Vaisala PTU300 - Manual (Page 58)

User's Guide _______________________________________________________________________
56 ___________________________________________________________________ M210796EN-G
0503-037
Figure 31 Relay Module
The following numbers refer to Figure 31 above:
1 = Indication led for the relay 1 or 3
2 = Relay test buttons
3 = Flat cable pins
4 = Indication led for relay 2 or 4
WARNING The relay module may contain dangerous voltages even if the
transmitter power has been disconnected. Before opening the transmitter
you must switch off both the transmitter and the voltage connected to
the relay terminals.
WARNING Do not connect the mains power to relay unit without grounding the
transmitter.