Endress+Hauser HART Proline Promass 83, Руководство по эксплуатации

Страница: 20 / 148

Installation Proline Promass 83
20 Hauser
• When using electrical heat tracing whose heat is regulated using phase control or by pulse
packs, it cannot be ruled out that the measured values are influenced by magnetic fields
which may occur, (i.e. at values greater than those permitted by the EC standard (Sinus 30
A/m)). In such cases, the sensor must be magnetically shielded.
The secondary containment can be shielded with tin plates or electric sheets without
privileged direction (e.g. V330-35A) with the following properties:
– Relative magnetic permeability
μ
r
≥
300
– Plate thickness d
≥
0.35 mm (0.014")
• Information on permissible temperature ranges
→
132
• Promass X: Especially under critical climatic conditions it has to be ensured that the
temperature difference between environment and measured medium does not exceed 100
K. Suitable measures, such as heating or thermal insulation, are to be taken.
Special heating jackets which can be ordered as accessories from Hauser are
available for the sensors.
3.2.6 Thermal insulation
Some fluids require suitable measures to avoid loss of heat at the sensor. A wide range of
materials can be used to provide the required thermal insulation.
a0004614
Fig. 14: In the case of the Promass F high-temperature version, a maximum insulation thickness of 60 mm (2.4") must be
observed in the area of the electronics/neck.
If the Promass F high-temperature version is installed horizontally (with transmitter head
pointing upwards), an insulation thickness of min. 10 mm (0.4") is recommended to reduce
convection. The maximum insulation thickness of 60 mm (2.4") must be observed.
3.2.7 Inlet and outlet runs
There are no installation requirements regarding inlet and outlet runs. If possible, install the
sensor well clear of fittings such as valves, T-pieces, elbows, etc.
3.2.8 Vibrations
The high oscillation frequency of the measuring tubes ensures that the correct operation of
the measuring system is not influenced by pipe vibrations. Consequently, the sensors require
no special measures for attachment.
3.2.9 Limiting flow
Relevant information can be found in the "Technical Data" section under "Measuring range"
→
106 or "Limiting flow"
→
134.
max. 60 (2.4)
max. 60 (2.4)