Datex-Ohmeda S-5 Service Manual S5 Airway

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Page 1

S/5

Datex-Ohmeda

S/5TM Airway Module, G-AO (rev. 06)

S/5

Airway Module, G-AiO (rev. 05)

Airway Module, G-AiOV (rev. 04)

Airway Module, G-AOV (rev. 04)

Gas Interface Board, B-GAS (rev. 01)

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 1005-1

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

Page 2

Page 3

TABLE OF CONTENTS

S/5 Airway modules and S/5 Gas Interface Board, B-GAS

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 Respiration rate................................................................................................................................2

1.2.3 O

1.2.4 N

1.2.5 Hal, Iso, Enf......................................................................................................................................2

1.2.6 Sev..................................................................................................................................................2

1.2.7 Des..................................................................................................................................................3

1.2.8 Agent identification..........................................................................................................................3

1.2.9 Patient Spirometry............................................................................................................................3

1.2.10 Airway Pressure (Paw)...................................................................................................................3

1.2.11 Tidal Volume (TV)..........................................................................................................................3

1.2.12 Minute Volume (MV).....................................................................................................................3

1.2.13 Airway flow...................................................................................................................................3

1.3 Technical specification .............................................................................................................................4

1.3.1 CO

1.3.2 O

1.3.3 N

1.3.4 AA...................................................................................................................................................4

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

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

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

..................................................................................................................................................4

....................................................................................................................................................4

O .................................................................................................................................................4

2 Functional Description 5

2.1 Measurement principle.............................................................................................................................5

2.1.1 CO

2.1.2 O

2.1.3 Agent identification..........................................................................................................................7

2.1.4 Patient Spirometry............................................................................................................................ 8

2.2 Main components.....................................................................................................................................9

2.2.1 Gas sampling system......................................................................................................................10

2.2.2 ACX-200 measuring unit.................................................................................................................16

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

2.2.4 ACX measuring board.....................................................................................................................18

2.2.5 ASX agent identification bench........................................................................................................20

2.2.6 ASX measuring board.....................................................................................................................20

2.2.7 PVX board......................................................................................................................................22

2.2.8 Gas mother boar d...........................................................................................................................24

2.2.9 Gas interface board........................................................................................................................26

2.3 Connectors and signals...........................................................................................................................26

2.3.1 Module bus connector....................................................................................................................26

, N2O and Agent measurement....................................................................................................5

measurement..............................................................................................................................6

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Datex-Ohmeda S/5 Anesthesia Monitor

2.3.2 Gas mother board connectors.........................................................................................................27

3 Service Procedures 31

3.1 General service information....................................................................................................................31

3.2 Service check.........................................................................................................................................32

3.2.1 Recommended tools......................................................................................................................32

3.2.2 Recommended parts......................................................................................................................32

3.3 Disassembly and reassembly..................................................................................................................41

3.4 Adjustments and calibrations..................................................................................................................42

3.4.1 Gas sampling system adjustment...................................................................................................42

3.4.2 Flow rate measurement..................................................................................................................42

3.4.3 Oxygen measurement unit adjust ments...........................................................................................44

3.4.4 Flow calibration..............................................................................................................................46

4 Troubleshooting 47

4.1 Troubleshooting chart.............................................................................................................................47

4.1.1 Supply voltage troubleshooting.......................................................................................................48

4.2 Gas sampling system troubleshooting.....................................................................................................49

4.2.1 Sampling system leak test..............................................................................................................49

4.2.2 Water separation............................................................................................................................49

4.2.3 Steam test for the special tubes......................................................................................................49

4.3 OM measuring unit troubleshooting.........................................................................................................50

4.4 ACX troubleshooting...............................................................................................................................50

4.4.1 Cleaning the measuring chamber of ACX measuring unit..................................................................50

4.5 ASX agent identification unit troubleshooting...........................................................................................52

4.6 PVX board troubleshooting......................................................................................................................53

4.7 Gas mother board troubleshooting..........................................................................................................53

4.7.1 Instru ctions after replacing the software or Gas mother board...........................................................53

4.8 Error messages.......................................................................................................................................54

5Service menu 55

5.1 Gas mother board...................................................................................................................................56

5.2 ACX service menu...................................................................................................................................59

5.3 PVX service menu...................................................................................................................................61

5.3.1 Flow calibration..............................................................................................................................62

5.3.2 Temp & Hum service menu.............................................................................................................63

5.4 ASX service menu...................................................................................................................................64

6 Spare parts 65

6.1 Spare parts list.......................................................................................................................................65

6.1.1 G-AO rev. 01, G-A iO rev. 00............................................................................................................65

6.1.2 G-AO rev. 02, G-A iO rev. 01, G-AOV rev. 00, G-AiOV rev. 00.............................................................66

6.1.3 G-AO rev. 03, G-A iO rev. 02, G-AOV rev. 01, G-AiOV rev. 01.............................................................66

6.1.4 G-AO rev. 04, G-A iO rev. 03, G-AOV rev. 02, G-AiOV rev. 02, G-O rev. 00, G-OV rev. 00.....................67

6.1.5 G-AO rev. 05, G-A iO rev. 04, G-AOV rev. 03, G-AiOV rev. 03, G-O rev. 01, G-OV rev. 01.....................67

6.1.6 S/5 G-AO rev. 06, G-A iO rev. 05, G-AOV rev. 04, G-AiOV rev. 04......................................................67

6.1.7 Panel stickers................................................................................................................................67

6.1.8 S/5 panel stickers.........................................................................................................................68

6.1.9 Planned Maintenance (PM) Kits:.....................................................................................................69

6.1.10 Gas Interface Board, B-GAS.......................................................................................................69

7 Earlier Revisions 70

Document No. 800 1005-1

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Table of contents

APPENDIX A

Service check FORM A-1

TABLE OF FIGURES

Figure 1 CO2/N2O/AA gas absorption spectra.....................................................................................................5

Figure 2 O

Figure 3 Anaesthetic Agents gas absorption spectra............................................................................................7

Figure 4 Airway module block diagram...............................................................................................................9

Figure 5 Gas sampling system block diagram ...................................................................................................12

Figure 6 Gas sampling system layout................................................................................................................13

Figure 7 Gas sampling system block diagram ...................................................................................................13

Figure 8 Gas sampling system layout................................................................................................................14

Figure 9 ACX photometer (ACX-200 measuring unit)..........................................................................................16

Figure 10 CO

Figure 11 ACX measuring board block diagram...............................................................................................19

measurement principle....................................................................................................................6

O/AA measurement block diagram......................................................................................17

2/N2

Figure 12 ASX measuring unit ........................................................................................................................20

Figure 13 ASX measuring board block diagram...............................................................................................21

Figure 14 PVX board block diagram................................................................................................................23

Figure 15 Gas mother board block diagram....................................................................................................25

Figure 16 Gas sampling system adjustment chart...........................................................................................43

Figure 17 O

measuring unit adjustments.......................................................................................................46

Figure 18 ASX troubleshooting flowchart.........................................................................................................52

Figure 19 PVX board troubleshooting flowchart...............................................................................................53

Document No. 800 1005-1

iii

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Datex-Ohmeda S/5 Anesthesia Monitor

Document No. 800 1005-1

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INTRODUCTION

The S/5 Airway Modules, G-AO, G-AiO, G-AOV and G-AiOV are designed for use with the S/5 Anesthesia Monitor and provide airway and respiratory parameters. Later in this manual modules can be called w/o system name S/5.

This Technical Reference Manual Slot provides information for the maintenance and service of the airway modules. Please see also related system e.g. related documentation, conventions used, symbols on equipment, safety precautions, system description, system installation, interfacing, functional check and planned maintenance.

Letters in the name stand for: G = Side mountable gas module O = CO V = Patient Spirometry A = Anesthetic agents i = Agent identification

, Patient O2, and N2O

Technical Reference Manual

S/5 Airway modules

for information related to

Table 1 Options of Parameter Modules

G-AO G-AiO G-AOV G-AiOV

NOTE: The Airway Modules and Compact Airway Modules cannot be used simultaneously in the same monitor.

Gas Interface Board

Gas Interface Board, B-GAS is used for connecting the airway module to the central unit. The connection can also be made through the Interface Board, B-INT.

N2O Patient O

•• • •

•• • • •

•• • • • •

Agents Agent id Spirometry

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Datex-Ohmeda S/5 Anesthesia Monitor

1 SPECIFICATIONS

1.1 General specifications

Module size, W × D × H 135 × 410 × 135 mm/5.3 × 15.0 × 5.3 in Module weight 6 kg/13 lbs.

1.2 Typical performance

Sampling rate 200 ml/min nominal (180...220 ml/min) Display update rate breath-by-breath

Automatic compensation for pressure, CO Warm-up time 3 min for operation, 30 min for full specifications.

Auto-zeroing is performed at start-up, after 5 min + 5 min + 5 min + 15 min + 15 min + 15 min, and after that every 60 min at regular intervals.

