GE S5 Owners Manual

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Document no. M1187338-003
11. Remove the CO2 unit module bus flex cable from the REC board.
NOTE: Be careful with the in sulation plate covering the 
cable connector on the REC board.
12. Lift the CO2 unit carefully up and remove the unit  from the module cover.
13. Remove the screw (T8) holding the module bus flex  cable to recorder unit metal plate and module 
cover.
14. Lift the REC board carefully up and disconnect the  two module bus flex cables from the REC board. 
Remove the REC board with the recorder unit 
metal plate from the module cover.
15. Remove the four pozidrive screws holding the REC  board to the recorder unit metal plate. 
						

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16. Use a flat blade screwdriver to unlock the module bus connector insulator cover. Put the screwdriver 
in the hole and move the blade backwards (away 
from the module bus flex cable) until the insulator 
cover unlocks.
17. By assisting with a screwdriver pull the module bus  connector through the hole in the module cover.
18. Flip the module cover over and remove the two (T6)  screws holding the lock un it to the frame. While 
pulling the tab push the lo ckers with a screwdriver 
to remove the lock unit. 
						

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3.4 Adjustments and calibrations
3.4.1 Calibrating
The airway module should be calibrated once every six months or whenever there are 
indications of errors in the gas readings. 
Calibrate the gas measurement with the Datex-Ohmeda calibration gas. Do not use any other 
calibration gases. 
−Use the regulator 755534-HEL.
− Use gas 755580 only and set the FiO2 le vel in the CO2 setup menu to 21-40% Airway Gas 
- CO2 setup. .O
2 concentration to 20%.   
Use only recommended calibration gases to guarantee a successful calibration.
During gas calibration, % units are always used for CO
2 regardless of selected measuring units.
NOTE: Ensure that the calibration gas and regulator are functioning properly before calibration. 
Perform the annual maintenance on the regulator as required.
Figure 8 Attaching regulato r to the calibration can
1. Attach the regulator to the gas container.
2. Attach a new sampling line to the water trap. Connect the loose end of the sampling line 
to the regulator on the gas container. 
						

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Figure 9 Connecting sampling line to the gas valve and feeding gas
3. For maximum accuracy, let the monitor  warm up for 30 minutes. The menu item Gas 
calibration remains gray as long as the message  ‘Calibrating gas sensor’ is displayed. 
4. Press the 
Airway Gas key and select  Gas calibration .
5. Wait until the ‘Zero ok’ and then the ‘Feed gas’ messages appear after each gas on the  screen.
6. Open the regulator and feed calibration gas until the message ‘Adjust’ appears, then  close the valve.
7. Check that the displayed gas value matches the value on the calibration gas container. 
NOTE: Adjust the O
2 percentage according to the calibration  gas (for 755580 the right O2 value 
is 20%).  
NOTE: If an error occurs during calibration or if  no gas is fed, the text ‘Calibr. error’ appears. 
Push the ComWheel to perform a new calibration.
If adjustments are required:
•Turn the ComWheel to highlight the first gas to be adjusted and then push the ComWheel.
Airway Gas 
						

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Document no. M1187338-003
•Turn the ComWheel until the displayed value matches the desired value in the gas bottle 
and push it again.
If the message ‘Zero error’ is displayed, press the 
Normal Screen key and repeat the 
calibration procedure.
The time of the last calibration is shown at the bottom of the menu page. 
3.4.2 Gas sampling system adjustment
For flow rate measurements, a flow meter with a low flow resistance  and the capability to 
measure low flow rates is required. A sampling line of no rmal length has to be connected to the 
monitor as it has a considerable effect on the flow.
3.4.3 Flow rate measurement
If any flow rates are not correct, first replac e the Mini D-Fend water trap, then recheck the 
flows.
The sampling flow rate is measured by a flow meter at the sampling line. The flow rate should 
be between 135 and 165 ml/min. The flow rate is adjusted in the  Gases service menu with 
Sample gain adj .
3.4.4 Flow rate adjustment
NOTE: Before adjusting the sampling flow, make sure there is no leakage in the sampling 
system. 
Refer to chapter  3.2 Service check,  step 13. Gas calibration .
Wait until the Sample Flow value is back to near 150 ml/min.
Connect a flow meter to the 3 meter sampling line and check that the flow (the flow meter 
reading) is within  the following range:
Sampling flow (ml/min) 135...165
If necessary, readjust the sampling flow:
Select Sample gain adj  from the menu. 
To increase the sampling flow, turn  the ComWheel counterclockwise. 
To decrease the flow, turn the ComWheel clockwise. 
						

