Specification builder · Tier B
Ultra-low temperature (ULT) freezer, -86 C to -50 C, upright, chest or compact, for laboratory sample storage
An ultra-low temperature freezer keeps biological samples, nucleic acids, plasma, cell material, reference standards and sensitive reagents at about -80 C for years. Buyers are university and research labs, biobanks, hospital molecular and virology labs, blood banks and pharma QC labs. In Pakistan the key choices are the rated room temperature (most models are rated only to 32 C), power protection against load-shedding and voltage swings, and a remote alarm that reaches someone at night.
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Standards this specification draws on
- IEC 61010-1:2010+AMD1:2016 Basic electrical, mechanical and fire safety for laboratory equipment; the legal safety baseline for any lab freezer.
- IEC 61010-2-011:2019 Particular safety requirements for laboratory refrigerating equipment, including flammable-refrigerant and pressure hazards in -80 C freezers.
- IEC 61326-1:2020 Electromagnetic compatibility (EMC) of laboratory equipment, so controllers and alarms are not disturbed by, or disturbing, nearby equipment.
- ISO 5149-1:2014 / EN 378-1:2016+A1:2020 Safety and environmental requirements for refrigerating systems, including charge limits and design for flammable refrigerants.
- ENERGY STAR Laboratory Grade Refrigerators and Freezers, Version 2.0 (2024) US EPA test method and energy limits for ULT freezers, the common basis for comparing measured kWh/day.
- WHO PQS E003/ULT01.1 (2020) WHO performance specification for ultra-low temperature freezers, defining hot-zone (+43 C), moderate and temperate ambient test conditions, alarms and refrigerant GWP limits.
- WHO TRS 961 Annex 9, Supplement 8: Temperature mapping of storage areas WHO guidance on how to map and qualify temperature-controlled storage, used for IQ/OQ/PQ of the freezer.
- ISO 20387:2018 Biobanking requirements, including controlled and monitored storage conditions for biological material.
- 21 CFR Part 11 / EU GMP Annex 11 Requirements for trustworthy electronic temperature records, audit trails and signatures in GMP environments.
- ISO 9001:2015 / ISO 13485:2016 Quality management system of the manufacturer.
- DRAP Medical Devices Rules 2017 Lab freezers are normally not medical devices in Pakistan; the rules apply only if a model is offered as a medical device for clinical blood-component storage.
Common mistakes in tenders for this equipment
- Copying one maker's exact figures (for example 'pull-down in 215 minutes or less', exactly 728 L or a fixed number of inner doors) so that only one brand qualifies; use ranges and 'not less than / not more than'.
- Asking for 'non-flammable' refrigerants while also asking for natural hydrocarbons; this is contradictory, excludes nearly all current energy-efficient models and lets older high-GWP HFC designs in.
- Ignoring the rated ambient temperature: a 32 C-rated freezer placed in a non-air-conditioned room in a 40-45 C summer runs hot, alarms, and suffers early compressor failure.
- Buying the freezer without racks and boxes: racks are often priced separately (10-25% of the cost), and the stated box capacity cannot be used without them.
- No remote alarm path: relying on the built-in buzzer in a locked lab, so an overnight or weekend failure is found only after samples have thawed.
- No voltage stabiliser, earthing or backup power planned, then warranty claims for burnt compressors and controllers are rejected because of supply faults.
- Accepting a 'compressor-only' long warranty in place of a comprehensive warranty, and not checking that a trained engineer for hydrocarbon refrigerant systems exists in Pakistan.
- Comparing energy use or uniformity figures measured at different set points (-70 C vs -80 C) or ambient conditions; ask for values at -80 C with the test conditions stated.