NP330-F Water in oil sensor

Measure water in oil

Whether in hydraulic oils, diesel, vegetable oils, Skydrol or other user-specific fluids: the NP330-F measures the water content up to the saturation limit. Specially calibrated for your application and the oils and fluids used – for example in drying and oil treatment plants, production plants for vegetable oils, hydraulic systems and especially for monitoring oil coolers.



How we measure success: Your advantages.

Custom calibration

Calibration on the user-specific fluids and requirements

Temperature compensation

Elimination of influence of temperature changes on the measured value

High measuring accuracy

Through multi-point calibration and temperature compensation

Fast reaction time

Fast response to humidity change

High compressive strength

Patented pressure resistance up to 300 bar

Long product life cycles

Designed for industrial use and long-term spare parts availability

Technology at a glance

See here how the water in oil sensor is constructed and which components make up its functionality. We will be happy to show you more, live or online, during a consultation.

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Mission Oil Check:
the NP330-F

For all those who like to take a closer look. Our photo gallery shows you the product in detail, as a whole and from different perspectives and in different situations.

Technical information

Inline measurement of the absolute water content
The NP330-F water in oil sensor is designed for in-line measurement of absolute water content in ppm [mg/kg] below the saturation limit. The sensor performs its work in mineral, ester, skydrol, silicone, vegetable, diesel, refrigerator, transformer and insulating oils, among others, as well as in other customer-specific fluids.

The fields of application

  • Drying and oil treatment plants
  • Production plants for vegetable oils
  • Painting lines for automotive parts
  • Oil cooler monitoring
  • Hydraulic systems
  • Refrigerator oil
  • Hardening shops
  • Aircraft industry
Current output4–20 mA
Serial interfaceRS232
Switching output24 V DC
Typical measuring range10 – 40,000 ppm (upper range limited to saturation of the oil)
Temperature liquid-20°C to +70°C (higher media temperatures on request)
Supply18 – 24 V DC / max. 70 mA
System pressureup to 300 bar
Installation depth50 mm with ½-inch thread
Protection classIP65

Intelligent accessories

Mobile data logger P005

For temporary supply and readout of permanently installed sensors at locations without infrastructure.


How is the product maintained?

We recommend an annual recalibration and adjustment for all our sensors to be able to guarantee the exact functionality. We calibrate our sensors with state-of-the-art measurement technology in our in-house calibration laboratory. Our test equipment is one of the most accurate references in measurement and control technology. The test results are summarised in a factory calibration certificate in accordance with DIN EN ISO/IEC 17025:2018-03.

Ready for download

Simply download the latest product information here. Do you have further questions about iocto and our products? We are happy to be there for you.