User manual

Security & Electronic Technologies GmbH Seite 7
Connection of the relay contacts of SmartBox 2 and SmartBox 3
The indicator SmartBox 2 has two relays (SmartBox 3 1 relay) for the connection
of external control circuits or for activating external alarm or signal devices. In
case of failure of the unit and if the fill level (and optionally the temperature) is
above the selected limit, the contact of relay terminals 6 + 7 and 9 + 10 are
closed, or 5 + 6 and 8 + 9 are open- see the legend on the PCB in the unit.
Switching voltage max.: 250 V AC
Switching current max.: 3.5 A
Connection: closed for alarm open for alarm
Relay 1 terminals 5 + 6 terminals 6 + 7 SmartBox 2
Relay 2 terminals 8 + 9 terminals 9 + 10 SmartBox 2, 3
Connection of interface to SmartBox 4, SmartBox 5 or PC-Link
The measured values can be transmitted to the SmartBox 4, SmartBox 5 or the
PC-Link set via the integrated interface “SERIAL LINK OUTPUT” terminals
3 + 4.
Connection
probe cable
1+ = red
2- = black