Datex-Ohmeda S-5 Service Manual S5 Compact

Datex-Ohmeda Compact Airway modules

S/5TM Compact Airway Module, M-CAiOVX (rev. 01)

S/5

Compact Airway Module, M-CAiOV (rev. 03)

Compact Airway Module, M-CAiO (rev. 02)

Compact Airway Module, M-COVX (rev. 02)

S/5

Compact Airway Module, M-COV (rev. 03)

Compact Airway Module, M-CO (rev. 02)

S/5

Compact Airway Module, M-C (rev. 02)

Technical Reference Manual Slot

Datex-Ohmeda Inc. 3030 Ohmeda Drive 53707-7550 MADISON, WIS USA Tel. +1-608-221 1551, Fax +1-608-222 9147

www.us.datex-ohmeda.com

All specifications are subject to change without notice.

Document No. 800 1009-1

June 2001

Datex-Ohmeda Division,

Instrumentarium Corp.

P.O. Box 900, FIN-00031

DATEX-OHMEDA, FINLAND

Tel. +358 10 394 11 Fax +358 9 146 3310

www.datex-ohmeda.com

TABLE OF CONTENTS

S/5 Compact Airway Modules

TABLE OF CONTENTS I

TABLE OF FIGURES III

INTRODUCTION 1

1 SPECIFICATIONS 2

1.1 General specifications ..............................................................................................................................2

1.2 Typical performance .................................................................................................................................2

1.2.1 CO

1.2.2 O

1.2.3 N

1.2.4 Respiration Rate (RR) .......................................................................................................................3

1.2.5 Anesthetic Agents (AA)......................................................................................................................3

1.2.6 MAC ................................................................................................................................................3

1.3 Gas specifications ....................................................................................................................................3

1.3.1 Normal conditions............................................................................................................................4

1.3.2 Conditions exceeding normal............................................................................................................4

1.4 Patient spirometry specifications...............................................................................................................5

1.4.1 Normal conditions............................................................................................................................5

1.4.2 Conditions exceeding normal............................................................................................................6

1.5 Gas exchange specifications .....................................................................................................................7

1.5.1 VO

1.5.2 RQ...................................................................................................................................................7

..................................................................................................................................................2

....................................................................................................................................................2

O .................................................................................................................................................2

and VCO2...................................................................................................................................7

2 FUNCTIONAL DESCRIPTION 8

2.1 Measurement principle .............................................................................................................................8

2.1.1 CO

2.1.2 O

, N2O, and agent measurement ...................................................................................................8

measurement ............................................................................................................................10

2.1.3 Patient spirometry ..........................................................................................................................10

2.1.4 Gas exchange measurement...........................................................................................................12

2.2 Main components...................................................................................................................................13

2.2.1 Gas sampling system......................................................................................................................13

2.2.2 TPX measuring unit.........................................................................................................................17

2.2.3 OM measuring unit .........................................................................................................................17

2.2.4 PVX measuring unit.........................................................................................................................18

2.2.5 Gas exchange ................................................................................................................................19

2.2.6 CPU board .....................................................................................................................................19

2.2.7 OM board.......................................................................................................................................20

2.2.8 PVX board ......................................................................................................................................20

2.3 Connectors and signals...........................................................................................................................21

3 SERVICE PROCEDURES 22

3.1 General service information.....................................................................................................................22

3.1.1 OM measuring unit .........................................................................................................................22

3.1.2 TPX measuring unit.........................................................................................................................22

3.1.3 OM, TPX, and PVX measuring unit....................................................................................................22

Document No. 800 1009-1

Datex-Ohmeda S/5 monitors

3.1.4 Serviceable or exchangeable parts..................................................................................................22

3.2 Service check.........................................................................................................................................23

3.2.1 Recommended tools......................................................................................................................23

3.2.2 Recommended parts......................................................................................................................23

3.3 Disassembly and reassembly..................................................................................................................31

3.3.1 PVX unit.........................................................................................................................................31

