Service, maintenance & care
of the EDS unit model A
With the exception of the electromechanical valve,
mechanically operated switches and buttons, there
are no parts or sensors inside the EDS that will
age, cure or become out of tolerance in time and
use. Therefore, EDS unit does not require any
regular or periodical maintenance or calibration.
If the unit is used in an application where dirt and dust are
present, the electromechanical valve may become clogged
with debris that may cause the flow to decrease or not allow it
to shut off completely. If this happens you can usually remedy
the problem by back-flushing the valve. This is done by
supplying a small amount of air or oxygen pressure into the
large (6mm) outlet line while the electromechanical valve is
held in the full open state.
To clear a clogged valve follow these steps:
1
Remove the 6mm blue union from the outlet side of the
EDS unit.
2
Connect one end of the 4 mm tubing to the outlet of an
XCR regulator connected to an oxygen cylinder with at
least 50 psi of pressure and the other end into a 6mm to
4mm reducing union connected to the outlet of the EDS
unit to be flushed (purged)
If a reducing union is not available, connection can be
done by pressing (sliding) the 4mm tubing into the inside
diameter of the 6mm outlet tube on the EDS unit.
3
With the EDS unit on and the battery test button
depressed turn on the cylinder valve slowly to allow gas
to flow backwards through the EDS unit for about 10
seconds. Then turn off the cylinder valve with the battery
test button still depressed.
If the above steps do not correct the described problem, the
EDS unit is not functioning correctly or if you would like it
checked our for calibration you can send it to Mtn. high E&S
co for diagnosis and repair.
While not being used the EDS unit should be stored in a secure
manner to ensure that dirt and debris do not enter and become
lodged in the inlet and outlet tubes.
The battery should be removed from the EDS unit if it is to be
stored for an extended period of time.
The electromechanical valve has a service life of well over
150 million pulsing cycles. The respiration sensor has a
service life of well over 500 million pulsing cycles. At this
time the valve and sensor may need replacing.
Press battery test
button while pressure
is being applied to
outlet tube to clear
debris inside valve
Battery
test
button
6mm to 4mm
reducing union
Outlet
Inlet
EDS unit
XCR
regulator
Air or
oxygen
source
CAUTION
If the back-flush purging will not be done with an XCR
regulator do not apply pressures over 35 psig into the outlet
of the EDS without the battery test button being pressed, for
this may cause the breathing sensor to rupture.
