70 UMG70XV3-4EN 12.01.2009
7 Installation of FLUXUS G709
7.6 Connection of the Inputs
Max. 4 temperature probes Pt100 (4-wire) can be connected to the flowmeter (option).
Configure the temperature inputs (see chapter 17).
7.6.1 Connection of a Current Input
An active current source has to be connected to a passive current input. A passive cur-
rent source can be connected directly to an active current input, or to a passive current
input via an external power supply.
Connection of a Passive Current Source
At full load (20 mA), a DC voltage of min. 13 V is available for the supply of a passive cur-
rent source.
Terminal TxA is on the upper, Txb on the lower terminal row (x = 1...4).
Fig. 7.9: Connection of an external passive current source
Table 7.10: Terminal assignment of the flowmeter
terminal connection with
extension cable
connection without
extension cable
Txa red red
TxA gray red/blue
Txb blue white/blue
TxB white white
Sx Pt100 shield Pt100 shield
x = 1...4
Attention! The terminals Txa and TxB must not be connected.
Attention! Observe the polarity to avoid damage of the current source. The cur-
rent input could be destroyed by a permanent shorting of both termi-
nals.
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