3.3.2 Pump unit......................................................................................................................................31

3.3.3 CPU board .....................................................................................................................................31

3.3.4 Software of CPU board ...................................................................................................................32

3.3.5 Instructions after replacing software or CPU board ...........................................................................32

3.4 Adjustments and calibrations..................................................................................................................32

3.4.1 Gas sampling system adjustment ...................................................................................................32

3.4.2 Flow rate measurement..................................................................................................................32

3.4.3 Flow rate adjustment......................................................................................................................33

3.4.4 Gas calibration...............................................................................................................................33

3.4.5 Flow calibration..............................................................................................................................33

4 TROUBLESHOOTING 34

4.1 Troubleshooting charts ...........................................................................................................................34

4.1.1 CO

4.1.2 Patient spirometry..........................................................................................................................36

4.1.3 Gas exchange ................................................................................................................................38

4.2 Gas sampling system troubleshooting .....................................................................................................39

4.2.1 Sampling system leak test..............................................................................................................39

4.2.2 Steam test for the Nafion

4.3 OM measuring unit troubleshooting.........................................................................................................40

4.4 TPX measuring unit troubleshooting.........................................................................................................40

4.5 PVX measuring unit troubleshooting ........................................................................................................40

4.6 CPU board troubleshooting .....................................................................................................................40

4.7 Error messages.......................................................................................................................................41

measurement..........................................................................................................................35

tubes....................................................................................................39

5SERVICE MENU 42

5.1 General menu ........................................................................................................................................43

5.2 Gases service menu ...............................................................................................................................44

5.3 Spirometry service menu ........................................................................................................................46

6 SPARE PARTS 48

6.1 Spare parts list.......................................................................................................................................48

6.1.1 M-C rev. 00, M-CO rev. 00, M-CAiO rev. 00, M-COV rev. 01, M-CAiOV rev. 01, M-COVX rev. 00 ..........48

6.1.2 M-CAiOVX rev. 00, M-CAiOV rev. 02, M-CAiO rev. 01, M-COVX rev. 01, M-COV rev. 02, M-CO rev. 01, M-

C rev. 01..................................................................................................................................................49

6.1.3 S/5 M-CAiOVX rev. 01, S/5 M-CAiOV rev. 03, S/5 M-CAiO rev. 02, S/5 M-COVX rev. 02, S/5 M-COV

rev. 03, S/5 M-CO rev. 02, S/5 M-C rev. 02 ..............................................................................................49

6.1.4 Front panel stickers........................................................................................................................49

6.1.5 S/5 stickers...................................................................................................................................50

6.1.6 Planned Maintenance (PM) Kits: .....................................................................................................51

7 EARLIER REVISIONS 52

APPENDIX A 53

SERVICE CHECK FORM A-1

Document No. 800 1009-1

Table of contents

TABLE OF FIGURES

Figure 1 TPX sensor principle..............................................................................................................................8

Figure 2 Absorbance of N

O and CO2..................................................................................................................9

Figure 3 Infrared absorbance of AAs ...................................................................................................................9

Figure 4 O

measurement principle ..................................................................................................................10

Figure 5 Absorber ............................................................................................................................................14

Figure 6 Gas sampling system layout, M-C........................................................................................................15

Figure 7 Gas sampling system layout, M-CAiOV, M-CAiOVX, M-CAiO, M-COVX, M-COV, M-CO..............................16

Figure 8 Gas tubing layout ...............................................................................................................................16

Figure 9 TPX measuring unit .............................................................................................................................17

Figure 10 OM measuring unit .........................................................................................................................18

Figure 11 PVX measuring unit.........................................................................................................................18

Figure 12 Signal processing...........................................................................................................................19

Figure 13 Control logic...................................................................................................................................20

Figure 14 Calibration data stored in EEPROM..................................................................................................20

Figure 15 Module bus connector pin layout ....................................................................................................21

Figure 16 Pneumatic unit and reference gas connection block.........................................................................25

Document No. 800 1009-1

iii

Datex-Ohmeda S/5 monitors

Document No. 800 1009-1

INTRODUCTION

This section provides information for maintenance and service of the S/5 Compact Airway modules. The Compact Airway modules are double width plug-in modules. M-C, M-CO, M-COV, MCOVX, M-CAiO, M-CAiOV, M-CAiOVX and M-CAiOVX/SERVICE are designed for use with the S/5 monitors. The modules provide airway and respiratory measurements.

