Closed loop system
Operation of
EV1
Operation of
EV2
Humidity
Measurement
Figure 5
Closed- loop system in STEAM.Maxi™
STEAM.Maxi
TM
First class
Dry
conditions
Saturated
conditions
Penultimate
class
Last
class
■ If the relative humidity measurement, Hm, does not fall into the penultimate class, the quantity of steam
is increased by 20% .
■ If the relative humidity measurement, Hm, is 100% o r if the four consecutive measurements of humidity
fall into the penultimate class, the quantity of steam is reduced by 20% .
In case of Humidity Measurement parameter set to ON, the timing of the opening of the solenoid valves
is proportional to the difference between the humidity value set point, Hsp and the relative humidity
value measured, Hm.
Therefore, the steam tables are chosen according to this feedback control, figured in Figure 5.
When STEAM.Maxi™ is set to 100%, the system records the number of consecutive times in which the
cooking chamber has reached the saturation level. If this value is 3, the system switches off the steam
solenoids to provide the steam table of 5% according to the oven model.
Assumption: For a specific temperature, the range of RPM between dry conditions and saturated
conditions (calculated during the humidity calibration) is subdivided into a specific number of classes.
For each class, a number of RPM and a specified humidity amount have been defined
RPM gap measured during the humidity
regulation at a specific Temperature
Figure 6
Classes of RPM defined at a specific temperature
In the case of STEAM.Maxi™ set to 100%, the oven starts producing a quantity of steam which
corresponds to the value of 100% of the oven steam table. Once the first measurement of the humidity
has been done, the quantity of steam is increased or decreased by 20% according to the following rules:
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