Moisture content in oil can significantly affect the performance and service life of various systems and devices. Excessive moisture can lead to corrosion, contamination, or dirt deposits. All of this results in reduced performance, downtime, high repair costs and even complete system failure.
Thus, continuous monitoring of moisture content in oil is an important part of oil quality management.

FO 510: Built-in Oil Moisture Measurement
- The FO 510 moisture sensor from IZMERKON is compact and durable, specially designed for built-in oil moisture monitoring.
- FO 510 provides maximum accuracy, stability, and durability when working with various oils, including lubricating, hydraulic, and transformer oils, as well as diesel fuel.
Technical specifications of FO 510:
- Measurement of relative water saturation in oil as water activity (aw) and process temperature (°C/°F). Measurement is independent of oil type or its age.
- Signal output is provided via two freely assignable analog outputs (4...20 mA), as well as a digital Modbus RTU interface (RS 485).
- Heat resistance up to +125 °C.
- Sealing up to 300 bar.
Why is measuring oil moisture so important?
Excessive moisture content in oil can lead to fatal consequences:
- Corrosion and wear: Reduces system service life and decreases efficiency.
- Contamination and deposits: Clogging of filters and pipelines leads to reduced performance and costly repairs.
- Lubricating film breakdown: equipment component protection is no longer guaranteed, increasing the risk of expensive failures.
- Oil insulation: With increasing water content, insulation capability sharply decreases.
Our new oil condition sensor FO 510 with a capacitive moisture sensor offers several advantages.
- High accuracy: The capacitive sensor has high sensitivity and allows precise measurement of moisture content in oil even at low humidity levels.
- Durability: The sensor is robust and long-lasting, suitable for harsh conditions.
- Fast response time: Quick alerts to system changes.
- Easy installation: The measuring device is easily installed using a ½" thread.
Here are some examples of application areas where FO 510 can be used
- Power plants: Measuring moisture content in turbine oil is important for maintaining turbine performance and service life.
- Oil and gas industry: Measuring moisture content in oil in feed pumps and other equipment is important to prevent corrosion and deposits.
- Manufacturing: Measurement of moisture content in hydraulic oil and other lubricants is important for maintaining equipment performance and lifespan.
- Substations: Moisture contained in transformer oil can affect the safety and lifespan of the transformer.
For more information about the instruments, you can contact IZMERKON by phone at +7 (812) 309 56 05 or via the feedback form.