Letters in the module name stand for: M = plug-in module, C = CO A = anesthetic agents, and i = agent identification

About M-CAiOVX/SERVICE module

The M-CAiOVX/SERVICE module is meant for service purposes only. It can be used as a loan module if the module in the hospital should be sent to the factory for repair. The specifications that apply to the M-CAiOVX apply also to the M-CAiOVX/SERVICE module. Module differences: the colour of the front mask is green, the front panel has a “SERVICE” text and there are no front panel keys equipped.

Table 1 Options for Compact Airway modules

Compact Airway modules

and N2O, O = patient O2, V = patient spirometry, X = gas exchange,

Modules Parameters/measurements

M-CAiOV M-CAiO M-CAiO M-CO M-COV M-CO M-C M-CAiOVX/SERVICE

• • • • • • •

••• • • •

• • • • •

••• •

• • • • •

•••

• •

••• • • • •

N2OO2Anesthetic

NOTE: Do not use identical modules in the same monitor simultaneously. The M-C, M-CO, M-COV, M-COVX, M-CAiO, M-CAiOV, M-CAiOVX and M-CAiOVX/SERVICE are considered identical modules.

NOTE: The Compact Airway Module and Airway Module, G-XXXX, cannot be used simultaneously in the same monitor.

NOTE: The Compact Airway modules cannot be used in the Extension Frame, F-EXT4.

NOTE: Anesthetic agents and N

O values are not displayed with Critical Care main software, but

when present in the module they are calculated for compensation of CO

agents

Agent ID Spirometry Gas

exchange

and O2.

Document No. 800 1009-1

Datex-Ohmeda S/5 monitors

1 SPECIFICATIONS

1.1 General specifications

Module size, W × D × H 75 × 228 × 112 mm, 2.9 × 9.0 × 4.4 in Module weight 1.6 kg/3.7 lbs Operating temperature +10...+40 °C Storage temperature -25...+70 °C Atmospheric pressure 666...1060 hPa /

Humidity 10...95 % non-condensing (in airway 0...100 %, condensing) Power consumption 12.6 W Prms, 14.6 W momentary

Protection against electrical shock

(67...106 kPa) (500...800 mmHg) (666...1060 mbar)

Type BF

1.2 Typical performance

1.2.1 CO

1.2.2 O

1.2.3 N2O

Measurement range 0...15 vol% (0...15 kPa, 0...113 mmHg) Measurement rise time < 400 ms typical Accuracy ±(0.2 vol% +2 % of reading) Gas cross effects < 0.2 vol% (O

concentration is below 0.1%, 0.0% is displayed.

If CO

Measurement range 0 to 100 vol% Measurement rise time < 400 ms typically Accuracy ±(1 vol% +2% of reading) Gas cross effects < 1 vol%; anesthetic agents

Fi-Et difference resolution 0.1 vol%

Measurement range 0 to 100 %; N2O Measurement rise time < 450 ms typically Accuracy ±(2 vol% +2% of reading) Gas cross effects < 2 vol%; anesthetic agents

< 2 vol%; N

, N2O, anesthetic agents)

Document No. 800 1009-1

1.2.4 Respiration Rate (RR)

Measurement range 4...60 breaths/min Detection criteria 1 % variation in CO

1.2.5 Anesthetic Agents (AA)

Measuring range Hal, Enf, Iso 0 to 6 vol% Sev 0 to 8 vol% Des 0 to 20 vol%

Measurement rise time < 400 ms typically Accuracy ±(0.15 vol% +5% of reading) Gas cross effects < 0.15 vol% N

Resolution is two digits when the AA concentration is below 1.0 vol%. If AA concentration is below 0.1 vol%, 0.0% is displayed.

