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Chapter 4 Inspection
HIGH FLOW INSUFFLATION UNIT UHI-4
4.7 Inspection of the gas supply and caution for
insufficient gas supply function
When a gas cylinder is connected
1. Confirm that the gas pressure display indicates at least 3 green LED bars.
2. Close the gas cylinder valve and confirm that the supply pressure remains
unchanged.
• The gas pressure display displays not the remaining amount
of CO
2
cylinder but the supply pressure. Always have a CO
2
cylinder available in case the supply pressure drops down.
• If the gas supply pressure indicated by the bar graph
decreases spontaneously while no operation is performed,
there may be a gas leak. Check the connection of the
cylinder hose again. If the supply pressure continues to move
down, stop operating and immediately contact Olympus.
3. Set the insufflation mode to HIGH and press the START switch.
4. Confirm that the bar graph for supply pressure is moving down as the
pressure rate increases and that an alarm sounds when the pressure drops
below 2 LEDs. Also confirm that insufflation stops, the red LED lamp lights
up; and the alarm sounds again when insufflation continues.
5. Press the insufflation switch and open the gas cylinder’s valve.
If the gas flow indicator lights yellow, the gas cylinder valve is
not open or the CO
2
volume in the cylinder is insufficient. If
the alarm continues even if the gas cylinder valve is open,
the CO
2
volume in the cylinder is insufficient. In this case,
replace it with a new cylinder, as described in Section 3.3,
“Connecting a CO
2
cylinder” on page 39. Always have a
spare CO
2
cylinder available.
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