Differential pressure transmitters

Differential pressure measurement technology is used to measure gauge pressure, level or flow in applications with liquids, pastes and gases. With a wide range of sensor technologies, Endress + Hauser offers instruments that are perfectly suited to any kind of application.




Differential pressure transmitter with polysilicon measuring cell (metallic)


Metal cell differential pressure measurement principle

The working pressure flexes the process isolation diaphragm and a filling fluid transfers the pressure to a bridge of resistors of the (semiconductor technology) type. The change in bridge output voltage due to pressure is measured and processed.

ADVANTAGE

Metallic measuring cell in different materials and process connections available

Suitable for use at high pressures 700 bar (over load up to 1050 bar)

Temperature up to +125 °C / + 257 °F

Measurement accuracy ± 0.5 / 0.3% in basic models, ± 0.1% as standard and ± 0.05 / ± 0.025% in high-performance versions

Designed according to IEC 61508 for use in SIL2 / 3 safety systems



PRODUCTS


Deltabar M PMD55

Process applications
Differential pressure transmitter with piezoresistive sensor and welded metallic membrane is typically used in general process applications.

Deltabar S PMD75

Demanding high accuracy applications
Differential pressure transmitter with piezoresistive sensor and welded metallic membrane is typically used in general process applications.

Accessories

Block valves, manifold.







Remote seal differential pressure transmitter


Measurement principle

Differential pressure transmitters with one or two separator seals are used for level measurement in pressurized vessels with high static pressure and / or in applications where flush mount process connections are required. They can be used for a product temperature between -70 and 400 °C (-94 and 752 °F).

ADVANTAGE

For use at pressure or level: Insensitive to aggressive, highly viscous, crystallizing or polymerizing products

Reliable use in demanding application conditions using coated capillaries

Process connections: Hygienic flanges and connections

Process temperature: -70 to + 400 °C (-94 to + 752 °F) measuring range: 100mbar to + 16bar (1.5 to 240psi)

Reference accuracy ± 0.075%



PRODUCTS


Deltabar S FMD77

Differential pressure and level transmitter with one or two asymmetric separator seals.

Deltabar S FMD78

Differential pressure transmitter with two symmetric separator seals.







Electronic differential pressure transmitter


Measurement principle

The electronic differential pressure system eliminates the typical inconveniences that occur in mechanical capillary systems, as well as temperature effects in capillary systems. Operation and maintenance costs are optimized as no recalibration or reconfiguration of the system is required in the event of a component replacement.

ADVANTAGE

Electronic differential pressure system eliminates the traditional drawbacks of mechanical systems, resulting in higher process availability and reliability

The architecture and design of electronic differential pressure systems minimize safety risks

Costs are reduced due to shorter installation times, maintenance, downtime, and spare parts

Process connections: Thread, flanges and hygienic connections

Process temperature: -40 to + 125 °C (-40 to + 257 °F), optional 250 °C (482 °F)

Measuring range: 100mbar to + 40bar (1.5 to 600psi)

Accuracy: per sensor up to ± 0.05%, per system up to ± 0.07%



PRODUCTS


Deltabar FMD71

Ceramic cell
Electronic differential pressure system comprising two ceramic sensors and a transmitter.

Deltabar FMD72

Polysilicon cell
Electronic differential pressure system comprising two fully welded metal sensors and a transmitter.

ECN Automation
offers comprehensive solutions.

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