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FED (E2) 03/2019 page 23/57
6.4.1 Temperature unit change between degrees Celsius °C and degrees Fahrenheit °F
If required, the temperature display can be changed as follows:
1. Press down
button for approx. 5 seconds.
The display alternately shows “unit” and the actual setting of the temperature unit:
2. Use the
buttons to set the required unit.
3. The set unit is automatically adopted after 2 seconds.
C = degrees Celsius
F= degrees Fahrenheit
0 °C = 31°F
100 °C = 212°F
Conversion:
[Value in °F] = [Value in °C] ∗ 1,8 + 32
When specifying the set point ramp (see chap. 6.4.2) this setting is accordingly taken as the basis.
If the unit is changed, the temperature set-point and limits are converted accordingly.
6.4.2 Enter a temperature ramp
Temperature ramps can be programmed in order to extend heating up times. This may be necessary in
some cases, in order to prevent temperature stresses in the material during the heating up phase.
Temperature ramps should only be used if required. The use of temperature ramps may result in the
heating up times being considerably slowed down.
The entry in °C/min or in °F/min meaning the nominal value gradient and limits the maximum temperature
increase to this value. Due to the heat and evaporation energy assumed by the drying material, smaller
temperature gradients may also result.
A temperature ramp proceeds from the previously entered to a new set-point. The temperature must have
adjusted to the start set-point. Enter settings in 3 steps:
1. Enter set-point of ramp start temperature. Let temperature adjust to this set-point temperature.
2. Set the ramp to the desired gradient in °C/min or in °F/min.
You can enter a gradient value from 0 up to 10.
Setting the gradient to 0 means ramp function off = maximum heating power.
Setting the gradient to another value, e.g., 3, means the chamber will try to heat up with a speed of 3
°C/min.
A heat-up rate of 4 °C/minute can be regarded as a realistic maximum.
3. Enter set-point (final ramp temperature).
The ramp should only be set if required. The setting “0” means ramp function switched off. The chamber
is being heated at maximum heat output.
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