Karl Fischer Water Content Tester
Using Karl Fischer coulometric titration, automatic electrolytic current control, and a 32-bit embedded microcontroller,
it delivers fast, reliable, and repeatable moisture analysis for power, petroleum, chemical, pharmaceutical, railway, pesticide, and environmental laboratories.
Product Overview
The ZWWS101 is designed for accurate determination of trace water content in a wide range of industrial and laboratory samples. Its Karl Fischer coulometric analysis generates iodine electrochemically and calculates the water content according to Faraday’s law, eliminating the need for manual titrant volume measurement.
With automatic endpoint control, blank-current compensation, digital sample parameter entry, and automatic result recording, the tester helps laboratory and maintenance personnel reduce manual calculation errors and improve testing efficiency. It is suitable for quality control, incoming material inspection, production monitoring, and preventive maintenance applications.
Instrument features：
- Utilizing 32 bit embedded microcontroller processor as the master control coreand embedded mini operatingsystem.
- Bestableand reliable because of constant pressure detection, high precision and rapid measuring speed.
- Simpleoperationand convenient digital calculation due to color touch screen and full digital keyboard.
- Four calculation formulas are included, which can meet the different requirementof customer.
- Miniaturethermalprinter with time record make searching more convenient.
- New profile is designed according to the
- Creative and optimal operating software will bring a different touch experiencefor you.
Technical Details
| Parameter | Specification |
|---|---|
| Titration method | Coulometric titration（Coulomb analysis） |
| Display | Color LCD touch screen |
| Electrolytic current control | 0～400mA automatic control |
| Measurement scope | 0 ug～200mg |
| Sensitive valve | 0.1µg H2O |
| Accuracy | 10µg～1000µg±3µg; More than 1mg but not greater than 0.3% |
| Power supply | 220V±10% 50Hz |
| Power | ＜ 40W |
| Ambient temperature | 5～40℃ |
| Ambient humidity | ≤ 85% |
| External dimension | 340×295×155mm |
| Weight | About 5.5kg |
Model Selection Guide
| Item NO. | Max Current | Measuring Range | Main Features | Recommended Application |
|---|---|---|---|---|
| GDZR-10A | 10A | 100μΩ - 20KΩ | Portable, built-in discharge alarm | Small to medium distribution transformers |
| GDZR-20A | 20A | 10μΩ - 10KΩ | High-speed testing, heat dissipation | Medium-sized power transformers |
| GDZR-40A | 40A | 1μΩ - 2KΩ | Dual-channel measurement, high current | Large-scale power transformers |
| GDZR-40A | Three-Phase 10A | 100μΩ - 10KΩ | Three-phase simultaneous measurement | Yn-type transformers, time-saving |
Recent Work
Parts List
| Item NO. | Max Current | Measuring Range | Main Features | Recommended Application |
|---|---|---|---|---|
| GDZR-10A | 10A | 100μΩ - 20KΩ | Portable, built-in discharge alarm | Small to medium distribution transformers |
| GDZR-20A | 20A | 10μΩ - 10KΩ | High-speed testing, heat dissipation | Medium-sized power transformers |
| GDZR-40A | 40A | 1μΩ - 2KΩ | Dual-channel measurement, high current | Large-scale power transformers |
| GDZR-40A | Three-Phase 10A | 100μΩ - 10KΩ | Three-phase simultaneous measurement | Yn-type transformers, time-saving |
Product Video
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Certificate
Frequently Asked Questions
Need more information about the ZWWS101? Contact our engineers for expert technical support and application guidance.
The ZWWS101 uses Karl Fischer coulometric titration. Iodine is generated electrochemically in the titration cell, and the instrument determines the water content according to the electrical charge consumed during the reaction. This method is suitable for trace moisture analysis in a wide range of samples.
The measurement range is 0 µg to 200 mg, with a sensitivity of 0.1 µg H₂O. The stated accuracy is ±3 µg for measurements from 10 µg to 1000 µg, and not greater than ±0.3% for measurements above 1 mg.
Yes. The ZWWS101 can measure liquid samples directly through the sample port. Solid samples can be introduced with a suitable solid sample injector or water evaporator. Gas samples can be tested with a compatible gas injector. For gas measurement, the manual specifies approximately 150 mL of electrolytic solution in the anode chamber and a stable gas flow of approximately 100 mL/min.
Before sample testing, the reagent must reach a normal and stable condition, and the blank current should be minimized. The ZWWS101 monitors blank-current-related values and can store the blank current caused by moisture absorbed from the air or titration cell.
Proper sealing, drying, reagent adjustment, and stable stirring are also important for obtaining reliable low-moisture results. Because the Karl Fischer reagent may contain odorous, toxic, and flammable components, reagent handling should be performed in a well-ventilated area or fume hood.
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