MKN DHP-50 Electric Constant Temperature Incubator

Overview

The MKN DHP-50 Electric Constant Temperature Incubator is a precision-engineered laboratory incubation system designed for stable, uniform thermal environments essential in microbiological culture, cell propagation, enzyme activity studies, and long-term sample conditioning. Operating on resistive heating principles with external sheathed heating elements, the DHP-50 eliminates internal heat source interference—preventing thermal overshoot, localized hot spots, and inadvertent thermal stress on sensitive biological specimens. Its chamber maintains temperature stability within ±0.3°C and uniformity within ±0.5°C at standard operating setpoints (e.g., 37°C), meeting foundational requirements for ISO/IEC 17025-compliant calibration laboratories and GLP-aligned life science workflows. The unit complies with IEC 61010-1 safety standards for electrical equipment used in laboratory environments and incorporates fail-safe overtemperature protection aligned with EN 60335-1.

Key Features

• Microprocessor-based digital PID temperature controller with real-time display, adjustable setpoint resolution of 0.1°C, and programmable ramp-hold functionality for staged incubation protocols.
• Double-layer tempered glass observation door with silicone-sealed gasket minimizes thermal leakage while enabling non-invasive visual monitoring—critical during sterility-sensitive operations such as bacterial colony isolation or fungal growth assessment.
• Externally mounted heating elements eliminate direct contact between heat sources and the chamber interior, ensuring consistent air convection and eliminating condensation-related contamination risks common in internally heated units.
• Stainless steel 304 interior chamber resists corrosion from repeated ethanol wiping, hydrogen peroxide vapor exposure, and routine decontamination cycles—supporting compliance with USP sterile processing guidelines.
• Robust cold-rolled steel exterior with electrostatic powder coating provides mechanical durability and resistance to incidental chemical splashes encountered in shared core facility environments.
• Integrated overtemperature cutoff circuit automatically disables heating if internal sensor readings exceed user-defined safety thresholds—meeting Class II equipment requirements under IEC 61010-1.

Sample Compatibility & Compliance

The DHP-50 accommodates standard Petri dishes (90–150 mm), multi-well plates (6–96-well), culture flasks (T25–T225), and test tubes up to 20 mm diameter without airflow obstruction. Its 50 L working volume supports parallel processing of ≥12 T75 flasks or ≥48 standard Petri dishes. Chamber airflow is optimized via passive convection design—suitable for non-CO₂-dependent aerobic cultures including Escherichia coli, Bacillus subtilis, Saccharomyces cerevisiae, and primary mammalian fibroblast lines. The unit meets ASTM E171-22 specifications for environmental chamber performance verification and supports audit-ready documentation for FDA 21 CFR Part 11–aligned quality systems when paired with optional data logging accessories.

Software & Data Management

While the base DHP-50 operates via standalone digital interface, optional RS-232/USB connectivity enables integration with third-party laboratory information management systems (LIMS) and electronic lab notebooks (ELN). When configured with MKN’s optional DataLogger Pro firmware (v2.1+), the incubator records timestamped temperature values at user-selectable intervals (1–60 min), generates CSV-exportable audit trails with operator ID tagging, and supports 21 CFR Part 11–compliant electronic signatures for validation-critical applications. All firmware updates are delivered via secure HTTPS endpoint and require hardware-authenticated installation keys.

Applications

• Microbiological quality control testing in pharmaceutical manufacturing (e.g., bioburden enumeration per USP ).
• Seed germination and plant tissue culture in agricultural research facilities.
• Enzyme kinetics assays requiring precise thermal stabilization across pH gradients.
• Short-term storage of clinical isolates prior to identification or antimicrobial susceptibility testing (AST).
• Pre-incubation of ELISA plates and immunoblot membranes to reduce nonspecific binding artifacts.
• Validation of sterilization process parameters using biological indicators (e.g., Geobacillus stearothermophilus spore strips).

FAQ

What is the maximum recommended operating temperature for continuous use?
The DHP-50 is rated for sustained operation up to 65°C; prolonged use above 55°C may accelerate gasket aging and requires quarterly verification of door seal integrity.
Does the unit support external temperature calibration verification?
Yes—the internal PT100 sensor output is accessible via test points on the rear PCB; users may perform NIST-traceable calibration using a reference thermometer per ISO/IEC 17025 Clause 6.5.
Can the incubator be installed in a laminar flow hood or biosafety cabinet?
No—its passive convection design requires unobstructed ambient air exchange; placement inside containment enclosures compromises thermal stability and voids warranty coverage.
Is firmware upgrade capability included in the base configuration?
Firmware updates are supported but require purchase of MKN’s certified update kit (P/N: DHP-UPG-KIT-2024), which includes cryptographic authentication tokens and version-locked binaries.
What documentation accompanies the unit for regulatory submissions?
Each shipment includes Factory Calibration Certificate (traceable to CNAS-accredited lab), CE Declaration of Conformity, IEC 61010-1 Safety Test Report, and full technical manual with maintenance schedules and spare parts list.