ESI, Inc.

6560 W. Rogers Cir. #22
Boca Raton,  FL  33487

United States
  • Booth: 6526

ESI, Inc. designs and manufactures Pressure Transducers and Transmitters for the Oil & Gas, Subsea, AerospaceDefense, Automotive, Marineprocess and general industrial markets. All our products are rigorously tested to ISO9001 and Mil-I-45208 procedures and conform to CE requirements. EX, & DNV GL certification is also available.

Phone: 561-989-8540 / Email

 Press Releases

  • Many of the customised designs are based on standard products with modifications to allow operation in underwater environments; seals, welded housings conforming to NACE corrosion resistance requirements and subsea connector assemblies ensure high integrity even at extreme depths. ESI’s team of qualified engineers have extensive experience in electronic, software and mechanical instrumentation, and by working closely with customers, are able to create unique solutions meeting all of the specifications required.

    At the heart of each design is the unique Silicon-on-Sapphire sensor technology; a sensor not only with high sensitivity and stability but also rugged and resilient to high overload pressures and transients. The silicon is grown into the surface of the sapphire, resulting in incredible durability and stability with virtually no hysteresis and outstanding insulation properties, allowing the sensor to operate over a very wide temperature range. The excellent elasticity of the sapphire ensures high repeatability over a long service life.

    ESS & Hyperbaric Testing

    Pre-conditioning and testing is fundamental to the success of any subsea transmitter. ESI has made significant investment in test facilities, meaning that each unit will be environmentally screened and subjected to 3300 metres of submersion before leaving the factory, confirming at least 20 years of reliable service on the seabed with no concern about leakage or integrity.


    Documentation & Certification

    Document packages are required more frequently and are quickly becoming standard requirement within the oil, gas and subsea market. Therefore each ESI product is supplied with a complete package of documentation confirming calibration, accuracy, material conformity, hyperbaric test and ESS test certificates.

    Meet the products…

    PR3913 and PR3915 Series

    Housed in fully welded body with Inconel 625 wetted parts, this series is intended for permanent immersion in pressurised dielectic oil and protected from ingress with a high pressure glass-to-metal lead-through. The product can withstand external pressure up to 3,000 metres water depth and provides secondary pressure containment up to 1,650 bar. The PR3915 has two silicon-on-sapphire pressure sensors and electronics for reliable dual redundancy.

    PR3914 Series

    This design is intended for permanent immersion with external pressures of up to 6,000 metres water depth, with secondary pressure containment up to 1,650 bar. Units can be supplied with hyperbaric test certificates to 3,000 metres water submersion. A range of specialist subsea connections are available.

    PR3920 Series

    The PR3920 subsea differential pressure was developed to offer high accuracy differential pressure measurement on chemical injection valves. Typically, differential pressures of 50 bar can be monitored with a high accuracy. The Silicon-on-Sapphire sensor permits high line pressures of up to 1000 bar to be applied independently to either of the two pressure ports without affecting the performance of the transmitter.

  • Hazardous Zones

    First you need to understand hazardous locations. Explosive atmospheres can be caused by flammable gases, mists, vapours or combustible dusts. If there is enough of the substance mixed with the air, even the smallest of sparks could cause an explosion. The ATEX directive categorises hazardous areas like this:

    Hazard - Gas / vapour / mist

    Zone 0 - A place in which an explosive atmosphere consisting of a mixture with air of dangerous substances in the form of gas, vapour or mist is present continuously or for long periods or frequently

    Zone 1 - A place in which an explosive atmosphere consisting of a mixture with air of dangerous substances in the form of gas, vapour or mist is likely to occur in normal operation occasionally.

    Zone 2 - A place in which an explosive atmosphere consisting of a mixture with air of dangerous substances in the form of gas, vapour or mist is not likely to occur in normal operation but, if it does occur, will persist for a short period only.

    Hazard - Powder / dust

    Zone 20 - A place in which an explosive atmosphere in the form of a cloud of combustible dust in air is present continuously, or for long periods or frequently.

    Zone 21 - A place in which an explosive atmosphere in the form of a cloud of combustible dust in air is likely to occur in normal operation occasionally.

    Zone 22 - A place in which an explosive atmosphere in the form of a cloud of combustible dust in air is not likely to occur in normal operation but, if it does occur, will persist for a short period only.

