Endress+Hauser Proline Promass H 300 PROFINET Operating Instructions Manual page 24

Installation
24
Thermal insulation
In the case of some fluids, it is important to keep the heat radiated from the sensor to the
transmitter to a low level. A wide range of materials can be used for the required
insulation.
The following device versions are recommended for versions with thermal insulation:
Version with extended neck:
Order code for "Measuring tube material", option DA or EA with an extended neck length of
105 mm (4.13 in).
NOTICE
Electronics overheating on account of thermal insulation!
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Recommended orientation: horizontal orientation, transmitter housing pointing
downwards.
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Do not insulate the transmitter housing .
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Maximum permissible temperature at the lower end of the transmitter housing:
80 °C (176 °F)
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Thermal insulation with extended neck free: We recommend that you do not insulate
the extended neck in order to ensure optimum dissipation of heat.
 6 Thermal insulation with extended neck free
Heating
NOTICE
Electronics can overheat due to elevated ambient temperature!
‣
Observe maximum permitted ambient temperature for the transmitter .
‣
Depending on the fluid temperature, take the device orientation requirements into
account .
NOTICE
Danger of overheating when heating
‣
Ensure that the temperature at the lower end of the transmitter housing does not
exceed 80 °C (176 °F).
‣
Ensure that sufficient convection takes place at the transmitter neck.
‣
Ensure that a sufficiently large area of the transmitter neck remains exposed. The
uncovered part serves as a radiator and protects the electronics from overheating and
excessive cooling.
‣
When using in potentially explosive atmospheres, observe the information in the
device-specific Ex documentation. For detailed information on the temperature tables,
see the separate document entitled "Safety Instructions" (XA) for the device.
Heating options
If a fluid requires that no heat loss should occur at the sensor, users can avail of the
following heating options:
• Electrical heating, e.g. with electric band heaters
• Via pipes carrying hot water or steam
• Via heating jackets
Proline Promass H 300 PROFINET
Endress+Hauser
A0034391