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Key: test item, instrument name, total nonvolatile migration, gravimeter, moisture permeameter

Product

Trace Moisture Analyzer - Electrolytic Method

uW-E-100
Focusing on packaging and material testing technology, we are committed to quality control in industries such as healthcare, pharmaceuticals, food, packaging, textiles, and new materials. Our products are widely used in enterprises, testing institutions, universities, and research institutes.

Category:

Hygrometr, Moisture and Dew Point

Trace Moisture Analyzer

Coulometric Electrolytic Moisture Analyzer for Solid Materials

Functions

Determine the total water content in solid samples including rubber pellets, resin raw materials, melt-blown non-wovens, desiccants, fibers, rocks, and surgical sutures.

Quantify moisture from trace levels up to 5 % by weight using the absolute coulometric electrolysis method.

Essential for polymer manufacturing, pharmaceutical raw material QC, chemical processing, and materials research.

Working Principle

The instrument employs the coulometric electrolysis method using a phosphorus pentoxide (P₂O₅) micro-moisture sensor.

The test sample is placed in a sealed, constant-temperature test chamber.

The chamber is heated (up to 300 °C) to volatilize moisture from the solid matrix.

Ultra-dry carrier gas (99.999 % high-purity nitrogen) sweeps the volatilized water vapor through the electrolysis cell.

Inside the cell, P₂O₅ absorbs the water and undergoes electrolysis, generating a current directly proportional to the mass of water.

The embedded microprocessor integrates the current over time to calculate the total water content (in micrograms or % by weight) of the original solid sample.

Because the P₂O₅ sensor measures the absolute mass of water electrolyzed, no prior calibration with standard materials is required - making it a true primary method.

Compliant Standards

ISO 15512:2019 - Plastics - Determination of water content(coulometric electrolysis method for plastics and related materials)

ASTM D6869-17 - Standard Test Method for Coulometric Determination of Water in Plastics and Other Solid Materials

ASTM D5460-02(2017) - Standard Test Method for Rubber Compounding Materials-Volatile Loss(moisture determination reference)

GB/T 22313-2008 - Plastics - Determination of water content - Coulometric electrolysis method

Key Features

Absolute Measurement (No Calibration Needed): The P₂O₅ electrolytic sensor provides a fundamental, calibration-free measurement of water mass - results are traceable to SI units.

Gradient Heating Control: Programmable, step-wise temperature ramping prevents sample boiling, splashing, or decomposition. Ensures complete moisture release without altering the water content value.

High Accuracy & Stability: Temperature control accuracy of ±0.5°C; sensor error as low as 1 ppm in the carrier gas stream.

Error Compensation: Automatically measures and deducts systematic errors (blank cell background) and sample-loading errors for precise, artifact-free results.

Pollutant Isolation: A proprietary cooling and separation system condenses and traps volatile contaminants (plasticizers, oils, solvents) before they reach the sensor, dramatically extending sensor life.

Fully Automatic Operation: One-button start, fully intelligent process control, digital parameter setting. No mechanical knobs. Automatic data saving even during power interruptions.

Sample Loading Alarm: Audible/visual prompt ensures the operator correctly places the sample before test initiation.

Self-Diagnosis: Built-in fault detection at startup prevents testing in a compromised state (e.g., gas flow failure, temperature sensor error).

Professional Software: Graphical, full-process monitoring with real-time curves, multi-factor data logging, and customizable report formats.

GMP-Ready (Optional): Optional Computerized System module adds user management, access control, and audit trail for 21 CFR Part 11 compliance.

Technical Specifications

Name	Parameter	Name	Parameter
Water content	0~5%	Measurement error	1.22*10 - 3 ug / s
Sensor error	1ppmv	Electrolysis rate	3.68 ug / s
Sample capacity	10~12 ml (others need to be customized)	Sample-adding path diameter	<9mm (others need to be customized)
Temperature range	Room temperature to 300℃	Temperature control error	±0.5℃
Carrier gas type	99.999% high - purity nitrogen	Carrier gas flow rate	100 cm3/min
Working air pressure	0.1~0.2 MPa	Interface size	1/8 - inch metal tube
Power supply	AC 220/110V 50/60Hz	Power	<1800W
Dimensions (mm)	415(L)×720(W)×400 (H)	Net weight of the main unit	42 (kg)

Standard Configuration

Main testing unit (host)

Test computer with professional software

Agilent water trap (pre-filter for carrier gas)

Nitrogen cylinder pressure reducer

Operation manual and calibration certificate

User-Provided Items

High-purity nitrogen (99.999%)

Funnel (for sample loading)

High-temperature gloves

Application Industries & Scenarios

Polymer & Plastics Manufacturing

Resin Raw Materials: Measure moisture in PE, PP, PET, PA (nylon), PC, ABS pellets before extrusion or molding to prevent hydrolysis and void formation.

Masterbatches & Compounds: Verify dryness of color concentrates and additive masterbatches.

Melt-Blown Non-Wovens: Test moisture in polypropylene feedstock for filtration media and hygiene products.

Rubber & Tire Industry

Rubber Compounding: Determine volatile loss and moisture in natural rubber, SBR, EPDM, and nitrile rubber to ensure consistent vulcanization.

Carbon Black & Fillers: Verify dryness of reinforcing fillers before mixing.

Pharmaceutical & Medical Materials

API Powders: Quantify moisture in active pharmaceutical ingredients that are sensitive to Karl Fischer reagents.

Surgical Sutures: Measure water content in absorbable and non-absorbable sutures per pharmacopoeia requirements.

