VDH ALFANET 79 PI User Manual

1 Function
The ALFA(NET) 79 PI is a Panel mount hygrostat-unit. The hygrostat has three relay outputs
selectable for function humidify, dehumidify or alarm. And an PI-output 0-10Vdc for function
humidify or dehumidify. The relative humidity is being measured by a RH-sensor (Relative
Humidity) with an 0-1Vdc = 0-100%RH signal output.
The ALFANET 79 PI is provided with a RS-485 network connection, with which it can be readout or
set on the ALFANET.
2 Installation
On the connection diagram of the ALFA(NET) 79 PI is shown how the sensor, power supply, relays,
PI-output and optional network are to be connected. After connecting the ALFA(NET) 79 PI to the
power supply, a self-test function is started. As this test is finished, the measured relative humidity
appears in the display.
3 Control
The ALFA(NET) 79 PI hygrostat can be controlled by four pushbuttons on the front. These keys are;
8 SET
∏ UP
π DOWN
%RH STATUS
Description: Alfa(net) 79 PI 0/100%RH
Type: User manual
File: Do170986 ALFANET 79 PI 0_100%RH
Flash V10 EN.docx
VDH Products BV
User manual
0/100%RH
- view / change set value and reset alarm.
- increase set value.
- decrease set value.
- hidden relays status key.
ALFA(NET) 79 PI
Pages: 8
By: BVDB
Signed:
Software: 170962
Doc.no.: 170986
Version: 1.0
Date: 16-08-2017