Operation; Measuring Liquid Nitrogen Quantity - Thermo Scientific BioCane CK50900 Betriebshandbuch

Section 3

Operation

Measuring Liquid
Nitrogen Quantity
3-2 Cryobiological Storage Vessel
1. Use a wooden yardstick to measure liquid nitrogen level. Never use a
hollow tube or plastic dipstick to measure liquid nitrogen level.
2. Level will be indicated by frost line which develops when dipstick is
removed and waved in a back and forth motion away from the user.
Thermo Scientific