session 8...• digital pressure meter (dpm)2g • oxygen analyzer oxygen concentrators overview...
TRANSCRIPT
Session 8
COVID-19 Preparation for Biomedical Professionals
Oxygen Concentrators: Part 2
Ventilators
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AgendaTime Allotted Topic Presenter
30 minutes Didactic – Oxygen Concentrator Egr. Gunalan Dass
20 minutes Case Study Presentations – Ethiopia
Wendemu Zeyede,
Obsera Bulto, Meba
Hailu, Ashebir
Worku, Dr.
Masreshaw
Demelash
15 minutes Discussion
Oxygen ConcentratorsOxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Nasal Prongs
• Oxygen cannulae are plastic tubes shaped as two
prongs delivering an air/oxygen mixture into the
nasal cavities. This device is connected with an
oxygen administration circuit.
• Cannulae can be designed for low-flow
applications (0–15 L/min range in general) or high
flow (> 15 L/min typically). Oxygen and air/oxygen
mixture compatibility, is per ISO 15001.
• Different sizes: adult, pediatric, neonatal
• Single use
Pressure Swing Absorption
Oxygen concentrators use a material called “molecular sieve” that
absorbs nitrogen from the air.
• More pressure = more nitrogen absorbed
The amount of nitrogen that the molecular sieve can absorb is
dependent on the pressure of the gas.
Air consists of approximately 79% nitrogen and 21% oxygen.
• Two feed valves allow air to enter each of the two sieve beds.
• Two waste valves allow waste to exit each of two sieve beds into the atmosphere.
• One equalization valve allows gas to flow from one sieve bed to the other.
Five solenoid valves control the flow of gas through the device:
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Pressure Swing Absorption (PSA)Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Block Diagram
• Intake filter can be
washed and reused.
Worn filters may need to
be replaced.
Cleaning/replacing the
intake filter should be
done during every single
service.
• Product filter needs to be
replaced every 10,000
hours depending on
manufacture
recommendation.
• Clean inside to prevent
dust build up.
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Air Intake Filter and Product Filter
• Air intake filter:
• Washed and reused during every service.
• Some are single use (work more than 15,000
hours).
• Depends on condition and manufacture
recommendation.
• Product filter is replaced every 10,000 hours.
• Please refer to Hour Counter on the oxygen
concentrator.
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Important Components
• Equalization valve allows gas to flow from one sieve bed to the other and vice versa.
• Control board and power supply
• Sieve tank 1 and 2
• High Pressure Valve:
• 2 feed valves allow air to enter each of two sieve beds.
• 2 waste valves allow waste to exit each of two sieve beds to the atmosphere.
• Some units use only 2 valves: feed and waste are built like a two-way switching valve.
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Sieve Bed
• A sieve bed is the filter inside the oxygen concentrator which
separates out the nitrogen from the oxygen in the air. This filter uses
a material, zeolite, to collect all the nitrogen in the air.
• Typically, a concentrator has two of these sieve beds with one of
them always working to collect nitrogen and the other is removing
extra nitrogen that has already been collected. The two sieve beds
switch jobs every few minutes automatically, in a sustainable,
ongoing process.
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Common Problems
The sieve tanks are filled with zeolite granules, a synthetic aluminium silicate. Zeolite acts as a molecular sieve which binds the nitrogen molecules and lets the smaller oxygen molecules pass.
• Sieve tanks should last at least 20,000 hours, and when regularly maintained even 40,000 hours or more.
• To determine the hours of operation please refer to the hour counter.
• Sieve tanks tend to lose their filter properties over time. High humidity is often the reason.
• Water then condenses inside the filter and clogs the granules. Excessively high system pressure and low oxygen concentration is an indicator for a blocked filter.
• One sieve tank will deliver more oxygen than the others as the control circuit periodically switches between them when testing.
• A clogged sieve which contains water weighs more.
*Note: price for zeolite USD 8/Kg 13
XHP
USD 34/Kg (Lithium based) not included
shipping cost.
Sieve Bed Repours
Replacement Overview:
All gaskets and filters are replaced.
Replace the 8cm O-ring during this
process.
The product filter (bacteria filter) should be
replaced every 10,000 hours of use.
The canisters are refilled with new zeolite
material.
The exterior of the canister is cleaned, and
any old labels are removed.
The repoured sieve beds are pressure
tested at 45 psi then monitored in-use on a
concentrator to ensure no leakage and
high oxygen purity.
Leaks can be so small that oxygen
concentration may not be affected
immediately. Also, the sieve material can
become contaminated gradually.
