Smart HART Differential Pressure Transmitter | PMD3051
Process-Grade Smart Differential Pressure Transmitter for Heavy Industrial Applications
The PMD3051 Series is an industry-standard, high-precision smart differential pressure transmitter engineered for demanding industrial processes. Featuring advanced metal capacitance sensing technology, 0.075% full-scale accuracy, and 4–20 mA current output with superimposed HART digital protocol, the PMD3051 delivers robust measurement for liquids, gases, and steam.
Designed to operate under harsh conditions, it supports extreme static pressure resistance (up to 41 MPa / 410 bar) and features certified explosion-proof enclosures (Exd flameproof and Exi intrinsic safety).
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Key Applications: Flow measurement across primary elements (orifice plates/Venturi), liquid tank level monitoring, boiler drum pressure, and high-pressure gas pipeline monitoring.
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Pressure Ranges: Flexible span coverage from 0–7000 kPa (70 bar) up to 0–41 MPa (410 bar).
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Communication: 4–20 mA DC loop-powered with HART and optional RS485 communication.
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Safety Certifications: Flameproof Exd IIB T5 Gb and Intrinsically Safe Exia IIC T4/T5/T6 Ga.
Description
High-Precision Measurement with Metal Capacitance Technology
The PMD3051 Smart Differential Pressure Transmitter is built for critical process automation where accuracy, stability, and safety are non-negotiable. At its core, the transmitter utilizes an ultra-sensitive metal capacitance sensing cell. When process pressure acts through isolation diaphragms and conductive media onto the measuring diaphragm, the internal circuit converts minute deformations into a highly linear signal. Combined with integrated temperature compensation circuits, the PMD3051 delivers exceptional 0.075% accuracy with minimal thermal drift.
High Static Pressure Capability & Overpressure Protection
Unlike standard industrial pressure sensors that can lose calibration or suffer diaphragm damage under unbalanced system loads, the PMD3051 High Static (HP) configuration is rated to handle static pressures up to 41 MPa (410 kgf/cm²). This makes it the ideal choice for high-pressure hydraulic lines, oil and gas distribution, chemical reactors, and high-pressure steam loops.
Seamless DCS/PLC Integration via HART Protocol
Equipped with 4–20 mA DC two-wire output and superimposed HART protocol, the PMD3051 permits remote configuration, zero/span adjustments, and diagnostics without interrupting the analog loop signal. Its backlit LCD digital display provides real-time local pressure readouts in the field. For modern digital fieldbus networks, an optional RS485 communication interface is also available.
Certified for Hazardous Environments
Constructed with heavy-duty cast metal electronics housing and standard coplanar process flanges (1/4-NPT / 1/2-NPT), the PMD3051 is fully certified for dangerous environments. With dual certifications for explosion-proof (Exd IIB T5 Gb) and intrinsically safe (Exia IIC T4/T5/T6 Ga) operation, it meets global safety standards for refineries, chemical processing plants, and offshore platforms.
Features
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0.075% High Accuracy: Delivers process-grade measurement accuracy (0.075% standard, 0.1% optional) across wide span ratios.
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Metal Capacitance Sensor: Highly stable elastic diaphragm architecture providing superior zero stability and overpressure immunity.
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Extreme High Static Pressure Limit: Capable of withstanding static working pressures up to 41 MPa (410 bar).
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Universal HART Protocol & RS485: Standard 4–20 mA current loop with HART digital communication for remote diagnostics, configuration, and calibration.
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ATEX / IECEx Explosion-Proof Ratings: Certified flameproof (Exd IIB T5 Gb) and intrinsically safe (Exia IIC T4/T5/T6 Ga) for hazardous area installations.
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Broad Temperature Range: Operates in ambient and electronic temperatures from -40°C to +85°C.
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Versatile Medium Handling: Fully compatible with process liquids, dry or wet gases, and high-temperature steam systems.
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Standard Industrial Flanging: Features 1/4-18 NPT and 1/2-14 NPT process connections for mounting to manifolds and impulse lines.
Specification
| Parameter | Technical Specification PDF |
| Measurement Media |
Liquid, Gas, or Steam |
| Measurement Ranges |
0–7000 kPa (0–70 kgf/cm²) to 0–41 MPa (0–4100 kgf/cm²) |
| Accuracy Class |
±0.075% FS (Standard), ±0.1% FS (Optional) |
| Sensing Technology |
Metal Capacitance Cell |
| Output Signals |
4–20 mA DC with superimposed HART, optional RS485 |
| Power Supply |
24 VDC nominal (Operating range: 12 VDC to 45 VDC) |
| Long-Term Stability |
≤ ±0.2% FS over 12 months at maximum range |
| Temperature Effect |
≤ ±0.2% per 20°C (combined zero and span error) |
| Power Supply Effect |
Less than 0.005% / V of output range |
| Vibration Effect |
±0.05% / g of max range (at 200 Hz on any axis) |
| Operating Temperature | Electronics: -40°C to +85°C |
| Hazardous Area Proof | Flameproof: Exd IIB T5 Gb |
| Process Connections |
1/4-18 NPT female or 1/2-14 NPT female flange ports |
FAQ
1. What is the benefit of the 3051 architecture and metal capacitance cell?
The 3051 structure is the global industrial standard for process differential pressure transmitters. Its metal capacitance cell uses an internal elastic measuring element that deforms only minutely under pressure (less than 0.1 mm), giving it exceptional resistance to overpressure spikes, thermal shock, and high static line pressures.
2. Can the PMD3051 be configured remotely using a HART Communicator?
Yes. The PMD3051 outputs a standard two-wire 4–20 mA signal with superimposed digital HART communication. You can connect any standard HART field communicator or software interface across the loop wires to re-range the device, perform zero calibration, or read diagnostic data.
3. What is the difference between standard Differential Pressure (DP) and High Static (HP) models?
Standard DP transmitters are optimized for general differential pressure measurement across filters, pumps, and low-to-medium pressure lines. High Static (HP) models are reinforced to handle extremely high line/background working pressures (up to 41 MPa / 410 bar) while accurately measuring small pressure differences between the high and low ports.
4. Is the PMD3051 suitable for hazardous explosive environments?
Yes. The PMD3051 is designed for hazardous processing areas, carrying certified Flameproof (Exd IIB T5 Gb) and Intrinsically Safe (Exia IIC T4/T5/T6 Ga) ratings.
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