YiHeng DHP Series Natural Convection Incubator

Overview

The YiHeng DHP Series Natural Convection Incubator is a precision-engineered, benchtop or floor-standing environmental chamber designed for reliable, low-disturbance temperature maintenance in cell culture, microbiological growth, and general biological storage applications. Unlike forced-air incubators, this model utilizes natural convection—relying on buoyancy-driven thermal gradients—to circulate air passively within the chamber. This design eliminates fan-induced vibration, airflow shear stress, and acoustic noise, making it especially suitable for sensitive adherent cell lines, non-agitated suspension cultures, spore germination studies, and long-term stability testing where mechanical perturbation must be minimized. The chamber operates within a stable range of ambient +5°C to 65°C, with typical temperature uniformity ≤ ±0.8°C at 37°C (measured per ISO 15265:2021 Annex B methodology) and stability ≤ ±0.3°C over 24 hours under steady-state conditions.

Key Features

• Mirror-finish AISI 304 stainless steel interior—non-porous, corrosion-resistant, and compatible with standard laboratory disinfectants (e.g., 70% ethanol, hydrogen peroxide vapor); facilitates rapid cleaning and reduces microbial adhesion.
• Fuzzy logic PID temperature controller with real-time deviation compensation—delivers high reproducibility across operating ranges and mitigates overshoot during setpoint transitions.
• Integrated digital timer with programmable duration up to 99 hours and 59 minutes; supports timed shutdown and alarm activation independent of main control loop.
• Dual-level thermal safety architecture: primary control loop with deviation alarm (±2°C threshold), plus an independent mechanical/thermal cut-off switch that interrupts heating power if chamber temperature exceeds user-defined limit by >3°C.
• Double-layer insulated observation window (tempered glass with low-emissivity coating) enables continuous visual monitoring without compromising thermal integrity or introducing condensation.

Sample Compatibility & Compliance

The DHP series accommodates standard tissue culture flasks (T25–T225), Petri dishes (up to 150 mm), multi-well plates, and glassware stacks without airflow obstruction. Its static internal environment preserves volatile media components (e.g., CO₂-buffered bicarbonate systems remain stable when used in conjunction with external CO₂ regulation), minimizes evaporation from open vessels, and avoids desiccation artifacts common in fan-assisted units. The incubator complies with IEC 61010-1:2010 for electrical safety and meets essential requirements of the EU Machinery Directive 2006/42/EC. When equipped with the optional UV-C lamp (254 nm, 15 W), it supports periodic decontamination cycles aligned with CLSI M22-A3 and ISO 14644-1 Class 5 cleanroom maintenance protocols.

Software & Data Management

The base configuration includes local analog/digital interface only—no embedded data logging or network connectivity. However, the optional multi-stage programmable controller provides full profile-based operation: users may define up to 30 segments combining target temperature, dwell time, and ramp rate (°C/min). All parameters—including setpoints, actual chamber temperature, elapsed time, and alarm status—are displayed simultaneously on a backlit LCD screen with intuitive menu navigation. While the system does not natively support FDA 21 CFR Part 11-compliant electronic records, third-party USB data loggers (e.g., Omega OM-DAQPRO-5300) can be integrated via RS-485 port (Modbus RTU protocol) for GLP-aligned audit trails and CSV export.

Applications

• Long-term maintenance of primary mammalian cells and stem cell lines requiring minimal mechanical stress.
• Bacterial and fungal cultivation under non-aerated conditions (e.g., Clostridium, Helicobacter pylori microaerophilic adaptation).
• Enzyme activity assays and protein stability studies where convective cooling or drying must be avoided.
• Seed germination, plant tissue culture, and entomological rearing protocols demanding stable thermal gradients.
• QC/QA holding chambers for pharmaceutical raw materials and excipients per USP and EP 2.6.13 guidelines.

FAQ

Does the DHP series support CO₂ concentration control?
No—this is a temperature-only incubator. For CO₂-dependent cultures, users must integrate an external CO₂ supply with passive diffusion or pair the unit with a separate CO₂-regulated chamber.
Is calibration certificate included with shipment?
A factory calibration report (traceable to NIM, China) is provided; UKAS or NIST-traceable certification is available upon request at additional cost.
Can the UV-C lamp be operated while samples are inside?
No—UV irradiation is strictly prohibited during active incubation. The lamp is interlocked with the door switch and only activates when the chamber is unoccupied and sealed.
What is the maximum allowable ambient temperature for continuous operation?
The unit is rated for ambient environments up to 30°C and relative humidity ≤ 80% non-condensing, per IEC 60068-2-1 and IEC 60068-2-2 test conditions.
Are shelf load specifications published?
Yes—maximum uniformly distributed static load per shelf is 15 kg; total chamber loading must not exceed 80% of internal volume to maintain thermal uniformity.