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KT‑300 Online Oil Moisture Detector

The KT-300 is a fast, reliable, and accurate online detector for water activity (aw) in oil and temperature (T). Designed with a rugged stainless-steel housing, it is highly suitable for OEM integration and continuous monitoring in harsh environments. The KT-300 is ideal for real-time monitoring of lubrication, hydraulic, and insulation oils, providing valuable data for preventive maintenance and extending the service life of transformers and industrial machinery.

Key Features

  • Continuous measurement of water activity (aw) in oil and temperature

  • Calculates moisture content in ppm for transformer oil

  • High accuracy and robust performance in hostile environments

  • Convenient local and remote calibration options

  • Excellent tolerance to pollution and pressure

  • Compact design for easy integration into systems

  • Supports both analog and digital output signals

Technical Specifications

Water Activity Measurement

  • Range: 0 … 1 aw

  • Accuracy:

    • 0 … 0.6: ±0.02 aw

    • 0.6 … 0.9: ±0.03 aw

    • 0.9 … 1: ±0.04 aw

  • Resolution: 0.001 aw

  • Response time (typical): <1 min

Water in Oil Measurement

  • Range: 0 … 100 ppm, 500 ppm, 1000 ppm, 2000 ppm (customizable)

  • Accuracy: ±10% or 10 ppm (whichever is higher)

Temperature Measurement

  • Range: –40°C to +120°C

  • Accuracy (at +25°C): ±0.2°C

  • Operating temperature: –40°C to +80°C

  • Storage temperature: –40°C to +80°C

  • Oil temperature: –40°C to +120°C

Outputs

  • Digital: RS485 MODBUS RTU

  • Analog: 4–20 mA, resistive load 500 Ω

Electrical & Mechanical

  • Housing: 316 stainless steel

  • Weight: 200 g (transmitter), 270 g (package)

  • Package size: 172 × 117 × 53 mm

  • Protection: IP66

  • Mechanical connections: G 1/2″ ISO or 1/2″ NPT

  • Pressure range: ≤100 bar (other ranges available on request)

  • Resistance load: 200 … 500 Ω

  • Supply voltage:

    • DC 9–36 V (RS485)

    • DC 15–36 V (@4–20 mA)

  • Supply current: <5 mA + load current

  • Cable: M8 × 1, 6-pin, length 2 m

Standards Compliance

  • CE certified

  • EN 61326-1

  • EN 61000-3

  • EN 61010 Class B

Options & Accessories

  • Stainless steel filter

  • USB-RS485 converter

  • USB-RS232 converter

  • Seal washer (ISO G1/2”)

  • Connecting cables:

    • 5 m, M8 screw thread, 90° bend angle

    • 10 m, M8 screw thread, 90° bend angle

    • 2 m, M8 screw thread, with LED light

  • KT-200D display and control unit (optional)

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