XHWS180 Trace Moisture Tester Karl Fischer Coulometric Titration — Precision Water Content Analysis per GB/T 7600
Product Overview
The XHWS180 Trace Moisture Tester employs the Karl Fischer coulometric titration method in strict accordance with the GB/T 7600 standard, representing the most reliable approach for measuring trace moisture content across diverse substances. The instrument successfully implements this methodology through an advanced automatic control circuit built around a 32-bit embedded microprocessor with an integrated mini operating system, delivering exceptional reliability and operational convenience.
Featuring 0~400mA automatic electrolysis current control, the XHWS180 achieves high-precision measurement with rapid analysis speed. It incorporates four built-in calculation formulas with automatic unit conversion (mg/L, %, PPM), graph curve analysis for water content trend visualization, and a large color touch screen with full digital keyboard input. The instrument supports seamless Chinese/English language switching, making it suitable for international laboratory environments across petroleum, chemical, electric power, railway, pesticide, pharmaceutical, and environmental protection sectors.
Key Features
- Karl Fischer Coulometric Method: Gold-standard titration technique per GB/T 7600 for the most reliable trace moisture quantification
- 32-Bit Embedded Processor: High-performance microcontroller with mini operating system for stable, long-term reliable operation
- Automatic Electrolysis Control: 0~400mA intelligent current regulation adapts to sample water content for optimal measurement speed and precision
- High-Precision SMD Components: Premium surface-mount technology on the mainboard ensures high integration, simple operation, and extended service life
- Multi-Formula Calculation: Four built-in formulas with automatic unit conversion between mg/L, %, and PPM for flexible reporting
- Graph Curve Analysis: Real-time water content trend visualization for enhanced data interpretation and quality control
- Color Touch Screen Interface: Large color LCD with full digital keyboard for intuitive operation and rapid data entry
- Built-in Thermal Printer: Immediate on-site result documentation without external equipment
- Bilingual Support: Chinese and English interface switching for international laboratory deployment
- Wide Application Range: Suitable for transformer oil, petroleum products, chemicals and environmental samples
Technical Specifications
| Measurement Performance |
| Titration Method |
Karl Fischer Coulometric Titration (Coulometric Analysis) |
| Reference Standard |
GB/T 7600 |
| Measuring Range |
1μg ~ 200mg |
| Sensitivity |
0.1μg H2O |
| Accuracy |
10μg~1000μg ±10% |
| Electrolysis Current Control |
0~400mA Automatic Control |
| Calculation Formulas |
4 Built-in (mg/L, %, PPM) with Auto Conversion |
| Hardware & Interface |
| Processor |
32-bit Embedded Microprocessor with Mini OS |
| Display |
Color LCD Touch Screen with Digital Keyboard |
| Data Output |
Built-in Micro Thermal Printer, Digital Export |
| Data Analysis |
Graph Curve Analysis for Water Content Trends |
| Language |
Chinese / English Switchable |
| Operating Specifications |
| Power Supply |
AC 220V±10%, 50Hz |
| Power Consumption |
<40W |
| Operating Temperature |
5℃~40℃ |
| Operating Humidity |
≤85% |
| Physical Specifications |
| Dimensions |
380 × 310 × 180mm |
| Weight |
Approx. 6kg |
Frequently Asked Questions
Q1: How does Karl Fischer coulometric titration work for moisture measurement?
The XHWS180 operates on the Karl Fischer reaction principle (I2+SO2+H2O), where iodine is generated electrolytically at the anode. The amount of iodine produced is directly proportional to the electric charge per Faraday's law. When a sample is injected, water reacts with the generated iodine. The instrument measures the electrolysis current required to produce the consumed iodine, calculating the exact water content. The 0~400mA automatic current control system adapts to the sample's moisture level, ensuring maximum speed at high water content and maximum precision at trace levels.
Q2: What is the measurement range and what types of samples can be tested?
The XHWS180 measures water content from 1μg to 200mg with 0.1μg sensitivity and ±10% accuracy in the 10μg-1000μg range. It is designed for liquid, solid, and gas samples across multiple industries: transformer insulating oil (electric power), petroleum products, chemical reagents, pharmaceutical ingredients, pesticide formulations, and environmental samples. The four built-in calculation formulas automatically convert results to mg/L, percentage (%), or PPM based on sample weight, volume, or density inputs.
Q3: How does the graph curve analysis feature improve testing efficiency?
The XHWS180 provides real-time graphical curve display of the water content titration process, enabling operators to visually monitor the reaction progress, identify endpoint stability, and detect anomalies such as side reactions or electrode contamination. The curve data helps users analyze moisture trends across multiple samples, optimize electrolyte replacement schedules, and validate measurement consistency—capabilities typically found only in higher-priced laboratory-grade instruments.
Q4: What maintenance is required and how often should the electrolyte be replaced?
Under normal conditions, 100mL of electrolyte can react with up to 1g of water before replacement is needed. Signs requiring electrolyte replacement include: prolonged measurement times, decreased sensitivity, increased blank current, poor reproducibility, or visible reddish-brown discoloration in the cathode chamber. The instrument features simple front-access electrode connections and a magnetic stirrer for easy cell maintenance. Regular maintenance includes weekly rotation of ground joints with vacuum grease, timely replacement of silica gel desiccant (when color changes from blue), and periodic cleaning of electrode plugs and sockets with ethanol .
Q5: What accessories are included and what are the MOQ/payment terms for procurement?
Each XHWS180 includes the main unit, complete titration cell assembly (electrolytic cell, electrolysis electrode, measuring electrode, drying tube, 3 grinding plugs, stirring bar, injection grinding plug, color-changing silica gel), power cord, 0.5μL and 50μL microinjectors, 1mL injector, closed needle (9#), 10 silicone pads, vacuum grease, Karl Fischer electrolyte (1 bottle), pipette, and 4 cotton balls. Minimum order quantity is 1 unit with payment via T/T or L/C. Standard delivery is 5-10 working days in a protective carrying case. Annual supply capacity reaches 500 units. Each instrument includes a 12-month warranty with lifetime technical support.
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