Siemens SITRANS LG270 Operating Instructions Manual page 15

Measuring range
Pressure
Fasten
PBD-51041071
Fig. 5: 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). These dead bands 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.
If there is a risk of the coaxial probe touching the vessel wall during
operation due to product movements or agitators, etc., the measuring
probe should be securely fixed.
Avoid undefined vessel connections, i.e. the connection must be
either grounded reliably or isolated reliably. Any undefined change of
this condition can lead to measurement errors.
If there is a danger of the coaxial probe touching the vessel wall, then
the probe must be fastened at the bottom end.
Keep in mind that measurement is not possible below the fastening
point.
SITRANS LG270 - Operating Instructions
15