FCI FLT93B, Installation, Operation & Maintenance Manual

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INSTALLATION FLT
®
Series FlexSwitch
TM
8 Fluid Components International LLC
Sanitary Assembly (FLT93C)
The instrument is inserted into the process connection with removable clamp fittings. The Removable Clamp (RC) sanitary assembly contains
a removable clamp connection to the flow element. The Clean-In-Place (CIP) sanitary assembly has the flow element directly welded into the
process stand pipe. Otherwise these instruments function exactly the same as an FLT93F or FLT93S. See Appendix A for outline dimensions of
the instruments. Figure 2-4 also shows the sanitary assemblies.
Install and Wire the Enclosure(s)
Warning: In applications where the sensing element is located in an explosive environment, isolate the conduit before it leaves the
environment. A silicone encapsulant/potting compound can be used to provide the isolation.
Install an input power disconnect switch and fuse near the instrument to interrupt power during installation and
maintenance. Always disconnect/shut-off power before wiring.
Caution:
Pulling wires can cause damage to the control circuit. Therefore, remove the control circuit from the enclosure and use
extreme care when pulling wires into the enclosure.
Mount and wire the control circuit either locally or remotely (option) by following the local or remote enclosure procedure below.
Disconnect Device
IEC 61010-1 requires the installation of an external switch or circuit breaker on the 120/220 VAC power source. It is recommended that the
switch or the circuit breaker be in close proximity to the flow switch and within easy reach of the operator. The recommended breaker trip
value for 120/220 VAC is 3 amps. If 24 VDC/VAC input power is being used a disconnect switch or breaker is also recommended. Recom-
mended breaker value is 3 amps. All disconnect devices shall be clearly marked for the flow switch.
Minimum Wire Size
Table 2-1 shows the smallest (maximum AWG number) copper wire that is 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 table. The sensing element cable must be shielded. If the
cable is spliced the shield wire must be continued through the splice. If a terminal block is used, the shield must have its own terminal.
Enclosures Covers
All enclosure covers must be in place and securely closed to achieve environmental and safety classifications.
Tighten all circular thread-on covers about 1 full turn past hand tight.
Cover locks must be in place and secure if required by a particular approval.
Note:
Nitrile (buna-N) O-rings are standard on the circular thread covers. These O-rings have a 250 °F (121 °C) maximum usage
temperature.
A Viton O-ring [400 °F (204 °C) max. temp.] is available for the thread-on covers.
To receive a Viton O-ring, provide FCI with the following information:
• Shipping address
• Quantity required
• Desired P/N:
Use P/N 000391-01 for the single conduit port enclosure (Local)
Use P/N 000391-07 for the dual conduit port enclosure (Remote)
Figure 2-4 FLT93C Sanitary Flow Elements (RC and CIP)