Product Introduction
The VEGA VEGADIF 85 is a differential pressure transmitter with a metallic measuring diaphragm. It measures the pressure difference between two process points and converts it into an electronic signal for monitoring pressure, level, flow, density, and interface levels.
Key Features
- High Measurement Accuracy: Deviation as low as ±0.065% according to published specifications.
- Integrated Overload Protection: Helps protect the measuring cell against excessive differential pressure.
- Multivariable Measurement: Integrated absolute pressure measurement supports additional process information.
- Flexible Process Connections: Threaded and flanged options accommodate different installation requirements.
- Multiple Communication Options: Available with 4–20 mA, HART®, PROFIBUS PA, or FOUNDATION Fieldbus, depending on configuration.
- Chemical Seal Compatibility: Suitable configurations support high-temperature applications and challenging process media.
Applications
- Pressurized Tanks: Hydrostatic level measurement in vessels operating under pressure.
- Flow Measurement: Differential pressure measurement when combined with a compatible primary flow element.
- Filter Monitoring: Detecting pressure differences across filters to assess blockage and maintenance needs.
- Density Measurement: Monitoring liquid density in suitable process configurations.
- Interface Measurement: Measuring the interface between two liquids when process conditions and installation are appropriate.
- Power and Chemical Industries: Monitoring differential pressure in demanding process systems.
Technical Highlights and Selection Considerations
The VEGADIF 85 combines a metallic measuring cell with integrated overload protection and absolute pressure measurement. Published specifications include a measuring range up to ±40 bar, process pressure up to 400 bar, and accuracy of 0.065%, depending on configuration.
When selecting a model, confirm the differential pressure range, static process pressure, process temperature, medium compatibility, connection type, chemical seal requirements, and output protocol. Chemical seals may be necessary for extreme temperatures or aggressive media.
Frequently Asked Questions
Q1: What is the VEGA VEGADIF 85 used for?
It is used for differential pressure measurement in applications including tank level, flow, filter monitoring, density, and liquid interface measurement.
Q2: Can the VEGADIF 85 measure level in pressurized tanks?
Yes. It can determine liquid level from differential pressure in pressurized vessels when correctly configured for vessel pressure and process conditions.
Q3: What is the measurement accuracy of the VEGADIF 85?
The published accuracy is 0.065%, depending on the selected configuration and applicable measurement conditions.
Q4: Can the VEGADIF 85 handle high process temperatures?
Yes. With suitable chemical seals, selected configurations support process temperatures up to 400°C. The allowable temperature depends on the seal and installation arrangement.
Q5: Which communication protocols are available?
Options include 4–20 mA, 4–20 mA/HART®, PROFIBUS PA, and FOUNDATION Fieldbus. Availability depends on the selected version.
