Kobold Heinrichs Coriolis Mass Flow Meter, Инструкция по установке и эксплуатации

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Heinrichs Messtechnik GmbH
Page 18 of 118 OPERATING MANUAL TMU-W / UMC4
Pressure surges
Pressure surges in a pipe could be provoked by a sudden decrease in flow caused by rapid closing of a valve
or similar factors. This change in pressure can lead to under-pressure downstream from a valve that has
been closed rapidly, and to outgassing. If the valve is mounted directly on the inlet section of the flowmeter,
a gas bubble can form in the flow tube that can cause a measuring signal disturbance that would shift the
zero point of the output signal. In extreme cases, a pressure surge could cause mechanical damage to the
sensors and/or flow tube.
Whenever possible, quick-closing valves should be mounted downstream from the sensor. If this is not
feasible, such valves are to be mounted a minimum of 10 x DIA (
Φ
) ) from the nearest sensor. Alternatively,
valve closing speed can be reduced.
Using the device with hazardous fluids
The sealing technology used in the TMU-W mass flowmeters connector plug renders the device unsuitable
for use with hazardous fluids. Only sensors that meet the standards for safety instruments are suitable for
use with hazardous fluids.
In the case of welded components, a coloured liquid penetration test can be performed on the welds, or the
first seam of the weld can be x-rayed.
Vibration stability
The sensors are insensitive to vibration. Vibration stability has been validated in accordance with
DIN IEC 68-2-6, for up to 1 g at 10 to 150 Hz.
If pipe vibration is greater than 1 g in the 5-2000 Hz range, additional supports shall be mounted such as
depicted in the following images. Such supports will prevent vibration from affecting the device’s
mechanical configuration and/or measurement readings.
Image 1: Wall mounted supports Image 2: Floor-mounted supports