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M‑Series OLT Oil Breakdown Voltage Tester

The OLT-80M, OLT-90M, and OLT-100M are compact and lightweight automatic oil testers designed for accurate breakdown voltage measurement of insulating liquids. Engineered with operator simplicity and precision in mind, the M-Series measures test voltage directly on electrodes and stores results in non-volatile memory. Data transfer via PC connectivity enables easy storage, analysis, and reporting.

With a true sine voltage waveform independent from the supply source, these testers ensure repeatable, accurate, and reliable test results. Safety is prioritized through automatic high-voltage breakers that immediately cut off voltage if the tester lid is opened. Each unit comes fully equipped with a test vessel, IEC 60156 mushroom-type electrodes, and Go/No-Go gauge.

The M-Series emphasizes ultra-simplicity — load the vessel, press the start button, and obtain results instantly. A built-in magnetic stirrer ensures proper liquid mixing between measurements.

Model Options

Key Features

  • Compact, lightweight design with high reliability

  • Direct electrode voltage measurement for accuracy

  • Non-volatile memory for result storage

  • USB PC connectivity for easy report generation

  • Magnetic stirrer for consistent liquid mixing

  • Automatic HV cutoff for enhanced operator safety

  • Conforms to IEC 60156 and other international standards

  • Fully operational out of the box with supplied vessel and electrodes

Technical Specifications

Output AC Voltage (symmetrical)

  • OLT-80: 80 kV rms

  • OLT-90: 90 kV rms

  • OLT-100: 100 kV rms

Voltage Resolution

  • 0.1 kV

Measurement Uncertainty

  • 3% of reading

Output Voltage Rise Rate

  • 2 ± 0.2 kV/s (changes per selected standard)

Switch-off Time on Breakdown

  • < 5 μs

Temperature Measuring Range

  • 5.0 – 50.0 °C

Programmed Test Sequences

  • IEC 60156 (BS EN 60156, CEI EN 60156, NF EN 60156, UNE EN 60156, SABS EN 60156, PA SEV EN 60156)

  • GOST 6581

  • ASTM D877 & ASTM D1816 (optional)

Electrodes

  • IEC 60156 mushroom type (basic)

  • ASTM D877 / ASTM D1816 optional

Test Vessel

  • IEC 60156, 400 ml, 1.0 kg

Go/No-Go Gauge Width

  • Basic: 2.45 / 2.55 mm

  • Optional: 1, 2, 2.5, 4 mm

Display Resolution

  • 128 × 64 dot matrix, monochrome

Interface Languages

  • English, Russian, Turkish

Printer

  • Thermal line, 8 dots/mm, 384 dots

Memory for Results

  • 512 cells

PC Connectivity

  • USB B-type

Input Voltage

  • 230V ±10% (110/120V available on request)

Line Frequency

  • 50 / 60 Hz ±1

Power Consumption (VA max)

  • OLT-80: 100

  • OLT-90: 120

  • OLT-100: 140

Dimensions (W × H × D, mm)

  • OLT-80: 461 × 280 × 271

  • OLT-90: 420 × 300 × 320

  • OLT-100: 530 × 315 × 320

Net Weight (kg)

  • OLT-80: 21

  • OLT-90: 25

  • OLT-100: 30

Function

  • Provides automatic dielectric breakdown voltage testing for insulating liquids

  • Measures test voltage directly on electrodes for increased repeatability

  • Supports multiple international test standards (IEC, GOST, ASTM)

  • Ensures operator safety with automatic HV shutdown if lid is opened

  • Stores results for traceability and allows PC-based reporting

  • Designed for laboratory and field testing applications

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