Deltabar S PMD70/75 FMD76/77/78

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Deltabar S
Thermal change of the zero
output and the output span –
PMD70, FMD76
Measuring cell –10 to +60 °C (14 to 140 °F) –20 to –10 °C (-4 to 14 °F),
+60 to +85 °C (140 to 185 °F)
% of the set span
25 mbar (0.375 psi) (0.35 x TD + 0.05) (0.3 x TD + 0.15)
100 mbar
(1.5 psi)
(0.05 x TD + 0.05) (0.08 x TD + 0.07)
Operating conditions (Installation)
General installation
instructions
Measuring arrangement
• The position-dependent zero point shift can be corrected directly at the device via operating keys, and also
in hazardous areas in the case of devices with external operation. Diaphragm seals also shift the zero point,
depending on the installation position ( ä 65 ff, "Installation instructions, diaphragm seal systems"
section).
• The housing of the Deltabar S can be rotated up to 380°. See ä 26, "Turning the housing" section.
• Endress+Hauser offers a mounting bracket for installing the device on pipes or walls.
See ä 24, "Wall and pipe-mounting" section.
• When measuring in media containing solids, 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 pressure 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 pressure piping with a continuous gradient of at least 10%.
• When routing the pressure piping outdoors, ensure sufficient anti-freeze protection, e.g. by using pipe heat
tracing.
• For FMD77 and FMD78: ä 65 ff, "Installation instructions, diaphragm seal system" section.
• Use flushing rings for flange and cell diaphragm seals if buildup or clogging can be expected at the diaphragm
seal connection. The flushing ring can be fitted between the process connection and diaphragm seal. Material
buildup in front of the process isolating diaphragm can be flushed away, and the pressure chamber vented,
via the two lateral flushing holes.
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 vapors: Mount device below the measuring point.
• For flow measurement in vapors, mount the condensate traps at the same level as 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 for level measurement in open tanks
• PMD70, PMD75: Mount device below the lower measuring connection. The negative side is open to
atmospheric pressure.
• FMD76, FMD77: Mount device directly on the tank. The negative side is open to atmospheric pressure.
Measuring arrangement for level measurement in closed tanks and closed tanks with superimposed vapor
• PMD70, PMD75: Mount device below the lower measuring connection. Always connect the negative side
above the maximum level via pressure piping.
• FMD76, FMD77: Mount device directly on the tank. Always connect the negative side above the maximum
level via pressure piping.
• In the case of level measurement in closed tanks with superimposed vapor, a condensate trap ensures the
pressure remains constant on the minus side.
Endress+Hauser 23
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