BenAng MA-1A Automatic Volumetric Karl Fischer Moisture Titrator
| Brand | BenAng |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Instrument Type | Volumetric Karl Fischer Titrator |
| Moisture Range | 30 ppm – 100% (w/w H₂O) |
| Accuracy | ≤ ±0.002 mL |
| Minimum Dispensing Volume | 0.01 mL |
| Resolution | 0.01 mL |
| Repeatability | ≤ 0.01 mL |
| Linearity Correlation Coefficient | ≥ 0.998 |
| Burette Capacity | >25 mL |
| Detection Current Sensitivity | 10⁻⁶ A |
Overview
The BenAng MA-1A Automatic Volumetric Karl Fischer Moisture Titrator is a precision-engineered analytical instrument designed for quantitative determination of water content in solid, liquid, and gaseous samples using the volumetric Karl Fischer (KF) titration principle. Based on the stoichiometric reaction between iodine, sulfur dioxide, water, and a base in anhydrous methanol or alternative KF solvent systems, the MA-1A delivers high reproducibility and trace-level detection capability across diverse industrial matrices. It operates under the electrochemical endpoint detection principle—monitoring polarization current across a dual-platinum electrode pair—to identify the precise moment when excess iodine appears in solution, thereby terminating titration automatically. The system complies with key international standard methodologies including ASTM D6304, ISO 760, and USP , and supports full alignment with GB/T 6283, GB/T 11146, GB/T 11133, and over 20 additional Chinese national standards for moisture analysis.
Key Features
- Electrode polarization voltage-controlled titration rate adjustment, enabling accelerated titration cycles—typical analysis time per sample is under 60 seconds.
- Dedicated analog current meter integrated into the front panel for real-time visualization of titration progress and endpoint approach.
- Chemically inert fluidic pathway constructed entirely from PTFE, FEP, and borosilicate glass components, ensuring long-term resistance to aggressive KF reagents (including pyridine-based and pyridine-free formulations).
- Hermetically sealed titration cell and reagent delivery system, minimizing ambient moisture ingress and eliminating systematic bias from atmospheric humidity.
- Standardized solvent bottle cap interface compatible with commercially available KF reagent containers—no proprietary adapters required for routine reagent replacement.
- High-brightness 7-segment LED display with intuitive function-key navigation for solvent aspiration, titration initiation, endpoint confirmation (audible/visual alert), waste ejection, and magnetic stirring control.
- Fault-tolerant operation logic: any user-initiated interruption triggers immediate process halt and safe system reset without data loss or reagent contamination.
Sample Compatibility & Compliance
The MA-1A accommodates a broad spectrum of sample types—including pharmaceutical actives and excipients, organic and inorganic chemical intermediates, petrochemical feedstocks, agrochemical formulations, food-grade oils and emulsions, cosmetic bases, and surfactant concentrates. Its closed-system architecture meets occupational health and safety requirements for handling volatile or toxic KF solvents, preventing vapor release during operation. The instrument supports GLP-compliant workflows through manual audit trail documentation; while it does not include built-in 21 CFR Part 11 electronic signature functionality, its deterministic endpoint detection and repeatable dispensing mechanics ensure data integrity suitable for internal QC/QA validation protocols aligned with ISO/IEC 17025 and ICH Q2(R2) guidelines.
Software & Data Management
The MA-1A operates via embedded firmware with no external PC dependency. All operational parameters—including titrant concentration, sample weight, blank correction, and endpoint threshold—are configured directly via membrane keypad inputs. Measurement results (water content in % w/w or ppm, titrant volume consumed, and relative standard deviation across replicates) are displayed and retained in non-volatile memory for up to 100 test records. Data export is performed manually via visual readout or optional RS-232 serial interface (with compatible terminal software). For laboratories requiring automated reporting, integration with LIMS platforms is achievable using ASCII-based command-response protocols and standardized delimiter formats.
Applications
This titrator serves critical quality control functions across regulated and non-regulated sectors: quantification of residual moisture in lyophilized biopharmaceuticals per USP ; verification of drying efficiency in catalyst synthesis; specification testing of hygroscopic raw materials in fine chemical manufacturing; batch release testing of transformer oils per ASTM D1533; moisture profiling in edible fats and dairy powders; and stability-indicating assays for hydrolytically labile APIs. Its robust design and consistent volumetric delivery make it especially suited for routine high-throughput environments where operator-to-operator variability must be minimized.
FAQ
What type of Karl Fischer method does the MA-1A implement?
It uses volumetric titration with bipotentiometric endpoint detection.
Is the instrument compatible with pyridine-free reagents?
Yes—its chemically resistant fluid path and universal solvent bottle interface support both traditional pyridine-based and modern imidazole-based KF reagents.
Does the MA-1A support automatic blank correction?
Yes—users can perform and store a solvent blank measurement, which is subtracted automatically from subsequent sample results.
Can the titration burette be calibrated in-house?
Yes—the >25 mL glass burette includes graduation marks and is compatible with standard gravimetric calibration procedures per ISO 8655-3.
What maintenance intervals are recommended for optimal performance?
Daily rinsing of electrodes and tubing with dry solvent; monthly inspection of septa and O-rings; annual verification of burette delivery accuracy using certified reference water standards.
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