HengaoDe WSP-SGH Dual-Plate Infrared Sand Dryer
| Brand | HengaoDe |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | WSP-SGH |
| Price | USD 75 (FOB) |
| Infrared Lamp Power | 250 W / 220 V AC |
| Sample Tray Surface Temperature | 110–170 °C |
| Tray Dimensions (Diameter × Depth) | 110 × 27 mm |
| Drying Time Range | 6–10 min |
| Timer Range | 0–15 min |
| Overall Dimensions (L×W×H) | 473 × 223 × 280 mm |
| Net Weight | 9.6 kg |
Overview
The HengaoDe WSP-SGH Dual-Plate Infrared Sand Dryer is a laboratory-grade thermal drying instrument engineered for rapid, reproducible moisture loss determination in foundry sand samples—including green sand, molding sand, and core sand—per standardized gravimetric procedures. It operates on the principle of near-infrared (NIR) radiative heating: two high-intensity 250 W infrared lamps emit electromagnetic energy predominantly in the 0.75–3.0 µm wavelength range, which is efficiently absorbed by water molecules in the sand matrix. This direct volumetric heating mechanism minimizes thermal lag and eliminates convective heat transfer inefficiencies associated with conventional ovens, enabling uniform surface-to-core desiccation within 6–10 minutes. The device is not a moisture analyzer per se but a dedicated sample preparation tool that delivers consistent, operator-independent drying conditions prior to analytical weighing—ensuring compliance with ASTM C109/C109M (compressive strength testing), ISO 14688-1 (geotechnical classification), and foundry-specific internal QC protocols requiring precise moisture content reporting.
Key Features
- Dual independent infrared heating zones with adjustable timer control (0–15 min in 1-min increments), allowing parallel processing of two sand specimens under identical thermal profiles.
- Stainless steel sample trays (110 mm diameter × 27 mm depth) engineered for thermal stability and resistance to abrasive wear during repeated loading/unloading.
- Integrated LED indicator and mechanical push-button switch provide clear operational feedback and tactile confirmation of activation.
- Robust sheet-metal housing with insulated rear panel and ventilation grilles ensures safe surface temperatures (<50 °C ambient enclosure temperature) during continuous operation.
- No moving parts or airflow systems—eliminates dust contamination risk and reduces maintenance requirements typical of forced-air dryers.
Sample Compatibility & Compliance
The WSP-SGH is validated for use with granular mineral aggregates ranging from 0.075 mm (No. 200 sieve) to 2.36 mm (No. 8 sieve), including silica-based molding sands, bentonite-bonded greensands, and phenolic urethane core sands. Its fixed tray geometry and controlled radiant flux ensure uniform energy density (≈1.8 W/cm² at tray surface) across the entire sample bed—critical for minimizing edge effects and achieving <±0.2% RSD in replicate moisture determinations. While not certified to IEC 61000-4 EMC standards, the unit meets GB 4793.1–2007 (Chinese safety standard for electrical equipment for measurement, control, and laboratory use) and carries CCC marking for domestic sale. It supports GLP-compliant workflows when paired with calibrated analytical balances (e.g., Mettler Toledo XP series) and documented drying SOPs referencing ISO/IEC 17025 clause 7.2.2 (method validation).
Software & Data Management
The WSP-SGH is a standalone hardware-only instrument with no embedded microprocessor, firmware, or digital interface. All operational parameters—including timer setting, lamp activation, and status indication—are managed via electromechanical controls. Consequently, it generates no electronic records, requires no software installation, and imposes zero cybersecurity or data integrity obligations under FDA 21 CFR Part 11 or EU Annex 11. This architecture ensures deterministic behavior, eliminates firmware update dependencies, and simplifies audit trails: each drying event is traceable solely through lab notebook entries (operator ID, sample ID, start/stop time, tray ID, post-dry mass) and physical timer dial position photographs—fully compatible with paper-based or hybrid LIMS environments.
Applications
- Routine moisture content verification in foundry QC labs prior to mold compaction and casting cycle initiation.
- Preparation of reference sand specimens for ASTM C1437 (flow table test) and ISO 679 (cement mortar testing) where water-to-cement ratio precision is critical.
- Accelerated drying of soil samples in geotechnical engineering labs adhering to ASTM D2216 (moisture content by oven-drying method), though not a substitute for 105 °C convection ovens in regulatory submissions.
- Educational demonstrations of radiative heat transfer kinetics and phase-change thermodynamics in materials science laboratories.
FAQ
Is the WSP-SGH suitable for organic-bonded sands or resin-coated sands?
Yes—its radiant heating mechanism avoids thermal degradation risks associated with hot-air circulation; however, users must verify maximum exposure time to prevent premature binder decomposition (typically <8 min for furan resins).
Can the tray temperature be externally monitored during operation?
No—the unit lacks integrated temperature sensors or output ports; surface temperature verification requires contactless IR thermometry (e.g., Fluke TiS20+) calibrated per ASTM E1933.
Does the dryer meet NIST-traceable calibration requirements?
It does not require calibration as a non-measuring device; however, periodic verification of timer accuracy (±1 sec over 15 min) and lamp voltage (220 V ±5%) using NIST-traceable multimeters is recommended per ISO/IEC 17025 clause 6.4.6.
What is the expected service life of the infrared lamps?
Rated for ≥5,000 hours at nominal voltage; replacement lamps (G250/220V, E27 base) are globally available and interchangeable without tools.
Is the unit compatible with Class II biological safety cabinets?
No—it must be operated in open benchtop environments due to mandatory ventilation clearance (≥150 mm rear/side spacing) and absence of exhaust ducting provisions.
