instrument for connec-
ting the ETS-D, the contact thermometer or the contact plug. The
electronics of the instruments returns a test current that must flow
via connector pins 3 and 5 for the heating plate to heat up.
RET basic C 1204 14.01.2005 11:44 Uhr Seite 12
