Upright Mechanical Cryogenic Freezer (−150°C)

What is the Upright Mechanical Cryogenic Freezer (−150°C)?

An upright mechanical cryogenic freezer reaches about −150°C with cascade or mixed-refrigerant compression and uses inner doors and shelves for box storage. It is the right choice for biobanks and laboratories that want liquid-nitrogen-free storage at vapor-phase temperatures with convenient access.

Overview

This freezer uses a two- or three-stage cascade refrigeration system, or a single compressor with mixed refrigerants, to maintain a chamber setpoint down to −150°C. The cabinet is an upright design with vacuum insulation panels, a thick outer door with a gasket and several inner doors that limit cold loss when opened. Capacities run from 300 to 600 L, holding 20,000–40,000 2 mL vials in standard boxes, in racks or drawers. A microprocessor controller shows chamber temperature, stores alarm histories and communicates with remote monitoring systems. Liquid nitrogen or carbon dioxide backup injection can be added as a safeguard. Pull-down from ambient takes 6 to 10 hours, and recovery after door opening takes several minutes. The unit gives −150°C without nitrogen deliveries but needs power, space for heat rejection and planned maintenance.

How does it work?

Mechanical cryogenic freezers reach −150°C through multi-stage refrigeration. A cascade system links two or three compressor circuits, each with a different refrigerant, so that the evaporator of one stage cools the condenser of the next. Mixed-refrigerant systems use a single compressor with a blend of refrigerants that evaporates across a wide temperature range. Vacuum insulation panels and thick foam limit heat gain, and the chamber uses uniform air circulation or conduction shelves. Controlled-rate freezers follow a different principle, injecting liquid nitrogen or using a cold head to cool the chamber along a programmed ramp, commonly −1°C per minute, with a controller and sensors that follow temperature setpoints. Both types use PT100 sensors, alarms, and backup options such as liquid nitrogen injection or carbon dioxide.

What are the key features?

• Cascade or mixed-refrigerant compression reaches setpoints down to −150°C.
• Multiple inner doors limit cold loss during box retrieval.
• Vacuum insulation panels reduce heat gain and energy use.
• Controller with alarm history and remote monitoring output.
• Optional liquid nitrogen or carbon dioxide backup injection system.
• Racks and drawers accept standard 2-inch cryoboxes.

What are the technical specifications?

A typical upright mechanical cryogenic freezer (−150°c) configuration offers temperature range of −100°C to −150°C, capacity of 300–600 L, storage (2 mL vials) of 20,000–40,000 vials, temperature uniformity of ±5°C, pull-down time of 6–10 h from ambient and refrigeration system of Cascade or mixed refrigerant. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Upright Mechanical Cryogenic Freezer (−150°C) is used in biobank vapor-phase equivalent storage, cell bank working stocks, backup to liquid nitrogen vessels and tissue sample storage. Across the wider Cryogenic Freezers class, laboratories also deploy it for biobank sample storage without liquid nitrogen, cell line and primary cell storage and controlled-rate freezing of cell therapy products.

Which standards and certifications apply?

Relevant standards and methods include IEC 61010-1, IEC 61010-2-011, ISO 20387, ISO 21009-1, EN 61326-1 and GB 4793.1. Certification candidates for this model are CE, ISO 9001 manufacturing and IEC 61010-1; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Mechanical cryogenic freezers release substantial heat, often 1–3 kW, so allow at least 20–30 cm of clearance and adequate room cooling. Use a dedicated circuit with a stable supply and consider a UPS or a backup generator, as well as a liquid nitrogen or carbon dioxide backup injection system. Keep the ambient temperature below about 32°C. Limit door opening time and avoid loading warm samples in bulk. Clean the condenser filter every one to three months. Calibrate temperature sensors at least annually, test the alarms and log temperature continuously. Controlled-rate freezers need a clean liquid nitrogen supply, exhaust ventilation and oxygen monitoring. Plan service access and preventive maintenance contracts.

How do I select the right Upright Mechanical Cryogenic Freezer (−150°C)?

Select an upright mechanical cryogenic freezer when you want −150°C storage without nitrogen logistics and can supply stable power and cooling. For −196°C storage, a liquid nitrogen system is required. In an RFQ, specify capacity, rack format, target temperature at full load and ambient, alarm outputs and backup injection.

How does it compare with other Cryogenic Freezers variants?

Decide first between storage and freezing. For storage, compare mechanical freezers at −135°C to −150°C and liquid nitrogen vessels, weighing the benefit of no nitrogen supply against dependence on electricity. Check that the stated temperature is achieved at full load and at your room temperature, not only when empty. Size capacity in boxes or vials and examine the shelf or rack format. Compare power consumption, heat rejection to the room, noise, recovery time after door opening and alarm and backup options. For controlled freezing, confirm rate range, number of programmable steps, sample holding format and whether liquid nitrogen supply is acceptable. For regulated work, add data logging, password control and calibration support.