MKN 501 Super Constant-Temperature Water Bath

Overview

The MKN 501 Super Constant-Temperature Water Bath is an engineered thermal platform designed for precise, stable, and reproducible temperature control in laboratory environments. It operates on the principle of convective heat transfer within a liquid medium—specifically deionized water or aqueous solutions—to maintain uniform thermal conditions across the bath chamber. Unlike basic immersion heaters, this unit integrates far-infrared heating technology with a high-stability analog circuit architecture, including dual-integration A/D conversion and precision operational amplifiers, enabling accurate analog-to-digital signal processing for responsive PID-based temperature regulation. Its stainless-steel construction (equivalent to ASTM A240 Type 304) ensures long-term resistance to oxidation, chemical exposure, and thermal fatigue—critical for repeated use in analytical, pharmaceutical, and life science workflows. The system supports both static incubation and dynamic thermal conditioning via integrated magnetic stirring, reducing thermal stratification and accelerating thermal equilibration of samples.

Key Features

• Stable digital PID temperature controller with LED display offering real-time resolution to 0.1 °C and setpoint repeatability within ±0.2 °C over extended operation.
• Far-infrared heating element providing rapid thermal response and minimized localized hot spots—contributing to short thermal equilibrium times (<15 min from ambient to 60 °C under standard load).
• Magnetic stirring mechanism (built-in, variable speed) ensures homogenous temperature distribution throughout the bath volume, directly supporting improved reproducibility in kinetic assays and dissolution testing.
• Stainless-steel bath chamber (280 × 240 × 180 mm) with 180 mm depth enables compatibility with standard laboratory glassware including 1-L flasks, centrifuge tubes, and reaction vessels up to 500 mL immersion depth.
• Integrated recirculating pump (6 L/min flow rate, stainless-steel impeller and housing) supports external temperature-controlled loops—for applications such as jacketed reactor control, column oven integration, or calorimeter thermal management.
• Robust mechanical design compliant with IEC 61010-1 safety standards for laboratory electrical equipment; includes over-temperature cut-off and dry-run protection.

Sample Compatibility & Compliance

The MKN 501 accommodates a wide range of sample containers—including borosilicate glass, polypropylene, and PTFE-lined vessels—without risk of material degradation at temperatures up to 100 °C. Its uniformity specification of ±0.5 °C meets the thermal stability requirements outlined in USP for sterile compounding support environments and ASTM D1557 for soil moisture conditioning protocols. While not certified for GMP manufacturing environments out-of-the-box, the unit’s deterministic control logic and absence of software-based data logging make it suitable for GLP-aligned laboratories where manual temperature verification and logbook documentation are standard practice. No embedded firmware or network interface is present, eliminating cybersecurity concerns associated with connected lab devices.

Software & Data Management

The MKN 501 operates as a standalone analog-digital hybrid instrument with no embedded operating system, cloud connectivity, or proprietary software dependency. Temperature setpoints and real-time readings are managed exclusively via front-panel controls and the LED display. All operational parameters are manually recorded—supporting audit-ready documentation in accordance with ISO/IEC 17025 clause 7.7 (result reporting) and FDA 21 CFR Part 11 principles when paired with controlled paper-based or validated electronic lab notebook (ELN) systems. For users requiring automated data capture, third-party USB or RS-232 temperature loggers (e.g., Omega OM-DAQPRO-5300 series) may be interfaced externally via the unit’s analog voltage output (0–5 V DC proportional to temperature), subject to calibration traceability per NIST SP 800-53.

Applications

• Controlled-temperature enzymatic reactions and protein denaturation studies requiring sustained thermal stability over hours.
• Accelerated stability testing of pharmaceutical formulations per ICH Q1A(R2) guidelines using water-jacketed vial holders.
• Calibration of thermistors, RTDs, and liquid-in-glass thermometers against NIST-traceable references.
• Support of Soxhlet extraction, Kjeldahl digestion, and distillation setups where consistent bath temperature directly impacts analyte recovery and reproducibility.
• Pre-warming of culture media, agar plates, and reagent solutions prior to microbiological inoculation or cell-based assays.
• Thermal conditioning of polymer melts and viscosity standards during rheological pre-equilibration procedures.

FAQ

Does the MKN 501 support external temperature probe input for chamber monitoring?
No—the unit relies solely on its internal Pt100-class sensor; no auxiliary probe port or calibration offset adjustment is provided.
Can the circulation pump operate without water in the bath?
No—dry-run operation will damage the stainless-steel pump assembly; built-in thermal cutoff prevents activation below 5 °C but does not detect absence of fluid.
Is the magnetic stirrer speed adjustable?
Yes—via dedicated rotary knob with 6 discrete speed settings; maximum agitation intensity is optimized for 500-mL beaker loads.
What is the maximum recommended fill volume for optimal thermal uniformity?
22 L (90% of nominal capacity); exceeding this level may impair surface convection and compromise ±0.5 °C uniformity specification.
Are replacement parts such as heater elements or pump modules available through MKN authorized channels?
Yes—OEM spare parts (P/N: MKN-501-HEAT-01, MKN-501-PUMP-02) are distributed globally via MKN’s certified laboratory equipment partners, with lead time averaging 12–18 business days ex-warehouse Jiangsu.