Proline Promass Q 300
Hauser
47
For information on the dimensions: see the "Mechanical construction" section → 49
Rupture disk
To increase the level of safety, a device version with a rupture disk with a trigger pressure of … can
be used (order code for "Sensor option", option
CA
"rupture disk").
Special mounting instructions: → 41
For information on the dimensions: → 58
Flow limit
Select the nominal diameter by optimizing between the required flow range and permissible pressure
loss.
For an overview of the full scale values for the measuring range, see the "Measuring range"
section
• The minimum recommended full scale value is approx. 1/20 of the maximum full scale value
• In most applications, 20 to 50 % of the maximum full scale value can be considered ideal
• A low full scale value must be selected for abrasive media (such as liquids with entrained solids):
flow velocity < 1 m/s (< 3 ft/s).
Pressure loss
To calculate the pressure loss, use the
Applicator
System pressure
It is important that cavitation does not occur, or that gases entrained in the liquids do not outgas.
This is prevented by means of a sufficiently high system pressure.
For this reason, the following mounting locations are recommended:
• At the lowest point in a vertical pipe
• Downstream from pumps (no danger of vacuum)
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Thermal insulation
In the case of some fluids, it is important that the heat radiated from the sensor to the transmitter is
kept to a minimum. A wide range of materials can be used for the required insulation.
NOTICE
Danger of overheating with insulation
‣
Ensure that the temperature at the lower end of the transmitter housing does not exceed
80 °C (176 °F)
NOTICE
The insulation can also be thicker than the maximum recommended insulation thickness.
Prerequisite:
‣
Ensure that convection takes place on a sufficiently large scale at the transmitter neck.
‣
Ensure that a sufficiently large area of the housing support remains exposed. The uncovered part
serves as a radiator and protects the electronics from overheating and excessive cooling.
t
a
A0028853
t
Maximum insulation thickness
a
Minimum distance to insulation