1.2.1 CO

Measurement range 0 to 10 %, (0 to 10 kPa), (0 to 76 mmHg) Extended range 10 to 15 %, (10 to 15 kPa), (76 to 114 mmHg) (unspecified)

concentration is below 0.1 %, 0.0 % is displayed.

If CO

1.2.2 Respiration rate

Breath detection 1 % change in CO2 level Measurement range 4 to 60 breaths/min

1.2.3 O

Measurement range 0 to 100 % O

1.2.4 N2O

O, and CO2-O2 collision broadening effect.

2-N2

Measurement range 0 to 100 % N2O

1.2.5 Hal, Iso, Enf

Measurement range 0 to 5 % Extended range 5 to 15 % (unspecified)

1.2.6 Sev

Measurement range 0 to 8 % Extended range 8 to 15 % (unspecified)

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1.2.7 Des

Measurement range 0 to 18 % Extended range 18 to 30 % (unspecified)

Resolution two decimals when the AA concentration below 1.0 % If AA concentration is below 0.10 %, 0.00 % is displayed.

1.2.8 Agent identification

Identified agents HAL, ENF, ISO, SEV, DES Identification time 30 seconds (typical value with pure agents) Identification threshold 0.15 vol% (typical)

Mixture warning when minor component concentration > 0.3 vol% and > 15 %of total agent concentration

1.2.9 Patient Spirometry

Values are valid when: Respiratory rate adult 4...30 pedi 4...50 breaths/min I:E ratio 1:3 - 1:0.5 Inner diameter of ET tube is ≥ 5.5 mm (adult) or 3 to 6 mm (pediatric).

S/5 Airway modules

1.2.10 Airway Pressure (Paw)

Accuracy ±1.5 cmH2O Resolution 1 cmH Measuring range -20 to +80 cmH

1.2.11 Tidal Volume (TV)

Accuracy ±6 % or 30 ml (adult); ±6 % or 4 ml (ped) Resolution 1 ml Measurement range 150 to 2000 ml (adult)

1.2.12 Minute Volume (MV)

Resolution 0.1 l/min Measurement range 2 to 15 l/min (adult)

1.2.13 Airway flow

Measurement range 1.5 to 100 l/min for both directions (adult)

15 to 300 ml (ped)

0.5 to 5 l/min (ped)

0.25 to 25 l/min for both directions (ped)

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Datex-Ohmeda S/5 Anesthesia Monitor

1.3 Technical specification

1.3.1 CO

1.3.2 O

1.3.3 N2O

Measurement rise time <360 ms (from 10 to 90 %) Gain stability ≤0.2 %CO

≤0.4 %CO

Gain temperature drift ≤0.2 %CO

≤0.4 %CO

Nonlinearity error ≤0.2 %CO

≤0.4 %CO

/24 h (0 to 8 %)

/24 h (8 to 10 %)

/10 °C (0 to 8 %)

/10 °C (8 to 10 %)

(0 to 8 %)

(8 to 10 %)

Measurement rise time <480 ms (from 10 to 90 %) Gain drift ≤2 % O Gain temperature drift ≤3 % O Nonlinearity error ≤2 % O

/24 h

/10 °C

2 2

Measurement rise time <360 ms (from 10 to 90 %) Gain drift ≤2 % N Gain temperature drift ≤3 % N Nonlinearity error ≤2 % N

O/24 h

O/10 °C

1.3.4 AA

Measurement rise time <520 ms (from 10 to 90 %) Gain drift ≤0.4 % AA/24 h Gain temperature drift ≤0.4 % AA/10 °C Nonlinearity error ≤0.2 % AA

Protection against electrical shock

Type BF

Document No. 800 1005-1

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2 FUNCTIONAL DESCRIPTION

2.1 Measurement principle

2.1.1 CO2, N2O and Agent measurement

The CO2, N2O, and anesthetic agent gas measurements are based on absorption of infrared light as it passes through the gas sample in measuring chamber in the photometer. The light absorption is measured at three wavelengths using an infrared detector. One of the wavelengths is that of the

absorption peak at 4.3 micrometers, the second is that of the N2O absorption peak at 3.9

micrometers, and the third is that of the anesthetic agent absorption peak at 3.3 micrometers. The signal processing electronics receive the signals from the IR detector and demodulate it to get DC components out of these signals which correspond to the content of each gas in the sample.

S/5 Airway modules

Figure 1 CO2/N2O/AA gas absorption spectra

Document No. 800 1005-1

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Datex-Ohmeda S/5 Anesthesia Monitor

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 110 Hz. The output signal is a DC voltage proportional to the O gases to be measured.

Microphone

Electromagnet

concentration difference between the two

Mixture out

Switched magnetic field

Sample in

Reference in

Figure 2 O2 measurement principle

Document No. 800 1005-1

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2.1.3 Agent identification

The anesthetic agent identification bench identifies Halothane, Enflurane, Isoflurane, Desflurane and Sevoflurane.

The bench measures the spectrum of the gas between 3.24 µm and 3.39 µm. Because the spectrum of each of the anaesthetic agents is different it is possible to identify them.

The bench consists of an infrared source, a measuring chamber, a rotating filter and a detector. The peak wavelength of the narrow bandpass filter changes when the angle between the light path and the filter is changed. When the filter rotates the required spectrum is scanned through. The agent or a mixture of agents is identified by comparing the measured spectrum with stored reference spectra.

500 450 400 350 300 250 200 150 100

S/5 Airway modules

Anesthetic Agent Gas Absorption Spectra

Halothane 0 Enflurane 0 Isoflurane 0 Sevoflurane 0 Desflurane 0 Freon 0

3246

3306

Wavelength [nm]

Figure 3 Anaesthetic Agents gas absorption spectra

3386

Document No. 800 1005-1

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Datex-Ohmeda S/5 Anesthesia Monitor

2.1.4 Patient Spirometry

In anesthesia, CMV (Controlled Mechanical Ventilation) is the mostly used ventilation mode. In this mode, mechanical 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.

Delivery of life support gases is based on pressure. However, without knowing volume measured of exhalation, one cannot be sure that a breath occurred. The ultimate goal of ventilation is to use the least amount of pressure to generate the most appropriate volume for each breath.

The Patient Spirometry monitors ventilation in anesthesia. Both patient breathing circuit and the function of the ventilator are monitored. The following parameters are displayed:

Expiratory and inspiratory tidal volume (TV) in ml. Expiratory and inspiratory minute volume (MV) in l/min. Expiratory volume in first second (V1.0) in per cent for adults and in 0.5 seconds for children. Inspiration/expiration ratio in time (I:E) Airway pressures: Peak pressure (P pressure (PEEP), Real time airway pressure waveform (P Flow: Real time flow waveform (V') Compliance (C) Pressure volume loop Flow volume loop

), End inspiratory pressure (P

peak

)

), Positive end expiratory

plat

Airway pressure

Airway flow

PEEP, P

peak

, and P

are measured by pressure transducer on the PVX board. Atmospheric pressure

plat

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.

The measurement is based on measuring the kinetic gas pressure and is performed using Pitot effect. 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 a nd averaged using TV and RR (respiratory rate) values.

Document No. 800 1005-1

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Patient Spirometry sensor, D-lite

Patient Spirometry is measured with a specific sensor, D-lite or Pedi-lite. D-lite and Pedi-lite sensors are designed to measure kinetic pressure by t wo-sided Pitot tube. The

pressure reduction caused by measuring cross is taken into account, too, especially in small flows. Velocity is calculated from pressure difference according to Bernoulli's equation. Flow is then

determined using the calcula ted velocity.

2dP×

S/5 Airway modules

(from Bernoulli's equation)

F=v A×

where, F=flow (l/min) v=velocity (m/s) A=cross area (m dP=pressure difference (cmH

ρ=density (kg/m

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

2.2 Main components

The airway modules consist of ACX-200 and OM-101 gas measuring units, ASX-200 agent identification unit (G-AiO/AiOV), PVX board (G-OV/AiOV/AOV), gas sampling system, ACX measuring board and gas mother board.

Oxygen Measuing Unit

Serial I/O

Supply voltages

+5 V, GND

Serial I/O

)

O2 signal

ACX Board

Signal out

Supply voltages, Control

ACX

Supply

serial

voltages

I/O

Gas Module CPU

ACX Bench

X1 X2

Valve controls

ACX, ASX, PVX serial I/O

+5 Vref

+5 VL GND

GNDD

Lamp Supply Voltage

Lamp Driver

Lamp control

Pump control Mod key in

Lamp control

ASX Unit

Supply voltages

ASX serial i/O

Valve controls

+15 VD, GNDD

Pump control

+15 VD, GNDD

PVX Board

Supply voltages

PVX serial i/O

Valve Driver

Pump Driver

X1 X3

Gas pressure and flow in

X10

+24/+32 VD

X12

+15 VD

Fan

Valves

Pump

+5 V +5 VL +15 VD +/-15 V +24 /+32 VD GND GNDD

+15 V

Regulator

Figure 4 Airway module block diagram

Gas Mother Board

GND

Mod key in

X11

Module Key

Document No. 800 1005-1

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Datex-Ohmeda S/5 Anesthesia Monitor

2.2.1 Gas sampling system

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 on the front panel. The pump draws gas through the sampling line to gas measuring units. After the measurements, the gas is exhausted from sample gas out connector on the rear panel of the module.

