In the ever-evolving world of subsea exploration and marine engineering, data accuracy and communication reliability are paramount. At ESI Technology, we’ve built our reputation on delivering high-performance pressure measurement solutions designed to meet the extreme challenges of underwater environments. One of our standout products in this field is the subsea pressure transmitter with RS-485 interface or Modbus RTU – a robust, accurate, and intelligent device that supports demanding subsea operations, including ROVs and deep-sea testing systems.

Designed for extreme depths

The PR3930 subsea pressure transmitter with RS-485 interface or Modbus RTU is engineered to withstand submersion to depths of up to 6,000 meters. Its durable construction and pressure-resistant design allow it to function reliably in some of the harshest and most remote underwater environments on Earth. Whether it’s installed on a remotely operated vehicle (ROV) or integrated into deep-sea test equipment, this transmitter delivers precise and dependable pressure data under intense oceanic pressure.

Silicon-on-Sapphire sensor technology

At the heart of this transmitter is our advanced Silicon-on-Sapphire sensor technology. This sensor type is known for its exceptional performance in high-pressure environments, thanks to the unparalleled mechanical and thermal stability of sapphire. The sensor remains accurate and stable even under fluctuating temperatures and pressures, offering a level of resilience and longevity that traditional sensors struggle to match. This makes it ideal for long-term deployment in subsea applications where consistent performance is critical.

High pressure ranges and accuracy

Our subsea pressure transmitter is available in pressure ranges up to 1,500 bar, allowing it to handle a wide variety of underwater applications. We also offer a high accuracy option for projects that demand the most precise readings possible. This ensures operators receive dependable data that can be used with confidence for monitoring, control, and analysis in subsea environments.

Advanced communication with RS-485 and Modbus RTU

A key feature of the subsea pressure transmitter with RS-485 interface or Modbus RTU is its robust digital communication capability. RS-485 communication supports distances up to 1200 meters, making it ideal for large-scale subsea installations or operations involving extended cabling. The Modbus RTU protocol, widely used in industrial and marine systems, enables seamless integration with existing SCADA, PLC, and data acquisition systems.

One of the major benefits of RS-485 communication is its resistance to electrical noise interference. This is especially important in subsea applications where long cable runs, high-current equipment, and electromagnetic interference can disrupt signal transmission. Our transmitter ensures that data remains intact and accurate, even in electrically noisy environments.

In addition, users can benefit from a selectable baud rate, which adds flexibility to communication setup and allows fine-tuning of the data transmission speed to match system requirements.

Proven under pressure: Hyperbaric and ESS tested

To ensure the subsea pressure transmitter with RS-485 interface or Modbus RTU can operate reliably in deep-sea conditions, we conduct rigorous Hyperbaric and Environmental Stress Screening (ESS) testing at ESI Technology. Hyperbaric testing simulates the high-pressure conditions found at extreme ocean depths, verifying that the transmitter can maintain integrity and function under real-world stress. ESS testing further ensures long-term reliability by exposing the device to rapid thermal cycling, vibration, and other environmental conditions that mimic the operational life cycle.

These rigorous test procedures are part of our commitment to quality and reliability, giving our customers confidence that their equipment will perform when it matters most.

Built for marine engineering and offshore operations

The subsea pressure transmitter with RS-485 interface or Modbus RTU is perfectly suited for a wide range of underwater and offshore applications. Its robust construction, precision performance, and advanced communication capabilities make it ideal for use in subsea robotics, underwater pipeline monitoring, marine research instruments, and oil and gas exploration tools.

Because we design and manufacture our pressure transmitters in-house at ESI Technology, we have full control over the quality, materials, and customisation options. This enables us to tailor solutions to meet the unique needs of our clients, whether they’re working in defence, energy, marine science, or industrial automation.

Conclusion

At ESI Technology, we combine cutting-edge sensor innovation with practical engineering expertise to deliver solutions that thrive in the toughest subsea environments. The subsea pressure transmitter with RS-485 interface or Modbus RTU embodies this commitment, offering unmatched durability, accuracy, and communication performance. If your project demands reliable data from the ocean depths, our pressure transmitters are the proven solution.