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A change of 0.050 in the Gain value changes the flow approximately 7.5 ml/min.
After you have changed the gain, wait until the Sample Flow value on the screen returns near 
to the original, then check the flow meter reading again.
3.4.5 Gas calibration
Gas calibration is performed in the  Airway Gas menu. 
Calibration gas regulator flow check
Interval: every 12 months
Regulator flow specification:
REF 755583-HEL & 755534-HEL: 260 – 410 ml /min at 1-10 bar cylinder pressure
REF 755530-HEL: 260 – 410ml/min  at 5-7psi cylinder pressure
Tools needed: calibration gas ca n, regulator, piece of silicon hose and flow meter. GE 
Healthcare recommends use of TSI 4140 Flow Meter.
Insert the calibration gas regu lator on the gas cylinder. Connect a silicon hose between the 
regulator and the flow meter. Block the regulato r overflow port and open the regulator. Check 
the flow rate from the flow meter and verify  that the flow is within the specification. 
						

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4Troubleshooting
4.1 Troubleshooting chart for recorder unit
4.2 Troubleshooting chart for CO
2 measurement
Problem CauseWhat to do
Module not responding to front panel 
key, but operates through Recorder 
menu. Membrane switch cable loose or 
broken.
Check the cable. Replace the 
front panel if necessary.
Recorder will not start.
No error messages shown. Recorder: Module not properly 
inserted.Re-insert the module properly.
Recorder: Flex-strip cable broken. Check the cable. Replace if  necessary.
Recorder board faulty. Replace the recorder board.
Recorder unit faulty. Replace the recorder unit.
Recorder works but nothing appears 
on the paper. Active side of the paper downwards. Turn the paper roll over.
To test which side is active: 
Place the paper on a hard 
surface and draw a line with a 
fingernail - a dark line will 
appear on the active (thermal) 
side.
Recorder unit faulty. Replace the recorder unit.
Problem Cause/What to do
No response to breathing Sampling line or water trap blocked or loose, or improperly attached. Water trap container full.
See the gas sampling system troubleshooting.
‘SENSOR INOP.’ message The temperature is too low or high, check the temperature in the service  menu. Supply voltage is too low or high, IR source current or voltage is 
too low or high, check current in the service menu.
Pump is not working properly, check sample flow and pump voltage in 
the service menu.
Ambient pressure too low or high, check the ambient pressure in the 
service menu.
Zero valve not working properly, check the functionality by switching 
zero valve on and off in the service menu. 
‘ZEROING ERROR’ message Gas zeroing failed. Condensation or residual gases are affecting the zero  measurement. Allow the module to run  drawing room air for half an hour 
and calibrate again.
‘CHECK D-FEND’ message
 Amb – Work pressure difference too small.
Probably water trap or the sampling line is not attached properly. Gas 
zero valve failure. Pump failure or gas outlet blockage. 
						

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4.2.1 CO2 measurement
‘REPLACE D-FEND’ message Amb – Work pressure difference too big.Indicates residue build-up on the water trap membrane. This decreases 
air flow. Replace the D-fend.
‘SAMPLE LINE BLOCKED’ message Amb – Work pressure difference too big. Sampling line or water trap is occluded. Water trap container is full. If 
occlusion persists, check internal tubing for blockages.
No response to any gas Check Sample Gas Out. Amb - Work pressure low, flow too small and pump voltage too high.
Sampling line, water trap, or internal tubing is blocked or loose, or 
improperly attached. Gas out connector or tubing is blocked.
Zero valve malfunction. Pump failure or pump is worn. Supply voltage 
missing. Serial communication error.
Sudden increase in gas display Water trap malfunction. Check all internal tubing and the interior of the  water trap for occlusions or leaks. Replace water trap. Check flow rates.
Abnormally high (or abnormally 
low response to CO
2
or sudden occlusion warning Pressure transducer failure. Check the Ambient and Amb – Work 
pressures in 
Gases service menu.
Strong drift in all gases Leak in  sampling line or internal tubing (especially in conjunction with too 
low readings).
Problem Cause What to do
Action
too low ETCO
2 value
•sudden decrease in circulation
•pulmonary embolism
•hyperventilation
•very large dead-space
•large shunting
•leak in sampling system
•calibration error
•high by-pass flow from ventilator
•check all connections
•check calibration
too high ETCO
2•hypoventilation
•increased metabolism
•D-fend contaminated
•calibration error
•change D-fend
•check calibration
waveform clipped
•incorrect scaling•change scale
Problem Cause/What to do 
						