Water trap, D-fend

The gas sample enters the monitor through the water trap, where it is divided into two flows, main flow and side flow (see Gas sampling system block diagram). The main flow goes into the measuring system through a hydrophobic filter.

The side flow creates a slight sub-atmospheric pressure within the water trap container. This facilitates gathering th e fluid removed by the hydrophobic filter.

Sampling line

The sampling line is an integral part of the total sampling system. The resistance established by the sampling line is significant when the software determines the occlusion a nd air-leak alarm limits during the turn-on sequence.

The Nafion

Zero valve

The small inner diameter causes fluids such as blood or mucus not to propagate within the tube, so that when the line is clogged, it is replaced.

tube

A nafion tube (tubes A or B, and C: see figure 5) is used to balance the sample gas humidity with that of ambient air. The tube will prevent errors caused by the effect of water vapor on gas partial pressure when humid gases are measured after calibration with dry gases. It is inserted between the water trap and the zero valve (G-AiO/A iOV) or between the zero valve and ACX-200 measuring unit (G-O/OV/AO/AOV). The tube is also inserted between the CO

absorber and the zero valve.

The main flow passes through a solenoid valve before proceeding to the ACX-200 measuring unit. This valve is activated to establish the zero points for the A CX-200 and O

measuring units at start-

up, at 5 minutes, and after that at regular intervals. After 1-hour monitoring, the auto-zeroing is performed once an hour. When the valve is activated, room air is drawn through the CO into the internal system and the gas sensors.

absorber

Document No. 800 1005-1

Nafion is a trademark of Du Pont

Page 17

Gas measuring units, ACX-200 and O2 unit

After the zero valve, the gas passes through the ACX-200 and O2 measuring units. In the ACX-200 measuring unit, infrared light is passed through chambers containing the main flow gas (measurement) and a chamber containing reference gas. The measurement is made by determining the ratio between the two light intensities.

The oxygen sensor has two inputs. One input accepts the main flow and the other draws in room air for reference. The sensor uses a differential pressure transducer to compare the pressure gradient produced when both gases are exposed to an oscillating magnetic field. Both gas flows exit from a single port.

In i model, the ASX agent identification unit is installed in parallel with the oxygen sensor . The task of the ASX unit is to identify anesthesia agents by infrared light method used also in the ACX-200 unit.

Pressure valve

The pressure valve is used to meas ure the pressure gradient between the O2 measurement flow and the O filter.

reference flow. This pressure gradient reflects the condition of the D-fend water trap

S/5 Airway modules

Normally the pressure gradient between the O approximately +8 mmHg. If the software detects the gradient to be between 0 and -5 mmHg, the pressure valve will initiate pressure measurement of the reference flo w. If the gradient is greater than -5 mmHg, the software triggers the message ’Replace Trap’.

Flow cassettes

The internal flow rates are set using flow cassettes. These cassettes are used to set the side flow rate and the O

reference flow rate, the flow rates through the measuring units and the total flow

rate of the sampling system.

Sampling pump and damping chamber

The sampling pump is a vibrating membrane pump driven by a 50 Hz/12 V/0.4 A square wave current.

The damping chamber is used to even out the pulsating flow and silence the exhaust flow.

measurement flow and the reference flow is

Document No. 800 1005-1

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Datex-Ohmeda S/5 Anesthesia Monitor

Figure 5 Gas sampling system block diagram

In G-AO, -AOV models, tube A is Teflon, B and C Nafion. In G-AiO, -AiOV models, tubes A and C are Nafion, B is Teflon.

See new tubing since autumn 1998 in figure 7.

Document No. 800 1005-1

Page 19

S/5 Airway modules

Ref IN Room AIR

Sample Gas IN

Figure 6 Gas sampling system layout

See new sampling system layout since autumn 1998 in figure 8.

Filter

absorber

Pressure valve

Pressure transducer

ASX-200

in G-AiO/AiOV

Sample pump

Zero valve

main flow

D-fend

ACX-200

O2 sensor

Damping chamber

side flow

Constriction casse tte

Figure 7 Gas sampling system block diagram

In G-AO, -AOV models, tube A is Teflon, B and C Nafion. In G-AiO, -AiOV models, tubes A and C are Nafion, B is Teflon. Figure 7 is valid for modules manufactured since autumn 1998.

Sample Gas OUT

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Datex-Ohmeda S/5 Anesthesia Monitor

Figure 8 Gas sampling system layout

Figure 8 is valid for modules manufactured since autumn 1998.

Document No. 800 1005-1

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Table 2 Flow cassettes

S/5 Airway modules

Flow

Code

cassette

50/26.0 878048 50/19.0 873800 50/16.3 878047 50/15.3 873801 50/14.1 878046 50/13.1 873802 50/12.4 878045 50/11.2 874770 50/10.4 873803 50/9.2 874509 50/8.7 873804 50/7.4 873805 50/6.5 878044 50/5.8 873806 50/5.1 878043 50/4.4 873807 50/3.8 878042 50/3.2 873808 50/3.0 878040 50/2.8 878039 50/2.5 878038 50/2.3 873809 50/2.0 878037 50/1.8 873810 50/1.6 878036 50/1.4 873811 50/1.1 873812

NOTE: The number on the cassette represents relative flow when a specific pressure is applied. Therefore 50/26.0 presents the least resistance and 50/1.1 the most.

Document No. 800 1005-1

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Datex-Ohmeda S/5 Anesthesia Monitor

2.2.2 ACX-200 measuring unit

The ACX photometer is of dual path type. The infrared light beam passes through a measuring chamber containing the gas to be analyzed, and a reference chamber, which is free of CO and AA. The measurement is made by determining the ratio between the two light intensities.

, N2O,

Figure 9 ACX photometer (ACX-200 measuring unit)

A filter wheel is used to control the light from an incandescent lamp that passes through the photometer. The filters are arranged so that the light is passed sequentially:

• first at the CO

• then through the measuring chamber

• finally it is blocked completely

The same sequence is repeated at the N

absorption wavelength through the reference chamber

O and anaesthetic agent gas absorption wavelengths.

After passing through the filters the light is reflected and focused by a mirror onto the infrared detector. This detector measures the three light levels for each gas described above.

There is an optical sensor incorporated in the photometer which detects light from a reflective surface on the filter wheel once every revolution. The pu lses from this sensor are us ed to synchronize the electronics to the signal from the infrared detector. A stabilizing diode measures the temperature, which is needed to compensate for thermal drifts. The infrar ed detector, the optical sensor and the stabilizing diode are mounted on the preamplifier board.

Document No. 800 1005-1

Page 23

S/5 Airway modules

Figure 10 CO2/N2O/AA measurement block diagram

2.2.3 OM measuring unit

The oxygen measurement is based on the paramagnetic susceptibility, which is a unique property of oxygen among all gases generally present in a breathing gas mixture. The gas to be measured and the reference gas, which usually is room air, are conducted into a gap in an electromagnet with a strong magnetic field switched on and off at a frequency of approximately 110 Hz.

An alternating differential pressure is generated between the sample and reference inputs due to forces acting to the oxygen molecules in a magnetic field gradient.

The pressure is measured with a sensitive differential transducer, rectified with a synchronous detector and amplified to produce a DC voltage proportional to the oxygen partial pressure difference of the two gases.

Document No. 800 1005-1

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Datex-Ohmeda S/5 Anesthesia Monitor

2.2.4 ACX measuring board

The measuring electronics can be divided into a few functional blocks, which are described below (see the block diagram in figure 11).

The ACX Measuring board controls gas measurements. It converts the photometer signal into digital data, calculates results and transmits it to Gas mother board. The board contains, in addition to the 80C51FA processor, EPROM, RAM, and EEPROM, several analog and digital I/O functions.

Internal and external bus

The processor has access to the Measuring board peripherals (memory, A/D converter, D/A converters, etc) via an internal bus. For communication between the Gas mother board and the Measuring board, there is an external bus in connector X1.

Memory

Memory components include 64k × 8 bit EPROM program memory, 32k × 8 bit low current CMOS RAM, and EEPROM for permanent calibration values and setup memory.

Document No. 800 1005-1

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S/5 Airway modules

Figure 11 ACX measuring board block diagram

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Datex-Ohmeda S/5 Anesthesia Monitor

2.2.5 ASX agent identification bench

The ASX-200 agent identification bench has one measuring chamber. Background compensation is done by subtracting the background spectrum from the measured signal. Background spectrum is measured simultaneously with the zeroing of the ACX-200 unit. The resulting spectrum is analyzed to identify the agent.

