LN2 Back-up System

BS-II is to ensure optimal security for critical samples stored in cryogenic freezers. It controls injection of LN2 into freezer when freezer temperature rises above the preset temperature value.

LN2 Back-up System


· Compact design, small footprint, can be placed on freezer top       

· Temperature display, setting temperature adjustable by user 

· USA-made ASCO brand cryogenic electromagnetic valve    


Safety & Protection

· Valve test button to check whether electromagnetic valve works normally

· High/Low temperature alarm, low battery alarm

· Stop injection of LN2 when door opens, protecting user from being injured by liquid LN2 (need to be connected with ULT freezer door switch).



· Stainless steel construction, rust-free, easy cleaning;

· Hose & injection tube with sponge cover for insulation

· Rechargeable battery for 48 hours working time. 

BasicClimate ClassN/ST/T
Cooling TypeDirect Cooling
PerformanceCooling Performance (°C)-99
Temperature Range (°C)-60~-99
Temperature Increment (°C)1
ElectricalPower SupplyAC 100~240V, 50/60Hz
Power (W)20
Electrical Current (A)0.25
Net/Gross Weight11.2/13.6kg
Exterior Dimension (W*D*H)200*400*160 (mm)
         7.8*15.7*6.3 (in)
Packing Dimension (W*D*H)370*530*330 (mm)
        14.6*20.9*13 (in)
FunctionHigh/Low Temperature AlarmYes
Low Liquid CO2 AlarmYes
Low Battery AlarmYes
Sensor Failure AlarmYes
Main Power Failure AlarmYes
Valve Open Indicator LightYes
Main Power On Indicator LightYes
Valve Test ButtonYes
AccessoriesHose (connecting backup system & CO2 cylinder)3 meter
Injection Tube (connecting backup system & freezer)2 meter

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