DRUCK-Subsea Pressure Transmitters (Model: PTX 300 Series)

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 The PTX 300 series of pressure transmitters has been developed for the offshore oil and gas industries as a compact, high performance device for reliable and long term subsea use. Maintenance free, it is available with operating ranges up to 22,500 psi and is fully submersible with an ambient pressure rating up to 5000 psi. Originally designed for aerospace hydraulic systems, the PTX 300 series utilizes micromachined piezo resistive silicon pressure measurement technology, continually developed and proven by Druck for 30 years.

 The product is packaged to suit the specific requirements of subsea hydraulic control systems.In particular, the high pressure containment rating, hydraulic transient protection and integrity of cable/electrical connections combine with the precision measuring technology to make the PTX 300 series a leader in this field.


PTX300 Component Diagram
P1 Process Connection: Customized Flush flange, Spigot, and SAE threaded connections available  in a wide range of material options to suit process and pressure rated requirements. product lead-time for short cycle projects
P1 GE’s propriety and extensively field proven piezo-resistive silicon technology for pressure measurement for full scale ranges from 70 bar/1000 psi to 1500 bar/21750 psi
P1 Compact analogue electronics package, qualified to ISO 13628-6.  +25 years design life.
P1 Subsea qualified straight or 90º over-mould cable or penetrator connections providing single or dual harness configurations
P1 ASME IX qualified electron beam welded housing in customized materials and hyperbaric use down to 3500 metres.


The Subsea Control Module (SCM) acts at the heart of the Subsea Production System (SPS), providing electronic and hydraulic control of subsea tree and manifold valves and instrumentation.  The hydraulic functions of the SCM are driven by the Directional Control Valves (DCV) that control the flow of fluid through the SCM to apply or vent hydraulic power to system valve actuators within the SPS.  The PTX 300 is employed to measure the pressure within the hydraulic circuit of the SCM, in particular its function is to verify the DCV’s are operating correctly.

The PTX 300’s proven reliability, performance, hyperbaric and seawater tolerant design in a compact package contribute to the
strong pedigree with over 30,000 units deployed for this application up until 2010.

The PTX 300 Series design and construction makes the sensor equally suitable for other subsea sensor applications including:-

  • Remote Operated Vehicle (ROV) Pressure Sensors
    High hyperbaric design and subsea reliability makes the PTX 300 series suitable for ROV hydraulic monitoring applications.
  • Rigless Intervention Equipment
    The PTX300’s seawater tolerance, rugged construction, wide pressure range and flexible platform means the sensor can easily be 
    adapted where pressure measurement is required on subsea intervention equipment such as a Subsea Lubricator system.


Pressure Range: Any zero based range from 70 bar to 1500 bar sealed gauge or absolute
Accuracy: <+/- 0.1% FS (non-linearity, hysteresis and repeatability)
Drift: <+/-0.1% FS/Year
Proof Pressure: 1.5x full scale range up to 1875 bar
Hyperbaric Containment up to 345 bar
Operating Temperature Range: -30°C to +50°C
Storage Temperature: -40°C to +80°C
Supply Voltage: 10 to 32 Vdc
Output Signal: 4-20mA (others available on request)
Output Response: 0.5ms (2KHz)
Resolution: Infinite
Media compatibility: Process: Inconel 625/Inconel 718 (To NACE MR 0175)
External: Options available (Stainless Steel 316L, Inconel 625) and Hypalon
Process Connection: custom – face seal/spigot/threaded
Hyperbaric Containment: up to 345 bar
Material Traceability: BS EN10204:3.1
Shock & Vibration: in accordance with ISO 13628-6 Q2
Sensor Mounting: Any orientation

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