Portable Liquid Nitrogen Tank: The Field Companion for Artificial Insemination Vets
Short answer: A portable liquid nitrogen tank is a small, lightweight LN2 dewar built to carry frozen semen straws to farms, paddocks, and remote AI sites. Our ST 3 model holds 3 liters, keeps samples at -196°C for up to 26 days, and stores up to 1,788 doses of 0.25 ml straws — everything an artificial insemination veterinarian needs for a full working day outside the lab, plus an optional transport case for secure vehicle travel.
Artificial insemination does not happen in the laboratory. It happens in cattle sheds, on open pasture, at smallholder farms and in the middle of nowhere. The frozen semen straws must stay at -196°C from the moment they leave the liquid nitrogen tank at the AI center until the moment they are thawed at the cow's side. Any temperature rise in between silently damages sperm — and you will not see the loss until conception rates drop months later.
That is why the tool in your vehicle matters as much as the semen itself.
Why Every AI Veterinarian Needs a Portable Liquid Nitrogen Tank
Professional AI work is mobile work. A veterinarian may service several farms in one day, each requiring a different set of straws. Lugging a bulky stationary storage dewar is impossible; leaving straws in a cooling box without liquid nitrogen is a guaranteed quality disaster.
A portable liquid nitrogen tank solves this completely:
Maintains -196°C in the field: the same cryogenic safety as a lab tank, in a carry-ready format
Protects sperm viability during travel: stable temperature means consistent post-thaw motility and reliable conception results
Enables multi-farm routes: carry enough straws for a full day of appointments without returning to base
Reduces handling errors: straws stay organized and protected from the moment they are loaded
For the modern AI veterinarian, a portable liquid nitrogen tank is not an accessory — it is core equipment.
ST 3 Portable Liquid Nitrogen Tank: Specifications at a Glance
The ST 3 is our 3-liter portable liquid nitrogen tank, engineered for short-term storage and transport of frozen semen to breeding farms:
Parameter | Value |
Liquid nitrogen capacity | 3 L |
Neck opening | 50 mm |
Number of canisters | 6 |
Canister size | 38 mm diameter × 120 mm height |
Outer diameter | 223 mm |
Overall height | 445 mm |
Empty weight | 3.1 kg |
Static evaporation | 0.12 L/day |
Static hold time | 26 days |
0.25 ml straw capacity | 1,788 doses |
0.5 ml straw capacity | 792 doses |
At only 3.1 kg empty, the ST 3 fits easily into any service vehicle and can be carried by hand across a farmyard.
Field-Friendly Features of This Portable Liquid Nitrogen Tank
Lockable cover and protective jacket for safe transport
The ST 3 comes with a lockable cover and a protective jacket. Your straws stay secure during road transport, and the lock prevents unauthorized access — important when valuable genetics are on board. The protective jacket guards the aluminum body against bumps, scratches, and handling wear.
Numbered canisters for clean sample organization
Six canisters, each with a clear number printed on top. Sires, breeds, collection dates, and clients can be assigned to a fixed canister number, so there is no guesswork when you need a specific straw in a hurry. Each canister is precision-built, so the canisters glide in and out without tangling.
One-hand operation for busy AI work
When you are holding a straw holder in one hand and an AI gun in the other, the tank must cooperate. The ST 3 is designed so a single operator can open the lid and lift a canister with one hand — no fumbling, no drops, no wasted seconds at the cow's side.
Optional transport case: keep your portable liquid nitrogen tank stable on the road
We can supply a dedicated transport case for the ST 3. The tank sits securely inside the case, so when you place it in your vehicle for transport, it stays stable and does not tip over — even on rough farm roads and sudden braking. This extra layer of protection keeps both the tank and your valuable semen samples safe from the lab to the farm gate.
How to Carry and Use a Portable Liquid Nitrogen Tank in the Field
Pre-charge before the trip: fill the tank with liquid nitrogen the night before and let it settle; top up in the morning before loading straws.
Load straws quickly: transfer straws from the storage dewar into the numbered canisters with minimal time above the neck to avoid frost build-up.
Secure the tank in the vehicle: place the tank inside the optional transport case, position it on a flat, stable surface, and use the lockable cover during transport.
At each farm: open the lid, lift the correct canister by its number, remove the straw you need, and immediately return the canister to the cold zone.
Monitor hold time: with 26 days of static hold time, the ST 3 covers long field rotations, but check the level and refill periodically.
FAQ
How long can the portable liquid nitrogen tank hold liquid nitrogen?
The ST 3 offers a static hold time of up to 26 days, with a static evaporation rate of only 0.12 liters per day.
How many semen straws can the tank store?
Up to 1,788 doses of 0.25 ml straws, or 792 doses of 0.5 ml straws, across six canisters.
Is the portable liquid nitrogen tank safe to transport in a vehicle?
Yes. The lockable cover, protective jacket, and optional transport case make it safe and convenient for vehicle transport — the transport case keeps the tank stable and prevents tipping during the drive.
Can I store both 0.25 ml and 0.5 ml straws?
Yes. The six canisters (38 mm × 120 mm) accept standard 0.25 ml and 0.5 ml frozen semen straws.
Is a transport case available for the ST 3?
Yes. A dedicated transport case is available. It holds the tank securely in place during vehicle transport, preventing tipping and protecting your tank and semen samples on the road.
What makes this tank suitable for a single AI veterinarian?
The 3.1 kg empty weight, one-hand canister operation, and numbered organization system let one person manage the entire field workflow.
Conclusion: Keep Your Semen Safe from Lab to Cow
The quality of your artificial insemination results is decided long before the straw is thawed — it is decided by how the semen travels to the farm. A portable liquid nitrogen tank keeps your frozen semen at -196°C through every bump, every farm gate, and every minute of your working day.
The ST 3 portable liquid nitrogen tank combines a compact 3-liter capacity, 26-day hold time, lockable cover, protective jacket, six numbered canisters and an optional transport case — a complete field solution for AI veterinarians, breeding technicians and mobile AI services.
Explore our full range of liquid nitrogen equipment and semen processing tools. For technical guidance, a detailed datasheet, or bulk pricing, contact us:
Email: heyilabs@gmail.com
WhatsApp: +86-15236623992
Website: www.heyilabs.com
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