Yoke DSH-10A Halogen Moisture Analyzer

Overview

The Yoke DSH-10A Halogen Moisture Analyzer is a precision laboratory instrument engineered for rapid, gravimetric determination of moisture content in solid and semi-solid materials. It operates on the loss-on-drying (LOD) principle: a pre-weighed sample is heated under controlled halogen lamp irradiation, driving off volatile components—primarily water—while an integrated high-resolution weighing sensor continuously monitors mass loss in real time. The instrument calculates moisture content (%) as the ratio of mass lost during drying to the initial sample mass. Designed for routine quality control and R&D applications in pharmaceutical, food, chemical, and polymer laboratories, the DSH-10A delivers reproducible results with minimal operator intervention and no consumables beyond standard desiccant-free operation.

Key Features

• Halogen heating system with rapid thermal response—achieves target temperature within seconds and maintains stable thermal profiles across the 50–180 °C range.
• High-precision electromagnetic force compensation sensor with 10 mg readability and ±0.5% repeatability (tested on 3 g reference samples), ensuring consistent gravimetric accuracy.
• Backlit dot-matrix LCD display optimized for low-ambient lighting conditions; supports simultaneous readout of moisture %, dry residue %, current weight, elapsed time, and calendar date.
• Ergonomic membrane keypad interface enabling intuitive navigation through setup menus, method selection, and data review without tactile ambiguity.
• Thermally isolated weighing chamber with aluminum alloy pan (100 mm diameter) to minimize convection-induced drift and enhance measurement stability during extended heating cycles.
• Configurable endpoint detection: users may select either fixed-duration drying (1–99 minutes, adjustable in 1-minute steps) or automatic termination based on mass change rate thresholds.

Sample Compatibility & Compliance

The DSH-10A accommodates a broad spectrum of non-volatile and thermally stable matrices including powders (e.g., APIs, excipients, flour, starch), granules, pellets, pastes, and thin-film coatings. Samples must be homogeneous and representative; particle size should permit uniform heat penetration. Volatile solvents, highly hygroscopic substances, or thermally labile compounds (e.g., certain vitamins, enzymes) require method validation prior to routine use. While not certified to ISO 17025 or ASTM E1447 by default, the instrument supports GLP-compliant workflows when paired with validated SOPs and external calibration records. Its RS232 port enables integration into LIMS environments where audit trails and electronic signatures are managed externally per FDA 21 CFR Part 11 requirements.

Software & Data Management

Data output is transmitted via RS232 serial interface to external PCs or printers. No proprietary software is bundled; however, the device outputs ASCII-formatted strings containing timestamp, sample ID (user-entered), initial mass, final mass, moisture %, solid %, and duration—enabling direct import into Excel, LabArchives, or custom QA databases. All displayed parameters—including date/time—are retained in non-volatile memory during power cycling. Firmware does not support user-defined drying ramps or multi-stage protocols; method flexibility is limited to preset temperature and timer configurations. For regulated environments, laboratories must establish documented procedures for periodic verification (e.g., daily zero and span checks using certified weights and reference standards).

Applications

• Pharmaceutical manufacturing: moisture verification of active pharmaceutical ingredients (APIs), excipients, and finished dosage forms per USP <731> guidelines.
• Food processing: QC testing of cereal grains, dairy powders, coffee beans, and dehydrated vegetables to ensure shelf-life stability and compliance with Codex Alimentarius moisture limits.
• Polymer & plastics industry: monitoring residual monomer or solvent content in resins and masterbatches prior to extrusion or molding.
• Chemical synthesis labs: quantifying hydrate water in inorganic salts or assessing drying efficiency of catalyst supports.
• Agricultural research: rapid field-lab screening of grain moisture for harvest readiness assessment and storage risk modeling.

FAQ

What calibration standards are recommended for routine verification?
Certified reference materials with known moisture content (e.g., sodium tartrate dihydrate, ~15.66% H₂O at 25 °C) or NIST-traceable dried silica gel are advised for performance checks. Daily zero calibration using the internal tare function is mandatory.
Can the DSH-10A be used for volatile organic compound (VOC) analysis?
No. The instrument measures total volatile loss—not water-specific loss—and cannot distinguish between water and other volatiles. Karl Fischer titration remains the gold standard for selective water quantification.
Is the halogen lamp replaceable by the end user?
Yes. The lamp is a standardized MR16 halogen type with integrated reflector; replacement requires basic mechanical disassembly and adherence to electrical safety precautions outlined in the service manual.
Does the device meet IP rating or environmental protection specifications?
The DSH-10A has no formal IP rating. It is intended for indoor laboratory use only, with operating ambient conditions specified as 10–30 °C and ≤80% RH non-condensing.
How frequently should the weighing sensor be recalibrated?
Annual recalibration by an accredited metrology laboratory is recommended. Internal adjustment is not supported; sensor linearity verification must be performed using traceable test weights across the full 0–10 g range.