Critical Technical Advantages
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Flexible Application Range: The PMD55 is a “3-in-1” solution. It can be configured for level measurement (volume or mass), differential pressure monitoring (across filters or pumps), and flow measurement (when used with an orifice plate or Pitot tube).
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Electric HP/LP Switch: A standout feature is the internal electric switch on the electronics. This allows you to swap the high-pressure (HP) and low-pressure (LP) sides without physically re-plumbing the impulse lines, significantly simplifying onsite installation errors.
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SIL2 Safety by Design: Certified to IEC 61508 and IEC 61511, the PMD55 is ready for use in safety-instrumented systems (SIS), providing reliable monitoring for critical process pressures.
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Modular and User-Friendly: The device features a modular concept where the display or electronics can be replaced easily in the field. The menu-guided Quick Setup allows for fast commissioning, reducing the technical expertise required for initial configuration.
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High Precision Options: While the standard accuracy is ±0.1%, a “Platinum” version is available that provides an accuracy of ±0.075%, ensuring precise data for critical mass flow or inventory calculations.
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Broad Integration: It supports all major industrial communication protocols, including 4-20mA HART, PROFIBUS PA, and FOUNDATION Fieldbus, allowing it to fit into almost any existing control architecture.
Technical Performance Matrix
| Feature | Details |
| Measuring Principle | Differential Pressure (Piezoresistive) |
| Sensor Type | Welded Metallic Membrane |
| Accuracy | ±0.1% (Standard) / ±0.075% (Platinum) |
| Measuring Range | 0.5 mbar to 40 bar (0.0072 to 600 psi) |
| Process Temperature | -40 to 85°C (-40 to 185°F) |
| Safety Rating | SIL2 (IEC 61508 / IEC 61511) |
| Communication | HART, PROFIBUS PA, FOUNDATION Fieldbus |
Primary Applications
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Filter and Pump Monitoring: Detecting pressure drops across filters to schedule maintenance or monitoring pump performance to prevent cavitation and dry-running.
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Flow Measurement: Calculating the volume or mass flow of steam, gases, and liquids in conjunction with primary elements like orifice plates or Venturi tubes.
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Level in Pressurized Tanks: Measuring the hydrostatic head in closed vessels where the gas phase pressure must be subtracted to determine liquid height.
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Steam Applications: Reliable monitoring of steam lines in power generation or industrial heating processes.
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Environmental Monitoring: Tracking pressure differences in air filtration or scrubbing systems for emissions control.
