Stuart SBH130D & SBH200D Digital Metal Block Heaters

Overview

The Stuart SBH130D and SBH200D series are precision-engineered digital metal block heaters designed for consistent, contact-based thermal incubation of samples in vials, tubes, and microcentrifuge containers. Unlike water baths, these dry-block instruments utilize solid aluminum heating blocks with precisely machined wells to deliver rapid, contamination-free, and maintenance-light temperature control—ideal for applications requiring sterility, low evaporation risk, or compatibility with organic solvents. The core architecture employs a high-efficiency resistive heating element coupled with a closed-loop PID controller and dual-sensor feedback (setpoint and block surface), enabling tight regulation across the full operating range. The SBH130D supports up to 130°C, while the SBH200D extends capability to 200°C—making it suitable for enzyme inactivation, PCR pre-heat steps, solvent evaporation support, and accelerated stability testing per ICH Q1A(R3) guidelines.

Key Features

• Digital PID temperature control with high-brightness LED display showing both setpoint and real-time block temperature (0.1°C resolution)
• Exceptional thermal performance: ±0.1°C stability and uniformity at 37°C; ±0.1°C uniformity at 130°C for 3-block variants (SBH130D/3, SBH200D/3), ensuring reproducibility across multi-well workflows
• Rapid heating kinetics: reaches 100°C in ≤12 minutes from ambient, minimizing protocol downtime
• Modular block configuration: two standard models (SBH130D, SBH200D) accept two interchangeable aluminum blocks; extended versions (SBH130D/3, SBH200D/3) accommodate three blocks simultaneously—enabling parallel processing of diverse tube formats (e.g., 0.2 mL PCR strips, 1.5 mL Eppendorf tubes, 15 mL conical tubes)
• Robust mechanical design: anodized aluminum housing, thermal insulation layer, and overtemperature cut-off protection (independent hardware limiter) compliant with EN 61010-1:2019 safety standards
• Low power consumption and compact footprint (235 × 280 × 115 mm for 2-block units), optimized for benchtop integration in QC labs, clinical diagnostics, and academic research environments

Sample Compatibility & Compliance

The SBH series accommodates standardized tube geometries via user-replaceable aluminum blocks—available separately in configurations for 0.2 mL, 0.5 mL, 1.5 mL, 2.0 mL, 13 mm, 15 mm, and 16 mm diameter vessels. No direct liquid contact eliminates cross-contamination risks and supports GLP-compliant sample handling. All units are CE-marked and conform to IEC 61010-1 for laboratory electrical equipment safety. While not equipped with built-in data logging or audit trail functionality, the instruments meet foundational requirements for use in ISO/IEC 17025-accredited testing laboratories when operated within documented SOPs. For regulated environments (e.g., pharmaceutical QC), integration with external calibrated thermometers (traceable to NPL or NIST standards) is recommended for periodic verification per ASTM E2251–22.

Software & Data Management

The SBH130D and SBH200D operate as standalone analog-digital hybrid instruments with no embedded firmware update capability or USB/RS-232 connectivity. Temperature setpoints and real-time readings are managed exclusively via front-panel keypad and LED display. As such, they do not support FDA 21 CFR Part 11 electronic record compliance out-of-the-box. However, their deterministic thermal behavior and stable output make them suitable for inclusion in validated workflows where manual entry into LIMS or ELN systems is performed under controlled documentation procedures. Optional third-party temperature dataloggers (e.g., Testo 176 T4) may be used for independent validation and trending of block performance over time.

Applications

• Enzyme reaction incubation and heat inactivation (e.g., restriction digests, ligase stop reactions)
• Pre-heating samples prior to HPLC injection or GC analysis to ensure consistent viscosity and vapor pressure
• Controlled thawing of cryopreserved cell suspensions and reagents at defined ramp rates
• Accelerated degradation studies in stability chambers (support heating step for ICH Q1A long-term/intermediate condition simulations)
• Sample equilibration for viscometry, density measurement, and refractometry where bath immersion is impractical
• Quality control release testing of raw materials requiring precise thermal conditioning before assay (e.g., polymer melt index prep, surfactant cloud point determination)

FAQ

What is the maximum recommended operating time at 200°C?
Continuous operation at 200°C is rated for up to 8 hours per cycle. Extended use beyond this requires a 30-minute cooldown period to preserve heater longevity and block dimensional stability.
Are replacement blocks supplied with calibration certificates?
Standard aluminum blocks are supplied without individual calibration certificates. Traceable calibration (per ISO/IEC 17025) can be arranged through Stuart’s authorized service partners using NIST-traceable reference thermometers.
Can the SBH200D be used for sterilization cycles?
No. These units are not designed for sterilization (i.e., achieving and holding ≥121°C for ≥15 min under saturated steam). They are intended for thermal conditioning only—not microbial kill validation.
Is the unit compatible with 110 V / 60 Hz power supplies?
No. The SBH series is configured exclusively for 230 V AC, 50 Hz input. Operation on 110 V systems requires an externally rated isolation transformer meeting EN 61558-2-6 specifications.
How often should temperature uniformity be verified?
Per ISO/IEC 17025 Clause 6.4.10, uniformity verification is recommended before first use, after relocation, following any mechanical impact, and at least quarterly during routine operation—using a minimum of five calibrated probe positions per block.