VDH ALFA 19, User Manual, Page: 2 / 4

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* Adjustment sensor.
The sensor can be adjusted by using the Sensor Offset (parameter 04). Indicates the ALFA(NET) 19
e.g. 2% too much, the Sensor Offset has to de decreased with 2%.
* Error messages.
In the display of the ALFA(NET) 19 the following error messages can appear:
EE - Settings are lost. Solution:
- Reprogram the settings.
* Technical details.
Model : ALFA(NET) 19 Humidify/dehumidify Hygrostat
Range : 0/+100%RH, readout per 1%RH
Supply : 230 Vac 50/60Hz
Relay : SPDT 250V/16A(C-NO), 8A(C-NC) (cos phi=1)
Control : by push buttons on the front.
Communication : RS485-Network (2x twisted pair shielded, min. 0,75mm
2
)
Front : Polycarbonate
Sensor : 0-1Vdc (0-100%RH) from RH95-2, LC95-2 or RH970
Be aware! Humidity sensors should be external supplied with 12Vdc
Sizes : 90 x 53 x 58mm (hwd)
Panel hole : 46 x 53mm (hw)
- Provided with memory protection during power failure.
- Connection with screw terminals on the back side.
- Special version on request available.
* Function diagram.