-
11
-
© STULZ GmbH, Hamburg
-
11
-
2.2.4 Autonomous control with ambient relative humidity transducer and compensation transducer for limiting the
outlet humi dity – (parameter A0=3)
In this case too the controller modulates steam production as a function of the measurement % rH performed by the main
relative humi dity transducer (see par. 11.3), however, in addition, its entity is limited if the relative humidity % rH2 measured
by a second compensation tran sducer placed in the air duct downstream from the humidifier exceeds the maximum desired
value.
The compensation probe has its own set point P7 and differential P8, based on which the limit of production is calculated
(see Fig. 2.2.4.1).
The production associated to the compensation transducer is limited to a value that increases with the difference.
To prevent the relative humidity measured by the transducer in the air duct downstream from the humidifier exceeding a
value considered as excessive, the control module in this mode allows a high outlet relative humidity alarm threshold P9,
to be programmed (also see par. 12.1).
If this threshold is exceeded, after a programmable delay P4, an alarm state is activated, with closing of the contact of the
corresponding relay on the main control board.
Fig. 2.2.4.1
2.2.5 Application for steam baths: control with temperature transducer – (parameter A0=4)
In applications for steam baths, where the control probe measures temperature rather than humidity, the same considera-
tions are valid as described in paragraph 2.2.3, replacing relative humidity with temperature.
The dehumidification function is not available in this operating mode.
High temperature limit 60°C, see Table 8.2.1 (P2).
10% P8
P0
Pmin
P8
P7
ON
OFF
Limit probe (% rH2)
Production limit %
Steam
production
