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OWC.001 Online Water Content Meter for Transformer Oil

The OWC.001 Online Water Content Meter is designed for continuous, real-time monitoring of moisture in transformer oil.

Moisture is one of the most damaging contaminants in transformer oil, as it directly reduces dielectric strength and accelerates insulation aging. The OWC.001 ensures accurate, reliable detection of both absolute water content (ppm) and relative water activity (aw), enabling operators to take proactive action before costly failures occur.

This instrument is suitable for power transformers, circuit breakers, oil purification plants, and industrial lubrication systems where oil quality is critical to reliable operation.

Key Features

  • Continuous online or offline monitoring of water in transformer oil

  • Displays water activity (aw), oil temperature (°C), and absolute water content (ppm)

  • RS232 output + optional dual 4–20 mA outputs for integration into SCADA/monitoring systems

  • Configurable relay alarm outputs for aw, temperature, or ppm values

  • High sensitivity with ±0.0003 aw resolution

  • Compact IP67-rated probe with durable IP65 housing

  • Customizable probe length and cable to suit installation requirements

  • Prevents costly transformer failures with predictive maintenance insights

Technical Specifications

Power Supply

  • DC 9V–33V (standard)

  • AC 220V/50Hz (optional)

Signal Output

  • RS232 serial

  • Dual 4–20 mA analog outputs (max load 500Ω, optional)

  • Two relay alarm outputs (optional, configurable for aw, T, ppm)

Moisture Measurement (Water Activity)

  • Range: 0–1 aw

  • Resolution: ±0.0003 aw

  • Accuracy: ±0.02 aw (0–0.8 aw)

  • Repeatability error: ±0.002 aw

  • Response time (with stainless steel filter): 10 min

Temperature Measurement

  • Range: –20°C to +80°C

  • Resolution: 0.015°C

  • Accuracy: ±0.5°C (0–80°C)

  • Repeatability: ±0.2°C

  • Response time: 30 s

Absolute Water Content

  • Range: 0–1000 ppm

Operating Conditions

  • Oil temperature: –40°C to +125°C

  • Maximum oil pressure: 10 bar

Protection

  • Probe: IP67

  • Housing: IP65

Probe & Cable

  • Standard cable length: 1 m (customizable)

  • Probe length: customizable per requirement

Application

  • Power transformers

  • Circuit breakers

  • Oil purification plants

  • Industrial lubrication systems

  • Substations and power distribution

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