MKN HH-S2 Digital Constant-Temperature Water Bath
| Brand | MKN |
|---|---|
| Model | HH-S2 |
| Heating Power | 450 W |
| Temperature Control Range | Ambient to 100 °C |
| Temperature Stability | ±0.5 °C |
| Chamber Dimensions (W×D×H) | 300 × 150 × 150 mm |
| External Dimensions (W×D×H) | 440 × 180 × 190 mm |
| Number of Wells | 2 |
| Construction | Stainless Steel Inner Tank (One-Piece Deep Drawn) |
| Control Type | Digital PID Temperature Controller with LED Display |
Overview
The MKN HH-S2 Digital Constant-Temperature Water Bath is a precision-engineered laboratory thermal platform designed for stable, uniform, and repeatable temperature control in aqueous environments. Operating on the principle of convective heat transfer through a thermostatically regulated water medium, the HH-S2 delivers consistent thermal energy across its dual-well chamber—enabling reliable sample conditioning, enzymatic reactions, cell culture incubation, reagent warming, and temperature-dependent chemical processes. Unlike open-heating plates or dry-block alternatives, water baths provide superior thermal homogeneity (< ±0.3 °C spatial variation within the working zone) and gentle, non-evaporative heating—critical for maintaining biological integrity and solvent stability during prolonged experiments. Its robust stainless-steel tank, one-piece deep-drawn construction ensures long-term corrosion resistance against aqueous buffers, saline solutions, and mild organic solvents commonly used in life science and analytical workflows.
Key Features
- Two independent 300 × 150 × 150 mm wells with seamless, electropolished 304 stainless-steel interiors—resistant to pitting, staining, and chloride-induced degradation.
- Digital PID temperature controller with high-brightness LED display, enabling real-time setpoint entry, actual temperature readout, and deviation monitoring with 0.1 °C resolution.
- 450 W tubular heating element with over-temperature cut-off and current-limiting circuitry—ensuring rapid heat-up (≤70 min to reach 100 °C from ambient) without thermal overshoot.
- Insulated outer casing and low-surface-temperature housing design (≤45 °C at 100 °C internal setpoint), meeting IEC 61010-1 safety requirements for laboratory equipment.
- Front-panel accessible calibration offset adjustment (±5.0 °C range), supporting traceable verification against NIST-traceable reference thermometers.
Sample Compatibility & Compliance
The HH-S2 accommodates standard laboratory glassware including beakers (up to 1000 mL), Erlenmeyer flasks, test tubes, centrifuge tubes, and immersion probes—without requiring custom fixtures. Its open-bath geometry allows unrestricted access for pipetting, stirring, and sensor insertion. The unit complies with ISO/IEC 17025-relevant environmental control criteria for calibration laboratories and satisfies basic GLP infrastructure requirements for temperature-controlled sample preparation. While not certified for Class II biosafety or explosion-proof operation, it is routinely deployed in ISO 13485-certified medical device R&D labs and USP compliant analytical method development environments—particularly where water-mediated thermal equilibration is specified (e.g., dissolution testing per USP , enzyme kinetics per ASTM E2577).
Software & Data Management
The HH-S2 operates as a standalone analog-digital hybrid instrument with no embedded firmware or network interface. All operational parameters—including setpoint, measured temperature, and elapsed time—are visible via the front-panel LED display only. For laboratories requiring audit-ready records, optional external data loggers (e.g., Omega OM-CP-HITEMP140 or Testo 176 T4) may be integrated using the built-in 10 kΩ thermistor output port (standard 2-wire configuration). This analog output supports continuous third-party logging compatible with FDA 21 CFR Part 11–compliant systems when paired with validated acquisition software and electronic signature protocols. No proprietary drivers, cloud services, or mobile apps are associated with this model—ensuring deterministic behavior and minimizing cybersecurity surface area in regulated settings.
Applications
- Temperature stabilization of enzyme solutions prior to kinetic assays (e.g., amylase, protease, or DNase activity measurements at 37 °C or 60 °C).
- Controlled rehydration of lyophilized reagents and standards in QC/QA laboratories following ISO/IEC 17025 clause 7.7.
- Pre-warming of culture media, agarose gels, and antibody diluents in molecular biology and histopathology workflows.
- Supporting distillation, reflux, and solvent extraction procedures per AOAC 995.12 and EPA Method 3510C.
- Calibration bath for liquid-in-glass thermometers, RTDs, and thermocouples in metrology support roles.
FAQ
Does the HH-S2 support external temperature probe input for chamber monitoring?
No—the unit relies solely on its internal thermistor for feedback control. However, the analog 10 kΩ output port enables connection to an external datalogger for independent validation.
Is the stainless-steel tank suitable for use with saltwater or phosphate-buffered saline (PBS)?
Yes—304 stainless steel provides adequate resistance to chlorides and phosphates at temperatures ≤100 °C; however, extended exposure to >0.9% NaCl above 80 °C is not recommended without post-use rinsing.
Can the HH-S2 maintain temperature accuracy under continuous lid-open conditions?
Open-lid operation increases evaporative heat loss and may reduce stability to ±1.0 °C; for optimal performance, use with supplied acrylic cover or compatible insulated lids.
What is the expected service life of the heating element under normal laboratory use?
Rated for ≥10,000 hours of cumulative operation at nominal load; periodic descaling (every 3–6 months in hard-water areas) extends longevity and preserves thermal response fidelity.
Is user-accessible calibration documented in the manual?
Yes—the operator manual includes step-by-step instructions for offset calibration using a certified reference thermometer, aligned with ISO/IEC 17025 clause 6.5.2 for in-house verification.
