Flow Transmitter Wiring; Cautions In Wiring; Applicable Wires; Treatment Of Wiring Port - Fuji Electric FSJ Instruction Manual

Cautions in wiring

Use a dedicated signal cable (FLYE) for the signal cable between the pre-amplifier unit and flow
transmitter (FSJ). Furthermore, do not connect a relay cable to any part of the dedicated signal cable.
Be sure to pass the dedicated signal cable between the pre-amplifier unit and flow transmitter along a
metal conduit.
To avoid inductive interference, do not pass the cable along the conduit together with the power cable.
Try as best as possible to use shielded wire for the input/output signal cable.
To prevent noise intrusion, do not run the signal cable inside the same duct as that used for wires such as
power lines.
If the power cable has an integrated ground wire, ground it as is.
This instrument is not equipped with a power switch, and therefore a separate switch or breaker must be
installed for each flowmeter.
Furthermore, please observe the following in order to comply with safety standards.
• Integrate the switch or breaker into the equipment.
• Locate the switch or breaker appropriately, and ensure that they can be easily accessed.
• Clearly indicate that the switch or breaker is an equipment disconnecting device.
• Use a switch or breaker that conforms to local standards in the region in which they are used, or to
international standards.
Seal up wiring ports that are not used with the sealing caps provided.
Connect a load resistor of 500 Ω or less to ensure a stable maximum output current of 120%.
If greater than 500 Ω, but less than or equal to 600 Ω, the maximum stable current that can be output will
be 105% (20.8 mA).

Applicable wires

Use the following cables.
 Power cable
 Input/Output signal cable
Dedicated signal cable
 Extension cable for resistance bulb:
 Communication cable

Treatment of wiring port

The casing of the flow transmitter is IP67. However, if installed in a humid place, the wiring ports must be made airtight to
avoid ingress of moisture, condensation, etc. Be sure to use the waterproof glands furnished with the instrument in order to
ensure the waterproof means. A gland, which is not ready to be used, should be sealed by supplied cover.
Do not install the instrument where there is a risk of flooding. Otherwise, it may cause electric shock or
malfunction.

3.4. Flow transmitter wiring

: 3-wire or 2-wire cabtyre cable (allowable temperature: 70°C or higher)
Nominal sectional area 0.75mm
Outside diameter
: 2-wire or multi-wire cabtyre cable as required (allowable temperature: 70°C or higher)
Outside diameter
: cable between pre-amplifier and flow transmitter based on type designation
(Type: FLYE) High-frequency coaxial double-shielded cable with characteristic
impedance of 50 Ω (allowable temperature: 70°C or higher)
With waterproof connector
Finished outer diameter: ø 11.5 mm
3-wire or multi-wire cabtyre cable as required (allowable temperature: 70°C or higher)
Nominal sectional area 0.75mm2 or more
Outside diameter
: Twisted pair cable with shield (for RS-485) (allowable temperature: 70°C or higher)
Outside diameter
－15－
2
or more
ø9.5 to ø 11mm
ø 9.5 to ø 11mm
ø 9.5 to ø 11mm
ø 8.8 to 10mm