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FW-F103-P-XN-M_v2002_03_EN.docx
4.5.3 FIELD WIRING CONNECTIONS
When installing the F103-P in a hazardous area, do NOT install any wiring unless the
area has been declassified or is known to be non-hazardous.
• Do ground the aluminum / stainless steel enclosure properly with a PE wire as indicated
to the Protective Earth terminal. It is the responsibility of the installer to install, connect
and test the Protective Earth connections in accordance with the local and (inter)national
Rules and Regulations.
• When a power supply is connected to the field wiring connections, please also consider
the demands for power supply wiring shown in paragraph 4.5.4.
• The installation must comply with (inter)national requirements and local ordinances.
Within the United States all field wiring must conform to the National Electric Code, NFPA
70, Article 501-4(b). Within Canada all field wiring must conform to Section 18-156 of the
Canadian Electrical Code.
All field wiring enters the F103-P through the bottom of the enclosure and connects to the circuit
assembly inside the enclosure door. Wiring is routed through cable glands or up to two conduit hubs.
Please make sure to order the F103-P with the correct drilling pattern and thread (metal) or hole
(plastic) sizes.
The wire screens (shield) are meant to prevent electromagnetic interference and shall be terminated
at one side to prevent ground loops. Connection of the screen can either be made to the common
ground terminal or at the sensor itself, whichever is appropriate to the application.
Inside of the Fluidwell unit, the various common ground terminals are connected to each other. It is
advised to terminate the wire screens in the vicinity of the sensor and to insulate the wire screen
with a shrink tube at the F103-P side.
4.5.4 POWER SUPPLY WIRING
• In case this instrument is connected to a supply by means of a permanent connection a
switch or circuit-breaker shall be included in the installation. This shall be in close
proximity to the equipment and within easy reach of the operator. It shall be marked as the
disconnecting device for the equipment. Furthermore, a protective over-current device with
a maximum rating of 0.5A (e.g. fuse or circuit breaker) must be inserted in the positive
supply line in safe area.
• The external power supply must be an approved ELV source, insulated from AC mains by
double / reinforced insulation per CSA C22.2 No. 61010-1 / UL61010-1.
The F103-P can be powered from an extern power supply or via the isolated 4-20mA current loop.
An internal power supply is also available in the form of a lithium battery. When both external and
internal power supplies are available, the internal power supply is interrupted and will act as a
backup supply. Note that the optional backlight only works with the external power supply option PX.
4.5.5 SENSOR SUPPLY
For type PB / PX / AH
There is no real sensor supply out available. Only a limited power supply is available. This power
supply MAY NOT be used to supply the flowmeters electronics, converters etc. as it will not provide
adequate sustained power ! All energy used by the flowmeters pick-up will directly influence the
battery life-time. It is strongly advised to use a "zero power" pickup such as a coil or reed-switch
when operating without external power. It is possible to use some low power NPN or PNP output
signals, but the battery life time will be significantly reduced (consult your distributor). The sensor
supply is fixed: 1.2V DC or 3V DC (set by firmware).
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