Two controlled rate freezers. Both in stock. A $500 price difference. The Thermo Fisher CryoMed 7452 and the Integra GDKYRO 750 Plus Krysave both run cooling curves and inject LN2 to hit them, but the curve each serves isn’t the same. Of course, it’s the freezing curve that determines what survives the thaw. Rush the phase change and ice crystals shred cell membranes. Hold the rate where it’s supposed to be and viability holds, too.
Today we’ll examine the four criteria that separate these two units, then offer a straightforward recommendation for the lab you’re running.
What a Controlled Rate Freezer Does & When You Need One
A controlled rate freezer, or cryopreservation LN2 freezer, programs a cooling curve, typically around 1°C per minute through the phase change, and uses LN2 injection to hold that rate against the sample’s own heat of fusion. Passive cooling, a foam or isopropanol container, gets an approximate rate for a handful of vials. A controlled rate freezer gets a documented, repeatable curve, the standard regulated and clinical work requires.
Skip said rate control and here’s the failure mode that follows: Ice crystals form between cells, osmotic stress sets in, and viability takes a hit at thaw. These units are designed to freeze, not to store. Once a sample hits its target temperature, it moves to a cryogenic freezer or an LN2 dewar. A cryogenic freezer‘s job starts where a controlled rate freezer’s ends.
The Two Units at a Glance
Here’s how the two automated rate controlled freezers compare on specs:
Thermo Fisher CryoMed 7452, $2,995
- Chamber volume: 34L (1.2 cu ft)
- Temperature range: +50°C to -180°C
- Format: front loading
- Cooling rate: 0.1°C/min to 99.9°C/min, programmable
- Warming rate: 0.1°C/min to 12.0°C/min, programmable
- Cooling method: LN2 injection with dual solenoid valves
- Interface: integrated control panel, backlit LCD, chamber and sample temperatures
- External dimensions: 37.7″W x 21.2″H x 20.4″D | Power: 120V 60Hz
Integra GDKYRO 750 Plus Krysave, $3,495
- Chamber volume: 29L
- Temperature range: +40°C to -160°C
- Format: front loading
- Capacity: 1,452 x 2mL vials/ampoules, 20 x 1000mL blood bags, or 1,216 x 2mL straws
- Cooling rate: -0.1°C to -10°C/min, programmable
- Heating rate: 0.1°C to 10°C/min, programmable
- Cooling method: LN2 injection with forced laminar flow
- Interface: two-button panel or remote PC control
- Door seals: heated, prevents freeze-shut at cryogenic temperatures
- Chamber: removable inner chamber for sterilization
- External dimensions: 21.6″W x 29.9″H x 21.6″D | Power: 115V 50/60Hz
Footprint is also a differentiator between the two units. The CryoMed is wide and low, built for bench space. The Integra is tall and narrow, built for floor space.
Capacity & Load Format
When it comes to capacity, 34L versus 29L is close enough that raw volume isn’t the deciding factor. What matters is what the racking holds and how it’s counted.
The Integra publishes its capacity three ways: vials, blood bags, and straws. That tells you the product was engineered for blood banking, biobanking, and reproductive tissue work, not just standard cryovial runs in the broader refrigeration and freezer category.
We recommend counting your biggest single run, then checking it against each format:
- Standard cryovials only? Both units handle it.
- Blood bags or straws in the mix? The Integra publishes a format for each.
- Mixed sample types across departments? The GDKYRO’s published capacity gives a documented answer instead of a guess.
Cooling Profile Control
The standard target is 1°C per minute through the phase change, but few protocols run exactly that. Stem cells, primary cells, and blood products each want their own curve, and the freezer needs to deliver it without drifting.
Both of the models we’re comparing are automated rate controlled freezers that inject LN2 on a program rather than a valve a technician babysits. The CryoMed programs a cooling rate from 0.1°C/min to 99.9°C/min and a warming rate up to 12.0°C/min, a range that covers nearly any protocol. The Integra publishes -0.1°C to -10°C/min cooling plus programmable heating for seeding steps, a useful differentiator for mid-curve control.
With both units programming a profile, the comparison becomes about how it’s stored. The CryoMed runs from its own control panel. The Integra adds remote PC control, so a run can be logged and filed without a technician standing at the unit. Either cryopreservation LN2 freezer will document a curve that will easily pass an audit.
Chamber Design, Sterilization & Seals
The Integra’s two standout features pay off daily: Heated door seals stop the freeze-shut problem at cryogenic temperatures, and a removable inner chamber simplifies cleaning between sample types, no small thing for GMP or clinical work.
The CryoMed controlled rate freezer earns its own applause line: solid build quality and Thermo’s parts and service network, which matters once a used unit is a few years into service.
Control Interface & Data Capture
The CryoMed’s backlit LCD shows chamber and sample temperature at the unit, good for a shared bench. The Integra’s two-button interface plus remote PC control suits labs that want run-data pulled and filed for QA. Ask which one your workflow needs: a simple local readout or logged output.
Which One Fits Your Lab
The CryoMed controlled rate freezer suits academic and R&D labs, cell line banking, moderate vial throughput, and budget-conscious buyers who want a proven platform with wide parts availability. On a single-instrument purchase, the $500 saved is real money.
The GDKYRO 750 Plus suits blood products, clinical and biobanking work, mixed sample formats, and any lab running under a quality system that needs profiles documented, not just run (the kind of call the BaneBio team walks labs through daily).
If your protocol is one curve and one format, the CryoMed does the job. If it’s several of either, the Integra earns the difference in cost.
What to Check Before Buying Used
A used lab freezer is a different purchase than buying new, so be sure to check the following first:
- Solenoid valve condition and LN2 line wear
- Chamber and probe calibration records
- LN2 supply and line compatibility with your setup
- Door seal integrity after repeated freeze-thaw cycles
- Availability of the original profile documentation
If you’re weighing a trade-in, BaneBio also buys used lab equipment outright. Every unit is inspected before listing, ships with a 14-day money back guarantee, and can include delivery, installation, and a preventative maintenance plan.
Making the Right Call
Pick by workflow first, price second.
One curve on standard cryovials, and the CryoMed 7452 is the proven, budget-friendly controlled rate freezer for the job. Mixed formats, clinical samples, or documented profiles under a quality system, and the GDKYRO 750 Plus earns its $500 premium.
Both units are single-quantity in stock right now, real reason to move rather than wait on used lab freezer inventory that won’t be there for long. Contact BaneBio to talk through the fit, or go straight to the CryoMed 7452 and GDKYRO 750 Plus product pages.