Identification threshold 0.15 vol% typically Identification time < 20 s (for pure agents)

Compact Airway modules

Mixture identification threshold for 2. agent:

1.2.6 MAC

Range 0...9.9 MAC

Equation:

%(ETAA)

=MAC(AA)

x(AA)

where x(AA): Hal=0.75 %, Enf=1.7 %, Iso=1.15 %, Sev=2.05 %, Des=6.0 %.

1.3 Gas specifications

Airway humidity 0...100 %, condensing Sampling rate 200 ±20 ml/min. (sampling line 2-3 m, normal conditions) Sampling delay 2.5 seconds typical with a 3 m sampling line Total system response time 2.9 seconds typical with a 3 m sampling line, including sampling

Display update rate breath-by-breath

Automatic compensation for pressure, CO

0.2 vol% +10% of total conc.

OETN

Formula 1

100

delay and rise time

O and CO2-O2 collision broadening effect.

2-N2

Warm up time 2 min. for operation with CO

, O2, and N2O

5 min. for operation of anesthetic agents 30 min. for full specifications

Autozeroing interval Immediately after ‘calibrating gas sensor’ and 2, 5, 10, 15, 30, 45,

60 minutes after start-up, then every 60 minutes

Document No. 800 1009-1

Datex-Ohmeda S/5 monitors

1.3.1 Normal conditions

Accuracy specifications apply in normal conditions (after 30 minutes warm-up period): Ambient temperature 18...28 °C, within ±5 °C of calibration Ambient pressure 500...800 mmHg, ±50 mmHg of cal. Ambient humidity 20...80 % RH, ±20 % RH of cal.

Non-disturbing gases

− Ethanol C

− Acetone (< 0.1%)

− Methane CH

− Nitrogen N

− Carbon monoxide CO

− Nitric Oxide NO (< 200 ppm)

− water vapor

Maximum effect on readings

− CO

− O

− anesthetic agents < 0.15 vol%

Effect of Helium decreases CO

OH(< 0.3%)

2H5

(< 0.2%)

< 0.2 vol%

, N2O < 2 vol%

readings < 0.6 vol% typically

1.3.2 Conditions exceeding normal

Accuracy specifications under the following conditions; :

 Ambient temperature 10...40 °C, within ±5 °C of calibration

Ambient pressure 500...800 mmHg, ±50 mmHg of calibration Ambient humidity 10...98 % RH, ±20 % RH of calibration

 During warm-up 2 to 10 minutes (anesthetic agents 5-10 minutes), under normal conditions

 During warm-up 10 to 30 minutes, under normal conditions

N2O

Agents: Hal, Enf, Iso, Sev, Des

Accuracy under different conditions (see above)

Condition  and  Condition 

±(0.3 vol% + 4 % of reading) (at 5 vol% error ±0.5 vol%)

±(0.4 vol% + 7 % of reading) (at 5 vol% error ±0.75 vol%)

±(2 vol% + 2% of reading) ±(3 vol% + 3% of reading)

±(3 vol% + 3% of reading) ±(3 vol% + 5% of reading)

±(0.2 vol% + 10% of reading) ±(0.3 vol% + 10% of reading)

Document No. 800 1009-1

1.4 Patient spirometry specifications

1.4.1 Normal conditions

Accuracy specifications apply in normal conditions (after 10 minutes warm-up period):

Ambient temperature 10...40 °C Ambient pressure 500...800 mmHg Ambient humidity 10...98 %RH Airway humidity 10...100 %RH Respiration rate 4...35 breaths/min (adults)

4...50 breaths/min (pediatric) I:E ratio 1:4.5...2:1 Intubation tube 5.5...10 mm (adults), 3...6 mm (pediatric)

