Materials; Temperature Display, Control And Safety Circuit - Lauda PROLINE P 5 C Operating Instructions Manual

At the right-hand side and at the back of the unit outflow and inflow nozzles are fitted for external loads. This means
that up to two external loads can be directly connected without a distributor. Connections which are not required
must be closed off with the supplied caps and union nuts.
A bypass valve can subdivide the total volume flow variably between the bath (internally) and the connected load (exter-
nally). Consequently, no "pump short circuit" is needed. If no load is connected to the pump connector, the bypass valve
must be set to the "internal" position for the best bath circulation.
In the heating range the Varioflex pump operates up to viscosity values of 150 mm²/s. In the closed-loop control
mode 50 mm²/s should not be exceeded. The temperature control is the best with 30 mm²/s and lower viscosity.
With small bath thermostats power level 3 to 6 is practicable.
For operation as a circulating thermostat with an external load, a higher power level is practicable to maintain the
temperature difference low, among other things also with higher temperatures in conjunction with oils as heat trans-
fer liquids.
The pump connections on the unit are fitted with M16 x 1 threads.
Pump characteristics ( Section 11).
The pump outflows of the Varioflex pump can be closed off without any impairment to the pump. Here, the "inter-
nal" setting of the bypass controller is recommended.
4.4

Materials

All parts being exposed to with the heat transfer liquid are made of high quality material appropriate to the operating tem-
perature. Non-rusting stainless steel and high quality temperature-resistant, primarily solvent-resistant plastics are used.
4.5

Temperature display, control and safety circuit

In the Master Version, the units are equipped with a 5-character green LED display, which is used for the display of the
measurements and settings, as well as the operating status. The entry of setpoints and other settings occurs under menu
guidance via four keys.
The extra features of the Command Version include a removable console with a backlit graphical display. The entry of
the setpoint and other settings occurs under menu guidance via situation-dependent cursor keys and soft keys.
A Pt100 temperature probe acquires the outflow temperature in the bath. A high-resolution A/D converter processes
the measurement. Further measurement conditioning occurs using a special control algorithm for controlling the heater
actuator, which has a low reactive effect on the mains.
An external Pt100 can be connected via a socket (10S) for the acquisition of an external temperature. This value can
be displayed and, if required, used as the controlled variable with external control (Master) switched on. In this way the
system controls the external measurement and not the outflow temperature ( 7.7.4).
The safety system conforms to DIN EN 61010-2-010. The SelfCheck Assistant monitors about 50 unit parameters,
A dual-channel system is used in which two microcontrollers monitor one another. Along with the bath temperature
measurement and control probes, there are also two safety temperature probes (Pt100) for the safety circuit for the
overtemperature cut-off and for monitoring the bath temperature probe.
The overtemperature cut-off point is displayed on pressing the key
cut-off point: ( 7.2) (Switching on) on page 27.
16 / 123 Proline heating thermostat
on the Master. Changing the overtemperature
02/2022