Subsea pressure and level transmitters for marine and offshore oil and gas applications

Paul Boughton

Instrumentation specialist Impress Sensors & Systems Ltd has launched a new range of subsea pressure and level transmitters. The sensors are suitable for a variety of subsea pressure and level measurement applications, in depths up to 3,000 metres and external pressures up to 300bar.

Manufactured in the UK by Impress Sensors, the SS series of subsea pressure and level transmitters are suitable for continuous submersion in seawater. The transmitters use a ceramic pressure sensor, which provides excellent corrosion resistance for harsh seawater applications. The transmitters are fitted with a choice of subsea-certified connectors and locking sleeves to suit specific customer requirements. The SS transmitters are suitable for a wide range of subsea oil and gas, marine and offshore applications, including pressure, level and depth measurement on unmanned surface vehicles (USVs), remotely operated vehicles (ROVs) and other subsea hydraulics systems.

The sensor can be customised to suit the application. The housing is available in a choice of seawater-compatible materials, including 316L stainless steel, high grade Duplex stainless steel or Marine bronze. Nominal pressures are from 1 bar to 400bar. All sensors in the series provide dual independent, 2-wire, 4-20mA outputs, with no signal loss over long cable lengths. The sensors are calibrated and supplied with a traceable serial number and calibration certificate. Operating (media) temperatures are from -20°C to +60°C in non-freezing media.

The electronics incorporate a microprocessor-based amplifier, with level measurements made possible by RS485 Modbus RTU serial communication. Impress provides a standard software package, which enables the user to re-range, calibrate and adjust some parameters of the device. There is also a facility to data log via the software, which is useful for checking installation and behaviours of the application.

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