Electromagnetic Flowmeter COPA-XT
9
3.3.2 Supply Power Connections
The COPA-XT flowmeter is designed as a 2-Wire system, i.e.
the supply power and measurement output signal (4-20 mA
w/wo HART-Protocol) are transmitted over the same set of
leads.
a) Supply Power from a Central Voltage Source
U
M
=
Supply power COPA-XT, UM = 14 V DC
U
S
=
Voltage supply, U
S
= 14-55 V DC
R
B
=
Max. allow. load for voltage supply instrument
(e.g. indicator, recorder, cable resistance, .)
R =
Max. allow. load for output circuit – a function of the
voltage supply instrument (e.g. indicator, recorder, etc.)
b) Supply Power from Power Supply Instrument
Care should be exercised when reinstalling the housing cover
to be certain that the gaskets are properly seated. Only then is
Protection Class IP 67 assured.
Note:
During installation it is important to provide a water trap in
the cable to the flowmeter primary (Fig. 22).
Functional ground
Supply Power, DC
Fig. 18
Functional ground
Supply Power, DC or AC
Transmitter
power supply
Fig. 19
Fig. 20
Load Diagram
For information
when the HART-
Protocol has
been installed in
the converter.
(Option)
Transmitter
Power Supply
Instrument
Transmitter
Power Supply
Instrument
For Pulse or
Output Contact
Transmission
Fig. 21
Interconnection Diagram (see also Page 11)
Fig. 22
Cable Installation with a Water Trap