Proline Prowirl 73 Installation
Endress+Hauser 19
3.2.4 Heat insulation
Some fluids require suitable measures to avoid heat transfer at the sensor to ensure optimum
temperature measurement and mass calculation. A wide range of materials can be used to provide
the required insulation.
When insulating, please ensure that a sufficiently large area of the housing support is exposed. The
uncovered part serves as a radiator and protects the electronics from overheating (or undercooling).
The maximum insulation height permitted is illustrated in the diagrams. These apply equally to both
the compact version and the sensor in the remote version.
A0001868
Fig. 6: 1 = Flanged version, 2 = Wafer version
"
Caution!
Danger of electronics overheating!
• Always keep the adapter between the sensor/transmitter and the connection housing of the
remote version free of insulating material.
• Note that a certain orientation might be required, depending on the fluid temperature (ä 18).
• Observe information on the permissible temperature ranges (ä 84).
m
In the case of liquids, there should be upward flow in vertical pipes to avoid partial pipe filling (Fig. A).
"
Caution!
Disruption in flow measurement!
To guarantee the flow measurement of liquids, the measuring tube must always be completely full in pipes with
vertical downward flow.
n
"
Caution!
Danger of electronics overheating!
If fluid temperature is 200 °C (392 °F), orientation B is not permitted for the wafer version (Prowirl 73W) with
nominal diameters DN 100 (4") and DN 150 (6").
In order to ensure that the maximum permissible ambient temperature for the transmitter is not exceeded (ä 84), we
recommend the following orientations:
o
In the case of hot fluids (e.g. steam or fluid temperature (TM) 200 °C (392 °F)): orientation C or D
p
In the case of very cold fluids (e.g. liquid nitrogen): orientation B or D
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