ADS Environmental Services IETG FlowHawk QR 775012 A4 - Manual (Page 178)

External Power 5-7
Wiring the external power cable to the IETG-supplied power supply
6. Verify the following before connecting to the power source:
 Battery pack has been disconnected and removed from the
monitor.
 Communication cable is connected to both the monitor and
the EMU or EMUX.