The ASX unit requires two calibrations. One is the time between synchronization pulse and measured spectrum (time offset) of the ASX-200 and the other is the peak wavelength of the narrow bandpass filter. The former is calibrated automatically together with the gas calibration of the ACX and the latter is calibrated at the factory.

Preamplifier

ASX Bord

Figure 12 ASX measuring unit

ASX preamplifier board

The absorption of infrared light is measured with a lead selenide detector. The signal is amplified and then led to the measuring board.

2.2.6 ASX measuring board

The measuring electronics can be divided into a few functional blocks, which are described below (See the block diagram in figure 13).

The ASX measuring board controls the measurement. It converts the ASX photometer signal to digital data, calculates results and communicates with the main CPU through a serial channel. The board contains, in addition to the 80C196 processor, EPROM, RAM, and EEPROM, several analog and digital I/O functions.

Processor section

ASX Unit

Processor is a 80C196 and works at 12 MHz. It has an internal A/D-converter with a multiplexer. One channel is used for converting temperature signal. Two others are for the measurement signal from preamplifier board.

The processor uses an internal bus to access EPROM (64k x 8 bit), SRAM (8k x 8 bit) and two D/Aconverters. It communicates with the Gas mother board through a serial channel (RXD, TXDB).

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S/5 Airway modules

EEPROM is a 64 x 16 bit serial chip. It is partly protected so that if jumper X1 is installed the processor can erase or write the protected registers by serial communication commands. The protected section contains permanent factory calibrations.

Figure 13 ASX measuring board block diagram

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Datex-Ohmeda S/5 Anesthesia Monitor

2.2.7 PVX board

When Patient Spirometry is used, special sensors, D-lite or Pedi-lite, replaces the normal airway adapter in the patient circuit. The spirometry tubing is attached to the two connectors on the sensor and on the module front panel.

NOTE: Overpressure or negative pressure of more than 300 cmH should never be applied.

The board is intended to perform the following tasks

• Measure the pressures in airways and the speed of breathing flow.

• Calculate tidal volume, minute volume, compliance and other useful information on patient

lungs.

Pressure transducers

There are two pressure transducers on the PVX board for airway pressure measuring purposes. The breathing flow of a patient passing through D-lite adapter creates pressure difference. This

pressure difference is measured by pressure transducer, B1. Overpressure and negative pressure in airways are measured by another pressure transducer B2.

NOTE: Never apply DIFFERENTIAL pressure higher than 25 cmH sure that both spirometry tubes are always connected.

Temperature compensation

Temperature is measured by B1. This signal is used only for temperature compensation of the pressure transducer B1 on the PVX board.

O to the flow and volume tubing

O to the spirometry tubing. Make

Data processing

After the multiplexer, the signals, PRESS, FLOW0, FLOW1, and TEMP are A/D converted for data processing.

External communication

Communication between the PVX board and the Gas mother board is established in serial form, using the serial channel (pins 10 and 11) of CPU on the PVX board.

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Figure 14 PVX board block diagram

Gas Pressure and Flow IN (from Front Panel)

Room Pressure

Gas Pressure and Flow IN (from Front Panel)

Zero Valve

to Gas mother bo ard

Vol

Flow

Pressure

OUT

Press Sense

Temp sense

Press Diff. Sense

PRESS

MUX

TEMP

A/D Converter

D12

Reset

from/to Gas mother board

FLOW1

OFFSET

FLOW0

BUS

CPU 8051FA

EPROM

MUX

D/A Converter

EEPROM

D12

SRAM

Serial In

Serial Out

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S/5 Airway modules

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Datex-Ohmeda S/5 Anesthesia Monitor

2.2.8 Gas mother board

The Gas mother board controls power supply to each measuring unit, as well as the serial communication between the units and the module processor. There are connectors for the pump, valves and gas measuring units on the board. The board contains a processor which controls the functions within the module.

The tasks of the module processor are:

• to receive commands from the main CPU board and pass them on to Measuring boards.

• to gather measurement results from the Measuring boards, analyze them, and transmits

data to the main CPU board.

• to control the valves and pump based on the data which ACX Measuring board transmits.

Main parts

• Module processor 80C196KC/16 MHz

• 16 MHz oscillator

• EPROM program memory

• External RAM memory

• EEPROM

• Address and data bus latch

• Address decoding GAL-circuit

• 4-channel serial communication IC (QUART, D4)

External communication

Serial communication bus inside the module processor is used. The bus is connected to module bus via RS-485 buffer. Transmit and reception controls of buffer are contro lled by the processor.

Connections to measuring boards

Data collection from the measuring units takes place in serial communication bus. Serial communication lines of the measuring units are connected to QUART IC on the Gas mother board; Channel 1 - ACX, channel 2 - ASX, channels 3 - PVX, channel 4 - not in use). The transmit side of QUART has a buffer IC and the receipt side has a pull-up resistor.

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Valves, pump and infrared lamps control

Valves are controlled by ACX Measuring board from which the control signals are ran through buffer IC to the valve connector. OCCLUS signal controls the pressure (occlusion) valve and ZERO signal controls the zero valve. Control signal for the pump comes from the module processor. The signal is 50 Hz pulse-width modulated square wave. Control command is received from ACX Measuring board in serial communication. Control command (LAMP) of the infrared lamps of the chambers comes from the module processor.

Key push reading

CPU reads the front panel key pushes.

Reset

Voltage supervising circuit performs power-on reset. Reset from the module bus is connected via RS-485 buffer.

S/5 Airway modules

X4: OM SENSOR

X2: ACX UNIT

ZERO OCCLUS

MODULE BUS RESET

RS-485 buffer

POWER RESET

buffer

EPROM

RAM

X5: ASX SENSOR

SERIAL COMM. CHIP

CPURESN

Voltage

supervisor

NRESET

X1: AUX I/O

CPU

PUMPDRV

LAMPDRV

X3: PVX SENSOR

buffer

LAMP DRIVER

VALVE DRIVERS

RS-485 buffer

PUMP DRIVER

ANALOG: VOL. AWFLOW, AWPRE

MODULE BUS SERIAL COMM.

X11: MODULE KEYBOARD

X7: PUMP

X9: ACX. X8: ASX LAMPS

X12: VALVES

Figure 15 Gas mother board block diagram

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Datex-Ohmeda S/5 Anesthesia Monitor

2.2.9 Gas interface board

The Gas interface board, B-GAS is used for connecting an Airway Module to the Central Unit. The board connects Airway Module signals to the module bus and supplies voltages from the

module bus to the Airway Module. On the board there is a fuse (T4A) and some capacitors to regulate the power supply.

2.3 Connectors and signals

2.3.1 Module bus connector

Pin No I/O Signal

1 I RESET RS485 2 I -15 VDC 3 I +15 VDIRTY 4 I +15VDC 5 I/O -DATA RS485 6 I/O DATA RS485 7 Ground and Shield 8 I -RESET RS485 9n/c 10 n/c 11 n/c 12 n/c 13 Ground and Shield 14 I +24/+32 VDIRTY Depends on power supply 15 I Ground DIRTY 16 n/c 17 n/c 18 n/c 19 n/c 20 I GASFR (not used) 21 I CTSD (not used) 22 I TXDD (not used) 23 O RXDD (not used) 24 I +5 VDC 25 I +5 VDC DIRTY, for infrared lamps

For B-GAS CPU Mother Board connector, see CPU Bus Connector in the Central Unit Section.

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2.3.2 Gas mother board connectors

X1 Module connector. Serial communication bus to the main CPU

board. Supply voltages. X2 ACX Measuring board X3 PVX board X4 Oxygen measuring unit X5 ASX Measuring board X7 Sampling pump X8, X9 Power supply for infrared lamps (ACX, ASX) X10 Fan X11 Module front panel keys X12 Valves

S/5 Airway modules

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Datex-Ohmeda S/5 Anesthesia Monitor

ACX measuring board (X1) - Gas mother board (X2)

Pin No. a b c

1 +15 V NC AGND 2 -15 V NC +10 VREF 3 AOUT6 NC AOUT5 AA 4 AOUT4 VL NC AOUT3 CO 5AOUT2 O2NC AOUT1 N2O 6 DAC1 FLOW NC DAC0 PRES 7 AIN7 SAL NC ADC6 VOUT R 8 ADC5 AWL NC ADC4 VOUT IR 9ADC3 O2NC ADC2 10 ADC1 AWP NC AIN4 SSIGN 11 NC AGND NC 12 NC AGND NC 13 NC LAMP NC 14 NC PB5 NC 15 NC SSYNC NC 16 RBD2 SMOTOR NC 17 -RESET -PC0 TO RTSO 18 SEROUT 0 NC SERIN 0 19 P1.1 PC2 FGAIN 1 P1.0 20 OP0 RTSA PC3 FGAIN 2 INT0 21 SEROUT 1 PC4 OCCLUS SERIN 1 22 OP1 RTSB PC5 PUMPON IP2 TIMERIN 0 23 SEROUT 2 PC6 ZERO SERIN 2 24 NC PC7 RTS0 NC 25 NC PA0 NC 26 NC PA1 NC 27 NC PA2 NC 28 INT1 PA3 INT3 29 +5 V DRV PA4 +5 V 30 +15 VDIRTY PA5 +5 V 31 +12 V PA6 21 VAC 32 GND DIRTY PA7 ALR CALL DGND

NC = not connected AIN is an AD-converter and AOUT is a DA-converter in ACX board. ADC is an AD-converter and DAC is a DA-converter in the Gas mother board.

