Fluid Components International MT86_MT86HT Manual Installation - Manual (Page 4)

FLUID COMPONENTS INTL CHAPTER 2 - INSTALLATION
Models MT86, MT86HT 2 - 4 Doc. No. 003162 Rev. F
Connection
Maximum Distance for AWG
10 ft.
(3m)
50 ft.
(15m)
100 ft.
(31m)
250 ft.
(76m)
500 ft.
152m) 1000 ft.
(305m)
AC Power 22 22 22 20 18 16
Relay (2A) 28 22 20 16 12 10
Relay (10A) 22 16 12 8 6
Not
Recommend
Flow Element Wires* 24 24 24 22 22 18
Power Connection Information
Conduit Routing
All electrical connections are to be made through the 1 inch female NPT opening in the remote enclosure. FCI
strongly recommends that all electrical cables be run through an appropriate conduit for the protection of the
flowmeter and personnel. See Figure 2-2 for the wiring diagram.
The flow transmitter design requires the power and output conduit to connect with the remote enclosure's left access
port and the local enclosure conduit to connect with the right access port(s).
Protection of the flow transmitter from moisture is important. Keep the entry of the conduit into the enclosures in the
downward direction so condensed moisture that collects in the conduit will not drain into the enclosure. The local
enclosure may not be turned more than 180° using the threads on the enclosure to gain an acceptable orientation. In
addition, FCI recommends sealing off the conduit with a potting Y or other sealing method to prevent moisture from
entering the enclosures.
Minimum Wire Size
Table 2-1 shows the smallest (maximum AWG number) copper wire which should be used in the electrical cables.
Use a lower gauge of wire for less of a voltage drop. Contact FCI concerning greater distances than those listed in
the chart.
Table 2 -1. Interconnecting Cable Size (AWG)
*Requires a shielded cable. The shield is connected to the GND pin of TS_ of the input board. The
other end of the shield is left floating (no connection to the flow element enclosure).
The standard cable provided is 22AWG.
Flow Transmitter Wiring Connections
See the wiring diagram in Figure 2-2 for the flow element wiring to the input boards. Run separate excitation and
sense wires for the ACTIVE, REFERENCE, and GROUND connections. The flowmeter will not operate properly
without these connections. If the ACTIVE and REFERENCE wires are reversed the flowmeter will output incorrect
flow rates. Use shielded cable with all signal applications. Connect the shield to the input board only and not to the
flow element terminal strip. Connect the shield to pin 1 of TS_ on the input board.
The connector for sensing point 1 must be plugged into the innermost connector on the input board which is plugged
into P1 of the control board. Sensing point 2 is connected to the outermost connector of the same input board.
Sensing point 3 is plugged into the innermost connector on the input board which is plugged into P2 of the control
board. Sensing points 4 through 8 are plugged in the same manner.
Make the customer connections to the output modules (relay logic, current or voltage).