Semi-Automatic Karl Fischer Coulometric Moisture Analyzer for Industrial Trace Water Testing HM-WS1

Product Introduction

Trace moisture content is a critical quality parameter across multiple industrial sectors. In the petroleum industry, water in fuels and lubricants accelerates corrosion and degrades performance; in pharmaceuticals, residual moisture affects drug stability and shelf life; in the chemical industry, water contamination can compromise product purity and reaction yields. Karl Fischer coulometric titration is the internationally recognized reference method for accurate trace water determination, but the cost of fully automated titrators can be prohibitive for smaller laboratories or facilities with moderate testing volumes.

The HM-WS1 addresses this gap by offering the Karl Fischer coulometric method in a semi-automatic, budget-friendly format. The instrument employs the coulometric titration principle, where iodine generated electrolytically reacts quantitatively with water in the sample according to the I₂/SO₂/water reaction. With a measurement range spanning 0.0001% (1 ppm) to 100% and a sensitivity threshold of 0.1 μg H₂O, the HM-WS1 covers the full scope of trace moisture determination requirements encountered in routine industrial quality control.

Operation is straightforward: the automatic stirring control ensures consistent mixing, and a typical determination completes in approximately 60 seconds without manual intervention. The sealed titration cell bottle prevents Karl Fischer reagent from contacting the operator, addressing a common safety concern with traditional open-cell titration setups. For laboratories testing diverse sample types, compatible solid and liquid sample injectors enable indirect moisture measurement of non-liquid materials.

The LED five-digit decimal display provides unambiguous numerical readout without the complexity of touchscreen navigation, making the instrument accessible to operators with minimal analytical training. Electrolysis current is automatically controlled up to a maximum of 400 mA, optimizing titration speed while maintaining measurement accuracy. Compliant with 23 national and industry standards (GB/T and SH/T series), the HM-WS1 is suitable for petroleum, chemical, pharmaceutical, pesticide, and electric power applications where reliable trace moisture data is required without the capital investment of a fully automated system.

Applications

• Petroleum industry: moisture determination in fuels, lubricating oils, and insulation oils per GB/T and SH/T standards

• Chemical manufacturing: trace water content in solvents, raw materials, and intermediate products

• Pharmaceutical industry: residual moisture testing in drug substances and excipients

• Pesticide production: water content measurement in pesticide formulations

• Electric power: insulation oil moisture analysis for transformer maintenance

• Laboratory quality control: routine trace water determination in liquid and solid samples

Key Features & Advantages

1. Karl Fischer coulometric titration principle with quantitative I₂/SO₂/water reaction for accurate trace moisture results

2. Semi-automatic operation with automatic stirring control for reliable and straightforward daily use

3. Budget-friendly design providing the coulometric method without the cost of full automation

4. Wide measurement range from 0.0001% (1 ppm) to 100% covering trace to high moisture levels

5. Sensitivity threshold of 0.1 μg H₂O for reliable trace-level water detection

6. Automatic determination completing in approximately 60 seconds

7. Sealed titration cell bottle preventing operator exposure to Karl Fischer reagent

8. Compatible with solid and liquid sample injectors for indirect measurement of diverse materials

9. LED five-digit decimal display for clear, unambiguous numerical readout

10. Electrolysis current automatically controlled up to 400 mA for optimized titration speed

11. AC 220V ±10% power supply compatible with standard laboratory mains without special requirements

12. Operating temperature range of 5–40°C suitable for standard laboratory environments

13. Compliance with 23 national and industry standards (GB/T, SH/T series) for regulated testing

14. Simple operation interface accessible to personnel with minimal analytical training

Technical Specifications

FAQ

Q1: What is the difference between coulometric and volumetric Karl Fischer titration?

Coulometric Karl Fischer titration generates iodine electrolytically within the titration cell, making it suitable for trace moisture determination at very low water content levels (typically below 1% or down to 1 ppm). The total charge passed during electrolysis directly quantifies the water content. Volumetric titration, by contrast, delivers iodine from a burette and is more appropriate for samples with higher water content. The HM-WS1 uses the coulometric method, providing high sensitivity for trace-level moisture measurement.

Q2: What types of samples can the HM-WS1 measure?

The HM-WS1 can directly measure liquid samples that are compatible with Karl Fischer reagent, including petroleum products, solvents, and oils. For solid samples or substances that do not dissolve in the reagent, the instrument can be used with a solid or liquid sample injector for indirect measurement — the sample is heated in an evaporator and the released water is carried by dry gas into the titration cell. This extends the applicability to powders, pellets, and other non-liquid materials.

Q3: How long does a typical moisture determination take with the HM-WS1?

A typical determination on the HM-WS1 completes in approximately 60 seconds under normal operating conditions. The instrument automatically controls the stirring speed and electrolysis current, and the determination concludes automatically when the endpoint is reached. Sample preparation time varies depending on the sample type but is generally minimal for liquid injection.

Q4: What safety features does the sealed titration cell provide?

Karl Fischer reagent contains iodine, sulfur dioxide, and organic solvents that can be harmful if inhaled or contacted. The HM-WS1's sealed titration cell bottle encloses the reagent and reaction mixture, preventing vapor escape and direct operator contact during the titration process. This design reduces exposure risk compared to open-cell titration setups, making the instrument safer for routine use in standard laboratory environments.

Q5: What standards does the HM-WS1 comply with?

The HM-WS1 complies with 23 national and industry standards across the GB/T and SH/T series, covering moisture determination methods for petroleum products, chemical materials, and pharmaceutical substances. These standards validate the instrument's measurement principle and accuracy for regulated testing applications in industries where compliance with established test methods is mandatory.

Q6: Is the HM-WS1 suitable for a laboratory with limited budget?

Yes. The HM-WS1 is specifically positioned as an economical entry-level instrument that delivers the Karl Fischer coulometric method without the additional cost of touchscreen displays, data storage, or automated printing features found in higher-priced models. For laboratories that need reliable trace moisture data and can manage with manual recording of displayed results, the HM-WS1 provides the essential measurement capability at a significantly lower investment.