MKN HH-S11.8 Digital Display Single-Row 8-Position Water Bath

Overview

The MKN HH-S11.8 Digital Display Single-Row 8-Position Water Bath is a precision-engineered laboratory thermal management instrument designed for stable, uniform, and repeatable temperature control in aqueous environments. Operating on the principle of convective heat transfer via immersion in a thermostatically regulated water medium, this unit delivers consistent thermal energy across all eight sample positions—enabling simultaneous processing of multiple vessels under identical thermal conditions. Its design adheres to fundamental requirements for benchtop heating applications in analytical chemistry, pharmaceutical quality control, molecular biology, and materials science laboratories. The water bath’s operational range—from ambient +5 °C up to 100 °C—covers critical protocols including enzyme incubation, sample thawing, reagent warming, solvent evaporation, and gentle hydrolysis reactions. Structural integrity is ensured by a fully welded 304 stainless steel inner tank, lid, and surrounding ring, providing long-term resistance to oxidation, chemical splashes, and thermal cycling fatigue.

Key Features

• Single-row 8-position configuration optimized for high-throughput sample handling without cross-contamination or thermal shadowing between wells.
• Far-infrared heating system engineered for rapid thermal equilibrium—typical heat-up time from 25 °C to 60 °C is under 18 minutes, minimizing workflow delays.
• Digital PID-based temperature controller featuring dual-integration A/D conversion and high-stability operational amplifier circuitry for reduced drift and enhanced setpoint fidelity.
• LED digital display provides real-time readout of actual and set temperatures with 0.1 °C resolution, supporting traceable manual recording and visual verification.
• Temperature uniformity maintained within ±0.5 °C across all eight wells at steady state; temperature stability held at ±1 °C over extended operation (≥8 h) under standard ambient conditions (22–25 °C).
• Robust mechanical construction includes reinforced base plate, anti-slip rubber feet, and integrated overflow drainage channel to prevent spill-related electrical hazards.

Sample Compatibility & Compliance

The HH-S11.8 accommodates standard laboratory glassware including 10–50 mL test tubes, 100–250 mL Erlenmeyer flasks, and low-form beakers up to 120 mm in height. Well diameter is 65 mm with 75 mm center-to-center spacing, ensuring compatibility with common rack systems and automated pipetting workflows. All wetted surfaces comply with ISO 8573-1 (purity class 4) for non-reactive contact with aqueous solutions. While not certified for IEC 61010-1 Class II or UL 61010B-1 out-of-the-box, the unit meets essential safety provisions for Class I laboratory equipment per GB 4793.1–2007 (equivalent to EN 61010-1:2010), including earthed chassis, overtemperature cutoff (105 °C mechanical limiter), and IP20 ingress protection. Documentation supports GLP-compliant recordkeeping when paired with external calibration logs per ISO/IEC 17025:2017 Annex A.3.

Software & Data Management

This analog-digital hybrid water bath operates without embedded firmware or network connectivity—ensuring electromagnetic compatibility in sensitive instrumentation zones (e.g., adjacent to HPLC detectors or mass spectrometers). All temperature data are displayed locally via LED interface; no proprietary software, drivers, or cloud dependencies are required. For audit-trail compliance in regulated environments (e.g., FDA 21 CFR Part 11 or EU GMP Annex 11), users may integrate optional external data loggers (e.g., Omega OM-DAQPRO-5300 series) via 4–20 mA or 0–5 V analog output (available upon request with OEM modification). Calibration certificates traceable to NIM (National Institute of Metrology, China) are provided with each unit, including as-found/as-left data at three points (37 °C, 60 °C, 85 °C).

Applications

• Controlled-rate thawing of cryopreserved cell suspensions and serum batches in clinical and biobanking labs.
• Standardized digestion of biological matrices prior to ICP-MS or AAS analysis (e.g., EPA Method 3050B).
• Constant-temperature conditioning of viscosity standards (e.g., Cannon-Fenske viscometer calibration oils) per ASTM D445.
• Accelerated stability testing of topical formulations under ICH Q1A(R2) guidelines (40 °C/75% RH simulated via water bath + humidity chamber coupling).
• Pre-warming of PCR master mixes and restriction enzyme buffers to minimize condensation-induced dilution errors.
• Distillation support for solvent recovery in synthetic organic chemistry workflows (e.g., rotary evaporation feed preheating).

FAQ

What is the maximum recommended water level for optimal thermal performance?
Fill to 20–30 mm below the top edge of the stainless steel tank—approximately 12–14 L capacity—to ensure full immersion of sample vessels while preventing overflow during thermal expansion.
Can this unit be used with corrosive or organic solvents?
No. The HH-S11.8 is validated exclusively for aqueous media. Use of acetone, chloroform, or strong acids/bases will compromise gasket integrity and accelerate tank pitting.
Is external calibration required before first use?
Yes. Although factory-calibrated, ISO/IEC 17025-accredited laboratories must perform initial verification using a NIST-traceable PRT or thermistor probe at three points across the operating range.
Does the unit include a drain valve?
No. Drainage requires manual tilting or siphoning; an optional bottom-mounted brass drain valve kit (Part No. MKN-DBV-01) is available separately.
What is the typical service life under continuous operation?
With biannual descaling (using 5% citric acid solution) and avoidance of dry-run operation, mean time between failures exceeds 12,000 hours based on field data from 2020–2023 installations.