Page 19
FW_B-SMART_v0306-01_EN.docx
4.5
ELECTRICAL INSTALLATION
DO NOT OPEN AN INSTALLED ENCLOSURE WHEN CIRCUITS ARE ALIVE.
•
Electro static discharge does inflict irreparable damage to electronics! Before installing or
opening the B-SMART, the installer has to discharge himself by touching a well-
grounded object.
•
The B-SMART must be installed in accordance with the EMC guidelines (Electro
Magnetic Compatibility).
•
Use (separate) cable glands with effective IP65 (or better) seals for all wires.
•
For unused cable entries, fit blind plugs with effective IP65 (or better) seals.
•
Use effective screened cable for the input/output signals and provide grounding of its screen to
the “┴ “ terminal (for isolated signals the corresponding – terminal) or at the external device
itself, whichever is appropriate to the application. Be careful not to create ground loops!
•
The cable entry plugs mounted into the enclosure shall comply with the requirements of the type
of protection used.
4.5.1
ELECTRICAL SAFETY
•
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 IEC 61010-1. All other inputs and outputs shall at least be
reinforced insulated from mains.
•
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. Within
Canada all field wiring must conform to the Canadian Electrical Code for installations within
Canada.
4.5.2
SENSOR SUPPLY VOLTAGE
Terminal 3: Reference voltage: 1.2V DC - 3.2V DC
Terminal 3 provides a reference voltage of 3.2 V DC (coil signals 1.2V) which functions as a limited
supply voltage for the signal output of the flowmeter.
This voltage MAY NOT be used to power 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).
Terminal 4: Sensor supply: 8.2V DC
This terminal offers a supply derived from the input supply. The output voltage of terminal 4 is a fixed
8.2V DC.
The 8.2V DC sensor supply requires an input voltage of 11-27V.
Maximum output current: 10mA.
