FS10 Series
INSTALLATION
Fluid Components International LLC
5
Instrument Wiring
Only qualified personnel are to wire or test this instrument. The operator assumes all responsibilities for safe practices while wiring or troubleshoot-
ing. One of the following wiring instruction and diagrams illustrate the requirements for power input, alarm and analog outputs and safety instruc-
tions for the unit being installed.
Caution:
The instrument contains electrostatic discharge (ESD) sensitive devices. Use standard ESD precautions when handling the
instrument.
Recommended Minimum Wire Gauge
The following wire gauge chart specifies the correct wire for the distance to the power source or loads. For best results from the open collec-
tor output, use shielded cable (50 ft. max.) and route it separately from the power source or relay load.
Table 1 – I/O Wiring Gauge vs. Distance
Connection
Maximum Diameter (Gauge)
10’
50’
100’
250’
500’
1000’
(3 m)
(15 m)
(30 m)
(76 m)
(152 m)
(305 m)
Input Power (24 VDC nominal)
24
24
22
22
20
18
Relay Output (1 amp contacts)
18
16
14
12
10
X
Open Collector Output
24
22
X
X
X
X
4-20 mA Output
24
24
22
22
20
18
Grounding
Properly connect the switch to earth ground for safety and operational reasons.
The circuit board is tied to the enclosure case internally and both are tied to the probe assembly. If the installation pipe or vessel is not prop-
erly grounded, connection to earth ground may be connected at the output connector, i.e. M12 or cable pigtail. Use the recommended wire
gauge specified for the input power and distance listed in the chart above.
Do not connect the earth ground to DC ground (terminals
are marked “GND”, "RTN", “COM” or “–”).
Input Power, 24 VDC
FCI recommends installing an input power disconnect and a fuse near the instrument to interrupt power during installation, maintenance,
calibration, alarm selection and troubleshooting procedures. Install conduit according to the local electrical codes or hazardous location
requirements.
Attach the power leads according to the Input/Output connection schematic on the following page. If the unit has an M12 interface, verify
that the mating connector pin numbers match the designations of the wiring diagram. If the unit is supplied with a cable pigtail, connect the
flying leads via an approved terminal block or connector in an electrically safe and approved conduit box.
Attach the wires to the relay and other functions as needed. The relay contact conditions are shown in the alarm state (de-energized). The relay’s
maximum rating is 1 A @ 24 VDC/120 VAC (FM only), 24 VDC (ATEX), resistive loads.
Refer to “3. OPERATION” on page 23 for details on setpoint and alarm state settings.