Compact Airway modules

Airway pressures (Paw, P

Measurement range -20...+100 cmH2O Resolution 0.5 cmH Accuracy ±1 cmH

Airway flow

Measurement range 1.5...100 l/min (adults) (for both directions) 0.25...25 l/min (pediatric)

Tidal volume

Measurement range 150...2000 ml (adults), 15...300 ml (pediatric) Resolution 1 ml Accuracy ±6 % or 30 ml (adult), ±6 % or 4 ml (pediatric)

Minute volume

Measurement range 2...20 l/min (adults), 0.5...5 l/min (pediatric) Resolution 0.1 l/min

peak

, P

, PEEPe, PEEP

plat

iStat

, PEEP

iDyn

, P

mean

)

Compliance

Measurement range 4...100 ml/cmH2O (adult), 1...100 ml/cmH2O (pediatric) Resolution 1 ml/cmH

Airway resistance

Measurement range 0...40 cmH2O/ l/s Resolution 1 cmH

O (adult), 0.1 ml/cmH2O (pediatric)

O/ l/s

Document No. 800 1009-1

Datex-Ohmeda S/5 monitors

Other parameters

Specifications apply in conditions listed in patient spirometry specifications.

Dead space of the sensor

9.5 ml (adult), 2.5 ml (pediatric)

Resistance of the sensor

0.5 cmH2O @ 30 l/min (adult), 1.0 cmH2O @ 10 l/min (pediatric)

1.4.2 Conditions exceeding normal

Accuracy specifications under the following condition (during warm-up 2 to 10 minutes):

Airway Pressure(Paw)

Accuracy ±2 cmH2O

Tidal volume

Accuracy ±10 % or 100 ml (adult), ±10 % or 10 ml (pediatric)

Document No. 800 1009-1

1.5 Gas exchange specifications

Mathemathical integration of airway flow and gas concentration for intubated, mechanically ventilated and/or partly spontaneously breathing patients.

NOTE: These specifications apply only when a 2 meter gas sampling line is used, and a Y-piece with a physical dead space less than 8 ml.

Compact Airway modules

NOTE: These specifications only apply if the FiO

0.2 % during the inspiratory cycle at the measurement point.

1.5.1 VO2 and VCO

Measurement range 50...1000 ml/min Resolution 10 ml/min Accuracy ±10 % or 10 ml; when FiO

1.5.2 RQ

Measurement range 0.6...1.2 Resolution 0.05

level delivered to the patient is varing by less than

< 65 %

±15 % or 15 ml; when 65 % < FiO

< 85 %

Document No. 800 1009-1

Datex-Ohmeda S/5 monitors

2 FUNCTIONAL DESCRIPTION

2.1 Measurement principle

2.1.1 CO2, N2O, and agent measurement

TPX is a side stream gas analyzer, measuring real time concentrations of CO2, N2O and anesthetic agents (Halothane, Enflurane, Isoflurane, Desflurane, and Sevoflurane).

Sample chamber

Temp sensor

Thermopile detectors

Sample gas out

Figure 1 TPX sensor principle

Anesthetic agents or mixtures of two anesthetic agents are automatically identified and concentrations of the identified agents are measured. TPX also detects mixtures of more than two agents and issues an alarm.

TPX is a nondispersive infrared analyzer, measuring absorption of the gas sample at seven infrared wavelengths, which are selected using optical narrow band filters.

The infrared radiation detectors are thermopiles.

Concentrations of CO

Sample gas in

and N2O are calculated from absorption measured at 3-5 µm.

Document No. 800 1009-1

Compact Airway modules

Figure 2 Absorbance of N2O and CO

Identification of anesthetic agents and calculation of their concentrations is performed by measuring absorptions at five wavelengths in the 8-9 µm band and solving the concentrations from a set of five equations.

Figure 3 Infrared absorbance of AAs

The measuring accuracy is achieved utilizing numerous software compensations. The compensation parameters are determined individually for each TPX during the factory calibration.

