TAITEC SM-05N / SJ-07N / SP-12N Series Precision Circulating Water Baths

Overview

The TAITEC SM-05N, SJ-07N, and SP-12N series are precision-engineered circulating water baths designed for reproducible thermal control in life science, clinical diagnostics, and quality control laboratories. These units operate on the principle of resistive heating combined with jet-flow circulation and high-resolution thermistor-based PID feedback control—ensuring stable thermal environments across a broad operating range. Unlike generic immersion heaters, each model integrates calibrated temperature sensing at the bath fluid level—not the heater block—minimizing thermal lag and improving spatial uniformity. The SM-05N serves as an entry-level platform optimized for routine incubation and enzyme kinetics (e.g., restriction digests, ligations); the SJ-07N extends capability to higher temperatures required for serum inactivation and hybridization protocols; while the SP-12N is engineered for sustained operation up to 100°C, supporting applications such as thermophilic microbial culture, capillary electrophoresis preheating, and spectrophotometer thermal conditioning. All models feature internal recirculation only—no external loop ports—and are compatible with optional stainless-steel insulated baths (Model F), vapor-retaining covers (PF-C), and dedicated antifreeze solutions for sub-ambient operation when used with external chillers.

Key Features

• PID temperature control with thermistor sensor ensures ±0.1°C stability under defined reference conditions (25°C ambient, 6 L water, no thermal load, +37°C setpoint)
• Two independent timer functions: audible Set-Time Alert Timer (1 min–99 h 59 min) and programmable Auto-Off Timer (same range), enabling precise protocol timing and unattended shutdown
• Adjustable jet-flow agitation (SJ-07N and SP-12N) allows fine-tuning of fluid dynamics to minimize surface turbulence during microtube or cuvette placement
• Dual-level safety architecture: hardware-level dry-run prevention via float switch + software-monitored fault detection (sensor open/short, memory corruption, alarm misconfiguration)
• Low operational water level (55 mm above bath base with C-type polyethylene bath) reduces risk of overflow when inserting large vessels or multi-well plates
• Energy-efficient design validated per IEC 61000-3-2: power consumption reduced by up to 40% when using optional PF-C cover under standardized test conditions (+37°C, 6 L water, 25°C ambient)
• Non-volatile error logging retains diagnostic data through power cycles—critical for GLP/GMP traceability and root-cause analysis

Sample Compatibility & Compliance

These baths accommodate standard laboratory containers including 0.2–2.0 mL PCR tubes, 15–50 mL conical tubes, cuvettes, and glass flasks up to Ø80 mm diameter. The C-type polyethylene bath (included) is rated for continuous use ≤70°C; operation ≥70°C requires the optional stainless-steel insulated bath (Model F). For sub-ambient applications (down to –20°C setpoint), external chiller integration is mandatory—TAITEC recommends pairing with certified immersion coolers and proprietary antifreeze solution below +7°C. Units comply with JIS B 7952:2017 (Laboratory Equipment — General Requirements) and meet electromagnetic compatibility requirements per JIS C 61326-1. While not intrinsically refrigerated, their architecture supports FDA 21 CFR Part 11–aligned workflows when used with optional AOC-2 safety signal output module for external event logging.

Software & Data Management

No embedded software or PC connectivity is provided; all operation is performed via front-panel UP/DOWN keys and digital LED display. However, the AOC-2 optional safety signal output cable enables hardwired connection to external PLCs, chart recorders, or LIMS interfaces—transmitting discrete logic signals upon activation of any safety alarm (low water, overtemperature, sensor fault). This analog-compatible interface satisfies basic audit-trail requirements in regulated environments where electronic records must be independently verifiable. Firmware updates are not field-serviceable; calibration verification and sensor replacement require authorized TAITEC service centers—documentation includes NIST-traceable calibration certificates upon request.

Applications

• Enzyme reaction incubation (restriction endonucleases, polymerases, phosphatases) requiring tight thermal consistency across multi-sample batches
• Serum heat inactivation (56°C, 30 min) and media pre-warming prior to cell culture handling
• Nucleic acid hybridization (Southern/Northern blotting) where uniform temperature distribution prevents probe dissociation artifacts
• Thermophilic bacterial cultivation (e.g., Geobacillus stearothermophilus) using SP-12N at 65–100°C with vapor management system
• Preconditioning of optical components (e.g., quartz cuvettes, capillary arrays) to eliminate thermal drift during absorbance or fluorescence measurements
• QC/QA validation of temperature-sensitive reagents—including lot-to-lot stability testing per ISO/IEC 17025 clause 5.4.2

FAQ

Do these units provide active cooling?
No. The SM-05N, SJ-07N, and SP-12N are heating-only systems. Sub-ambient operation requires integration with an external chiller and TAITEC-recommended antifreeze solution.
What is the minimum usable water level?
55 mm above the bath bottom when using the included C-type polyethylene bath—verified to prevent dry-run under typical vessel-loading conditions.
Can I use tap water at temperatures above 80°C?
Not recommended. Prolonged use of untreated tap water above 70°C accelerates scaling and steam generation, reducing heater lifespan and compromising temperature uniformity.
Is the ±0.1°C stability specification guaranteed across the full temperature range?
No. That value is measured under controlled reference conditions (25°C ambient, 6 L water, +37°C setpoint, no thermal load). Stability degrades slightly at extremes (e.g., ±0.15°C at +95°C); consult TAITEC Application Note AN-SJ07N-03 for empirical deviation profiles.
Does the unit support external temperature probes for sample monitoring?
No. Temperature sensing is fixed to the bath fluid. For sample-core measurement, users must deploy independent calibrated probes (e.g., PT100) and log data externally.
Are CE or UL certifications available?
Units conform to Japanese regulatory standards (PSE mark applicable). CE/UL certification is not held; customers requiring those marks should contact TAITEC’s EU/US distribution partners for regionally compliant variants.