INSTALLATION MT100 Multipoint Flow Meter
4-20 mA Output
The MT100 is provided with two 4-20 mA current loop channels via the J9 Phoenix connector terminals. The connector accepts 28-16
AWG (0.14 mm
2
-1.5 mm
2
) wire (refer to Table 2, page 23 for wire size vs. length info). Ch. 1 is dedicated to HART. See above for
connection details. Connect the instrument’s second 4-20 mA output (CH2, J9-3) as required for your application. Use any RTN terminal
(e.g., J9-5) for the current loop return.
Modbus
The MT100 Modbus interface is provided by the J25 Phoenix connector terminals. The connector accepts 26-14 AWG (0.14 mm
2
-1.5 mm
2
)
wire (refer to Table 2, page 23 for wire size vs. length info). Connect the MT100 to a Modbus device/network using a 2-wire RS-485 connection
scheme as shown in Figure 25 below. For details on Modbus operation refer to Modbus Operation, page 74.
DEVICE 2 DEVICE 3
RS-485 MASTER
DEVICE 1
One twisted wire pair
To remaining
RS-485 Devices
DATA (B)+
DATA (A)-
GND
DATA (B)+
DATA (A)-
GND
DATA (B)+
DATA (A)-
GND
DATA (B)+
DATA (A)-
GND
2-WIRE ONLY DEVICE
plus Gnd/Common.
C01415-1-1
Figure 25 – Modbus Wiring
MODBUS CONFIGURATION
Refer to Figure 20 on page 23.
As required for your application set 0.100" jumper shunts on the SB4 main board as needed to configure the Modbus lines as listed in
Table 3 below. (Remove sensor cable guide bracket if necessary.) Termination is typically required for applications with faster data rates
and/or long cable lengths – enable the instrument’s terminator as required for your application. Line biasing is used to ensure that lines are
at a known state (noise can cause a false trigger on a floating line). Check first that the RS-485 network is not already biased before
enabling the MT100 line biasing.
Table 3 – Modbus Line Configuration Jumpers
Note: 1. ● = Jumper Installed
Fluid Components International LLC 28
To Next Page
Loading...