**Careful leak testing is important.
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Absorption Bed Assembly
(Sieve Tank)Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Brand Size Shape
AIRSEP
40cm Long X
8cm
Diameter
Cylinder
DEVILBISS/
Some China
made
44cm Long X
8cm
Diameter
Cylinder
DEVILBISS
32cm Long X
8cm
Diameter
Cylinder
Sieve Bed Repours and Replacement
1. Open the sieve tank carefully.
2. Remove the zeolite and clean the tank.
3. Replace the old O-ring on both sides with new ones.
4. The canisters are refilled with a new zeolite material.
Each tank needs almost 2.3 kg of new zeolite.
5. Reassemble the sieve tank and confirm that the top
cap and bottom cap are sealed properly with a new
O-ring before doing the pressure leak test.
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Absorption Bed Disassembly(Sieve Tank)
Carefully remove the spring,
moving piston, and barrier paper.
Make sure to not cause any
damage to the barrier paper.
Open the top part of the sieve tank
carefully by removing the nut (use
safety goggles and other PPE).
Secure the nut located at the
bottom cap. Be sure to push
down tightly on the cap to
prevent the spring from moving.
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Absorption Bed Disassembly (Sieve Tank)
Please check all the baffle and
stationary piston are in excellent
condition.
Please check for any damage and replace the O ring on both sides
of the tank.
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Absorption Bed Disassembly (Sieve Tank)
Please remove the old zeolite into a dry container
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Sieve Bed Repours and Replacement
6. Use an air compressor to set at 40 to 45psi check by
using DPM 4 pressure meter the range is in 40 to 45
psi than connect to the bottom part of the cylinder
make sure no leak.
7. Connect DPM 4 on top of the cylinder.
8. Then pressure the cylinder for 20 sec see if the reading
of DPM has to be in the range 40 to 45 psi test for 20
sec see how much the pressure drop from the actual
measurement value tolerance is ± 4.5 psi.
9. Check using oxygen analyzer; a good installation
reading will be somewhere 87% to 95%.
40 to 45 psi compressor air
Connect DPM 4
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Sieve Bed Repours and Replacement
10. Make sure the pressure test is
pass, and after that, please use
Oxygen concentrator to test
oxygen output.
11. Please install the sieve tank back
to oxygen concentrator and
check if the high pressure and
low-pressure circuit inside the
range.
12. Then check the oxygen purity
output is supposed to be in 95 to
87% oxygen depends on the
flow setting on the oxygen
concentrator.
Bottom
Top
Block one side of
this line.
Connect DPM 4 for
pressure test.Connect the 45
psi pressure line.
DPM 4
40 TO 45 PSI
40 TO 45 PSI
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Size & Shape of Sieve Tank:
Brand Size Shape
AIRSEP 40cm Long X 8cm Diameter Cylinder
DEVILBISS/ Some china made 44cm Long X 8cm Diameter Cylinder
DEVILBISS 32cm Long X 8cm Diameter Cylinder
Each sieve tank need about 2.3kg to 2.5kg depends on model and brand.
Test tools required for testing:
• Digital pressure meter (DPM)2G
• Oxygen analyzer
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Pricing for Zeolite or Molecular Sieve
There are a few types of zeolite in the market and this item is not under a
dangerous goods list:
• 13 XHP Molecular sieve is about 8 to 12 USD/Kg
• Lithium based molecular is 34 to 38 USD/kg
• Logistic extra charges
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Overview:
Pressures & Switching Times
Complete cycle: 15 - 18 seconds
Pressure patient outlet: 0.5 bar (8 psi) (>50kPa)
Equalization time: 1 – 2 seconds
Pressure reservoir tank: 1.4 - 2.0 bar (20 - 30 psi) ( <220 kPa)
Half cycle (filtering or flushing): 7 - 8 seconds
Pressure compressor: 1.4 - 2.0 bar (20 - 30 psi) ( <220 kPa)
Pressure relief valve 50 psi at the compressor
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Safety Issues To Consider:
Detrimental Health Effects:
• Only effects are associated with inhaling the
finely ground powdered material in the
area.
Handling Precautions:
• Breathing dust protection should be worn.
Emergency and First Aid Procedures:
• Move to open area with better air
ventilation, resuscitate, if necessary.
Steps for Material Spills:
• No toxic effects. Clean up and recover as
suitable.
Waste Disposal Method:
• Spills on the ground should be cleaned up
in a manner which does not generate dust.
Dispose of in a landfill or distribute thinly
over any suitable cultivable land.
Protective Gloves:
• Not necessary but useful since powder is oil
absorbent and drying.
