Moisture; Measuring Pipes - ABB 265DS Operating Instruction

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4.4

Moisture

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Use suitable cables and tighten cable glands securely. The transmitter can also be protected
against the ingress of moisture by routing the connecting cable downward before securing it.
This allows rain and condensation to drip down. This is especially important for installation in
outdoor areas and rooms that are exposed to moisture (e.g., due to cleaning processes) or on
cooled or heated tanks.
Fig. 6: Steps for preventing the ingress of moisture
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4.5

Measuring pipes

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In order for the pipes to be laid correctly, the following points must be observed:
• The measuring pipes must be as short as possible and free from sharp bends.
• Lay the measuring pipes in such a way that no deposits can accumulate in them. Gradients
should not be less than approx. 8 % (ascending or descending).
• The measuring pipes should be blown through with compressed air or, better yet, flushed
through with the measuring medium before connection.
• Where a fluid/vaporous measuring medium is being used, the liquid in both measuring pipes
must be at the same level. If a separating liquid is being used, both measuring pipes must be
filled to the same level (265Dx).
• Although it is not absolutely necessary to use balancing vessels with vaporous measuring
media, measures must be taken to prevent steam entering the measuring chambers of the
measuring equipment (265Dx).
• It may be necessary to use condensate vessels, etc., with small spans and vaporous
measuring media (265Dx).
• If using condensate vessels (steam measurement), you should ensure that the vessels are
at the same height in the differential pressure lines (265Dx).
• As far as possible, keep both measuring pipes at the same temperature (265Dx).
• Completely depressurize the measuring pipes if the medium is a fluid.
• Lay the measuring pipes in such a way that gas bubbles (when measuring fluids) or
condensate (when measuring gases) can flow back into the process line.
• Ensure that the measuring pipes are connected correctly (+ and - pressure sides connected
to measuring equipment, seals, etc.).
• Make sure the connection is tight.
• Lay the measuring pipes in such a way that prevents the medium from being blown out over
the measuring equipment.
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IM/265D/V-EN-02 265Dx, 265VS
Mounting
M00387
27