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FW-F018-P-M_v0404_01_EN.docx
5.2.6
POWER SUPPLY WIRING
The F018-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 an external power supply.
The following types of power supply are available for hazardous area:
•
Type PX / PD
: As standard, all intrinsically safe products are supplied with terminal 4 and 5 to
power the product externally.
•
Type PC:
Offers an internal intrinsically safe lithium battery.
This ATEX / IECEx certified battery (FW-LiBAT) may be replaced in hazardous
area, but only with a new certified FW-LiBAT battery. (See paragraph 6.3).
5.2.7
SENSOR SUPPLY
For type PC / PX
– Terminal 3: limited sensor supply
These types of power supply only offer 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. 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.