    Many environments require intrinsic safety, but many transmitters may only be classed as explosion or flame proof or similar. The ATEX categories are;

    • i intrinsic safety (Limitation of electrical ignition energy by limiting current and voltage)               
    • ia or iaD  for Zone 0 or Zone 20
    • ib or ibD for Zone 1 or Zone 21
    • ic for Zone 2      
    • d flameproof / explosion proof enclosure, suitable for zone 1/21 and 2/22         
    • n non-incendive, suitable for zone 2/22
    • m encapsulation suitable for zone 1/21 and 2/22

    There are many methods of protection that can be used to make a pressure transmitter safe in a hazardous area. Most will allow the sensor to be installed in areas classified as Zone 1 or 2. However, only intrinsically safe (ia) and encapsulated devices (m) can be used in Zone 0 locations.

    At ESI we manufacture intrinsically safe pressure transmitters that are ATEX and IECEx certified. We are often asked for Explosion proof transmitters, but what are the differences?

    The first and most notable difference is how the transmitters are built. An Ex-d pressure transmitter must have a flameproof or explosion-proof enclosure. This means that the transmitter’s electronic components should be mounted inside a housing which is designed to contain the flame, should it explode or catch fire. This method is used where it is impossible to reduce the electrical circuit energy by means of an isolated barrier for example.

    Intrinsically Safe (IS) describes a sensor that is designed and wired to work on such a low current and voltage that it cannot possibly ignite flammable material. Used together with an intrinsically safe isolated barrier, the transmitter can operate safely even in the most hazardous areas.

    Wiring for hazardous areas

    Explosion proof wiring is much more expensive than intrinsically safe wiring because it requires explosion proof conduit and seals to isolate the circuit from hazardous gases. The seals prevent the hazardous media from flowing into the conduit. If the circuit were to ignite any hazardous dusts or gases that made their way into the explosion proof wiring, the housing and conduit are capable of containing the explosion. Any escaping hot gases would be cooled enough so that they would not be able to ignite any of the hazardous media outside of the explosion proof conduit or fixtures.

    Intrinsically safe wiring does not require the conduit and seals, but you will need an intrinsically safe barrier. This device is wired between the sensor and the power source. It controls the amount of energy that the power source sends to the sensor transmitter.

    Still unsure? We’re happy to help you select the best pressure transmitter for your hazardous application. Contact sales at 561-989-8540 / email us at


  • DYNAMIC GD4200-USB Pressure Transducer
    - Sample rate up to 1,000Hz (1,000 readings per second)
    - Silicon-on-Sapphire pressure sensor technology
    - Choice of pressure ranges from vac to 72,500 psi /5,000 bar
    - Accuracy (NLHR) ±0.15% of span BFSL
    - USB 2.0 compatible...

  • The GD4200-USB© Digital Pressure Transducer has been designed to measure, analyse and record pressure directly on your computer without the need for costly I/O interface boards. It allows the user to measure up to 16 pressure inputs simultaneously and easily create customised test certificates.

    The transducer is powered by the computer’s USB port, data is then presented on the PC via the ESI-USB© configurable Windows Interface software. It has instant connection with auto-detection, and will configure automatically with your desktop, laptop or Windows tablet via USB protocol. The sample rate enables dynamic pressures to be measured with up to 21 bit resolution at user selectable speeds up to 1,000 Hz.

  • Submersible Level Transmitters
    - Diameter Ø16mm (0.63″) / Ø22mm (0.9″) / Ø25mm (1.0″) / Ø40mm (1.6″)
    - Anti-clog attachment available
    - Intrinsically safe option...

  • PROTRAN PR3440, PR3441, PR34442

    • High stability and repeatability
    • All stainless steel housing
    • 4-20mA two-wire output
    • Zero + span adjustment on-site
    • Available: Ø 40mm (1.6″), Ø 22mm (0.9″), Ø 25mm (1.0")

    PROTRAN PR9500

    • Silicon-on-sapphire sensor technology
    • License free radio transmission up to 200 meters (650ft)
    • All stainless steel housing
    • High stability and repeatability
    • Pressure ranges 0-500mbar to 0-1,500bar (0-7.5psi to 0-20,000psi)
    • Zero + span adjustable
    • Type and CE approved
  • PROTRAN PR3914 Subsea Pressure Transducer
    - Suitable for ROV and deep sea test equipment
    - Silicon-on-Sapphire sensor technology for outstanding performance
    - Submersion to 6,000 meters (20,000 ft) depth
    - Pressure ranges available to 2,000 bar (30,000 psi)...

  • The PR3914 subsea pressure transmitter has been designed to meet the demanding requirements of pressure measurement at deep levels of immersion especially in oil industry applications. It can be configured to suit a multitude of applications

    The unique Silicon-on-Sapphire sensor technology provides outstanding performance and gives excellent stability over a wide temperature range. The advanced sensor design consists of a piezoresistive silicon strain gauge circuit, which is epitaxially grown onto the surface of a sapphire diaphragm to form a single crystalline structure.

Please contact for questions.
For technical assistance please contact: support.