Yoyi DHG-9035C Benchtop Nitrogen-Purged Forced-Air Drying Oven

Overview

The Yoyi DHG-9035C is a benchtop forced-air drying oven engineered for precision thermal processing under controlled inert atmospheres. Designed around a dual-function architecture—simultaneously serving as a high-stability drying oven and a nitrogen-purged thermal environment chamber—it enables reproducible heat treatment of oxygen-sensitive, thermally labile, or oxidation-prone samples. Its operational principle relies on forced convection via an optimized rear-mounted air circulation system, combined with programmable inert gas (N₂) purging to displace ambient air and suppress oxidative degradation. This configuration supports applications requiring both precise temperature control (±1℃ fluctuation) and atmospheric integrity—particularly critical in pharmaceutical stability testing, polymer curing, electronic component baking, and analytical sample preparation where residual moisture or oxidation must be minimized.

Key Features

• Microprocessor-based PID temperature control with 0.1℃ resolution and real-time display of setpoint, actual chamber temperature, and remaining timer duration on a 4.3-inch backlit LCD interface;
• Dual-layer tempered glass observation window with large viewing area, enabling continuous visual monitoring without compromising thermal integrity;
• High-efficiency rear air duct system with adjustable airflow path, ensuring uniform heat distribution (±2.5% at 100℃ in standard mode) and rapid recovery after door opening;
• Integrated nitrogen inlet port (Φ10 mm) fitted with a calibrated rotameter (0–10 L/min range), allowing precise regulation and repeatable inert gas flow during purging cycles;
• Mirror-finish 304 stainless steel interior chamber and removable adjustable stainless steel shelves for corrosion resistance, easy cleaning, and compatibility with GMP/GLP workflows;
• Robust cold-rolled steel outer casing with electrostatic epoxy powder coating; high-temperature silicone door gasket ensures long-term sealing performance up to 300℃;
• Power-fail memory function retains all user-defined parameters—including temperature setpoint, timer value, and alarm thresholds—enabling automatic resumption upon power restoration;
• Over-temperature protection circuit with independent mechanical safety limiter (adjustable up to 320℃) compliant with IEC 61000-4-2/4-4 immunity standards.

Sample Compatibility & Compliance

The DHG-9035C accommodates a broad spectrum of sample types including but not limited to: lyophilized biologics, ceramic precursors, semiconductor wafers, catalyst substrates, pharmaceutical excipients, and moisture-sensitive reagents. Its 30 L internal volume (340 × 330 × 320 mm) and two-tier shelf configuration support standardized USP and ISO 17025-compliant drying protocols. The nitrogen purging capability aligns with ASTM E145–22 requirements for inert-atmosphere thermal conditioning and supports validation activities under FDA 21 CFR Part 11 when paired with optional RS485 data logging and audit-trail-enabled software. All electrical components meet CE marking directives (2014/30/EU EMC, 2014/35/EU LVD), and thermal insulation complies with EN 60519-2 for industrial heating equipment safety.

Software & Data Management

While the base unit operates via standalone microcontroller logic, optional digital enhancements extend its traceability and integration capacity. The RS485 communication interface (add-on, $600) enables bidirectional connection to laboratory information management systems (LIMS) or SCADA platforms using Modbus RTU protocol. An optional embedded thermal printer ($1,500) provides hard-copy records of temperature profiles and event logs—critical for ISO 17025 accreditation audits. For advanced process control, the multi-segment programmable controller ($1,500) supports up to 30 ramp-hold cycles with slope-defined heating/cooling rates, facilitating complex thermal profiles required in material annealing or accelerated aging studies. All optional modules retain full compatibility with GLP documentation requirements, including electronic signatures and user-access-level permissions.

Applications

• Pharmaceutical: Residual solvent removal from active pharmaceutical ingredients (APIs) under inert conditions to prevent degradation;
• Electronics: Pre-baking of PCB assemblies and conformal coatings prior to encapsulation to eliminate trapped moisture;
• Materials Science: Thermal stabilization of metal-organic frameworks (MOFs), perovskites, and battery electrode materials;
• Food & Agriculture: Moisture content determination per AOAC 950.46 and ISO 6655-1 without Maillard reaction interference;
• Quality Control Labs: Standardized drying of filter papers, crucibles, and volumetric glassware per ASTM D2240 and ISO 4611;
• Research: Controlled pyrolysis of organic precursors, low-temperature ashing of biological tissues, and desiccation of nanomaterial dispersions.

FAQ

What is the maximum operating temperature of the DHG-9035C?
The unit is rated for continuous operation up to 300℃, with over-temperature cut-off protection set at 320℃.
Can this oven be validated for GMP use?
Yes—when equipped with the optional RS485 interface and compliant software, it supports IQ/OQ/PQ documentation, electronic audit trails, and 21 CFR Part 11 compliance.
Is nitrogen flow rate adjustable during operation?
Yes—the integrated float-type flowmeter allows real-time manual adjustment across 0–10 L/min with ±5% full-scale accuracy.
How many shelves are included, and are they adjustable?
Two stainless steel shelves are supplied; both are height-adjustable via pre-drilled support slots in the chamber sidewalls.
Does the oven support ramp-and-soak programming out of the box?
No—ramp-and-soak functionality requires the optional multi-segment programmable controller add-on.
What safety certifications does the DHG-9035C hold?
It conforms to CE directives for electromagnetic compatibility (EMC) and low-voltage safety (LVD), and its thermal design follows EN 60519-2 for industrial electric heating equipment.