Introduction
The Endress+Hauser Deltabar FMD71 is an advanced electronic differential pressure (dp) system engineered for precise level, volume, and mass measurement of liquids in pressurized tanks, distillation columns, and evaporators. It replaces traditional mechanical differential pressure setups with a digital system using two high-performance sensor modules paired with one transmitter, eliminating common mechanical failures. Designed for demanding industrial and hygienic applications, it delivers exceptional reliability, process availability, and long-term stability while minimizing operational risks and total cost of ownership.
Specification
| Parameter | Specification |
|---|---|
| Measuring Principle | Differential pressure (electronic system) |
| Measuring Range | 100 mbar to 40 bar (1.5 psi to 600 psi) |
| Accuracy | Single sensor: up to ±0.05% (Platinum), System: up to ±0.07% |
| Process Temperature | -40 to +150°C (-40 to +302°F) |
| Ambient Temperature | -40 to +80°C (-40 to +176°F) |
| Communication Protocol | 4…20 mA HART |
| Long-Term Stability | 0.05% of URL/year (per sensor) |
| Max. Overpressure Limit | 60 bar (900 psi) |
| Process Connections | Threads, Flanges (DIN/ASME/JIS), Hygienic (DIN 11851, Tri-Clamp, etc.) |
| Certifications & Approvals | ATEX, FM, CSA, IECEx, NEPSI, INMETRO, UK Ex, NACE MR0175, EHEDG, 3A |
Key Advantages
High Precision Ceramic Sensor Performance: Features a 99.9% Al₂O₃ sensor with up to ±0.05% accuracy (Platinum grade) and 0.05% URL/year long-term stability, outperforming conventional sensors in overload resistance and repeatability.
All-Digital DP Architecture: Removes capillary-related issues (like freezing, leaks, and drift) found in traditional mechanical systems, boosting process uptime and reducing unplanned maintenance.
HART Multivariable Diagnostics: Delivers real-time differential pressure, head pressure, and sensor temperature data from one unit, enabling proactive monitoring and predictive maintenance.
Certified for Hygienic & Hazardous Environments: Backed by global approvals including ATEX, IECEx, EHEDG, and 3A, making it suitable for food & beverage, pharmaceutical, and explosion-risk applications.
Lowest Total Cost of Ownership: Cuts installation time, maintenance, and spare part costs significantly compared to mechanical alternatives, with minimal downtime and long calibration intervals.