WIGGENS WF-22G Forced Convection Drying Oven

Overview

The WIGGENS WF-22G Forced Convection Drying Oven is an engineered solution for laboratories requiring precise, repeatable thermal processing across a broad operational range—from ambient +10 °C up to 250 °C. Designed in accordance with ISO 17025-aligned thermal validation practices, the WF-22G employs a robust forced-air circulation system based on multi-blade, low-noise centrifugal fans. This architecture ensures laminar, uniform airflow throughout the chamber—critical for applications demanding high spatial temperature homogeneity (±0.8 °C at 100 °C), such as residual solvent removal, gravimetric moisture analysis, pre-conditioning of polymer samples, and dry-heat sterilization of glassware and metal instruments. Its thermally insulated double-wall construction, combined with high-efficiency NiCrFe alloy-sheathed heating elements, minimizes thermal lag and supports stable setpoint maintenance under variable load conditions.

Key Features

• PID-based microprocessor controller with intuitive LED touchscreen interface and 0.1 °C display resolution for real-time monitoring and fine-grained setpoint adjustment
• Programmable timer function (1 minute to 99 hours 59 minutes) enabling unattended operation and process reproducibility
• Three user-configurable temperature presets for rapid recall of frequently used setpoints—reducing operator error and setup time
• Independent mechanical overtemperature safety cut-off (dual-limit thermostat) compliant with IEC 61000-6-2 and EN 61010-1 safety standards
• Door-open alarm with automatic power reduction and audible alert—ensuring process integrity and personnel awareness
• Two adjustable 35-mm-diameter ventilation ports with sliding covers for controlled vapor evacuation during drying or curing cycles
• Chamber interior features seamless, arc-cornered stainless steel construction for ease of cleaning and resistance to chemical exposure and thermal cycling fatigue
• Ergonomic recessed door handle and reinforced tempered glass observation window (optional, order code W6061151) for non-intrusive sample monitoring without thermal disturbance

Sample Compatibility & Compliance

The WF-22G accommodates a wide variety of sample formats—including Petri dishes, weighing boats, crucibles, glassware batches, and small-scale industrial components—within its 150 L chamber. Its internal geometry (500 × 480 × 625 mm) allows for flexible shelf configuration (up to 14 positions), supporting both high-throughput routine drying and low-volume critical applications. The oven meets key regulatory expectations for laboratory thermal equipment: it supports GLP-compliant documentation through RS232 serial output (compatible with LabVIEW, Excel-based logging, or LIMS integration), and its thermal performance aligns with ASTM E145 Class II specifications for gravity and forced-convection ovens. While not certified for medical device sterilization per ISO 17665, it is routinely employed for depyrogenation validation studies and pre-sterilization drying steps in pharmaceutical QC environments.

Software & Data Management

Equipped with a standard RS232 communication port, the WF-22G enables bidirectional data exchange with external PCs or centralized lab control systems. Users can log temperature profiles, event timestamps (e.g., door openings, timer completion, alarm triggers), and setpoint history—facilitating audit-ready traceability required under FDA 21 CFR Part 11 when paired with validated third-party software. No proprietary drivers are required; ASCII protocol support allows integration into existing automation frameworks without middleware dependency. Firmware updates are performed via serial command sequence, ensuring long-term maintainability and cybersecurity resilience in regulated settings.

Applications

• Moisture content determination per AOAC 950.46 and USP <731> Loss on Drying protocols
• Drying and conditioning of reference standards, filter papers, and desiccants prior to gravimetric analysis
• Thermal aging studies of elastomers, adhesives, and packaging materials per ISO 188 and ASTM D573
• Pre-baking of PCB substrates and ceramic components in electronics R&D
• Residual solvent evaporation from HPLC vials and GC sample preparation workflows
• Heat treatment of calibration weights and metrology artifacts in accredited calibration labs

FAQ

What is the maximum recommended operating temperature for continuous use?
The WF-22G is rated for continuous operation up to 250 °C. For extended stability at upper-range temperatures (>220 °C), ensure adequate ventilation around the unit and avoid overloading the chamber.
Can the oven be validated for IQ/OQ/PQ protocols?
Yes—the unit’s thermal uniformity, repeatability, and controller linearity meet baseline requirements for installation and operational qualification. A 9-point mapping procedure using NIST-traceable sensors is recommended for PQ.
Is the RS232 interface compatible with modern Windows or macOS systems?
Yes, via standard USB-to-serial adapters (FTDI chipset recommended). ASCII command syntax and response format are documented in the technical manual.
Are additional shelves available as accessories?
Stainless steel shelves (part no. W6061152) and reinforced wire mesh trays (W6061153) are available separately, rated for full-load operation at 250 °C.
Does the oven support ramp-soak programming?
No—the WF-22G implements single-setpoint PID control with timer-based cycling only. For multi-stage thermal profiles, external programmable logic controllers or integrated environmental chambers are recommended.