Application Overview

Hydraulic fluids are used in demanding industrial environments where water contamination can lead to:

Reduced lubrication performance
Corrosion of system components
Cavitation damage
Decreased equipment reliability

Accurate moisture determination across a wide concentration range is essential for preventive maintenance and quality assurance.

This application demonstrates dual-channel Karl Fischer titration for water content analysis in hydraulic fluids — covering trace ppm levels through high percentage concentrations using a single integrated platform.

Analytical Challenge

Hydraulic fluids may vary significantly in water content depending on:

Storage conditions
System contamination
Fluid formulation (ester-based vs. water-glycol fluids)

Single-mode systems may struggle to maintain accuracy across such a wide range.

Dual-Channel Karl Fischer Solution

By combining:

Coulometric Karl Fischer titration for ppm-level moisture
Volumetric Karl Fischer titration for higher moisture levels

The Hiranuma MOICO-A19 and MOIVO-A19 platform enables:

Parallel titration
Wide dynamic measurement range
Stable endpoint detection
Modern data handling

This configuration allows one integrated system to cover moisture ranges from trace ppm levels up to high percentage concentrations.

Laboratories currently operating single-channel Karl Fischer systems may benefit from evaluating dual-channel configurations to improve flexibility across wide moisture ranges.

Instrument Platforms for This Application

Trace Moisture (ppm range)

Hiranuma MOICO-A19 Coulometric Karl Fischer Titrator

Higher Moisture Levels (% range)

Hiranuma MOIVO-A19 Volumetric Karl Fischer Titrator

Optional Sample Preparation Enhancement

EV-2000L Oil Evaporator
Recommended for insoluble or difficult matrices.

Download the Full Application Note

For complete experimental details and representative data:

→ Download the Full Hydraulic Fluid Application Note (PDF)

Discuss Upgrade Options

Still operating an AQ-300 or AQV-300?

Dual-channel capability is not available on legacy systems.

→ Discuss dual-channel configuration
→ Request upgrade consultation