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Views: 0 Author: Site Editor Publish Time: 2025-06-05 Origin: Site
Brake fluids are inherently hygroscopic, meaning they absorb moisture from the surrounding environment. As water content increases, boiling point decreases, corrosion risk rises, and hydraulic efficiency is compromised. The Brake Fluid Water Content Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. is designed to accurately quantify water concentration in brake fluids, enabling maintenance teams and formulators to certify fluid performance and preserve braking reliability.
In modern hydraulic brake systems, even a small percentage of water (as low as 2–3 % by volume) can reduce the fluid’s boiling point significantly. Under repeated or heavy braking, vapor pockets can form, leading to spongy pedal feel or complete brake failure. Additionally, moisture accelerates internal corrosion of master cylinders, calipers, and ABS modules. By determining water content routinely, service centers can schedule timely fluid changes, and formulators can verify additive packages that limit water pickup.
The instrument employs a Coulometric Karl Fischer titration module—a gold-standard method for trace water quantification. After a precise aliquot (e.g., 0.5–1.0 mL) of brake fluid is introduced into the sealed titration cell, the system releases iodine reagent at a controlled rate. Electrodes measure the microampere current related to iodine consumption, which is stoichiometrically proportional to water concentration in the sample. Results are reported in parts per million (ppm) or percentage by weight, with typical detection limits down to 10 ppm.
Key steps include:
Sample Injection: A gas-tight syringe introduces a precisely metered volume into the dry titration vessel.
Titration: Iodine is generated coulometrically, reacting with water to form hydrogen iodide.
End-point Detection: A bipotentiometric sensor detects excess iodine, triggering titration termination.
Calculation: The instrument software computes water content using a known cell constant, sample mass, and titration charge.
Sealed Titration Cell: Prevents atmospheric moisture ingress and ensures measurement integrity.
Built-in Drying System: A desiccant module or dry gas purge maintains low humidity around the titration cell.
High-Precision Balance Integration: Some configurations include an on-board analytical balance for sample mass verification, reducing operator steps.
Intuitive Touchscreen Interface: Guides users through sample entry, titration parameters, and data review.
Automated Calibration Routines: Periodic check with certified water standards keeps accuracy within ±1 % relative.
Automotive Maintenance Centers: Fleet shops and dealer service bays use the tester during routine brake fluid flush intervals (typically every 1–2 years).
Brake Fluid Manufacturers: R&D labs verify formulation resistance to moisture pickup during storage and after accelerated aging.
Independent Testing Facilities: Third-party labs certify that fluids meet ISO 4925 or SAE J1703 standards for maximum allowable water content.
Performance Vehicle Workshops: High-performance and motorsport teams rely on precise water analysis to ensure brake safety under elevated temperatures.
Sample Handling: Avoid prolonged exposure to ambient air. Draw fluid directly from the reservoir or a freshly bled sample port.
Syringe Preparation: Use gas-tight syringes that have been baked or dried to prevent moisture adsorption.
Titrant Quality: Replace Karl Fischer reagents per the manufacturer’s shelf-life and store them sealed with desiccant packs.
Cell Care: Clean the cell compartment and stirrer periodically to remove deposits that may affect end-point detection.
Routine Verification: Perform blank titrations (empty vessel) weekly to verify background moisture levels and carry-over.
By maintaining strict quality control on water content, brake fluid users can avert safety risks, prolong component life, and guarantee consistent hydraulic performance.
