Dräger Narkomed 2B - Page 155

NM2B ADJUSTMENT AND CALIBRATION PROCEDURES (continued)
5.4.15 The oxygen concentration should be between 21% and 29% oxygen.
* 5.4.16 If the yellow O
2
/N
2
O FLOW RATIO lamp on the alarm panel is lighted,
proceed to step 5.4.20.
* 5.4.17 If the yellow O
2
/N
2
O FLOW RATIO lamp on the alarm panel is not
lighted, loosen setscrew H and turn the switch adjustment cam until
it is pointing downward.
* 5.4.18 Loosen setscrew A and move the switch mount until it is nearly
touching the switch adjustment cam. Tighten setscrew A.
* 5.4.19 Turn the switch adjustment cam clockwise until the contacts close
and the O
2
/N
2
O FLOW RATIO lamp is lighted. Tighten setscrew H.
* 5.4.20 Close the N
2
O flow control valve.
* 5.4.21 Adjust the oxygen flow to 1 liter per minute.
* 5.4.22 Slowly open the N
2
O flow control valve.
* 5.4.23 The yellow O
2
/N
2
O FLOW RATIO lamp on the alarm panel should
light as soon as the ORMC limits the flow of nitrous oxide.
* 5.4.24 Adjust the oxygen flow to 1.5 liters per minute.
* 5.4.25 Slowly open the N
2
O flow control valve.
* 5.4.26 The yellow O
2
/N
2
O FLOW RATIO lamp on the alarm panel should
light as soon as the ORMC limits the flow of nitrous oxide.
5.4.27 Adjust the oxygen flow to 2 liters per minute.
5.4.28 Slowly open the N
2
O flow control valve.
* 5.4.29 The yellow O
2
/N
2
O FLOW RATIO lamp on the alarm panel should
light as soon as the ORMC limits the flow of nitrous oxide.
5.4.30 Close the oxygen flow control valve. The nitrous oxide flow should
decrease proportionally, and the oxygen concentration should remain
between 21% and 29% oxygen.
5-13
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