Locator Jr. Plus specifications

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Warnings

The tank uses a vacuum to ensure temperature control, and care must be taken to prevent premature vacuum loss.
Do not tamper with or remove the vacuum port (covered by a black plastic cap on the side of the vessel).
When inserting or removing racks, be careful not to come into contact with the neck tube area of the vessel. Remove them slowly, in a vertical manner. Scratches on the neck tube area can cause premature vacuum failure.
Do not use the tank for transport. Use an intermediate liquid N₂ vessel to move liquid N₂ from the dock to the tank. Cracks in the floor and bumping into objects can disrupt the vacuum. </aside>

Adding liquid N₂ to a warm vessel

Add only a small amount of liquid N₂ (5–10 liters) to the new or warm vessel. Liquid N₂ is available on the first floor on the dock.
Allow this small amount to sit in the covered vessel for at least 2 hours, to let the vessel equilibrate to the temperature change.
Add an additional 15 liters and allow the vessel to sit for 48 hours. Monitor liquid N₂ consumption with a wooden yardstick — never a hollow tube or plastic dipstick.
Fill the vessel no higher than the top of the racks, approximately 12 inches with racks inserted.
Insert and remove racks slowly. Allow the liquid N₂ to run out of boxes and off racks before completely removing them from the Locator.

Maintenance

Monitor the level of liquid N₂ in the tank every 1–2 days to anticipate subtle changes in consumption and prevent problems before they arise. Keep a record of the levels using the tank level log below.
No vacuum will last forever, so have the vessel tested by the manufacturer (Thermo Fisher) or a qualified cryo-vessel service technician every 7–10 years.