AFRISO Europress Betriebsanleitung Seite 72

4.4 Function
The product draws in air via the drying filter and pumps it via the pressure line
to the interstitial space of the tank until the operating pressure has been built
up.
The pressure switch measures the pressure in the interstitial space via the
measuring line and keeps it at a constant level together with the pump.
If a leak occurs in the inner wall or outer wall of the tank either above or below
the level of the stored liquid or the ground water, and if this leak is greater
than the pumping capacity of the pump, the overpressure will drop. When the
alarm threshold for the switching point is reached, the red LED lights perma-
nently and the audible alarm is activated. The relay is energised. The audible
alarm can be switched off by pressing the Acknowledge button. The switch-
ing point for "Alarm on" is at least 30 mbar higher than the static pressure of
the stored liquid / the groundwater.
4.5 Relay output
The product features an output relay with a voltage-free contact. If no alarm
is present, the relay is de-energised. In case of an alarm, the relay is ener-
gised.
The product can be operated with or without additional external equipment,
for example:
• Visual and audible alarm units
• Remote alarm equipment
• Building control systems
4.5.1 Products with EnOcean® wireless module
In the case of an alarm, the wireless module transmits the alarm message
via EnOcean® wireless technology in addition to the visual and audible
signals.
Product description
Europress
EN
14