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About Differential Pressure (DP) Level Measurement

Industry-leading DP Level solutions deliver increased accuracy and reliability through continuous technology innovation.

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DP Level Measurement Technology

Differential Pressure (DP) Level Measurement uses pressure readings and specific gravity to output level. DP Level is a common measurement technique that is used in a wide variety of applications. Solutions include standard transmitter connections and integrated transmitters with direct or remote mount seals that can be configured in tuned, balanced, and electronic systems.

About DP Level Technology

Direct mount and remote mount connections are engineered to meet a wide variety of measurement needs. Direct mount connections offer simple installation for mounting transmitters directly to the vessel eliminating the need for additional transmitter mounting provisions. Remote mount connections consist of a seal attached to a transmitter via capillary tube and are used in tuned or balanced systems, high temperature installations and remote transmitter mounting applications.

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Electronic Remote Sensor (ERS™) System provides DP Level measurements by calculating differential pressure from individual pressure readings. This solution eliminates the need for long capillaries and heat tracing, reducing response time by up to 90%. The sensor system is synchronized for DP calculation, easily connects with cable, and can be independently installed and serviced for simple installation and maintenance.

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A Tuned-System™ Assembly measures level using capillaries with two different lengths connected to a transmitter which allows the system to compensate for temperature drift. Typically, one side of the system is directly mounted to the vessel and the other is mounted remotely via a capillary tube. This system saves time and cost during installation by eliminating additional transmitter mounting components and is a great solution for applications with short spans and high pressures.

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Balanced Systems are a reliable solution which consists of two, equal-length capillaries connected between the transmitter and seals. The system eliminates the maintenance concerns of wet or dry legs and are good for horizontal flow and indoor applications with little to no temperature variations.

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Fill Fluid selection significantly impacts the performance of DP Level systems as they can solidify or vaporize due to harsh process environments leading to inaccurate readings.  Many fill fluids are available for different application needs, such as temperatures down to -105 °C (-157 °F) and up to 410 °C (770 °F) and fluids qualified for hygienic applications.

The Diaphragm Seal System protects transmitters from hot, cold, corrosive, erosive or viscous processes. Seals are available with differential, gage and absolute pressure transmitters. Advanced welding and assembly techniques prevent weld corrosion and improve seal strength to deliver reliability and performance in the toughest applications. 

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Thermal Range Expander enables pressure and level measurements in high temperature processes. This seal system uses two different fill fluids, extending the operating range of the transmitter from temperatures ranging from -75 °C (-103 °F) to 410 °C (770 °F). With an improved response time of up to 46%, thermal range expanders simplify installation and reduce cost by eliminating impulse piping and heat tracing.

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Video & Case Studies

Eliminate heat tracing and extend process temperature measurement up to 410°C (770°F). This differential pressure (DP) level technology provides more reliable, accurate and faster process measurements in extreme conditions.

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