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The MH EDS O2D1 is equiped with AUDIO-VISUAL ALARMS and ALERTS designed to bring to the user’s
attention potential malfunctions of the unit. Read the following for specifics.
ALARMS AND ALERTS
POWER UP
POWER-UP:
Red Light
flashing on and off with audio chime for ~ two (2) seconds with each initial power-up with pulse of
O
2
for about 1/2 second.
O2 DELIVERY or NON-DELIVERY:
Normally one flash of the LED
Green Light
(~1/4 second minimum) will flash for each
pulse of oxygen with a valid inhalation event with properly connected oxygen lines.
NOTE:
The O2D1
FLOW-FAULT
(see
FLOW-FAULT
below) indicator will not function as an out-of-oxygen warning if the pressure in the oxygen cylinder is 500 psi or
less. There may be pressure in the oxygen line but not enough to activate the Pulse-Demand unit, consequently...no FLOW-FAULT
warning. Prior to flying, using the cylinder chart, the pilot should estimate his flight altitude and time to determine the amount
of oxygen that he or she will need. It is better to have more than your estimated need. If a pilot consistently flies above 18,000
feet, the aircraft should have a supplementary gauge, visible during flight by the pilot, to determine the cylinder oxygen pressure.
You should also carry an EOS (Emergency Oxygen System) such as the MH Co-Pilot as a back-up safety feature in case the other
system stops working. It is the absolute responsibility of the pilot to determine that there is an adequate amount of oxygen
pressure in the oxygen cylinder prior to his flight, as well as an emergency back-up in case of a system failure. The oxygen sys-
tem must be checked and tested
ON THE GROUND
before the flight.
O
2
DELIVERY or NON-DELIVERY
FLOW-FAULT EVENT:
The LED
Red Light
will flash on and off along with a Hi-Lo audio chime for ~ 2 seconds with every
event.
NOTE:
The
FLOW-FAULT
is not intended as a low or out-of-oxygen warning. It is only intended to warn the pilot that
there is no oxygen flowing to the EDS O2D1 unit. This typically means that the cylinder valve was not opened, or the supply
line has been pinched closed, or is plugged up, or has come off, or the valve in the O2D1 has failed to open.
FLOW FAULT EVENT
APNEA EVENT:
Flash
Amber Light
four (4) discrete times with audio beeps once every four (4) seconds until unit detects
a valid inhalation event. Time before Apnea event is ~30 ~35 seconds. This typically occurs for the following reasons:
(1)
The
user has quit breathing for 30 - 45 seconds or the cannula/face mask is improperly worn.
(2)
The outlet tube from the MH EDS-
O2D1 to the mask or cannula has become disconnected.
(3)
The outlet tubing has become pinched closed or is plugged off.
The apnea alarm can be used as a “put-your-oxygen-on” alarm once you get to the preset D mode altitude (D5 or
D10). In this case, the alarm will not sound if you already have the cannula or face mask on properly.
APNEA EVENT
USING THE MH EDS-O2D1 WITH A THIRD-PARTY REGULATOR
LOW BATTERY -1:
Depending on battery condition, one short flash of the
Red Light
once every second,
no sound
. The
unit will continue to operate properly for about four hours @ 77°F (25°C) after the indicator starts to flash. The EDS-O2D1 will
operate for ~ 100 hours with a fresh set of DURACELL ULTRA alkaline batteries under normal operation.
LOW BATTERY-1
(First Warning)
LOW BATTERY -2:
Two short flashes of the
Red Light
once every second,
no sound
. When this alarm occurs, the unit may
operate for about 45 to 60 minutes, then the oxygen flow will stop and may go into the
Bad Battery Mode
.
BATTERIES
SHOULD BE REPLACED IMMEDIATELY.
The EDS-O2D1 will operate for ~ 100 hours with a fresh set of quality alkaline
batteries under normal operation.
LOW BATTERY-2
(Second Warning)
BAD BATTERY:
Flashing
Red Light
on and off at a one (1) second rate with unit locked out, no sound.
BATTERIES
SHOULD BE REPLACED IMMEDIATELY!
BAD BATTERY
If the EDS-O2D1 will not be used with a MH Regulator, the alternate regulator must be able to deliver a
pressure of between 15 and 25 psi (static). If the above listed pressure specifications are not met, the EDS-
O2D2 may not operate correctly.
Lower pressures will result in an inadequate volume of oxygen. Higher pressures will
result in a too high volume of oxygen. Excessively high pressures will cause the valve to open spontaneously and leak oxygen.
To use the MH EDS-O2D1 with a third-party regulator or built-in oxygen system with a pressure higher than 25 psi, it is
mandatory that you use the MH EDS IN-LINE REGULATOR to ensure correct flow pressure. The EDS-ILR goes between the third-
party regulator or built in system and the MH EDS-O2D1 to reduce the flow pressure to an appropriate level.
