Unit description
4
3 Unit description
3.1 Unit types
The type designation of the Ecoline low-temperature thermostats consists of the letter R (identification as
low-temperature unit), the control unit E 200 and the type of bath and refrigeration system
Example: Control unit E 200 and bath RE 004 produces Thermostat Type RE 204.
Type RE 220 is supplied without bath cover. A bath cover is available as accessory.
(➾ Section 10. Accessories).
3.2 Pumps
All units are equipped with a pressure pump with vario drive. The pump has an outflow with a rotatable
discharge elbow. An additional outflow provides circulation inside the bath.
By turning the setting knob it is possible to choose between both outlets or to divide the flows.
The pump ca n be used up to viscosities of 150 mm²/s however, to get an optimum accuracy of control a
viscosity of < 30 mm²/s is recommended.
One of five pump output steps can be selected using the operating menu.
On small low-temperature thermostats (e.g. RE 204 or RE 206) and with operation as bath thermostat it
is advisable to use output step 2. The advantage is a low heat generation while having a uniform
circulation, that means, that the thermostat can work without cooling down to just above ambient
temperature.
When operating as circulation thermostat with an external circuit it is preferable to use a larger flow rate
in order to ensure a small temperature difference, especially at higher temperatures and in conjunction
with oil as the bath liquid.
The pump connection outflow can be closed off without causing any damage to the pump.
Pump characteristics (➾ Section 9. Technical data)
3.3 Temperature indication, control, and safety circuit
The unit is equipped with a 2-line LCD-Display with additional symbols for indicating bath temperature
and settings as well as operating states. The input of the setpoint and other additional adjustments are
done using either two or three keys.
Remote operation is possible via an electrically isolated RS 232 interface
A Pt 100 temperature probe is used for measuring the actual temperature and for control. A second
Pt 100 serves as temperature probe for the safety circuit (overtemperature protection) which is
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