Deltabar S
Endress+Hauser 21
Operating conditions (installation)
General installation instructions • For FMD 77 and FMD 78: See page 50 ff, "Installation instructions, Diaphragm seal systems" section.
• The position-dependent zero shift can be corrected directly at the device via operating keys, even in
hazardous areas. Diaphragm seals also shift the zero point, depending on the installation position (→ See also
page 50 ff, "Installation instructions, Diaphragm seal systems").
• The housing of the Deltabar S can be rotated up to 380°. → See also page 22, section "Rotating the
housing".
• Endress+Hauser offers a mounting bracket for installing on pipes or walls. → See also page 22, 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.
Measuring arrangement Flow measurement
• The PMD 70 and PMD 75 are best suited to flow measurement.
• Measuring arrangement for gases: Mount device above the measuring point.
• Measuring arrangement for liquids and steam: Mount device below tapping point.
• For flow measurement in steam, mount the condensate traps at the same level as the tapping point and at
the same distance from Deltabar S.
Level measurement
• PMD 70, PMD 75, FMD 76 and FMD 77 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
• PMD 70, PMD 75: Mount device below the lower measuring connection. The negative side is open to
atmosphere pressure.
• FMD 76, FMD 77: Mount device directly on the tank or with shut-off valve. The negative side is open to
atmospheric pressure.
Measuring arrangement level measurement in closed tanks and closed tanks with static pressure
• PMD 70, PMD 75: Mount device below the lower measuring connection. Always connect the negative side
above the maximum level.
• FMD 76, FMD 77: Mount device directy on the tank. Always connect the negative side above the maximum
level.
• In the case of level measurement in closed tanks with static pressure, a condensate trap ensures pressure
which remains constant on the minus side.
Pressure measurement
• The PMD 70 and PMD 75 are best suited to differential pressure measurement.
• Measuring arrangement for gases: Mount device above the measuring point.
• Measuring arrangement for liquids and steam: Mount device below tapping point.
• For differential pressure measurement in steam, mount the condensate traps at the same level as the tapping
point and at the same distance from Deltabar S.
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