Document No. 800 1005-1

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ASX board (X5) - Gas mother board (X5)

Pin No. Signal

1 Analog ground 2N/C 3N/C 4N/C 5 +15 V 6 -15 V 7 DIRB (not used) 8RXD 9TXDB 10 N/C 11 -RESET 12 +5 V 13 +15 VDIRTY 14 Digital ground

S/5 Airway modules

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Datex-Ohmeda S/5 Anesthesia Monitor

PVX board (X1) - Gas mother board (X3)

Pin No. a b c

1 +15 V NC AGND 2 -15 V NC +10 VREF 3NC NCNC 4NC NCNC 5NC NCNC 6 DAC1 FLOWY NC DAC0 PRES 7 VOL NC NC 8FLOW NCNC 9NC NCNC 10 PRESS NC NC 11 NC NC NC 12 NC NC NC 13 NC NC NC 14 NC NC NC 15 NC NC NC 16 NC NC NC 17 -RESET NC NC 18 NC DIR NC 19 NC NC NC 20 NC NC NC 21 RxD NC TxDP 22 NC NC NC 23 NC NC NC 24 NC NC NC 25 NC NC NC 26 NC NC NC 27 NC NC NC 28 NC NC NC 29 NC NC +5 V 30 +15 VDIRTY NC +5 V 31 NC NC NC 32 GND DIRTY NC DGND

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S/5 Airway modules

3 SERVICE PROCEDURES

3.1 General service information

Field service of the airway modules is limited to replacing faulty circuit boards or mechanical parts. The circuit boards should be returned to Datex-Ohmeda for repair.

Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full type designation, and a detailed fault description.

CAUTION Only trained personnel with appropriate equipment should perform the tests and

repairs outlined in this section. Unauthorized service may void warranty of the unit.

NOTE: After any component replacement see chapter

Adjustments and calibrations

CAUTION The ACX-200 photometer and its components are repaired/calibrated at the

factory. Attempts to repair/calibrate the unit elsewhere will adversely affect operation of the unit. Datex-Ohmeda supplies spare ACX-200 photometers. The information provided for the ACX-200 is for reference only.

CAUTION Due to the complicated and sensitive mechanical construction any service inside

the O

measuring unit should not be attempted.

CAUTION The ACX-200 Measuring board can be repaired and calibrated only at the factory. CAUTION The PVX-100 measuring unit can be repaired only at the factory.

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Datex-Ohmeda S/5 Anesthesia Monitor

3.2 Service check

These instructions include complete procedures for a service check. The service check is recommended to be performed after any service repair. However, the service check procedures can also be used for determining possible failures.

The procedures should be performed in ascending order. The instructions in clude a check form (

Appendix A

) which should be filled in when performing the

procedures. The mark

? in the instructions means that the check form should be signed after performing

the procedure. The procedures are designed for monitors with S/5 monitor software of revision 01. However, most

of the procedures also apply to monitors, which contain some other monitor software type/revision.

3.2.1 Recommended tools

Tool Order No. Notes

Screwdrivers Tools for blocking internal tubes A glass of water Flowmeter Multimeter Gas Interface Cable 2.5 m 884299 Sampling line 3.0 m 73319 Spirometry tube 884101 D-lite 733950 Calibration gas 755582

3.2.2 Recommended parts

Part Order No. Notes

Special tube 733383 Special tube 733382 OM ref. filter 86901 Fan filter 871558 Cable tie 64001 D-fend O-ring (2 pcs) 65312 D-fend (black) 876446 Sampling line 3.0 m 73319 Extra silicon tubing Spare constriction cassettes

Document No. 800 1005-1

Page 39

All modules

S/5 Airway modules

• Remove the airway module case, the top protection cover and the bronze plate from the

side of the O

• Detach the ACX measuring board and the PVX board with the support plate, if installed.

NOTE: Wear a static control wrist strap when handling PC boards. Electrostatic discharge may damage components on the board.

1. Check internal parts:

- screws are tightened properly

- cables are connected properly

- all IC’s that are on sockets are attached properly

- tubes are not pinched and there are no sharp bends on them

- tubes are connected properly

- there are no loose objects inside the module

sensor, if installed.

NOTE: Make sure that none of the tubes is in contact with the sampling pump or the O sensor.

2. Check external parts:

- the module case is intact

- the four rubber pads under the frame are all in place

- the metal rear panel is intact

- the equipotential tap and the sample gas out connector are tightened properly

- the block screws for the gas interface cable are in place and are tightened properly

- the D-fend latch is functioning properly

• Install the ACX measuring board.

• Detach the D-fend.

3. Check the condition of the rubber O-rings on the metal D-fend connectors, located inside

the module front cover. If necessary, detach the connectors by first disconnecting the tubes, then removing the

locking rings from the back of the front cover. NOTE: The O-rings are recommended to be replaced annually.

4. Check the OM ref. filter (order code 86901) visually, if installed.

NOTE: The OM ref. filter is recommended to be replaced annually. If the module does not contain the OM ref. filter, install it to prevent dirt entering the O

sensor reference channel:

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Datex-Ohmeda S/5 Anesthesia Monitor

a) shorten the thick O to the upper part of the CO b) connect the OM ref. filter to the loose end of the tube c) fasten the filter to the outermost hole in the tubing plate (at the PVX board side) with a cable tie (order code 64001)

reference channel tube by 4 centimeters (the tube that is connected

absorber)

• Replace the D-fend and the sampling line.

NOTE: Use only Datex-Ohmeda sampling lines in order to ensure proper functioning.

• Connect the module to the Central Unit with a long gas interface cable and switch the

monitor on.

• Configure the monitor screen so that all the needed parameters are shown, for example as

follows:

Monitor Setup

- Screen 1 Setup - Waveform Fields - Field 1 - Paw Field 2 - Flow Field 3 - Off Field 4 - O2 Field 5 - AA Field 6 - CO2

Digit Fields - Field 1 - Gases

5. Check that the module fan is running.

6. Wait until the message ‘Calibrating gas sensor’ disappears from the screen, then enter the Service menu:

Monitor Setup

Take down the information regarding Airway module software. NOTE: The PVX software string does n ot appear into the ‘Sw version/Unit id’ -list. Check PVX

software from the sticker that is located on the PVX software EPROM (if the PVX board was installed originally).

- Install/Service

(password 16-4-34)

- Service

(password 26-23-8)

7. Enter the ACX service menu:

Parameters - Gas Unit - ACX

Check that the ‘Timeouts’, ‘Bad checksums’ and ‘Bad c-s by mod’ -values are not increasing faster than by 50 per second. If one of the values is increasing faster, it indicates a failure in module bus communication.

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S/5 Airway modules

8. If the module contains a membrane key on the front panel, press the key at least for one second and check that it is identified, i.e. the text for Button changes from OFF to ON in the menu.

• Select Halothane as anesthetic agent by first selecting AGENTS from the ACX service menu:

Agents - Select Agent - Hal - Previous Menu

9. Check that the Calib zero -value for N2O is less than 61000.

If the value exceeds the limit, it indicates bad contamination in the ACX measuring chamber. The measuring chamber can be cleaned according to the special cleaning instructions found in the chapter Cleaning the measuring chamber of ACX measuring unit. However, if cleaning does not help, the whole ACX measuring unit should be exchanged.

NOTE: If the ACX measuring chamber was cleaned or the unit was replaced, then also the tubing between the D-fend and the ACX measuring unit, including the zero valve, should be replaced. The mentioned parts should not be cleaned.

NOTE: With monitor software S-___95 and S-___96 the Calib zero -value for N shown as a negative value. The correct value can be calculated by adding the shown value to the value 65536.

O is always

10. Check that the Ambient -value corresponds with the current ambient pressure (±20 mmHg).

11. Perform the steam test for the special tubes (Nafion), or replace the tubes.

NOTE: The special tubes are recommended to be replaced annually.

12. Check the CO2 absorber.

Keep the tip of the sampling line away from you and let the monitor draw in room air. Check the “Insp CO absorber.