Document No. 800 1009-1

Datex-Ohmeda S/5 monitors

2.1.2 O2 measurement

The differential oxygen measuring unit uses the paramagnetic principle in a pneumatic bridge configuration. The signal picked up with a differential pressure transducer is generated in a measuring cell with a strong magnetic field that is switched on and off at a frequency of 165 Hz. The output signal is a DC voltage proportional to the O gases to be measured.

Sample in

Microphone

Electromagnet

concentration difference between the two

Mixture out

Switched magnetic field

Figure 4 O2 measurement principle

2.1.3 Patient spirometry

In mechanical ventilation breaths are delivered to the patient by a ventilator with a proper tidal volume (TV), respiration rate (RR), and inspiration / expiration ratio in time (I:E) determined by the settings of the ventilator. The Patient Spirometry monitors patient ventilation. The following parameters are displayed:

− Expiratory and inspiratory tidal volume (TV) in ml

− Expiratory and inspiratory minute volume (MV) in l/min

− Expiratory spontaneous minute volume in l/min

− Inspiration/expiration ratio (I:E)

Airway pressure

− Peak pressure (P

− Mean airway pressure (P

monitors

− End inspiratory pressure (P

− PEEPi, PEEPe; available only in S/5 Critical Care and Compact Critical Care monitors

− Total positive end expiratory pressure (PEEP

Compact Anesthesia monitors

− Real time airway pressure waveform (P

− Static Positive end expiratory pressures (Static PEEP

S/5 Critical Care and Compact Critical Care monitors

Reference in

)

peak

); available only in S/5 Critical Care and Compact Critical Care

mean

)

plat

); available only in S/5 Anesthesia and

tot

)

and Static PEEPe); available only in

Document No. 800 1009-1

Compact Airway modules

− Static Plateau pressure (Static Pplat); available only in S/5 Critical Care and Compact

Critical Care monitors

− Static Compliance (Static Compl); available only in S/5 Critical Care and Compact Critical

Care monitors

Airway flow

PEEP, P

peak

, P

mean

, and P

are measured by pressure transducer on the PVX board. Atmospheric

plat

pressure is used as a reference in measurement. The pressure measurement is made from the airway part that is closest to the patient between patient circuit and intubation tube.

=intrinsic PEEP, PEEP

PEEP

-PEEP

tot

Static pressure measurement maneuvres are automatically identified based on a increased zero flow period at the end of the inspiration or expiration.

Static Compliance is calculated if Static PEEP and Static P

measurements were done within a 2

plat

minutes period.

− Real time flow waveform (V')

− Compliance (Compl)

− Airway resistance (Raw)

− Pressure volume loop

− Flow volume loop

The measurement is based on measuring the kinetic gas pressure and is performed using the Pitot effect. A pressure transducer is used to measure the Pitot pressure. The obtained pressure signal is linearized and corrected according to the density of the gas. Speed of the flow is calculated from these pressure values and TV value is then integrated. MV value is further calculated and averaged using TV and RR (respiratory rate) values.

Compliance and airway resistance

Compliance is calculated for each breath from the equation

Compl−−=

plat

exp

PEEPPEEPP

Formula 2

Compliance tells how big a pressure difference is needed to deliver a certain amount of gas into the patient.

The airway resistance, Raw, is calculated using an equation, that describes the kinetics of the gas flow between the lungs and the D-lite. The equation states that the pressure at the D-lite can at any moment of the breath be approximated using the equation

tVtVRaw

)()('

)(

+×

ie PEEPPEEPCompl

Formula 3

where p(t), V’(t) and V(t) are the pressure, flow and volume measured at the D-lite at a time t, Raw is the airway resistance, Compl is the compliance and PEEP expiratory pressure (PEEP

tot

+PEEPi is the total positive end

Document No. 800 1009-1

Datex-Ohmeda S/5 monitors

D-lite

Patient Spirometry uses a specific sensor called D-liteTM flow sensor. Different types of the D-lite sensors are available: adult sensor for measuring adults and pediatric sensor for children. Both are available as reusable versions and D-lite sensor also for single use. D-lite adapter is designed to measure kinetic pressure by two-sided Pitot tube. Velocity is calculated from pressure difference according to Bernoulli's equation. Flow is then determined using the calculated velocity.

