Automatic Karl Fischer Coulometric Titrator for Laboratory Moisture Analysis and Quality Control HM-WS2

Product Introduction

Moisture content directly impacts product quality, process efficiency, and regulatory compliance across a wide range of industries. In pharmaceutical manufacturing, residual moisture in drug substances must be controlled within narrow limits to ensure stability; in petroleum refining, water content in fuels and lubricants affects combustion performance and corrosion rates; in food production, moisture levels influence texture, shelf life, and safety. Karl Fischer coulometric titration remains the most widely accepted reference method for accurate water determination, but the operational efficiency of the instrument significantly affects laboratory throughput and data management.

Many laboratories still rely on semi-automatic or manual Karl Fischer instruments that require operators to transcribe results by hand, perform calculations separately, and maintain paper-based records — introducing opportunities for transcription errors and reducing traceability. As testing volumes increase and regulatory documentation requirements become more stringent, the need for automated moisture determination with integrated data management becomes essential.

The HM-WS2 is a fully automatic Karl Fischer coulometric titrator designed to address these laboratory efficiency and documentation needs. Equipped with a 7.0-inch 800×480 pixel true-color TFT-LCD touchscreen and capacitive human-sensing keyboard, the instrument provides an intuitive all-Chinese operating interface that minimizes operator training time. The core processor — a TI AM3354 (ARM Cortex-A8, 1 GHz) — runs the Windows Embedded Compact 7 real-time industrial control system, delivering stable and responsive instrument control for demanding laboratory environments.

The HM-WS2 achieves a sensitivity threshold of 0.01 μg H₂O, an order of magnitude more sensitive than basic LED-display models, with defined accuracy specifications: errors below 2 μg for water content under 10 μg, within 2 μg for 10–1000 μg, and within 0.2% for content above 1000 μg. Determination completes in approximately 60 seconds with automatic endpoint detection. The instrument automatically calculates and prints percentage content along with sample number, operator name, and test date, and stores results for retrieval and review — eliminating manual transcription and calculation errors.

The sealed titration cell ensures operator safety, and the compact 385 × 290 × 280 mm form factor fits comfortably on standard laboratory benches. Compliant with 23 national and industry standards (GB/T and SH/T series), the HM-WS2 serves petroleum, chemical, pharmaceutical, food, and electric power industries with both measurement capability and documentation efficiency.

Applications

• Petroleum and petrochemical industry: moisture determination in crude oil, refined fuels, lubricants, and insulation oils per GB/T and SH/T standards

• Pharmaceutical manufacturing: residual moisture testing in active pharmaceutical ingredients, excipients, and finished products for GMP compliance

• Food industry: water content analysis in raw materials, intermediates, and finished food products

• Chemical manufacturing: trace water determination in solvents, reagents, and intermediate products

• Electric power sector: insulation oil moisture analysis for transformer and switchgear maintenance programs

• Quality control laboratories: standardized moisture determination for regulatory testing and certification

Key Features & Advantages

1. Fully automatic Karl Fischer coulometric titration with one-touch operation and automatic endpoint detection

2. 7.0-inch 800×480 true-color TFT-LCD touchscreen with capacitive human-sensing keyboard for intuitive operation

3. All-Chinese operating interface reducing operator training requirements

4. TI AM3354 processor (ARM Cortex-A8, 1 GHz) running Windows Embedded Compact 7 real-time industrial control system for stable performance

5. Sensitivity threshold of 0.01 μg H₂O — ten times more sensitive than basic LED-display models

6. Defined accuracy specifications: <2 μg below 10 μg water, ≤2 μg for 10–1000 μg, ≤0.2% above 1000 μg

7. Automatic calculation and printing of percentage content, sample number, operator, and test date

8. Result storage function for retrieval and review of historical measurements without manual record-keeping

9. Determination completing in approximately 60 seconds with automatic endpoint recognition

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

11. Wide measurement range from 0.0001% (1 ppm) to 100% moisture content

12. Power consumption below 60W with AC 220V ±10%, 50Hz ±5% power supply

13. Operating temperature range 5–40°C with humidity tolerance below 85%

14. Compact dimensions of 385 × 290 × 280 mm with approximately 8 kg weight for benchtop placement

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

Technical Specifications

FAQ

Q1: What are the accuracy specifications of the HM-WS2?

The HM-WS2 provides defined accuracy across the full measurement range: for water content below 10 μg, the error is less than 2 μg; for water content between 10 and 1000 μg, the error is within 2 μg; and for water content above 1000 μg, the error is within 0.2%. These specifications are validated against the instrument's 0.01 μg H₂O sensitivity threshold and ensure reliable results from trace-level to high moisture content measurements.

Q2: How does the HM-WS2's touchscreen interface improve laboratory workflow?

The 7.0-inch true-color TFT-LCD touchscreen with capacitive human-sensing keyboard provides an all-Chinese operating interface that allows operators to set parameters, initiate determinations, and review stored results through intuitive touch interactions rather than navigating physical buttons or rotary knobs. This reduces the learning curve for new operators and minimizes the risk of input errors compared to traditional keypad-based instruments.

Q3: Can the HM-WS2 store and print measurement results?

Yes. The HM-WS2 automatically stores measurement results in its internal memory for retrieval and review. After each determination, the instrument automatically calculates percentage content and prints a report including the sample number, operator name, test date, and measured moisture content. This eliminates the need for manual transcription and calculation, reducing errors and improving data traceability for quality management and regulatory compliance.

Q4: What operating system does the HM-WS2 use, and why does it matter?

The HM-WS2 runs Windows Embedded Compact 7 (also known as Windows CE 7), a real-time industrial control operating system, on a TI AM3354 processor with an ARM Cortex-A8 core at 1 GHz. Unlike general-purpose desktop operating systems, Windows Embedded Compact 7 is designed for deterministic response in embedded and industrial applications, providing stable instrument control without the interruptions, crashes, or update reboots associated with consumer OS environments.

Q5: What is the advantage of the HM-WS2's 0.01 μg sensitivity over basic LED-display models?

The 0.01 μg H₂O sensitivity threshold means the HM-WS2 can detect water content an order of magnitude lower than instruments with 0.1 μg sensitivity. This is significant for applications requiring very low moisture verification, such as high-purity solvents, dry pharmaceutical excipients, or ultra-dry insulation oils where water content must be confirmed at sub-ppm levels. The higher sensitivity also improves measurement confidence at the lower end of the detection range.

Q6: How does the sealed titration cell contribute to laboratory safety?

Karl Fischer reagent contains iodine, sulfur dioxide, and organic solvents such as methanol or ethanol, which pose health hazards through inhalation and skin contact. The HM-WS2's sealed titration cell bottle encloses the reagent and reaction mixture throughout the determination process, preventing vapor release and eliminating the risk of direct operator contact. This enclosed design makes the instrument suitable for routine use in standard laboratory environments without requiring special ventilation.

Q7: What industries and standards does the HM-WS2 support?

The HM-WS2 complies with 23 national and industry standards across the GB/T and SH/T series, covering moisture determination methods for petroleum products, chemical substances, and pharmaceutical materials. It is applicable in petroleum refining, chemical manufacturing, pharmaceutical production, food processing, and electric power industries where regulated moisture testing is required. The automatic result documentation capability supports GMP and quality management system requirements for data