” -value from the ACX service menu. If the value is less than 4, replace the CO

13. Check the zero valve.

Feed calibration gas into the sampling line and check that the gas readings in the service menu correspond with the gas values on the calibration gas bottle. Keep feeding gas and activate the zero valve from the menu. The O other gas readings near 0 %. If the readings did not drop, replace the zero valve.

reading should drop back near 21 %, the

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Datex-Ohmeda S/5 Anesthesia Monitor

14. Perform the sampling system leak test.

15. Block the tip of the sampling line with your finger until the ‘Amb-Work’ -value becomes stable. If the value does not reach 110, replace the sampling pump and repeat the leak test.

16. Check the flow rates, adjust if necessary. NOTE: If any of the constriction cassettes is replaced, the leak test should be repeated.

17. Check that the ‘Amb-Work’ -value is within 50... 75 and the OM (in-ref) -value is equal or higher than 0. If the values differ, readjust the flows.

18. Check the O2 sensor output voltage. Feed calibration gas and check that the value OM volt: mV in the menu rises at least to

2800 (3500 nominal). Adjust the O NOTE: The voltage measurement requires module software 884295 or 885388. If the value is not updated, measure the O

board connector X1, pin A9.

PVX boar d ACX meas. boar d

Gas mo t her boar d

ASX Me a suring un it

sensor output, if necessary.

sensor output voltage from the ACX measuring

Document No. 800 1005-1

The output voltage should rise at least to 2.8 V (3.5 V nominal).

Page 43

S/5 Airway modules

19. Perform gas calibration: AIRWAY GAS - GAS CALIBRATION NOTE: For maximum accuracy, a warm-up time of 30 minutes is recommended.

NOTE: If the module contains the agent identification unit, the ASX-100 or A SX-200, keep feeding gas at least 15 seconds after the message ‘Adjust’ appears in the menu. This way the agent identification unit has enough time for calibration.

• Enter the ACX service menu:

Monitor Setup

Parameters - Gas Unit - ACX

• Select Halothane as anesthetic agent:

Agents - Select Agent - Hal - Previous Menu

20. Perform the fall time measurement in the ACX service menu. Check that the measured fall times are within the ranges that are given in the Technical

Reference Manual. NOTE: The fall time measurement can be performed only with module software 884295 or

885388.

- Install/Service

(password 16-4-34)

- Service

(password 26-23-8) -

21. Perform the noise measurement. Check that the measured noise values are within the ranges that are given in the Technical

Reference Manual. NOTE: The noise measurement can be performed only with module software 884295 or

885388.

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Datex-Ohmeda S/5 Anesthesia Monitor

Agent identification option

22. Check that the ‘ACX_ASX Delay’ -value in the ACX service menu is within 400-800. If the value is not within the range, readjust the flows and repeat the fall time measurement.

• Enter the ASX service menu:

Gas Unit - ASX

NOTE: The ASX service menu values are not updated with the anesthetic identification unit ASX-100.

23. Feed calibration gas. When proper absorption spectrum is shown in the menu check that the Peak normal value is close to 10.50 (±0.20). Check also that the difference between the “Peak normal” and “Peak mirror” values is not higher than 0.30.

If the values do not meet the range, repeat the gas calibration.

• Set the AA identification to the automatic mode:

Agents - Select Agent - Auto - Previous Menu

24. Feed calibration gas (order code 755583) and check that the message 'Desflurane' appears into the digit field for gases.

NOTE: The ASX-100 is not capable of identifying Desflurane. NOTE: The ASX-100 with software 878364-1.1, or lower, is not capable of identifying

calibration gas R23 (order code 755582). Therefore, the message ‘Agent mixture’ should appear instead.

Document No. 800 1005-1

Page 45

Patient spirometry option

• Switch the monitor off and install the PVX board, then switch the monitor back on.

• Preset gas measurement settings:

Airway Gas - Spirometry Setup - Paw Scale - 20

1. Check that the patient spirometry connectors on the front panel are clean and intact.

2. Connect a clean spirometry tube to the module and a clean D-lite to the other end of the tube. Block the D-lite’s sampling line port, for example with a luer stopper. Take the D-lite into your hand and occlude both ends tightly with your fingers (or with both hands). Pressing firmly with the fingers creates a pressure inside the D-lite. Check that a pressure of at least 5 cmH

NOTE: If the module has the male & female patient spirometry connectors (pediatric option), make sure that the date marking on the D-lite is 10/94 or newer.

Flow Scale - 15

O is generated.

S/5 Airway modules

If the system leaks heavily, no pressure will be generated. If there is a small leak in the connections, the monitor will measure a pressure difference which is then interpreted as flow and seen on the monitor screen. The pressure waveform decreases slowly and the flow waveform either goes above, or below the zero line, depending on which of the connectors leaks.

In case of leakage, check all connections and try again.

3. Remove the blockage from the sampling line port and connect the sampling line. Breath through the wider side of the D-lite. Check that the flow waveform moves downwards when you breath in, and upwards when you breath out. If the flow waveform moves in opposite manner, check the order of the PVX tubes inside the module.

4. If possible, check the patient spirometry measurement also with the spirometry tester (order code 884202). Follow the instructions that are supplied with the tester.

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Datex-Ohmeda S/5 Anesthesia Monitor

All Airway modules

• Switch the monitor off, disconnect the gas interface cable and reassemble the module.

NOTE: When reassembling the module, make sure that the tubes and cables are not pinched between the PC boards and covers.

29. Clean, or replace the airway module fan filter.

30. Perform electrical safety check and leakage current test.

• Reconnect the gas interface cable and sampling line, switch the monitor on and wait until

the message ‘Calibrating gas sensor’ disappears from the screen.

31. Block the tip of the sampling line with your finger and check that the message ‘Sample line blocked’ appears onto the monitor screen within 30 seconds.

32. Detach the D-fend and check that the message ‘Check D-fend’ appears onto the screen within 30 seconds.

Reattach the D-fend.

• Simulate at least 5 breaths by feeding calibration gas into the sampling line.

Check that the shown gas information is correct.

33. Check that the monitor activates the APNEA -alarm within 30 seconds after you have stopped feeding gas.

34. Switch the monitor off, disconnect the gas interface cable and clean the module.

• Fill in all necessary documents.

Document No. 800 1005-1

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3.3 Disassembly and reassembly

The airway module (G-AiOV) is disassem b led in the following way. See the exploded view.

1. Remove three screws from the rear panel.

2. Remove one thumb screw and one 5 mm cross recess screw from the bottom of the airway module case.

3. Slide the case rearward and detach it from the module.

4. Lift off the top protection cover.

The PVX board can be detached by pulling sideways after two tubes are disconnected from two valves.

The ACX measuring board can be detached by pulling sideways after a ribbon cable connector is disconnected and a tube is pulled off from pressure transducer.

5. Remove the bronze plate from the right side of the module by pulling it up.

6. To remove the gas mother board cover, remove two front panel screws from the side of the module, and the D-connector screws.

S/5 Airway modules

7. The front panel can be detached by removing three screws.

8. Tubing system plate with tubes and flow cassettes can be lifted off.

9. Fan can be lifted off after plastic pc board rail is detached.

Gas mother board is attached to the side of the module with screws. The ASX unit, the ACX measuring unit, and the O

two screws each. The pump and its magnetic shield can be removed from the chassis by unscrewing the two screws

beneath two springs at the port side of the pump. Damping chamber/filter case can be slid out of hooks. Reassembling is essentially reversing what was described above.

measuring unit are attached to the chassis with

CAUTION When reassembling the module, make sure that the tubes and cables are not

pinched between the boards and the cover.

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Datex-Ohmeda S/5 Anesthesia Monitor

3.4 Adjustments and calibrations

See

User’s Reference Manual

3.4.1 Gas sampling system adjustment

Flow rates should be measured and possibly adjusted under the following conditions:

• After any part within the sampling system has been replaced

• Gas response is slow

NOTE: Adjust the flows with a new, clean D-fend water trap and original Datex-Ohmeda sampling line.

NOTE: Before adjusting the flows, make sure that there is no leakage in the sampling system. NOTE: Let the monitor warm up for 30 minutes before measuring flow rates. For the flow rate measur ements a flowmeter with a low flow r esistance and capability to measure

low flow rates is required. A normal length of sampling line has to be connected to the monitor as it has a considerable effect on the flow.

for normal gas calibration instructions.

The flow rates are adjusted by changing the flow resistance cassettes (constriction cassettes) in the sampling system. See Table 2 in chapter “

The adjustments and the respective constrictions to be adjusted are shown in the next figure, see also chapter manufactured since autumn 1998.

“Gas sampling system”

3.4.2 Flow rate measurement

If any flow rates are not correct, first replace the D-fend water trap. Then recheck the incorrect flows before adjusting the flow rates.

The sampling flow rate is measured by a flowmeter at the sampling line. The rate should be between 180 and 220 ml/min.

The sampling flow rate is adjusted by changing the flow cassette which is located between the pump and the damping chamber.

Due to two different tubing layouts, if the described location does not contain a flow cassette, the sampling flow rate is adjusted by changing the flow cassette that is located between the pump and the sample gas out connector.

