68
UTD.123.2019-10.00_EN
11.6 - Flow gauge BFS-20
II 1 G Ex ia IIB T100°C IP6X
II 1 D Ex ia IIIB T100°C IP6X
It's a capacity control device.
The measurement is executed through a piston movement equipped with
loaded spring, free to flow inside a cylindrical pipe. The piston movement
depends from device calibrating and from its minimum and maximum
setup capacity. This device is equipped with viscosity compensation
system.
Running features:
– Circuit voltage
U
= 28 V;
– Circuit current
i
= 50 mA;
– Supply 45 V - 1 A;
– Electrical connection to DIN 43650;
– Maximum pressure
P
= 10 bar;
– Maximum temperature
T
= 120 °C;
– Viscosity compensation from 30 to 600 cSt;
– Capacity measurement range 2 - 90 l/min;
– IP 65 protection;
– Connection 3/4" G or 1" G.
Setting
The flow gauge must be set for a minimum level equivalent to 70 % of
capacity. During the running it is necessary to verify the correct setting
of the device. If any problems occur during this operation contact Rossi.
Installation and maintenance
The flow gauge must be installed and maintained according to installation and maintenance rules for
environments classified against the risk of explosion for gas presence (example: EN 60079-14, EN 60079-
17 etc.).
The instrument can be mounted in whatever position but in order to execute a careful measurement it is
necessary to mount it in vertical direction and that the flow traverses it from the bottomo to the top.
ùThe oil must be pollution particles free, otherwise the instrument could not operate properly; install an oil
filter or a magnetic filter, in order to avoid this problem.
The device must be installed far away from inductive or magnetic fields and at a minimum distance of the
iron parts of 10 mm.
During the assembly of the device, avoid rotating the electrical connections inside the tabular hose in order
to avoid any damage to the instrument.
Pre-arrange suitable protections against electrical overloads.
Adjust the switching point according to the measurement range so that the contact is open when the
capacity achieves the minimum setup point.
The flow gauge, if used properly according to its mechanical and electrical features specified, does not
need any careful maintenance, but it is recommended to do a specific check every 6 months in order to
control the correct running as per table 14.3.
Protect the probe body from any external impact.
The probe body must be earth connected.
In any case, refer to the installation and maintenance instructions; consult us, if need be.
