Dräger Narkomed 2B - Oxygen Supply Pressure Alarm Switch Adjustment (Earlier Machines)

NM2B ADJUSTMENT AND CALIBRATION PROCEDURES (continued)
5.2 Oxygen Supply Pressure Alarm Switch Adjustment (earlier machines)
5.2.1 Disconnect all pipeline hoses and set the System Power switch to ON.
5.2.2 Close all cylinder valves except the O
2
valve.
5.2.3 Set the oxygen flow to 5 liters per min.
5.2.4 Open the other gas flow control valves to drain pressure from the
system.
5.2.5 Close the O
2
cylinder valve, and close the flow control valves. Press
the O
2
Flush valve to drain oxygen pressure from the system.
5.2.6 Set the System Power switch to STANDBY.
5.2.7 Remove the flowmeter housing rear cover. Remove the table top and
pull the writing or keyboard tray out to its fully extended position.
5.2.8 Locate the TEE fitting in the ¼ in. diameter O
2
regulator output line,
and remove the plug from the TEE fitting.
5.2.9 Connect a dedicated O
2
test gauge to the TEE fitting.
5.2.10 Open the O
2
cylinder valve and set the System Power switch to ON.
5.2.11 Set the oxygen flow to 5 liters per min.
5.2.12 Close the oxygen cylinder valve.
5.2.13 As the pressure drops, the O
2
SUPPLY alarm should activate when
the pressure is between 40 and 34 psi as shown on the test gauge.
5.2.14 If the alarm activates when the pressure is below 34 psi, turn the
adjustment wheel to increase the setpoint (see illustration), repeat
the test and adjust as necessary to bring the set point into the correct
range.
If the alarm activates when the pressure is above 40 psi, turn the
adjustment wheel to decrease the setpoint (see illustration), repeat
the test and adjust as necessary to bring the set point into the correct
range.
5-5
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