Dräger Primus Instructions For Use Manual page 49

SORC (Sensitive Oxygen Ratio Controller)
Primus is fitted with an electronic O2 minimum delivery system
to avoid hypoxic gas mixtures when N20 is selected as carrier
gas. The minimum O2 concentration is limited to 25 % for
fresh-gas flows of more than 0.8 L/min.
For fresh-gas flow settings below 0.8 L/min, the O2
concentration is automatically increased to a value
corresponding to an O2 flow of 200 mL/min. If this control
system is activated, the O2 % value is also highlighted with a
yellow background in addition to the active setting. The
minimum oxygen delivery consequently equals 200 mL/min
when using N20 as carrier gas.
The SORC function is not active when Air is selected as
carrier gas and 100 % Air can be metered throughout the
entire flow range.
Fresh-gas failure detection
— During operation, Primus checks that the piston cylinder
unit has a sufficient level of fresh gas.
If the message "FGAS LOW OR LEAK" appears:
@ increase the fresh-gas flow.
Setting the Vapor
1 Lockthe unused vaporiser = slide lever completely towards
the unused Vapor (example: left-hand Vapor locked).
When the handwheel is set to »T«:
2 Press O key, engage handwheel at 0.
Wait 5 seconds for pressure to balance.
3 Press 0 key and
3 turn handwheel anticlockwise to set the required
anaesthetic gas concentration.
Instructions for Use Primus SW 2.n
Operation
0.2 05 0.8 18.00
. (max.)
Fresh gas flow L/min
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