1
User manual
ALFANET 79
Hygrostat.
VDH doc: 010668
Version: v1.0
Datum:19-03-2001
Software: ALFA(NET)79
File: Do010668.WP8
Range: 0/+100%RH
* Installation.
On the topside of the
ALFANET 79
is shown how the sensor, power supply and relays has to be
connected.
After connecting the
ALFANET 79
to the power supply, a self test function is started. As this test is
finished the measured humidity appears in the display.
And adjustable thru the
ALFANET PC-INTERFACE
on the PC.
* Control.
The
ALFANET 79
Hygrostat can be controlled by four push buttons on the front. These keys are:
SET
- view / change setpoint and reset alarm.
UP
- increase value.
DOWN
- decrease value.
%RH
- hidden key above
SET
key and behind %RH symbol.
* View setpoint.
By pushing the
SET
key the setpoint appears in the display. The decimal point of the last display
starts blinking to indicate this. After a few seconds after releasing the
SET
key the setpoint
disappears and the measured temperature is shown again.
* Changing setpoint.
Push the
SET
key and the setpoint appears in the display. Release the
SET
key. Now push the
SET
key again together with the
UP
or
DOWN
keys to change the setpoint. After a few seconds
after releasing the
SET
key the setpoint disappears and the measured temperature is shown
again.
* Status of the Relays.
By pushing the hidden
°C
key the display shows the status of the relays. Each display segment
shows the status of the relay output, showing 0= off and 1=on. The code 110 means relay 1 and
relay 2 are on and relay 3 is off.
* Setting internal parameters.
Next to the adjustment of the setpoint, some internal settings are possible like differentials,
sensor-adjustments, setpoint-range and function of the hygrostat.
By pushing the
DOWN
key for more than 10 seconds, you enter the 'internal program-ming
menu'.
In the left display the upper and the lower segments are blinking. Over the
UP
and
DOWN
keys
the required parameter can be selected (see table for the parameters).
If the required parameter is selected, the value can be read-out by pushing the
SET
key. Pushing
the
UP
and
DOWN
keys allows you to change the value of this parameter.
If after 20 seconds no key is pushed, the
ALFANET 79
changes to it’s normal operation mode.