Gas sampling system”

to see gas sampling system block diagrams for modules

for the alternative cassettes.

Document No. 800 1005-1

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S/5 Airway modules

Figure 16 Gas sampling system adjustment chart

4 TROUBLESHOOTING

4.1 Troubleshooting chart

Trouble Possible Cause/Treatment

No response to breathing Sampling line or water trap blocked or loose, or improperly attached.

Water trap container full. Interface cable to monitor disconnected.

See chapter “

SENSOR INOP. message The temperature is too high, check fan and filter at the rear panel.

Communication error, check timeout and bad checksum values at the service menu. Check Airway Module connection cable and supply voltages. Check ACX measuring board.

xx ZEROING ERROR-message Gas zeroing failed. Condensation or residual gases are affecting zero measurement. Allow module to run

drawing room air for half an hour and calibrate again.

AIR LEAK-message Air leak in sampling system. Probably water trap or the sampling line is not attached properly. Gas zero

valve failure. Pump failure or gas outlet blockage. Supply voltage missing REPLACE TRAP-message Flow resistance increased due to residue built-up on water trap membrane. Replace the water trap. REBREATHING-message CO2 concentration in inspiratory air is too high. Possibly CO2 absorber in ventilator is saturated. Change

the absorber. OCCLUSION-message Sampling line or water trap is occluded. Water trap container is full. If occlusion persists check internal

tubing for blockages. Check the power supply voltages. SELECT AGENT-message No anesthetic agent is selected though delivery is started. Vaporizer valve is broken. Traces of cleaning or

disinfecting agent in the water trap container affecting the readouts. Replace the water trap. No response to any gas Sampling line, water trap, or internal tubing blocked or loose, or improperly attached.

Pressure valve malfunction. Pump failure. Supply voltage missing. Serial communication error. Check

those items. Sudden increase in gas display Measuring chamber contamination.

±15 V supply voltages missing.

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 response to all

gases (or abnormally low) or sudden occlusion warning

Random output (resembling noise)

Strong drift in all gases Leakage in the sampling line or internal tubing (especially in conjunction with too low readings).

No gas waveforms intermittently.

Pressure transducer failure. Exchange the ACX Measuring board.

Chopper motor timing pulses out of sync.

Chopper motor not running, motor faulty or connection loose.

Chopper motor driver transistor C-E open circuit or current limiter short circuit.

Exchange the ACX measuring board.

Gas waveforms are not shown during automatic zeroing, occlusion, or air leak. Check the monitor screen

for possible messages and proceed accordingly.

Gas sampling system troubleshooting

.”

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Datex-Ohmeda S/5 Anesthesia Monitor

4.1.1 Supply voltage troubleshooting

Trouble Possible Cause Treatment

“Gas module removed” No Gas module exists after turning the monitor on.

+5V lost Gas module CPU not running. Check Gas Interface

cable. Check +5V from module mother board and timeout value from module service page.

Random CO2 value.

or AA response.

No CO

Abnormal AA mixture messages and AA selections. “Unknown Agent” “Zero error” after zeroing “Calibrate Agent ID” “Sensor Inop”

“Continuous Occlusion” “Sensor Inop” Random curve trace and gas digit values(resembling noise). Pressure and flow curves extremely low.

CO2 value high. “Air leak” “Sensor Inop” Paw and Flow curves extremely high.

“Air Leak”-message remains on the screen. +15 V dirty lost Check voltage from module mother board X1 pin 3,

Fan stopped. +32 V lost Check the fuse on Gas interface board.

+5 Vdirty lost Check the IR lamp resistance (approximately 4

Ohm)and the lamp voltage (module mother board connectors X8 and X9) X8 = ASX lamp(i-models) X9 = ACX lamp

+15 V lost Check voltage from module mother board X1 pin 4,

X2 pin 1a, X3 pin 1a, X4 pin 9 and X5 pin 5.

-15 V lost Check voltage from module mother board X1 pin 2, X2 pin 2a, X3 pin 2a, X4 pin 6 and X5 pin 6.

X2 pin30a , X3 pin 30a, X4 pin 1 and X5 pin 13.

Check the fan and regulated fan supply voltage from module mother board connector X10.

“Calibrating gas sensor” remains on the screen.

Document No. 800 1005-1

One or more of the voltages lost: +5 Vdirty, +15 V,-15 V, +15 Vdirty

ACX measuring board not communicating with the Gas mother board.

ACX measuring unit badly contaminated.

Check those voltages as above.

Check whether the ACX software version is available in the service menu. If not, replace the ACX measuring board.

Replace the ACX measuring unit.

Page 55

S/5 Airway modules

4.2 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 pump aging or dirt accumulating in the internal tubing.

The following checks should help in localizing the fault. Whenever suspecting the sampling system and always after working on the sampling system check and if necessary adjust the flow rates.

The sampling system details are illustrated in figures 5, 6, 7 and 8.

CAUTION The special internal sample tube is mechanically fragile. Sharp bends will cause

leaks.

NOTE: D-fend water trap should be replaced when the OCCLUSION message appears during the monitor startup.

NOTE: If any liquid has entered the ACX-200 measuring unit due to water trap filter failure, contact Datex-Ohmeda technical services.

4.2.1 Sampling system leak test

Connect power cord and sampling line. Turn the power on and wait until the initialization is over.

1. Choose ACX service data page in the Gas unit service menu.

2. Connect a tube to the sample out connector and drop its other end into a glass of water.

3. Block the sample inlet, reference flow of the oxygen measuring unit, and the CO port that draws room air in. Wait for one minute. There should be less than 1 bubble per 10 seconds coming out of the tube. Bubble should not move upwards more than 11 mm per 30 seconds inside the tube. If it does, there is a leak between the pump and the sample out connector.

4. Perform leak test to the CO leakage is the same as above.

absorber by opening zero valve. The maximum permitted

absorber

CAUTION Do not turn the pump off while performing the leak test. Negative pressure in the

sampling system will suck water in the module.

4.2.2 Water separation

1. Dip the patient end of the sampling line into water quickly (about a half second) three times at 45 seconds' interval. After that drop the end into water and lift it up when the sampling line is totally filled with water.

2. Check that all the water goes into the trap container and not into the monitor.

4.2.3 Steam test for the special tubes

Choose Halothane as anesthetic agent and let the monitor sample room air. Then quickly feed air of 100 % relative humidity (for instance from a kettle in which you are boiling water) to the monitor. If the digital reading jumps as much as 0.1 % replace the special (Nafion) tubes.

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Datex-Ohmeda S/5 Anesthesia Monitor

4.3 OM measuring unit troubleshooting

Because of the complex and very sensitive construction of the oxygen measuring unit no repairs should be attempted inside the unit. Instead, if the fault has been found in the measuring unit itself, it should be replaced and the faulty unit be sent to Datex-Ohmeda for repair.

In cases of no response to O

or strong drift, check the tubing for loose connections, blockages and

leaks.

CAUTION Never apply overpressure to the O2 measuring unit as the pressure transducer may

be permanently damaged.

If the message ‘O2 zero error’ is displayed check the O2 measuring unit output voltage on Gas mother board (see Section Offset adjustment).

If the adjustment range of the (software) calibration is insufficient check the O

measuring unit

output voltage and adjust the gain if necessary (see Section Gain adjustment). If there are problems with O

response time check the O2 measurement flow rate and adjust it if

necessary (see Section Gas Sampling System Adjustments). If the O

signal is noisy, check the measurement unit suspension. Frequency adjustment may help

in some cases (see Section Frequency adjustment).

4.4 ACX troubleshooting

CAUTION The measuring unit ACX-200 can be repaired and calibrated only at the factory.

The ACX troubleshooting is carried out in the General Troubleshooting scheme. The ACX testing is explained at the ACX service information section, please refer to it.

4.4.1 Cleaning the measuring chamber of ACX measuring unit

In case the N2O “zero calibration constant” in Gas Service (ULT) or N2O “calib zero” in ACX Service (AM/CCM) indicates contamination of the measuring chamber (value 61000 or more), or if the software will stuck to the “calibrating gas sensor” state due to contaminatio n, it is possible to attempt the measuring chamber cleaning. However, Datex-Ohmeda recommend exchanging the measuring unit rather than cleaning.

The measuring chamber should first try to be cleaned by rinsing it with distilled water only. If rinsing alone is not sufficient the cleaning can be tried with Datex-Ohmeda Cleaning Fluid (85969).

NOTE: Do not use other cleaning agents such as blood gas electrode cleaners. These may damage the unit.

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Cleaning procedure

Tools needed

• 10 ml syringe

• water glass

• 2 pcs 30 cm silicon tubes with inner diameter of 3 mm

• screwdriver

1. Detach the measuring unit from the monitor or gas module.

2. Attach the silicon tubes to the tube connector on the unit.

3. Attach the 10 ml syringe to one of the tubes.

4. Place the tip of the other tube into the water glass.

5. Pour some distilled water into the glass.

6. Suck the water into the tubing with the syringe.

7. Leave for 15 minutes.

S/5 Airway modules

8. Move the syringe piston in and out 10 times.

9. Detach the tubes from the unit and empty the water from the measuring chamber.

10. Attach one silicon tube to the unit and connect the other end of the tube to the gas outlet of the monitor or gas module.

