Description

The PR3930 subsea pressure transducer is engineered for high-accuracy pressure measurement in deep-sea and harsh subsea environments, including offshore oil & gas, ROV systems, and oceanographic research.

Designed for long-term subsea deployment, this digital and analog subsea pressure sensor delivers exceptional stability, corrosion resistance, and reliable communication via RS-485 over long distances.

Features & Performance

• Depth rating: Up to 6,000 meters (deep ocean applications)
• Pressure ranges: Up to 1,500 bar (21,755 psi)
• Output signals:
  RS-485 (half-duplex digital communication)
  0–5 V analog output
• Communication distance: Up to 1,200 meters (RS-485)
• Selectable baud rate for flexible system integration
• High accuracy
• Excellent EMI/noise resistance for subsea electronics
• Hyperbaric tested (certification available up to 3,000 m)
• Environmental Stress Screening (ESS tested)
• Connector: Subconn MCBH8M (8-pin), optional 6-pin version

Advanced Sensor Technology

The PR3930 utilizes Silicon-on-Sapphire (SoS) sensor technology, a preferred solution for high-pressure subsea instrumentation:

• Piezoresistive silicon strain gauge grown on sapphire diaphragm
• Molecularly bonded to a titanium alloy sub-diaphragm
• Virtually zero hysteresis
• Superior long-term drift performance
• Excellent corrosion resistance in seawater environments
• Wide operating temperature range without signal degradation

This makes it ideal for deep sea pressure sensing where conventional sensors fail.

RS-485 Subsea Communication Advantages

The integrated RS-485 interface enables:

• Multi-drop networking (multiple sensors on one line)
• Unique device addressing for each transducer
• Reduced cabling complexity in subsea systems
• Reliable long-distance data transmission (up to 1200 m)
• Improved signal integrity in electrically noisy environments

Applications

Offshore oil & gas production systems
Location: On subsea manifolds and flowlines
Prevents: Overpressure, equipment damage, and unplanned shutdowns

Subsea wellhead and pipeline pressure monitoring
Location: At wellheads and along pipelines
Prevents: Leaks, blockages, and pressure loss events

ROV (Remotely Operated Vehicle) systems
Location: External frame (depth) or hydraulic circuits
Prevents: Navigation errors, hydraulic failure, and overload conditions

Deep ocean research and oceanography
Location: Sensor packages and instrument frames
Prevents: Data inaccuracies and sensor drift over long deployments

Subsea control modules (SCM)
Location: Hydraulic and control system lines
Prevents: Control failure, valve malfunction, and system instability

Leak detection and pressure monitoring systems
Location: Critical junctions and sealed enclosures
Prevents: Undetected leaks and catastrophic system failure

Naval and defense subsea systems
Location: Hulls, sonar systems, and subsea equipment
Prevents: Structural failure and mission-critical system faults

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Frequently Asked Questions (FAQ)

1. What is a subsea pressure transducer?

A subsea pressure transducer is a sensor designed to measure pressure underwater, often at extreme depths, converting pressure into an electrical signal (analog or digital) for monitoring and control systems.

2. What makes Silicon-on-Sapphire sensors better for subsea use?

Silicon-on-Sapphire technology offers:

• Higher stability over time
• Better temperature performance
• Minimal hysteresis

3. Can the PR3930 be used in long-distance subsea networks?

Yes. The RS-485 interface supports communication distances up to 1200 meters and allows multiple sensors on a single network using unique addresses.

4. Is this sensor suitable for permanent underwater installation?

Yes. The PR3930 is fully welded and hermetically sealed, making it suitable for continuous long-term subsea deployment.

5. Are calibration and test certificates available?

Yes. Units can be supplied with hyperbaric test certificates and calibration data upon request.