YiHeng DHP Series Electrically Heated Constant-Temperature Incubator

Overview

The YiHeng DHP Series Electrically Heated Constant-Temperature Incubator is a benchtop-to-floor-standing dry incubation platform engineered for precise, stable, and reproducible temperature control in cell culture, microbiological growth, enzyme activity assays, and general biological storage applications. Unlike humidified or CO₂-incorporated incubators, the DHP series operates as a convection-heated dry incubator—relying on resistive heating elements and forced-air circulation to maintain thermal homogeneity across the chamber volume. Its design adheres to fundamental principles of thermal dynamics in enclosed biorelevant environments: uniform convective heat transfer minimizes thermal stratification, while fuzzy PID logic continuously modulates power output to suppress overshoot and dampen oscillation—achieving typical stability of ±0.3°C under steady-state conditions at 37°C. The absence of active humidity control simplifies maintenance and eliminates condensation-related contamination risks, making it especially suitable for non-hygroscopic samples, dried reagent storage, or protocols where moisture interference must be avoided.

Key Features

• Fuzzy PID temperature controller with real-time deviation compensation, enabling rapid thermal equilibration and minimal fluctuation (±0.3°C typical stability at setpoint)
• Forced-air convection system with intelligent fan-speed modulation: fan RPM automatically reduces during thermal stabilization to minimize shear stress on sensitive biological samples while maintaining uniformity
• Double-door structure—outer insulated door and inner tempered glass observation window—with interlocked safety cutoff: heating and fan operation cease immediately upon inner-glass door opening to prevent thermal shock and eliminate temperature overshoot
• Mirror-polished 304 stainless-steel interior chamber resistant to corrosion, easy to decontaminate, and compatible with common laboratory disinfectants (e.g., 70% ethanol, hydrogen peroxide vapor)
• Independent mechanical over-temperature protection circuit (optional): physically isolated from the main controller, activates at user-defined threshold (e.g., 42°C) and cuts power permanently until manual reset
• RS485 serial interface (optional): supports Modbus RTU protocol for integration into centralized lab monitoring systems or SCADA platforms

Sample Compatibility & Compliance

The DHP series accommodates standard cell culture vessels—including T-flasks, Petri dishes, multi-well plates, and roller bottles—across its full capacity range (16 L to 1000 L). Its dry, non-condensing environment ensures compatibility with desiccation-sensitive media components and avoids water-mediated degradation of hydrophobic substrates. While not certified for ISO Class 5 cleanroom use, the optional UV-C germicidal lamp (254 nm) enables routine decontamination of airborne and surface-borne microorganisms between runs—supporting adherence to GLP documentation requirements for equipment qualification. The incubator meets IEC 61010-1:2010 safety standards for electrical laboratory equipment and complies with China’s GB 4793.1–2007 equivalent. It does not conform to USP , ISO 14644, or FDA 21 CFR Part 11 out-of-the-box; however, optional data-logging modules with audit-trail-enabled firmware may be configured to support GxP-aligned validation protocols when deployed with qualified software.

Software & Data Management

The base model includes an integrated LCD interface with intuitive menu navigation and parameter lockout functionality. Optional multi-segment programmable controllers offer advanced temporal control: users can define up to seven independent programs, each comprising nine sequential steps with configurable temperature setpoints, ramp rates (°C/min), dwell times (0–5999 minutes), and fan-speed profiles. All program logs—including start/stop timestamps, setpoint deviations, and alarm events—are timestamped and stored internally (non-volatile memory). When paired with the RS485 interface and third-party SCADA software (e.g., Ignition, LabVIEW), continuous temperature telemetry can be exported in CSV or OPC UA format. Thermal printer output (optional) provides hard-copy traceability compliant with internal QA checklists, though electronic records require supplementary validation per ALCOA+ principles.

Applications

• Mammalian and insect cell line propagation under defined thermal conditions (e.g., CHO, HEK293, Sf9)
• Bacterial and fungal cultivation for antibiotic susceptibility testing or strain preservation
• Enzyme kinetics studies requiring strict thermal control during reaction incubation
• Hybridization oven alternative for membrane-based nucleic acid blotting (e.g., Southern/Northern blots)
• Accelerated stability testing of pharmaceutical excipients and solid dosage forms per ICH Q1A(R2)
• Pre-incubation of agar plates prior to streaking or colony isolation

FAQ

Is this incubator suitable for CO₂-dependent cell cultures?
No. The DHP series lacks CO₂ regulation, humidity control, and pH-stabilizing mechanisms; it is intended exclusively for ambient-air, dry-heat applications.
Can temperature uniformity be validated per ISO 14644 or ASTM E2875?
Yes—chamber mapping per ASTM E2875-22 is feasible using calibrated thermocouple probes; however, the unit itself does not include built-in sensor redundancy or automated mapping routines.
What is the maximum allowable ambient operating temperature?
The recommended ambient range is 15–30°C; operation above 30°C may impair cooling recovery after door openings and reduce long-term heater lifespan.
Does the UV sterilization option meet ISO 15883 standards for reprocessing?
No—the UV lamp is designed for periodic chamber surface decontamination only and does not fulfill the exposure time, irradiance, or dosimetry requirements of ISO 15883-1 for medical device reprocessing.
Is firmware upgrade capability available?
Firmware updates are supported via USB-to-RS232 adapter and proprietary utility software provided by YiHeng upon request; version history and release notes are documented in the Equipment Qualification Package (EQP).