Fluid Components International FR73B Manual Installation - Manual (Page 2)

FLUID COMPONENTS INTL CHAPTER 2 - INSTALLATION
Model FR78B Flow Switch/Monitor 2 - 2 Doc. No. 06EN003281 Rev. -
Verify Installation Location
Prepare the vessel for installation, or inspect the already prepared location to ensure that the instrument will fit
into the system. The location that should have been prepared at the time of order should be at least 20 pipe
diameters downstream and 10 pipe diameters upstream from any bends or interference in the process pipe or duct
to achieve the greatest accuracy.
Flow Element Installation
Verify the correct orientation of the flow element. Install the flow element in-line with the process media flow.
See the specifications in Chapter 1 for the various process connections available. See Appendix A for the
dimensions of the flow element.
Wiring Installation
Conduit Routing
All socket and/or terminal block connections are to be made through openings in the remote enclosure if used. FCI
strongly recommends that all electrical cables be run through an appropriate conduit for the protection of the
instrument and personnel if a remote enclosure is used.
Protection of the control circuit from moisture is an important consideration. Keep the entry of the conduit into
the enclosure in the downward direction so condensed moisture that collects in the conduit will not drain into the
enclosure. In addition, FCI recommends sealing off the conduit with a potting Y or other sealing method to
prevent moisture from entering the remote enclosure if used.
Minimum Wire Size
Table 2-1 shows the smallest (maximum AWG number) copper wire that is to be used in the electrical cables for
connecting the instrument to the customer alarms and power. Use a lower gauge of wire for less of a voltage drop.
Contact FCI concerning greater distances than those listed in the table.
Table 2-1. Interconnecting Cable Size (AWG)
Maximum Distance for AWG
Connection 10ft. 50 ft. 100 ft 250 ft. 500 ft. 1000 ft.
(3m) (15m) (31 m) (76m) (152m) (305m)
Input Power 22 22 22 20 18 16
Relay 24 22 20 16 12 10
Cable Connections
Caution: In order to prevent circuit or component damage, remove the control circuit from the remote
enclosure (if present) prior to the pulling of conduit wire.
Note: The installation of an AC line switch between the AC power source and the instrument is
recommended. This facilitates easy power disconnection and is an added safety feature.
Unplug the control circuit from it's socket by pulling up on the transformer in the center of the circuit. Then
connect the relay outputs to the customer alarms. Also connect the power to the instrument power input. See
Appendix A for the appropriate connection information.
Replace the control circuit. Be sure any customer supplied gaskets, O-rings, seals or washers are correctly
installed to prevent moisture from getting on the control circuit.