A vertical ultra-low temperature freezer from the BPT Smart Frequency Conversion line — the most advanced in the series —, designed for the long-term storage of viruses, pathogens, red blood cells, white blood cells, skin, bones, bacteria, semen, biological products, electronics, and special materials. Combining a dual independent hydrocarbon (HC) refrigeration system with frequency conversion (inverter) technology — a world-first innovation in the segment —, the BPT line delivers energy consumption below 10 kWh/day, temperature uniformity of ±3°C, and maximum reliability for the most critical specimens, with CE, UL, and ENERGY STAR certification across all models.

The dual independent HC refrigeration system operates with two variable frequency compressors featuring adaptive control that tracks usage patterns and continuously adjusts the refrigeration output to reduce energy consumption without compromising performance. Each system is individually capable of maintaining −86°C — if one compressor fails, the other automatically takes over full operation, with no human intervention required and no risk to stored samples. The innovative control algorithm balances temperature losses against inverter system output, guaranteeing ±3°C stability across the full −40°C to −86°C range.

Energy efficiency is achieved through three complementary innovations: low-GWP HC refrigerant, adaptive frequency conversion, and high-performance insulation with double foaming on both inner and outer doors combined with super-thick VIP thermal insulation technology — improving insulation efficiency by 20% and extending holdover time during power failure events. A five-layer sealing structure with triple gaskets distributed across the main and inner doors further minimizes heat ingress.

The low-noise design achieves 43.5 dB(A) in the DW-86L959BPT model, driven by adaptive fan and compressor control from the inverter system. The intelligent LCD touchscreen displays temperature at 0.1°C resolution, integrates an intelligent sample management system, and covers a full alarm set: high and low temperature, sensor error, hot condenser, power failure, low battery, high ambient temperature, dirty filter, and door ajar. A heated pressure equalization port with spring-assisted mechanism prevents icing and allows rapid main door reopening. Standard interfaces include USB, RS485, and a 5V power supply port; optional CO₂ and LN₂ backup systems are available.

Technical Specifications

Key Features

• World first: the only ULT freezer combining dual HC system + frequency conversion technology

• Dual inverter compressors with adaptive control: automatic adjustment to usage patterns without performance loss

• Dual independent HC system: each maintains −86°C individually with automatic redundancy on failure

• Energy consumption below 10 kWh/day — global benchmark for ULT energy efficiency

• Innovative control algorithm: ±3°C thermal stability across −40°C to −86°C

• Super-thick VIP insulation with double foaming: +20% insulation efficiency and extended power-failure holdover

• 5-layer sealing with triple gaskets between main door and inner doors

• Heated pressure equalization port with spring-assisted mechanism for fast door reopening

• Low noise: down to 43.5 dB(A) on the DW-86L959BPT model

• Intelligent LCD touchscreen with sample management and 9-type alarm system

• Standard USB, RS485, and 5V power supply port; optional CO₂ and LN₂ backup systems

• Unique-key lockable handle + padlock support + optional fingerprint and electromagnetic lock

• CE / UL / ENERGY STAR certified across all four models

Applications

The BPT Smart Frequency Conversion series is designed for blood banks, hospitals, disease control and prevention centers, scientific research institutes, biomedical engineering institutes, agriculture and fishery companies, corporate laboratories, and chemical and electronics industries requiring long-term ultra-low temperature storage with maximum sample security, traceability, and energy efficiency validated by international certifications.

The four models — from 579 L to 959 L —, combined with RS485 network connectivity and optional CO₂/LN₂ backup systems, make the series equally suitable for individual mid-scale laboratories and large-scale operations requiring centralized supervision of multiple units and guaranteed thermal continuity even during extended power outages.