So-Low Ultra Low Upright Freezers

Category Upright Lab Freezers
Manufacturer So-Low
Country of manufacture the United States of America

Upright style Ultra-Low Temperature Freezers are designed for a variety of uses including shrink fitting, and ultra cold storage of product at -85°C. The upright freezer style allows for easy access and storage. Freezer Sizes range from 13 to 30 cubic feet capacities.

Manufactured in Cincinnati Ohio, So-Low Ultra-Low -85°C freezers are produced with high quality craftsmanship, heavy-duty materials, and over 50 years of experience. These freezers use a cascade refrigeration system, providing reliable and durable environmental conditions for your product’s vital temperature requirements. So-Low Ultra-Low freezers are available in wide variety of sizes and styles, to accommodate for each customers required conditions. Combined with our nation-wide service network, our Ultra-Low Freezers have various options for additional temperature recording devices, providing the highest level of quality temperature transcription.

So-Low's Superior Construction

Ultra low freezers have a 16-ga. exterior (cold rolled steel). Interiors are 14 gauge vs. competitions 16 gauge. Ultra low freezer interiors are galvanized, non-corrosive steel. Galvanized steel conducts temperature more efficiently than stainless steel. This creates less stress on compressors making them run cooler and longer.

So-Low's Digital Control

So-Low is the only ultra low temperature manufacturer to utilize a dual display digital temperature control. A red LED display indicates the actual interior chamber temperature while a green LED display located directly below the red display shows the actual setpoint temperature. This will give assurance that the freezer is operating at the correct temperature range whereas other manufacturer's temperature controls show only the actual temperature and not both the setpoint and actual temperature.

So-Low's Dependability

Laboratory professionals all over the world have recognized the dependability and efficiency of So-Low Ultra Low Freezers, the first to combine all of these performance features and deliver a level of quality construction, reliability and value unequaled anywhere in the world. Performance testing is your assurance of So-Low Ultra low freezers' dependability. Every freezer is fully tested under the most demanding conditions for seven days. The constant ultra-low setpoint operation temperature is assured in warm temperature environments. Dependability is backed up by a 12 month warranty. Technical assistance is provided by a Nation-Wide-Network of service companies.

Please note: So-Low Ultra Low Freezers are manufactured at the time the order is placed and go through extensive testing before they are released. A 4-6 week lead time should be expected.

Some of the accessories/options available for this product are factory installed and must be purchased at the same time your So-Low freezer / refrigerator is ordered. Please add them to your cart with your freezer / refrigerator before checkout so that they may be included with the submission of your order to the manufacturer for installation during production.

Key Attributes
Min. Temperature -40°C to -85°C
Cubic Feet 13 to 31
Alarms Yes
Controls Digital
Defrost Unavailable
Electrical 115/60/1 - 208/60/1 - 230/60/1
Warranty (years) 1
Weight (lb) 725 to 1050
Width (in) 36 to 59.5
Depth (in) 36.25
Height (in) 79.5
Manufacturer Specifications
. PV85-13 PV85-18 PV85-22 PV85-25 PV80-28 PV80-30

Temp Range:

 -40°C to -85°C

 -40°C to -80°C


13 Cu ft / 370L

18 Cu Ft / 505L

22 Cu ft / 626L

25 Cu ft / 710L

28 Cu ft / 792L

31 Cu ft / 877L


 4 Shelves (5 Compartments)

Rack Capacity:







w x d x h

35'' x 34.5'' x 79.5''

40'' x 36'' x 79.5''

43'' x 37'' x 79.25''

50'' x 37'' x 79.5''

54'' x 37'' x 79.5''

60.5'' x 37'' x 79.5''

w x d x h

20'' x 22'' x 51.25''

23'' x 26'' x 51.25''

28.5'' x 26'' x 51.25''

34'' x 25'' x 51.25''

38'' x 25'' x 51''

42'' x 25'' x 51.25''

Weight (lbs): 725 775 850 950 1000 1050
Temperature Control Digital Control with two temperature displays. One display shows the set temperature, the other shows the actual temperature in the freezer.
Alarm System Battery operated alarm system will emit an audible and visual signal when there is a mechanical or electrical failure. The alarm has an over and under temperature setting, alarm silencing feature, and battery test feature. 
Remote Alarm Relay A relay for a remote alarm hook-up is also provided. 
Refrigeration System So-Low cascade type. Two hermetic compressors. CFC & HCFC free refrigerants.
Construction Chamber is 14-ga. zinc coated galvanized steel. Exterior is 16-ga. steel. Powder coated cool gray finish.
Voltages Available 115/60/1 - 208/60/1 - 230/60/1 - 220/50/1
Technical Support Supplied by Nation-Wide-Network of service companies.

What side does the door open from?

The door opens from the left side (the hinge is on the right), as in the picture below. If you need it the other way around, please inquire about having the door customized.

Are the So-Low Ultra Low Upright Freezers UL listed?

No, but they are ETL listed, which is a legally equivalent marking from a different organization. Just like UL listing, ETL listing serves as proof of product compliance to North American safety standards in both the US and Canada.


What is the weight capacity of each shelf?

75 pounds.


Do the So-Low Ultra Low Upright Freezers have a lock?

The latch of the freezer is lockable with a padlock. They do not have a built-in keyed lock.


What insulation is used and how much is there?

The insulation is a 5 inch thick polyurethane foam.


What is the life expectancy of one of the So-Low Ultra Low Upright Freezers?

If a freezer kicks the bucket, it's probably because the compressor went. So this is really a matter of how long the life of the compressor is. The manufacturer of these compressors puts them through a stress test which simulates, in an accelerated fashion by means of having additional load on it, 8 years of normal wear. According to this test, a So-Low ULT should last at least 8 years.

However, there are situations where you can decrease the life of your compressor. Most of these involve additional stress on the compressor, for instance:

  • Opening and closing the door frequently
  • Having the unit in a hot and / or dirty environment
  • Not cleaning the area around the compressor and allowing dust to build up on the components
  • Not replacing worn door gaskets, if necessary

So under heavy load, in a harsh environment or under conditions of poor maintenance, your ULT might not last as long. This would be true for any freezer.


What refrigerants are used in the So-Low Ultra Low Upright Freezers?

R-404A, R-508B, and R-170.


Are these refrigerants acceptable under the EPA's Significant New Alternatives Policy (SNAP)?

Yes, they all are listed as acceptable under the EPA's Substitutes in Very Low Temperature Refrigeration.


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