Precision Pressure Measurement for a Complex World

Re-introducing a leader for 2026

Nestled in North Wales, ESI Technology Ltd has spent more than forty years at the forefront of pressure measurement innovation — an enduring rhythm of precision engineering and purpose-built sensing solutions that serve industries where accuracy isn’t just desired, it’s demanded. Founded in the mid-1980s, ESI’s journey from specialist aerospace projects to global deployment in oil & gas, marine, hydrogen and beyond is a testament to adaptability, ingenuity, and technological resilience.

Silicon-on-Sapphire Sensor Technology — The Heart of our Performance

At the core of ESI’s capability lies our signature Silicon-on-Sapphire (SOS) sensor technology, a remarkable leap in pressure sensing. Instead of relying on conventional strain gauges, ESI’s SOS sensors combine a thin silicon sensing layer grown directly onto a sapphire substrate. This fusion delivers near-zero hysteresis, superb repeatability, wide temperature stability, excellent overpressure resilience and chemical compatibility that few alternatives can match.

Technically elegant and notoriously robust, SOS technology unlocks measurement ranges from low pressures to as high as 5000 bar and thrives in environments where traditional sensors simply won’t survive. Titanium alloy diaphragms and durable housings — often machined from single pieces for high-integrity operation — further elevate “rugged” into a new category of dependability.

Multifaceted Market Reach

ESI’s sensor and transmitter portfolio stretches across diverse industries, each with its own challenges:

Oil & Gas and Subsea
From topside platforms to deep hydrocarbon wells, ESI pressure solutions monitor critical conditions under high pressures and corrosive environments. Dual redundant subsea units and hyperbaric rated devices demonstrate our readiness for extreme underwater applications.

Aerospace & Defence
Aerospace demands meticulous accuracy and durability, and ESI has over three decades of supplying sensors into aerospace and defence programmes. From aircraft systems to military hydraulics and test rigs, precision under vibration, temperature swings and long service life is indispensable.

Marine & Offshore
With DNV qualifications embedded across key product ranges, ESI sensors meet the rigours of marine classification standards — essential for ship systems, ballast and fuel monitoring, and offshore energy platforms.

General Industrial & Process
Whether it’s industrial automation, process control loops, or safety monitoring, ESI delivers pressure transducers and transmitters built for uptime and accuracy across harsh factories and chemical plants.

Hydrogen & Emerging Energies
In the rapidly evolving hydrogen economy, ESI’s pressure measurement units — including ATEX and IECEx certified intrinsically safe options — are engineered to function in hydrogen refuelling, storage and production systems with robust media compatibility and safety-centred design.

Safety, Certification & Quality Framework

Our commitment to quality and compliance is reflected in its accreditations:

• ATEX & IECEx — ensuring safe operation in explosive atmospheres and hazardous zones.
• DNV Marine Type Approvals — critical for maritime and offshore use cases.
• AS9100D — meeting stringent aerospace quality management expectations.

These certifications, together with ISO quality practices, give engineers the confidence that ESI sensors aren’t just precise — they’re compliant at a global scale.

Product Diversity & Custom Solutions

ESI’s product suite spans general-purpose and high-pressure transducers, differential pressure units, subsea transmitters, and digitally enabled sensors with software support like ESI-USB©, enabling real-time monitoring and data logging directly via laptop.

What sets ESI apart is not just what’s on the shelf — it’s our ability to customise solutions for unique applications, whether that’s a bespoke aerospace calibration unit or a subsea connector for deep-water asset monitoring.

Looking Forward in 2026

As industries pivot toward energy transition, automation and extreme environment exploration, ESI Technology Ltd stands primed to measure what matters most: pressure with steadfast precision. Our blend of innovative SOS technology, global certifications, and engineering fluency keeps us ready for tomorrow’s challenges — from offshore rigs and marine fleets to hydrogen infrastructure and aerospace platforms.

With decades of expertise behind us and a broad portfolio ahead, ESI continues to be a name synonymous with trustworthy and resilient pressure measurement solutions.