Eye Protection:
• Safety glasses or goggles are necessary to
prevent dust from entering eyes.
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Common Alarms
SYMPTOM: PROBLEM: SOLUTION:
Alarm:
• Short beeps
• Long pause
• Concentrator not operating,
power switch On.
• Ex. Beep......Beep......
Main Power Loss:
1. Power cord not plugged in.
2. No power at outlet.
3. Tripped circuit breaker.
4. Power compressor is not
working.
1. Insert plug into outlet.
2. Inspect house circuit breakers
or fuses. If problem reoccurs,
use a different outlet.
3. Check the compressor.
4. Unit has run too long, may be
thermal. Turn off to cool down.
Alarm:
• Continuous beep
• Concentrator not operating,
power Switch On.
• Ex. Beeeeeeeep....
System Failure:
1. Unit overheating due to
blocked air intake.
2. Insufficient power at outlet.
3. Internal repairs required.
1. Remove and clean cabinet
filters.
2. Move oxygen concentrator at
least three inches away from
walls, draperies or furniture.
3. DO NOT use extension cords.
Move to another electrical
outlet or circuit.
Alarm:
• Rapid Beep
• Ex. Beep... Beep...Beep
Low Flow Alarm:
1. Kinked or blocked tubing,
cannula or humidifier.
2. Flowmeter set at 0.5 L/min or
less.
1. Inspect for kinks or blockages.
2. Correct, clean or replace item.
3. Once corrected, turn power Off
for 60 seconds and then turn
power back ON.
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Common Alarms
SYMPTOM: PROBLEM CAUSE: SOLUTION:
Alarm: YELLOW or RED light
Illuminated
Alarm: Continuous On RED light
only
1. Low oxygen purity.*
2. Kinked or blocked tubing,
cannula or humidifier.*
3. Flowmeter set at 0.5 L/min or
less.
4. Unit overheating due to
blocked air intake.
* Depends on brand
1. Clean or replace filters.
2. Inspect for kinks or blockages.
Correct, clean or replace item.
Once corrected, turn power Off
for 60 seconds and then turn
power back On.
3. Check flowmeter is set to 1.0
L/min or more.
4. Remove and clean cabinet
filters.
5. Move concentrator at least
three inches from walls,
draperies, and furniture.
Troubleshooting
As always, troubleshooting starts with observing and listening to
the machine.
✓ Complete a function check.
✓ Listen for any abnormal sounds and check the switching times.
✓ If anything sounds abnormal, open the concentrator and have a closer look.
Often the status of the valves is indicated by LEDs which are mounted on
the control board (depending on the model). Certain concentrator models
have ports where you connect a pressure gauge.
✓ Consult the service manual.
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Troubleshooting
The unit runs but a low pressure, low flow, or high-
pressure condition exists.
NOTE– Low pressure or flow are indicated by both a visible and audible alarm. High pressure is indicated
by a “popping” sound caused by the pressure relief valve.
1. Connect test gauges to sieve bed tests points.
2. Refer to the Normal Operating Sequence to make sure the unit is cycling properly.
3. If bed pressure is rising slowly, check for occluded filters and severe leaks.
4. If filters are clean and there are no leaks, then the compressor is defective. If the pressure
relief valve is releasing pressure, observe whether the unit is cycling or not.
5. If the unit is not cycling or has uneven bed pressures, this indicates that the equalization
valve is not operating correctly.
6. If the unit is cycling in conjunction with very high bed pressures, this indicates defective
sieve beds.
Troubleshooting
The compressor will not start when the unit is
turned on.
Verify that the cooling fan is running; if it is not, determine where you are losing power.1
4 If voltage is not present, the wire harness is defective.
2 Check for compressor voltage at the compressor connector.
3 If voltage is present, then the capacitor or compressor is defective.
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Troubleshooting
sieve beds
flow meter
accumulator tank/Product tank
final bacteria filter
pressure regulator
final check valve
outlet port
Apply leak test solution to all fittings and hose
connections with unit running. If an air leak is
present, the solution will bubble. All leaks should be
repaired before putting the unit back in service.
Do not apply leak test solution to any part of the
valve or the main PC Board assembly.
The concentrator runs and continues
to cycle but has low oxygen
concentrations.
Check for oxygen leaks at:
Connect test gauges and check for higher or
lower than normal bed pressures.
a) High pressures indicate defective sieve
beds.
b) Low pressures indicate occluded filters,
leaks, or defective compressor.
c) Uneven bed pressures indicate valve is not
operating correctly.
