FCI ST100A Series - Figure 23 - Single Connection and Multidrop HART Setups; Figure 24 - Ch. 3 4-20 Ma Output, J8 (Aux. Board)

INSTALLATION ST100A Series Flow Meter
28 Fluid Components International LLC
Figure 23 – Single Connection and Multidrop HART Setups
(b) HART Network, Multidrop
C01414-1-1
ST100A
HART
J25-1
J25-4
J25-2
ST100A
HART
J25-1
J25-4
J25-2
ST100A
HART
J25-1
J25-4
J25-2
ST100A
HART
Network P.S.
24 VDC
HART
Master
J25-1
R
LOAD
HART
I/O
J25-4
J25-2
HART+HART–
J25-4
HART
Master
R
LOAD
HART
I/O
HART
Master
R
LOAD
HART
I/O
HART+HART–
Network P.S.
24 VDC
ST100A
HART
(a) HART Single Connection
Internal Loop Power External Loop Power
+
–
–
J25-1
J25-2
ST100A
HART
NC
+
J25-1
J25-2
4-20 mA Output Connections
C
onnect the Ch. 1 and Ch. 2 4-20 mA current loop output to the J25 Phoenix connector terminals. Refer to Figure 16 and Figure 22.
Similar to flow element connector TB1 the J25 connector is a detachable plug that plugs into the header socket on the board. The
connector plug accepts 28-16 AWG (
0.14 mm
2
- 1.5 mm
2
) wire (refer to Table 2, page 21 for wire size vs. length info).
Ch. 1 is dedicated to HART (see HART Connections above for connection details). Connect the instrument’s second 4-20 mA output (Ch.
2, J25-3) as required for your application. Use any RTN terminal (e.g., J25-4 through J25-6) for the 2
nd
channel current loop return.
The 3
rd
channel 4-20 mA current loop output is provided by connector J8 on the auxiliary board. This connector is also a detachable plug
that accepts 28-16 AWG (
0.14 mm
2
- 1.5 mm
2
) wire. Connect the 3
rd
analog output to the aux. board J8 as shown in Figure 24 below.
Figure 24 – Ch. 3 4-20 mA Output, J8 (Aux. Board)