Eppendorf CO2 Back-up System - Manual (Page 31)

Technical data
New Brunswick CO2 Back-up System
English (EN)
31
We highly recommend that the user decide, prior to full operation, what temperature conditions the
back-up unit should maintain. The user should then install the system, switch the freezer off, and record the
time it takes for the gas bottle to empty while the system maintains the desired temperature. This
precaution will enable the user to select the gas bottle size best suited to providing the degree of protection
required. As a guide, the following chart can be used to calculate consumption:
9.8 CO
2
Supplies
Consult your local gas supplier for suitable CO
2
supplies. Do not include a regulator, as liquid withdrawal is
necessary for the satisfactory operation of the system in utilizing the cooling properties of the compressed
CO
2
gas.
The connection on the CO2 bottle should be (a) in Europe, British Standard BS341, No. 8, 0.851 inch 14TPI
Female, (b) in the USA, Type CGA 320.
Consumption in kg/hr
(lbs/hr): at -50 °C at -60 °C at -70 °C
Upright freezers
(empty)
U725 Innova 1.85 (4.07) 2.0 (4.4) 2.35 (5.17)
U535 Innova 1.45 (3.19) 1.57 (3.45) 1.65 (3.63)
U101 Innova 0.8 (1.76) 1.0 (2.2) 1.4 (3.08)
U410 Premium 1.38 (3.03) 1.5 (3.3) 1.6 (3.52)
U570 Premium 1.95 (4.3) 1.6 (3.52) 1.7 (3.74)
Chest freezers (empty)
C760 Innova 1.95 (4.3) 2.6 (5.72) 2.8 (6.16)
C585 Innova 1.7 (3.74) 2.0 (4.4) 2.7 (5.94)
C660 Premium 1.83 (4.0) 2.45 (5.39) 2.65 (5.83)
C340 Premium 1.3 (2.86) 1.45 (5.39) 1.6 (3.52)
NOTICE! Wrong CO
2
bottles
Device will not operate correctly.
 Use liquid CO
2
, NOT gas.
 Use bottles containing liquid CO
2
fitted with full-length dip tubes.