Yiheng LRH Series Low-Temperature Biochemical Incubator

Overview

The Yiheng LRH Series Low-Temperature Biochemical Incubator is an engineered environmental control system designed for precise, stable, and reproducible temperature management across a broad operational range—from sub-zero cryogenic storage conditions to standard incubation temperatures. Unlike general-purpose refrigerated cabinets, the LRH series employs active forced-air convection with optimized airflow distribution and high-efficiency refrigeration architecture based on R134a—a non-ozone-depleting, low-global-warming-potential (GWP) refrigerant compliant with international environmental regulations including the Montreal Protocol and EU F-Gas Regulation. Its dual-mode thermal control strategy enables accurate setpoint attainment and minimal thermal overshoot, particularly critical during transitions between refrigerated and ambient-temperature protocols. The unit meets fundamental design requirements for biochemical stability testing, serum and media storage, microbial culture under controlled cold stress, and long-term sample preservation in academic, pharmaceutical, and clinical laboratory environments.

Key Features

• Mirror-finished stainless-steel interior chamber with seamless, radius-rounded corners (≥R25) for enhanced cleanability, corrosion resistance, and compliance with ISO 14644-1 Class 7 cleanroom-compatible surface standards.
• Microprocessor-based PID temperature controller with real-time digital display, programmable ramp-soak profiles, and auto-tuning capability—ensuring setpoint accuracy within ±0.1°C and minimizing thermal drift over extended operation cycles.
• High-efficiency hermetic compressor and low-noise centrifugal circulation fan (≤52 dB[A] at 1 m), jointly contributing to ≥40% faster cooling recovery vs. legacy R22-based systems and reduced energy consumption per cycle (tested per IEC 62304 Annex C).
• Dedicated Ø25 mm access port on the left sidewall, fitted with silicone gasket and removable plug—enabling continuous external probe insertion for independent temperature validation (e.g., NIST-traceable thermocouples or Pt100 sensors) without compromising chamber integrity.
• Independent mechanical over-temperature cut-off circuit (optional), physically isolated from the main controller, meeting IEC 61000-4-2/4-4 immunity requirements and providing fail-safe interruption if internal temperature exceeds user-defined safety thresholds (configurable from 0 to 70°C).
• Standard RS485 Modbus RTU interface (optional thermal printer module) supports integration into centralized lab monitoring systems, enabling time-stamped data logging, remote parameter adjustment, and audit-ready record retention aligned with FDA 21 CFR Part 11 electronic record requirements when paired with validated software platforms.

Sample Compatibility & Compliance

The LRH series accommodates a wide spectrum of temperature-sensitive biological and chemical specimens—including but not limited to fetal bovine serum (FBS), antibiotic stock solutions, lyophilized enzyme preparations, bacterial culture plates (e.g., E. coli DH5α at 4°C pre-incubation), and stability-test samples per ICH Q1A(R2). Chamber geometry and shelf load capacity (up to 30 kg distributed across three adjustable levels) ensure uniform thermal exposure regardless of vessel type (e.g., 50 mL conical tubes, 100 mm Petri dishes, or 1 L media bottles). All models comply with GB/T 13950–2012 (Chinese national standard for incubators), carry CE marking per EN 61000-6-3 (EMC) and EN 61000-6-2 (immunity), and are constructed using flame-retardant materials meeting UL 94 V-0 specifications. No hazardous substances (Pb, Cd, Hg, Cr⁶⁺, PBB, PBDE) are used in structural components, satisfying RoHS Directive 2011/65/EU.

Software & Data Management

When equipped with the optional RS485 communication module, the LRH incubator interfaces seamlessly with third-party laboratory information management systems (LIMS) or custom SCADA platforms via Modbus RTU protocol. Data output includes real-time chamber temperature, setpoint, compressor status, fan speed, and alarm events—each timestamped with millisecond precision. Raw logs can be exported in CSV format for statistical process control (SPC) analysis, trend charting (e.g., using JMP or Minitab), or inclusion in regulatory submissions (e.g., USP , WHO TRS 961 Annex 9). Audit trails—comprising operator ID, parameter changes, and event timestamps—are retained onboard for ≥30 days and exportable for GLP/GMP-compliant review. Firmware updates are performed via secure USB interface with cryptographic signature verification to prevent unauthorized modification.

Applications

• Long-term storage of heat-labile reagents (e.g., restriction enzymes, antibodies, growth factors) at −20°C or −40°C without freeze-thaw degradation.
• Cold-adapted microorganism cultivation (e.g., Pseudomonas fluorescens, Colwellia psychrerythraea) requiring stable sub-zero growth conditions.
• Accelerated stability testing of pharmaceutical formulations per ICH Q5C guidelines, including low-temperature stress studies (2–8°C and −20°C storage conditions).
• Pre-chilling of electrophoresis buffers, chromatography mobile phases, and cell lysis reagents to minimize enzymatic activity during sample preparation.
• Environmental simulation for ecotoxicology assays involving cold-water aquatic species or alpine plant tissue culture.
• Backup cold storage for biobanking workflows where −80°C ultra-low freezers are unavailable or undergoing maintenance.

FAQ

What is the lowest operating temperature achievable across the LRH series?
The LRH-100CB, LRH-150CB, and LRH-250CB models achieve a minimum operating temperature of −40°C, verified per ISO 105-B02 cold chamber calibration procedures.
Is the R134a refrigerant compatible with standard service infrastructure?
Yes—R134a uses common service fittings, pressure gauges, and recovery equipment; no specialized tools or certifications beyond standard EPA Section 608 Type II are required for maintenance.
Can the incubator maintain temperature uniformity with all shelves loaded?
Yes—uniformity of ±1.0°C (at −40°C) and ±0.5°C (at 37°C) is guaranteed under full-load conditions (ASTM E145-22 Class II performance criteria).
Does the unit support 21 CFR Part 11-compliant electronic signatures?
The hardware provides the necessary data integrity infrastructure (audit trail, role-based access, electronic records); full Part 11 compliance requires validation of the connected software platform per your organization’s SOPs.
Are replacement shelves and gaskets available as spare parts?
Yes—stainless-steel shelves (part no. LRH-SH-SS), door gaskets (LRH-GSKT-01), and test port plugs (LRH-TP-PLUG) are stocked and ship globally within 5 business days.