afriso Europress Notice Technique page 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 muted with the Acknowledge key. The switching point for
"Alarm on" must be at least 30 mbar higher than the static pressure of the
stored liquid and the groundwater.
The product triggers visual and audible alarms. The alarm signal can be
transmitted to additional equipment (for example, horn or warning light with
rotating reflector) via the output relay.
Products with EnOcean® wireless module
The AFRISOhome gateway allows for automatic transmission of messages
in the case of an alarm.
4.5 Relay output
The product features a voltage-free changeover contact. If no alarm is pres-
ent, the relay is de-energised. In case of an alarm, the relay is energised and
switches the changeover contact.
The product can be operated with or without additional equipment, for exam-
ple:
• Visual and audible alarm units
• Remote alarm equipment
• Building control systems
Product description
Europress
EN
14