Endress+Hauser HART Proline t-mass I 300, Руководство по эксплуатации

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Installation Proline t-mass I 300 HART
26 Hauser
System pressure
Pressure-reducing valves and some compressor systems can generate significant process
pressure variations that can distort the flow profile. This can produce an additional
measured error. Suitable measures must be taken to reduce these pressure pulses, such as:
• The use of expansion tanks
• The use of inlet diffusers
• Positioning the measuring device further downstream
To avoid pulsating flow and contamination from oil/dirt in compressed air applications, it
is recommended to install the measuring device downstream of filter, drying and storage
devices. Do not install the measuring device directly after the compressor.
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.
If the gas is very wet or saturated with water (e.g. digester gas), the pipe and the sensor
housing should be insulated, and heated where necessary, to prevent water droplets
condensing on the sensing element.
NOTICE
Electronics overheating on account of thermal insulation!
‣
Recommended orientation: horizontal orientation, transmitter housing pointing
downwards.
‣
Do not insulate the transmitter housing .
‣
Maximum permissible temperature at the lower end of the transmitter housing:
80 °C (176 °F)
‣
Thermal insulation with not isolated extended neck: We recommend that you do not
insulate the extended neck in order to ensure optimum dissipation of heat.
A0039420
 14 Thermal insulation with not isolated extended neck
Heating
NOTICE
Electronics can overheat due to elevated ambient temperature!
‣
Observe maximum permitted ambient temperature for the transmitter.
‣
Depending on the medium temperature, take the device orientation requirements into
account.
NOTICE
Electronics overheating on account of thermal insulation!
‣
Recommended orientation: horizontal orientation, transmitter housing pointing
downwards.
‣
Do not insulate the transmitter housing .
‣
Maximum permissible temperature at the lower end of the transmitter housing:
80 °C (176 °F)
‣
Thermal insulation with extended neck free: We recommend that you do not insulate
the extended neck in order to ensure optimum dissipation of heat.