Proline Promass 84F
Hauser
17
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.
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High-temperature version: maximum insulation thickness of 60 mm (2.4") 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.
Zero point adjustment
All measuring devices are calibrated with state-of-the-art technology. The zero point determined in this way is
imprinted on the nameplate of the device. Calibration takes place under reference operating
conditions
→
ä
10. Consequently, the zero point adjustment is generally
not
necessary for Promass!
Experience shows that the zero point adjustment is advisable only in special cases:
• To achieve highest measuring accuracy also with very small flow rates.
• Under extreme process or operating conditions (e.g. very high process temperatures or very high viscosity
fluids).
Inlet and outlet runs
There are no installation requirements regarding inlet and outlet runs.
Length of connecting cable
max. 20 m (65 ft), remote version
System pressure
It is important to ensure that cavitation does not occur, because it would influence the oscillation of the
measuring tube. No special measures need to be taken for fluids which have properties similar to water under
normal conditions.
In the case of liquids with a low boiling point (hydrocarbons, solvents, liquefied gases) or in suction lines, it is
important to ensure that pressure does not drop below the vapour pressure and that the liquid does not start
to boil. It is also important to ensure that the gases that occur naturally in many liquids do not outgas. Such
effects can be prevented when system pressure is sufficiently high.
Consequently, it is generally best to install the sensor:
• downstream from pumps (no danger of vacuum),
• at the lowest point in a vertical pipe.
Esc
E
-
+
mm (inch)
max.
60
(2.4)
max.
60
(2.4)
