Differential pressure Endress+Hauser

Differential pressure Endress+Hauser

Whether pressure, level or flow, today pressure measurement technology is often used for measuring liquids, pastes, and gases. With a wide range of sensor technology Endress+Hauser offer instruments with the perfect fit for any kind of application.

Differential pressure transmitters with piezoresistive pressure sensors and welded metallic membrane or electronic dp or diaphragm seal are used mostly in the process industry. Deltabar offers continuous level measurement in liquids as well as volume or mass flow measurement using primary elements. It is also possible to do filter monitoring with the differential pressure transmitter.

Beside the devices with silicon or diaphragm seal for differential pressure, level, dp flow measurement, Deltabar electronic dp is a differential pressure system combining two sensor modules and one transmitter. In level applications, the high-pressure sensor (HP) measures the hydrostatic pressure. The low-pressure sensor (LP) measures the head pressure. The level or differential pressure is calculated in the transmitter using these two digital values.

Differential pressure measurement:

Measuring Principle

Silicon cell:

The operating pressure deflects the process isolating diaphragm and a fill fluid transfers the pressure to a resistance bridge (semiconductor technology). The pressure-dependent change in the bridge output voltage is measured and evaluated.

Diaphragm seal:

The operating pressure acts on the process isolating diaphragm of the diaphragm seal and is transferred to the process isolating diaphragm of the sensor by a fill fluid.

Primary elements:

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Benefits

• Easy menu-guided commissioning via local display, 4 to 20mA with HART, PROFIBUS PA, FOUNDATION Fieldbus
• Easy process adaptation to impulse line high-pressure/low-pressure change via an electric switch on the main electronics
• Compact design and modular concept for easy replacement of display or electronics
• Process pressure up to SIL2 certified to IEC 61508 and IEC 61511
• Global usage thanks to the widest range of approvals for industries and applications

Differential pressure Deltabar PMD55

The Deltabar PMD55 differential pressure transmitter with piezoresistive sensor and the welded metallic membrane is typically used in the process or environmental applications for continuous measurement of pressure differences in liquids, vapors, and gases. Quick Setup with adjustable measuring range allows simple commissioning, reduces costs and saves time. SIL2 according to IEC 61508 / IEC 61511.

Field of application

For level, volume or mass measurement in liquids, differential pressure monitoring, e.g. of filters and pumps as well as flow measurement (volume or mass flow) in conjunction with primary elements in gases, vapors, and liquids.

• Process connections: Threads
• Process temperature: -40 to 85°C (-40 to 185°F)
• Measuring ranges: 0.5mbar to 40bar (0.0072 to 600psi)
• Accuracy: ±0.1%, “Platinum” ±0.075% (optional)
• International explosion protection certificates, SIL