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FW-F018-P-M_v0404_01_EN.docx
4.5.4
POWER SUPPLY WIRING
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 / EN/IEC 61010-1.
The F018-P can be powered from an external 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 an external power supply.
4.5.5
SENSOR SUPPLY
For type PB / PX
– Terminal 3: limited sensor supply
With these types of power supply, there is no real sensor supply output available but only a limited
power supply. This power supply SHOULD 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 at terminal 3 is fixed to 1.2V DC for coil type inputs and 3.2V DC for
all other types of flowmeter inputs (set by firmware).
For type PD - Terminal 6: sensor supply 8.2V
Besides offering the limited sensor supply on terminal 3 (see above), type PD also offers a real
sensor supply of 8.2V DC, for example to power a Namur sensor, on terminal 6.
4.6
TERMINAL CONNECTORS SAFE AREA APPLICATIONS
– TYPE PB / PX / PD
Take careful notice of all safety and precautionary measures indicated in paragraph
4.5: Electrical Installation and review paragraph 4.5.3 and 4.5.4 before applying any
field or power supply wiring.
For Intrinsically Safe applications: read chapter 5.
Following terminal connectors are available on the F018-P when supplied with Type PB / PX / PD:
Fig. 14: Overview of terminal connectors F018-P
– type PB / PD / PX
P
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CR: AH + HART Communication
