Endress+Hauser Prosonic Flow 90, Operating Instructions Manual

Page: 39 / 114

Proline Prosonic Flow 90 4 Wiring
Hauser 39
4.2.3 HART connection
Users have the following connection options at their disposal:
• Direct connection to transmitter by means of terminals 26 / 27
• Connection by means of the 4...20 mA circuit.
!
Note!
• The measuring loop's minimum load must be at least 250
Ω
.
• After commissioning, make the following settings:
– CURRENT SPAN function
→
“4...20 mA HART” or “4...20 mA (25 mA) HART”
Connecting the HART handheld communicator
For connecting, see also the documentation issued by the HART Communication Foundation, and
in particular HCF LIT 20: “HART, a technical summary”.
A0001136
Fig. 36: Electrical connection of the HART handheld communicator:
1 = HART communicator, 2 = power supply, 3 = shield, 4 = other evaluation devices or PLC with passive input
Connecting a PC with operating software
A HART modem (e.g. Commubox FXA 191) is required for connection of a personal computer
running operating software (e.g. “ToF Tool - Fieldtool Package”).
See also the documentation issued by the HART Communication Foundation, and in particular
HCF LIT 20: “HART, a technical summary”
.
A0001137
Fig. 37: Electrical connection of a PC with operating software
1 = PC with operating software, 2 = power supply, 3 = shield, 4 = other switching units or PLC with passive input,
5 = HART modem, e.g. Commubox FXA 191
+26
-27
1
2
3 4
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375
FIELD COMMUNICATOR
3
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RS 232
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250