VEGA VEGADIF 34 … 51 - Manual (Page 21)

VEGADIF 34 … 51 21
20094-EN-030731
Mounting
2 Mounting
2.1 Checking the operating
conditions
VEGADIF is a rugged transmitter for precise
differential pressure, level and flow measure-
ment. The accuracy of the measurement
mainly depends on the correct installation and
connection of differential pressure lines.
Detailed information on differential pressure
measurement in corrosive products as well as
further information on wiring and coordination
of valves, measuring lines and components is
provided in the VDI/VDE regulations 3512 as
well as DIN 19 201 and DIN 1952. Further
information on level measurement is stated in
the VDI/VDE regulations 3519.
The implemented differential pressure trans-
mitter must meet the technical and safety
requirements of the application. For this rea-
son, double-check the type plate, calibration
plate and order code regarding the following
data:
Nominal pressure
The nominal pressure rating of VEGADIF must
be above the operating pressure of the proc-
ess.
Measuring range
The measuring range is calibrated (factory
setting) according to the order data. The
pressure values adjusted for zero and span
are documented on the calibration plate. The
values must cover the application. If an adap-
tation is necessary, this should be carried out
acc. to section 4 Set-up.
Materials of wetted parts
The materials of wetted parts must be suffi-
ciently resistant. Use the respective material
tables to check this. A table is provided in the
product information manual of VEGADIF, for
more information we recommend the VEGA
resistance lists.
Ambient temperature
The ambient temperature at the installation site
must be in the range of -40°C … +85°C. The
surface temperature of the electronics housing
must not exceed +85°C. It is therefore impor-
tant to make sure that the temperature of the
electronics housing does not go above +85°C
through radiated heat from neighbouring
instruments or other system equipment. If
there is the danger of this happening,
VEGADIF should be protected against this
heat radiation. If temperatures below
-40°C are expected at the installation, the
transmitter should be installed in a tempera-
ture insulated and heatable protective box. If
there is the danger of medium or condensate
freezing in the process connection or on the
measuring cell, the transmitter must be in-
stalled in a warmer place or in a heatable
protective box for the process connections
and process seals. Similar measures should
be taken to protect the pressure lines.
Product temperature
The permissible product temperature de-
pends on the process seal, the measuring cell
and the isolating liquid. When VEGADIF 45 or
51 are used, note that the product tempera-
ture can differ between plus and minus side.
Humidity
Mount horizontally installed instruments with
the cable entry pointing downward, in order to
avoid moisture ingress. To facilitate this, the
sensor housing can be rotated by approx.
350°. With vertically installed instruments, loop
the connection cables in a bow pointing down-
ward towards the instrument housing, so that
rain and condensation water can drain off.
This applies particularly when mounting out-
doors, in humid areas (e.g. by cleaning proc-
esses) or on cooled or heated vessels.