MKN HSS-1 Digital Precision Circulating Water Bath

Overview

The MKN HSS-1 Digital Precision Circulating Water Bath is an engineered thermal stability platform designed for laboratory applications requiring precise, reproducible, and uniform temperature control across extended operation cycles. Based on the principle of forced convection via a stainless steel centrifugal circulation pump, the system maintains thermal equilibrium through continuous fluid movement—minimizing vertical and lateral temperature gradients within the bath chamber. Its far-infrared heating architecture ensures rapid thermal response without localized hot spots, while the integrated magnetic stirrer enhances homogeneity for samples sensitive to thermal stratification. The unit operates within a calibrated range of ambient temperature (RT) to 95°C, with digital PID feedback control delivering stable setpoint maintenance under dynamic load conditions—such as when introducing room-temperature vessels or initiating solvent evaporation protocols.

Key Features

• Precision temperature regulation with ±0.5°C uniformity across the full working volume (240 × 170 × 160 mm), validated per ASTM E1137/E1137M for liquid-bath thermal performance testing
• Far-infrared heating module combined with high-efficiency thermal insulation to reduce power consumption and improve thermal recovery time after sample insertion
• Dual-mode circulation system: 6 L/min stainless steel pump supports both internal bath homogenization and external jacketed reactor or condenser cooling loops
• Robust 304 stainless steel construction—electropolished interior surface resists corrosion from aqueous buffers, organic solvents, and mild acidic/basic solutions
• LED digital display with real-time temperature readout and intuitive keypad interface; no software driver required for basic operation
• Integrated magnetic stirring function with variable speed control (0–1200 rpm), enabling simultaneous thermal and mechanical agitation for dissolution, extraction, or enzymatic reaction support

Sample Compatibility & Compliance

The HSS-1 accommodates standard laboratory glassware including round-bottom flasks (up to 2 L), beakers, test tubes, and immersion probes. Its open-bath geometry allows direct placement of reaction vessels, while the external circulation port (G1/4″ BSP) enables integration with jacketed reactors, rotary evaporators, or custom thermal manifolds. The device complies with IEC 61010-1:2010 safety requirements for electrical equipment used in laboratory environments. While not certified for Class I Division 1 hazardous locations, it meets EN 61326-1 electromagnetic compatibility standards for use in general analytical laboratories. No intrinsic safety rating is assigned; operation with flammable solvents requires adherence to local fire codes and supplemental ventilation controls.

Software & Data Management

The HSS-1 operates as a standalone analog-digital hybrid instrument with no embedded firmware-based data logging or network connectivity. Temperature setpoints and real-time readings are displayed locally only. For traceable calibration records or GLP/GMP-compliant workflows, users may pair the unit with external USB or RS-232 temperature dataloggers (e.g., Omega OM-DAQPRO-5300 or Testo 176 T4). Optional analog voltage output (0–5 V DC proportional to measured temperature) is available upon request for integration into SCADA or PLC-based environmental monitoring systems. All calibration procedures follow ISO/IEC 17025-recommended practices using NIST-traceable reference thermometers.

Applications

• Controlled-temperature sample incubation for microbiological assays and cell culture pre-warming
• Thermal equilibration of viscometers, density meters, and refractometers prior to measurement
• Supporting distillation, reflux, and Soxhlet extraction setups with consistent heat input
• Accelerated stability testing of pharmaceutical formulations per ICH Q1A(R2) guidelines
• Pre-heating and holding of reagents in clinical chemistry analyzers and ELISA workflow stations
• Calibration verification of thermocouples, RTDs, and infrared thermometers against a stable thermal reference

FAQ

What is the maximum recommended operating temperature for continuous use?
The HSS-1 is rated for sustained operation up to 95°C. Prolonged use above 90°C may accelerate seal degradation; periodic inspection of lid gasket integrity is advised.
Can the unit maintain temperature stability during external circulation?
Yes—the 6 L/min pump sustains ±0.5°C uniformity even when driving 3 m of 6 mm OD silicone tubing to an external load, provided total system volume does not exceed 8 L.
Is the magnetic stirrer compatible with PTFE-coated stir bars?
Yes; the stir plate operates at frequencies optimized for standard 20–40 mm PTFE or glass-coated stir bars without inducing resonance or vibration-induced noise.
Does the HSS-1 meet FDA 21 CFR Part 11 requirements?
No—this is a non-networked, non-auditable device with no electronic recordkeeping capability. It may be used in Part 11 environments only as a manually operated ancillary tool with paper-based log entries.
What maintenance intervals are recommended for long-term reliability?
Inspect pump impeller and drain valve quarterly; replace bath fluid annually or after 500 operational hours—deionized water with 0.5% biocide is recommended for microbial control.