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Experience Sharing on Oxygen Concentrator Maintenance
Addis Ababa Tegbare-id Polytechnic College
Biomedical Technology Department, 2020
COVID-19 Medical Equipment Maintenance
Maintenance Workflow Chart
FAIL
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
✓ Acceptance
✓ Maintenance
✓ Test & Analysis
✓ Decommissioning
DocumentationOxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Covid-19 Medical Equipment Acceptance Checklist
Addis Ababa Tegbare-id Polytechnic College
Biomedical Technology Department, 2020
Equipment Details
Asset #*: Model:
Hospital Name: Serial number:
Equipment Name: Manufacture:
Accessories
History/ Status
Ow ners information
Name: e-mail:
Signature: Phone #:
Date of arrival:
*Asset #: First tw o letter of hospital (abbreviation of hospital), number of equipment
based on registration
DocumentationOxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
PPE
Disassemble
Cleaning
Disinfection
Air Dry
Decontamination Procedure
(Safety First!)Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Troubleshooting StepsOxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Troubleshooting any system requires
an understanding of:
How it operates?
How it does it?
What it does?
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Always Remember KISS
(Keep It Simple, Stupid)
“When faced with two possible
explanations, the simpler of the
two is the most likely to be true”
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Case Study:
Yuyue Oxygen ConcentratorNote: The error codes discussed in this case study is specific to the Yuyue
oxygen concentrator. Please consult the technical reference manual of your
specific oxygen concentrators for description of error codes.
• Common failure
• Machine stops running after a few hours/minutes
• Low oxygen concentration output
• Oxygen delivery at low pressure/high pressure
• Machine stops running
• Machine runs but no gas output
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Case Study
Case 1: Machine stops running after a few hours/minutes
Problem
• Pressure/O2 concentration sensor senses above or below operating range
• Dust on PCB board or oxygen sensor board and dust particle block air ways
Solution• Clean dust particles and check the output pressure and O2 concentration
E1 or E2 or LO- error message displayed on the screen on some brands
Case Study
Case 2: Low oxygen concentration output
Problem
• Dirty filter and dirt tube
• Cracked or kinked pneumatic tube
• Zeolite expired (20,000hr)
Solution
• Clean filter and tube
• Replace zeolite
• Correct the tube if kinked and change the
tube
L0 (low O2 concentration)- Error message is displayed on the screen in some brands
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Case Study
Case 3a: Oxygen delivery at low pressure
Problem causing low pressure:
• Blocked tube and dirty canister intake
/inlet/gross/ filter
• Leakage
• Pressure regulator adjusted at low level
• Low air compression
Solution
• Check the tube to see if it is blocked
• Clean the filter
• Check the tube for cracks and tighten the
tube if it is loose
• Adjust the pressure to the correct range
E1 (low output pressure )- error message
displayed on screen in some brands
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Case Study
Case 3b: Oxygen delivery at high pressure
Problem causing high pressure
• Narrowed tube diameter due to dust particles
• Pressure regulator adjusted at a high level
Solution
• Clean the dust particles
• Adjust the regulator to normal operating range
E2 (high output pressure)- error message
is displayed on the screen in some brands
Error code E2
Pressure measurement:
96kpa
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Case Study
Case 4: Machine does not function when
switched on
Problem
• Electrical wire disconnections
• Starting capacitor failure
• Compressor failure
• Electrical component failure
Solution
• Check electrical connection
• Check and replace capacitor
• Check motor winding and replace if
necessary
• Check other circuit components such as
transformer, fuse, etc.
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Audible alarm gives sound continuously if
machine is turned on and AC power cord
unplugged.
Case Study
Case 5: No gas output when the
machine is turned on
Problem
• Blocked check valve/failed solenoid coil
• Disconnected tube or leakage
• Blocked HEPA filter/ inlet filter
Solution
• Check solenoid valve and replace if
necessary
• Check disconnected tube/leakage and
tighten the connection
• Clean/replace HEPA/intake/gross filter
E3 (open compressor/open air way)- error
message is displayed on the screen in some
brands
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion
ContributorsGunalan Dass, Assist International
Benjin Joshua, Assist International
Erin Sharkey, Assist International
Dr. Masreshaw Demelash, Assist International
Ashebir Worku, AATPCWendemu Zeyede, AATPC
Obsera Bulto, AATPC
Meba Hailu, AATPC
Oxygen
Concentrators
Overview
Filters,
Cannulae, &
Other
Components
Sieve Bed
Repours &
Replacement
Common
Alarms
Troubleshooting
Maintenance
Case Studies
Discussion