Desiccants & Molecular Sieves: Certify water absorption capacity and residual moisture.

Chemical & Mineral Processing

Rocks & Minerals: Analyze bound and free water in geological samples for exploration and processing control.

Catalyst Powders: Determine moisture that could deactivate catalyst sites during reaction.

Adhesives & Sealants: Test solid resin components for moisture-induced curing issues.

Research & Third-Party Testing

Materials Science: Study moisture absorption/desorption kinetics of novel polymers and composites.

Failure Analysis: Investigate moisture-related defects in molded parts, films, and coatings.

CNAS/CMA-Compliant Testing: Issue reports referencing ISO 15512 or ASTM D6869.

Frequently Asked Questions (FAQ)

Q1: How is this different from a Karl Fischer moisture titrator?

A: Karl Fischer (KF) titration uses a chemical reagent that reacts stoichiometrically with water. It requires periodic reagent replacement, electrode maintenance, and can suffer from side reactions with ketones, aldehydes, or oxidizers. The coulometric electrolysis method uses a P₂O₅ sensor that physically absorbs and electrolyzes water - no consumable reagents, no chemical side reactions, and no electrode fouling. It is particularly advantageous for polymers, rubbers, and materials incompatible with KF chemistry.

Q2: Which international standard should I reference?

A: For plastics and solid polymeric materials, ISO 15512:2019 is the primary international standard. In North America, ASTM D6869-17 is widely accepted. For rubber compounding materials, ASTM D5460-02(2017) provides the relevant methodology.

Q3: What is "gradient heating" and why is it important?

A: Gradient heating applies temperature in programmable steps rather than a single abrupt setpoint. For example: 80 °C for 10 min, then 120 °C for 15 min, then 180 °C. This prevents boiling, splashing, or thermal decomposition of the sample, which could lead to inaccurate moisture readings or sensor contamination. It ensures complete, gentle moisture release.

Q4: How does the pollutant isolation system work?

A: As the carrier gas exits the heated chamber, it passes through a cooled trap that condenses high-boiling volatiles (plasticizers, oils, solvents, oligomers) before they reach the P₂O₅ sensor. Only water vapor (and inert gas) continues to the sensor. This dramatically extends sensor life and prevents false readings from non-water contaminants.

Q5: What carrier gas is required and why?

A: The instrument requires 99.999 % high-purity nitrogen (ultra-zero grade). Any moisture in the carrier gas would be counted as sample moisture, causing a positive error. The built-in Agilent water trap further polishes the nitrogen to ensure a near-zero background.

Q6: Can the instrument test liquids?

A: This model is optimized for solid samples. Liquids require a different sample introduction method (e.g., syringe injection into a heated evaporator). Please contact us for liquid-sample configurations.

Q7: Is the GMP module necessary for pharmaceutical use?

A: If your laboratory operates under FDA 21 CFR Part 11 or NMPA GMP guidelines, the optional Computerized System module is strongly recommended. It provides user authentication, role-based access, electronic signatures, and an audit trail - all required for regulated environments.

Function
It is used to determine the water content of test samples, including high - molecular materials such as rubber particles, resin raw materials, melt - blown non - woven fabrics, desiccants, fibers, rocks, sutures, etc.
Working Principle
Electrolytic of water method.
The test sample is placed in a sealed constant - temperature test chamber. The water volatilized from the test sample is carried by dry nitrogen (carrier gas) to the micro - water electrolysis sensor. The sensor electrolyzes all the water in the carrier gas and calculates the water content of the test sample.
Compliance Standards
Electrolytic analysis method, including GB/T 22313 - 2008, ISO 15512:2019, ASTM D5460 - 02(2017), ASTM D6869 – 17, etc.
Product Features
- The electrolytic micro - water sensor enables absolute value measurement with high accuracy.
- Temperature control: It features parameterized settings, gradient heating, high accuracy, stability and reliability, and overload protection.
- Fully automatic: There are no mechanical knobs. It can be started with a single button and is fully intelligent throughout the process. Data can be saved in case of power failure.
- Error measurement: It can measure both systematic errors and sample - loading errors, and deduct systematic errors for precise measurement.
- Sample loading: It provides an alarm prompt for sample loading.
- Sensor protection: It cools and separates the polluting substances volatilized from the test sample to prevent them from entering the sensor.
- Self - detection of startup faults to avoid testing in a faulty state.
- Software: It offers graphical, full - process, and all - factor monitoring, along with multiple report formats.
- Optional: GMP "Computerized System" function module.

Technical Specifications

Name	Parameter	Name	Parameter
Water content	0~5%	Measurement error	1.22*10 - 3 ug / s
Sensor error	1ppmv	Electrolysis rate	3.68 ug / s
Sample capacity	10~12 ml (others need to be customized)	Sample-adding path diameter	<9mm (others need to be customized)
Temperature range	Room temperature to 300℃	Temperature control error	±0.5℃
Carrier gas type	99.999% high - purity nitrogen	Carrier gas flow rate	100 cm3/min
Working air pressure	0.1~0.2 MPa	Interface size	1/8 - inch metal tube
Power supply	AC 220/110V 50/60Hz	Power	<1800W
Dimensions (mm)	415(L)×720(W)×400 (H)	Net weight of the main unit (kg)	42

System Configuration
Main unit, test computer, professional testing software, Agilent water trap, nitrogen cylinder pressure reducer.
Prepared by the User
High - purity nitrogen, funnel, high - temperature gloves.

Keywords:

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