Heidolph MR Hei-End - Manual (Page 38)

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E
9.2 Setting the safety temperature
The safety temperature describes a temperature difference above the set value. The
instrument will shut down with an appropriate error message if this temperature is
exceeded.
While in display mode, press the Select button (F) twice. Once a cursor appears in the
lower line, adjust the safety temperature with the arrow buttons (D). The selected value is
entered automatically.
Press the Select button F again to return to display mode. After 4 seconds this is also
carried out automatically.
Functionality of set safety

t:
When set temperature is exceeded by value of set safety

t heating is
switched off.
9.3 Switching on the heater
Press the Heater ON/OFF button (E) to start the heater function. A lit green frame around
the button (E) indicates that the heating function is enabled. The temperature can be
adjusted during operation as described in “Adjusting the set temperatures”.
The heating function is indicated by a flashing heating symbol on the display (C).
Notes on setting the hotplate temperature:
The contents of the mixing vessel will always have a lower temperature
than the set hotplate temperature due to differences in heat conductivity
of various mixing vessels, the volume of material to be heated, and heat
loss due to radiation.
As a rule of thumb, the hotplate temperature should be 1.5 to 4 times that
of the desired temperature of the medium.
The value should be increased according to the specific heat capacity,
volume and desired temperature of the medium.
Note
Note on heating time:
Higher hotplate temperatures will result in a shorter heat-up period.