Table of Contents
Advertisement
®
7.4
Check of types of gas and test of the safety
devices
7.4.1
Execution of the Test
7.4.2
Proportioning Valves
© F. Stephan GmbH
(Nitrous oxide blocking and O
Apparatus in operating mode
Suction system for anaesthetic gas connected
Spindles of all proportioning valves opened to 3 l/min
Change-over-switch for AIR/N
Separate angular plug for O
The flow of oxygen must decrease continuously
The O
-failure alarm sounds, when line pressure reaches approximately
2
2,8 bar
When pressure further decreases to approximately 2 bar, the nitrous-
oxide-blocking must set in and lower the N
oxygen flow, until, with the system completely emptied, both volume
flows have decreased to zero.
Oxygen supply is restored by inserting the angular O
When the N
O-supply is interrupted, only the N
2
After restoring of the nitrous-oxide-supply, finally change over to AIR
and separate this gas from the supply pipe line. Here as well the flow of
N
O must drop to zero.
2
When the proportioning valves are closed, the respective floats of the
corresponding flowmeter tubes must move back to the zero position. If
this is not the case, a leakage of the respective spindle exists, which must
be eliminated by the service technician.
When carrying out this test, do not forget to change over from N
AIR!
SA-103-0109V1.3-HAO-GB
-failure-alarm)
2
O in N
O-position
2
2
from supply system
2
O flow in parallel to the
2
O-flow drops to zero
2
7
Performance Test
-plug.
2
O to
2
25
Advertisement
Table of Contents
