Parker Matrx Digital MDM, Installation Manual, Page: 26 / 28

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Adjust mixture dial to 50% oxygen position. Adjust flow control until Oxygen and Nitrous Oxide
flowmeter tubes show approximately 5 LPM each gas.
Without further adjustment of flow control knob and a total of 10 LPM, move mixture dial through
full travel. Total flow must be within ½ LPM of 10 LPM through full travel. (As indicated on
individual flowtubes).
4. Failsafe Test
Turn off and disconnect from wall outlet oxygen gas supply to MDM and observe that nitrous
oxide flowmeter float falls at same rate as oxygen flowmeter float.
5. Oxygen Flush Test
Depress and release oxygen flush button to assure that breathing bag can be inflated.
6. Non-Rebreathing Valve Test
Blow into the breathing tube connector. Exhaled air must not pass through breathing connector.
7. Air Inlet Valve Test
Temporarily plug breathing bag mount and inhale through breathing tube connector. Room air
must enter through air inlet valve. (Remove temporary plug)
Then temporarily plug the breathing tube connector and blow into breathing bag port. Exhaled air
must not escape through air inlet valve. (Remove temporary plug)
OPERATION
A. The Controls and Indicators
1. Mixture Dia l - controls setting of oxygen concentration of gas mixture. Adjustment
of this control does not affect total flow rate. (See fig 32).
2. Flow Control - controls total flow rate of gas mixture. Adjustment of this control does not
affect mixture concentration.
3. Oxygen Flush - when manually pressed, provides rapid inflation of the breathing bag with
oxygen when required.
OPERATION (cont.)
A. The Controls and Indicators (cont.)