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CB / CB-UL, CBF / CBF-UL (E7) 07/2021 Page 86/197
9.7.2 Set-point ramp and set-point step
You can define the type of transitions for temperature, CO
2
concentration, O
2
concentration (chamber with
O
2
control) and humidity (CBF / CBF-UL) for each individual program section.
“Ramp” mode: Gradual set-points changes
The set-point of a given program section functions as the section’s start value. During the section’s duration,
each set-point gradually passes to the set-point of the subsequent program section. The actual value
follows the continually changing set-point.
If the last program section is in “ramp” mode and the setpoint shall change within this section, then you
must program an additional section (with the shortest possible section duration) to provide the target value
of the last program section. Otherwise, the setpoint would remain constant during the section’s duration.
Programming in the “ramp” mode allows all kinds of temperature and CO
2
/ O
2
and humidity transitions:
• Gradual changes of temperature and CO
2
/ O
2
concentration and humidity
The setpoint changes its value gradually during the entered section duration. The actual value follows
the continually moving set-point at any time.
• Program sections with constant temperature and CO
2
/ O
2
concentration and humidity
The setpoints (initial values) of two subsequent program sections are identical; so the temperature and
humidity remain constant during the entire duration of the first program section.
• Sudden changes of temperature and CO
2
/ O
2
concentration and humidity
Steps can be programmed in ramp mode as temperature / CO
2
/ O
2
/ humidity changes (ramps) that
occur during a very short interval. If the duration of this transitional program section is very short
(minimum entry 1 sec), the temperature, CO
2
/ O
2
or humidity change will proceed rapidly within the
minimum amount of time.
“Step” mode: Sudden set-points changes
The set-point of any program section functions as the section’s target value. At the start of the program
section, heating up, attaining the set gas concentration and humidification occur with the maximum speed
to reach the set-point values and then remain constant for the remaining section time. Therefore the set-
points remain constant for the section’s duration. These changes occur rapidly within the minimum amount
of time (minimum entry: 1 second).
Programming in the “step” mode allows only two kinds of temperature / CO
2
/ O
2
/ humidity transitions:
• Programming gradual changes of temperature / CO
2
/ O
2
/ humidity (ramps) is impossible in the “step”
mode
• Program sections with constant temperature and CO
2
/ O
2
concentration and humidity
The setpoints (target values) of two subsequent program sections are identical; so the temperature /
CO
2
/ O
2
/ humidity remain constant during the entire duration of the first program section.
• Sudden changes of temperature and CO
2
/ O
2
concentration and humidity
The entered setpoint of the section is reached as fast as possible and then held constant for the
remaining section duration.
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