VEGA VEGAFLEX 83 4 … 20 mA_HART - four-wire Polished version - Manual (Page 20)

20
4 Mounting
VEGAFLEX 83 • 4 … 20 mA/HART - four-wire
41840-EN-130314
Fig. 11: Mounting of the sensor with inflowing medium
The reference plane for the measuring range of the sensors is the
sealing surface of the thread or flange.
Keep in mind that a min. distance must be maintained below the refer-
ence plane and possibly also at the end of the probe - measurement
in these areas is not possible (dead band). The length of the cable
can be used all the way to the end only when measuring conductive
products. These blocking distances for different mediums are listed
in chapter "Technical data". Keep in mind for the adjustment that the
default setting for the measuring range refers to water.
The process fitting must be sealed if there is gauge or low pressure in
the vessel. Before use, check if the seal material is resistant against
the measured product and the process temperature.
The max. permissible pressure is specified in chapter "Technical
data" or on the type label of the sensor.
For use in an autoclave, e.g. for sterilization, the VEGAFLEX 83 is
available as autoclaved version.
Hence you can separate the housing from the process fitting.
Open the slotted nut with a hook wrench and remove the housing in
an upward direction.
The side of the process fitting must be covered with a lid after the
housing is removed. Screw the enclosed lid with slotted nut onto the
instrument side of the process fitting and tighten the nut with a torque
of 20 Nm.
Make sure that no liquid or contamination penetrates into the housing
or the process side.
After autoclaving, screw the lid off again and place the housing verti-
cally on the side of the process fitting. Tighten the slotted nut with a
torque of 20 Nm.
Measuring range
Pressure
Autoclaved version