Upright Plasma Storage Freezer

What is the Upright Plasma Storage Freezer?

An upright plasma storage freezer is a floor-standing cabinet that holds frozen plasma at –30 °C to –40 °C on shelves or in drawers. It suits blood banks and hospitals that need accessible storage of fresh frozen plasma with alarms and continuous recording.

Overview

Upright freezers use a vertical airflow design with shelves or drawers for easy access to labeled bags. Capacities of 200 to 700 L hold roughly 100 to 350 plasma units in cartons or racks. The chamber is foamed with high-density polyurethane, and the door has a heated gasket and a lock. A microprocessor holds the set point, commonly –30 °C, and an independent alarm probe triggers high and low alerts. Drawers limit cold loss during access and assist stock rotation by expiry date. Because cold air can fall out when the door opens, units often include an inner door or a fast-recovery compressor. Upright format suits stock checks and medium capacity, although chest freezers hold cold better during outages.

How does it work?

Plasma freezers use a compressor refrigeration circuit, often a single-stage system with low-temperature refrigerant for –40 °C models and a cascade system for –80 °C models. Air circulates past plates or shelves to extract heat, and heavy polyurethane insulation limits gain. Quality depends on how fast plasma passes through its freezing range: coagulation factors such as Factor VIII are better preserved when the core reaches –30 °C within about one hour, so rapid freezers use high airflow or contact plates. A controller reads an RTD probe, often in a glycol buffer, and drives independent alarms and a recorder. Door gaskets with heaters prevent icing, and condenser fans and a backup CO2 or LN2 option can protect stock during power loss.

What are the key features?

• Holds –30 °C to –40 °C with microprocessor control
• Drawers or shelves for labeled bag access and expiry rotation
• Independent alarm probe and audible/visual alarms
• Heated door gasket and lockable door
• Battery-backed alarms and sensor-fault detection
• Chart or electronic recorder with network output

What are the technical specifications?

A typical upright plasma storage freezer configuration offers temperature range of –25 °C to –40 °C, net capacity of 200–700 L, plasma unit capacity of approx. 100–350 units (250 mL), uniformity of ≤ ±3 °C, pull-down time of approx. 4–6 h to –30 °C (empty) and refrigerant of R290 or R404A (region dependent). 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 Plasma Storage Freezer is used in fresh frozen plasma storage, cryoprecipitate holding, hospital transfusion services and regional blood banks. Across the wider Plasma Freezers class, laboratories also deploy it for fresh frozen plasma storage, cryoprecipitate storage and plasma for fractionation.

Which standards and certifications apply?

Relevant standards and methods include Council of Europe Guide to the Preparation, Use and Quality Assurance of Blood Components, AABB Standards for Blood Banks and Transfusion Services, IEC 61010-2-011, IEC 61010-1, IEC 61326-1 and ISO 13485. Certification candidates for this model are CE, ISO 13485 and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Install the freezer on a level floor with clear ventilation and a dedicated circuit. Run it empty until stable and map temperature before loading. Handle frozen plasma carefully to avoid bag cracks, and store in overwrap or cartons. Calibrate probes at least annually, test alarms regularly, and defrost or clean according to the maker's schedule to control frost. Keep records for the regulatory period and maintain a contingency plan that names a validated alternate freezer or dry-ice supply. Do not load large warm volumes at once, since this raises the chamber temperature and stresses the compressor.

How do I select the right Upright Plasma Storage Freezer?

Select upright format for medium stock with frequent retrieval and inventory checks. Specify capacity in units, drawer or shelf layout, set point, alarm outputs and recorder, plus pull-down data at your ambient temperature. Choose a chest freezer where longer hold-over during outages or lower cost per liter is the priority.

How does it compare with other Plasma Freezers variants?

Decide first whether you need freezing, storage or both. Blast models freeze plasma quickly and are usually followed by storage units. For storage, choose the temperature by the shelf life your regulator allows: storage at –25 °C or colder is commonly accepted for up to 36 months in European guidance, while –65 °C or colder extends shelf life under some standards. Then pick upright or chest format by floor space and access frequency, capacity in bags or liters, and monitoring needs. Check the recovery time after door opening, noise, ambient class and whether a CO2 or LN2 backup port is offered. Plan for electrical supply and heat load in the room.