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BD-S / BD-S-UL, ED-S / ED-S-UL, FD-S / FD-S-UL (E1) 10/2020 page 22/59
11. Ramp function
You can program temperature ramps in order to extend heating up times. This may be necessary in some
cases to prevent temperature stress in the material during the heating up phase. Temperature ramps
should only be used if required. Using them may result in considerably slowing down the heating up
times. When the ramp function is turned off, the chamber will heat up with its maximum heating capacity.
The desired temperature rise is entered as a set-point gradient in degrees per hour. This gradient limits
the maximum temperature increase to the entered value. Due to the heat and evaporation energy as-
sumed by the drying material, smaller temperature gradients may also result.
You can select a gradient from “0.001” up to “9999” degrees per hour. The chamber will try to heat up
according to the entered gradient. A heating-up rate of 24 °C per hour for the incubators BD-S / BD-S-UL
and of 240 °C per hour for the heating and drying ovens ED-S / ED-S-UL and FD-S / FD-S-UL can be
regarded as a realistic maximum.
The ramp proceeds from the actual value (equilibrated start set-point) towards the entered target set-
point. During ramp operation the effective ramp set-point (SPr) continually rises in accordance to the en-
tered gradient from the start set-point to the target set-point. The actual value follows this continually
changing effective ramp set-point. As soon as the entered target set-point (ramp target temperature) is
reached, this value is maintained constant.
Figure 8: Set-point types during ramp operation
11.1 Setting the ramp
1. Enter the start set-point of the ramp (chap. 7) and let the temperature equilibrate to this value.
2. Set the desired gradient in the „rAtE“ menu
Setting „0.001“ up to „9999“: Maximum temperature rise in °C per hour or °F per hour.
Setting „Off“: deactivated ramp function. The chamber will heat up with its maximum heating capacity.
3. Then enter a new set-point as the ramp’s target set-point (chap. 7).
As soon as the entries have been adopted, the ramp function is activated. The chamber heats up with the
entered gradient, as long as the entered set-point (SP) exceeds the actual temperature value.
Start set-point
Effective ramp set-point
SPr
Target set-point
SP
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