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4.3 Gas sampling system troubleshooting
The faults which can occur in the sampling system are: leaks or blockages in the tubing, failure 
of the sampling pump or the magnetic valves, or diminishing of the flow rates because of dirt 
accumulating in the internal tubing.
The following checks should help in localizing the fault. Whenever suspecting the sampling 
system and always after having done any work on the sampling system, check and if 
necessary adjust the flow rate.
CAUTION The special internal sa mple tube is mechanically fragile. Sharp bends will cause 
leaks.
NOTE: D-fend water trap should be replaced, when the ‘REPLACE D-FEND’ message appears 
during the monitor startup.
NOTE: If any liquid has entered the miniC measuring unit due to water trap filter failure, leave 
the module running without a sa mpling line for several hours and check the functions after it 
has dried out. 
4.3.1 Sampling system leak test
1. Connect a flow cassette with a high flow  resistance value (50/1.1) to the end of the 
sampling line and start following the ‘Amb-Wor k’ value in the service menu. When the 
value exceeds 130 mmHg, connect the other port  of the flow cassette to the sample gas 
out connector and switch off the pump.
2. Wait until the pressu re inside the sampling system is  stabilized, then observe the shown 
Amb-Work value. The value, i.e. the pressure inside the sampling system, should not drop 
more than 6 mmHg in 20 seconds.
3. If the pressure drops more, first ensure the connections you have made and repeat the  test.
no response to breathing
•apnea
•(disconnection)
•sampling line or water trap loose or 
blocked (air leak)
•check all connections
•sample gas outlet blocked•check that outlet is open
ETCO
2 over scale >20% 
Shown until 32%, 
specified range 0...20%•abnormally high ETCO2 (permissive 
hypercapnia)
•CO2 sensor contaminated
•D-fend malfunction
•let the module run without a 
sampling line until the CO
2 
sensor has dried out
•change D-fend
ETCO
2>PaCO2•unit is mmHg or kPa and ETCO2 is close 
to arterial PCO
2
•“dry gas” as default
•change to “wet gas” by using 
install/service menu
Problem Cause What to do 
						

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4.4 MiniC unit troubleshooting
WARNINGThe miniC measuring unit  can only be repaired and calibrated at the 
factory. Attempts to repair/calibrate  the unit elsewhere will adversely 
affect operation of the unit. In case  of failure, the complete miniC unit 
should be sent to GE Heal thcare for factory exchange.
4.5 Error messages
Message Explanation
Occlusion or Sample Line Blocked The sample tube inside or outside the monitor is blocked or water  trap is occluded. If occlusion persists, measured gas values 
disappear. 
Continuous occlusion. Check 
sample line and D-fend. Occlusion over 40 seconds.
Check D-fend - The water trap is not connected
- There is a leak in the sampling line inside the module. If air leak 
persists, measured gas values disappear.
Check sample gas out.
(Air leak detected.) Check water 
trap and sample gas out-flow. 
Press normal screen to continue.  Air leak over 40 seconds.
Replace D-fend (replace water 
trap) Indicates residue build-up on the water trap membrane. This 
decreases air flow.
Gas calibration is not available 
during first 5 minutes/during 
occlusion/during air leak Entering calibration is not allowe
d during 5 minutes after power up 
and during occlusion or air leak.
Gas out blocked - Gas out connector on the front panel, or the exhaust line 
connected to it, is blocked.
- If the sample gas is returned to th e patient circuit, the filter in the 
return kit may be occluded.
- Make sure the sample gas outlet is connected to an open 
scavenging system only where gas is removed in room pressure.
Recalibration Time out, fluctuating gases, gain adjusted “over”.
Zero error Unsuccessful zeroing.
Unstable, Calibr error Unsuccessful calibration.
Menu messages during 
calibration :
Zero error Unsuccessful zeroing.
Adjust Calibration gas accepted and monitor is ready for adjusting the gas 
values to match the calibration gas concentration.
Unstable Unsuccessful calibration.