Deltabar S
Endress+Hauser 23
Operating conditions (Installation)
General installation
instructions
• The position-dependent zero shift can be corrected directly at the device via operating key, for devices with
external operation even in hazardous areas. Diaphragm seals also shift the zero point, depending on the
installation position ( ä 64 ff, "Installation instructions").
• The housing of the Deltabar S can be rotated up to 380°. ä 26, section "Turn the housing".
• Endress+Hauser offers a mounting bracket for installing the device on pipes or walls. ä 24, section "Wall-
and pipe-mounting".
• When measuring in media with solid proportions, such as dirty liquids, installing separators and drain valves
is useful for capturing and removing sediment.
• Using a three-valve or five-valve manifold allows for easy commissioning, installation and maintenance
without interrupting the process.
• General recommendations for the impulse piping can be found in DIN 19210 "Methods for measurement of
fluid flow; differential piping for flow measurement devices" or the corresponding national or international
standards.
• Install the impulse piping with a continuous gradient of at least 10%.
• When routing the impulse piping outdoors, ensure that sufficient anti-freeze protection is used, e.g. by using
pipe heat tracing.
• For FMD77 and FMD78: See page 64 ff, "Installation instructions, Diaphragm seal systems" section.
Measuring arrangement Flow measurement
• The PMD70 and PMD75 are best suited to flow measurement.
• Measuring arrangement for gases: Mount device above the measuring point.
• Measuring arrangement for liquids and vapours: Mount device below tapping point.
• For flow measurement in vapours, mount the condensate traps at the same level as the same the tapping
point and at the same distance from Deltabar S.
Level measurement
• PMD70, PMD75, FMD76 and FMD77 are best suited to level measurement in open tanks. All Deltabar S
devices are suitable for level measurement in closed tanks.
Measuring arrangement level measurement in open tanks
• PMD70, PMD75: Mount device below the lower measuring connection. The negative side is open to
atmosphere pressure.
• FMD76, FMD77: Mount device direct on the tank. The negative side is open to atmosphere pressure.
Measuring arrangement level measurement in closed tanks and closed tanks with superimposed vapour
• PMD70, PMD75: Mount device below the lower measuring connection. Always connect the negative side
above the maximum level.
• FMD76, FMD77: Mount device direct on the tank. Always connect the negative side above the maximum
level.
• In the case of level measurement in closed tanks with superimposed vapour, a condensate trap ensures
pressure which remains constant on the minus side.
Pressure measurement
• The PMD70 and PMD75 are best suited to differential pressure measurement.
• Measuring arrangement for gases: Mount device above the measuring point.
• Measuring arrangement for liquids and steams: Mount device below tapping point.
• For differential pressure measurement in vapour, mount the condensate traps at the same level as the same
the tapping point and at the same distance from Deltabar S.
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