2dP×

(from Bernoulli's equation) Formula 4

F=v A× ,

where:

F = flow (l/min), v = velocity (m/s), A = cross area (m

= density (kg/m3)

Finally the volume information is obtained by integrating the flow signal.

2.1.4 Gas exchange measurement

The gas exchange measurement uses the D-liteTM flow sensor and the gas sampler.

The basic data which is needed to obtain O concentrations.

Concentrations have been corrected for delay and deformation during the transport of the gas sample in a sidestream gas measurement sensor.

To obtain the amount of O the amount that is inhaled.

), dP = pressure difference (cmH2O),

consumption and CO2 production are volumes and

consumed in ml/min, the amount which is exhaled is subtracted from

To obtain the amount of CO the amount that is exhaled.

These amounts can be obtained by multiplying each measured volume piece (dv) by the corresponding gas concentration:

and

Using inspiratory and expiratory minute volumes MV concentrations fi and fe these equations can be rewritten as:

Document No. 800 1009-1

producted in ml/min, the amount which is inhaled is subtracted from

−

dvfdvf OO

insp

VCO 22 Formula 6

exp

dvfdvf COCOò−

inspexp

and MVe and volume-weighted inspiratory

eOiO=2 MVfe-MVfiVO 22 ×× [ml/min] Formula 7

Formula 5

Compact Airway modules

iCOeCO=2 MVfi-MVfeVCO 22 ×× [ml/min] Formula 8

To obtain results which are less sensitive to errors in volume measurements, so-called Haldane transformation is used. This means taking advantage of the fact that the patient is not consuming nor producing nitrogen: the amount of nitrogen inhaled is equal to the amount exhaled fi

and VCO2 can then be written as:

× MVi=feN2×MVe.

iOHaldO2 )MVfef-(fi=VO 22 × [ml/min] Formula 9

iCOCOHald2 )MVfi-fe(f=VCO 22× [ml/min] Formula 10

with

Hald

= (1-fi

– fiO2 – fi

CO2

N2O

- fi

Ane1

– fi

Ane2

) / (1-fe

– feO2 – fe

CO2

N2O

- fe

Ane1

– fe

Ane2

)

EE=(5.5 × VCO

with Un=Urea Nitrogen Excretion = 13 g/day (for adults only).

2.2 Main components

The compact airway modules consist of:

• Gas sampling system

• TPX measuring unit

• OM measuring unit

• PVX measuring unit

• CPU board

• OM board

• PVX board

2.2.1 Gas sampling system

The sampling system takes care of drawing a gas sample to the analyzers at a fixed rate.

The gas sampling system samples the measured air to the module, and removes water and impurities from it. A sampling line is connected to the water trap. The pump draws gas through the sampling line to gas measuring units. After the measurements, the gas is exhausted from sample gas out connector.

) + (1.76 × VO2) + (1.99 × Un) [kcal/day] Formula 11

The M-COVX and M-CAiOVX modules have a different gas sampling system compared to the other modules. A number of flow restrictors have been changed to create a bigger pressure difference with ambient pressure in the gas sensors. The sample flow is however about the same (200 ml/min).

A bigger pressure difference makes the deformations of the gas concentration curves less sensitive to high variations of the airway pressures thus meeting also the accuracy requirements of gas exchange for these applications.

Document No. 800 1009-1

+ 43 hidden pages

Datex-Ohmeda S-5 Service Manual S5 Compact

Specifications and Main Features

Frequently Asked Questions

User Manual

Document No. 800 1009-1

June 2001

Table of contents

INTRODUCTION

1 SPECIFICATIONS

2 FUNCTIONAL DESCRIPTION

• Gas sampling system