11. Switch the monitor on and let the sample out flow dry out the unit at least for 15 minutes.

12. Attach the unit back to the monitor or gas module and switch the monitor on.

13. Let the monitor run at least 30 minutes before checking the calib zero in the service mode.

14. If the zero value is still more than 61000, repeat the procedure with the cleaning fluid.

NOTE: After cleaning with the cleaning fluid the measuring chamber must be well rinsed with distilled water.

NOTE: The monitor will stay in “Calibr ating gas sensor” state u ntil the measuring chamber is completely dry.

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4.5 ASX agent identification unit troubleshooting

NOTE: Please read also troubleshooting section in

User’s Reference Manual

CAUTION The agent identification bench ASX-200 can only be repaired and calibrated only at

the factory.

Trouble Possible Cause/Treatment

AGENT MIXTURE-message when calibration gas (Freon) is fed.

No response from ASX. Communication between ASX unit and Central Unit is lost. ASX bench disconnected or faulty.

No identification

Is the ASX software on the software list on the service wiev?

Repeat calibration. If the module contains ASX-100, it is not capable to identify calibration gas R23, therefore the message. However, the ASX-100 will still calibrate with R23.

Check that the motor is running.

YES

Go to ASX se rvice view and check peak normal value

Is ASX motor running?

YES

Check Err status in Gas Mother board service page. Fault in serial communicat., ReplaceASX board or Gas Mother Board.

Check ASX unit supply voltages

Figure 18 ASX troubleshooting flowchart

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S/5 Airway modules

4.6 PVX board troubleshooting

CAUTION The measuring unit PVX-100 can be repaired and calibrated only at the factory.

NOTE: Never apply DIFFERENTIAL pressure higher than 25 cmH2O to the spirometry tubing. Make sure that both spirometry tubes are always connected.

NOTE: Never apply overpressure or negative pressure of more than 300 cmH

O to the spirometry

tubing.

No spirometry

Is the PVX software on the software list on the service view?

Check Err status in Gas Mother board se rvice page.

YES

Go to PVX service view

Figure 19 PVX board troubleshooting flowchart

NOTE: The PVX software string does not appear onto the list when using the combination of G-AOV module and monitor software S-___94.

4.7 Gas mother board troubleshooting

Due to the complexity of the LSI circuitry there are only a few faults in the CPU digital electronics that can be located without special equipment.

Check that the RAM, EPROM, CPU and other IC’s that are on the sockets are properly attached. See Gas mother board service pages for more information.

4.7.1 Instructions after replacing the software or Gas mother board

After replacing the software or Gas mother board:

• perform the sampling system leak test

• check the flow rates

• perform the gas calibration

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4.8 Error messages

Message Explanation

Occlusion The sample tube inside or outside the monitor is blocked or water trap is

occluded. If occlusion persists, measured gas values disappear.

Air leak - the water trap is not connected

- the gas outlet is blocked

- there is a leak in the sampling line inside the module. If air leak persists measured gas values disappear.

Replace trap Indicates residue build-up on the water trap membrane. This decreases air

flow. Zero valve error Opening the valve does not change working pressure enough. Gas calibration is not available during the first 5

minutes/during occlusion/during air leak Select agent No agent selected. Continuous occlusion. Check sampling line and water trap. Occlusion over 40 seconds. Air leak detected. Check water trap and sample gas out-flow.

Press normal screen to continue.

Calibration not allowed during the first 5 minutes after power up and in

mentioned situations.

Air leak over 40 seconds.

Zero error Unsuccessful zeroing Unstable Unsuccessful calibration CO2 over scale CO2 signal exceeds the maximum waveform area O

O2 zero error Unsuccessful zeroing O2 over scale O2 signal exceeds the maximum waveform area O2 Unstable Unsuccessful calibration N2O N2O zero error Unsuccessful zeroing N2O Unstable Unsuccessful calibration Ane agents AA zero error Zero error AA unstable Unstable AA over scale AA signal exceeds the maximum waveform area Menu messages during calibration Zero error Unsuccessful zeroing Adjust Calibration gas accepted and monitor is ready for adjusting the gas values

Unstable Unsuccessful calibration

Unsuccessful zeroing

Unsuccessful calibration

to match the calibration gas concentration

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5 SERVICE MENU

S/5 Airway modules

1. Press the Monitor Setup key.

2. Select

3. Select

4. Select

Install/Service Service

(password 26-23-8).

(password 16-4-34).

Parameters - Gas Unit

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Datex-Ohmeda S/5 Anesthesia Monitor

5.1 Gas mother board

Service Data

Oper State

Internal operation state of the module:

0...9 function performed, if staying on, failure is indicated

10...29 Initialization

30...39 Normal operation state

40...49 Zeroing

50...59 Calibrating

ERR status

Indicates measuring unit malfunction: GAS:

0 no error 1 error in ACX measuring system 2 error in ACX communication 10 error in ASX measuring system 20 error in ASX communication 40 error in PVX measuring system 80 error in PVX communication Possible failure source: Gas CPU, ACX, ASX or PVX.

ACX: 0 no error if not 0, replace ACX unit

ASX: 0 no error if not 0, replace ASX unit

PVX: 0 no error if not 0, replace PVX unit

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S/5 Airway modules

Serial Comm(unication)

Serial Communication indicates a state of serial communication between the module processor and a measuring unit.

GAS: FFFF Continuously ACX: FFFF Continuously ASX: Value is for factory use only. PVX: Value is for factory use only.

Rep status

Rep status is a four-digit number, where all digits, abcd , can have different values. Gas rep status:

a 0 No sevoflurane or desflurane measurement available 3 ACX can measure sevoflurane and desflurane

b 0 No gas measurements available F CO2, O2 N2O and AA measurements available 3 CO2 and O2 available

c 0 No ACX, ASX, nor PVX board running 1 ACX board running 3 ACX and ASX board running 5 ACX and PVX board running 7 ACX, ASX and PVX board running

d 0 Normal operation state 1 Occlusion 2 Air leak 4 Other sampling system error 8 Replace trap

ACX rep status: a empty Normal operation state 1 ACX initialization

b empty Normal operation state 2 Occlusion 4 Air leak

c C Normal operation state others values used in manufacturer's testing

d 0 Normal operation state others values used in manufacture's testing

ACX rep status FFFF continuously

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Datex-Ohmeda S/5 Anesthesia Monitor

PVX rep status FFFF continuously

General Status

0 Normal operation state 8000 Initialization

If not 0 or 8000, replace the gas mother board. Timeouts is a cumulative number that indicates how many times the module has not responded to

the monitor's inquiry. Bad checksums is a cumulative number that indicates how many times communication from the module to monitor broke down. Bad c-s by mod is a cumulative number that indicates how many communication errors the module has detected. The monitor starts counting these items at power up and resets to zero at power off. The nonzero values do not indicate a failure, but the continuous counting indicates either serial communication failure or module not in place.

The timeouts etc numbers should not grow faster than 50/s.

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5.2 ACX service menu

S/5 Airway modules

Pump ctrl Turns pump on/off Zero valve ctrl Turns zero valve on/off Pres valve ctrl Turns pressure valve on/off Noise Meas Noise measurement. Fall time Meas Fall time measurement.

Service Data

Fall time

Fall time indicates the response time of the measuring units. Select ‘Fall time meas’ from the menu. Notice that text ‘feed’ appears under each gas. Feed the calibration gas until ev ery ‘feed’ is replaced by ‘start’. Remove the sampling line quickly from the gas source.

Check that fall times are:

< 480 ms

< 360 ms

O < 360 ms

AA < 520 ms NOTE: The measurement can be performed only with the modules using module software 884295.

Noise measurement

, CO2 and N2O

Feed the calibration gas until the gas values are stabilized on screen. Start the measur ing by selecting ‘Noise meas’ from the menu. After 10 seconds stop measuring by reselecting ‘Noise meas’. Close the gas source. Noise values should be: O

< 100, CO2 < 20, N2O< 150.

Select halothane for anesthetic agent. Feed the room air until gas values are stabilized. Perform the noise measuring as above, the value should be < 20.

NOTE: The measurement can be performed only with the modules using module software 884295.

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Calib zero and gain

These values are calibration constants of zero and gain for each gas. The zero values may change at gas zeroing, the gain values a t gas calibration. When the monitor performs gas zeroing, the main software will write zero constants for the gases (CO

, N2O, AA, O2) to the ACX memory. If some dust (or water) has entered the measuring chamber,

zeroing of the gases require higher zero constants than before depending on the contamination level. If some gas requires higher value than 65536 the unit is not able to perform the zeroing and the message ‘XXX ZERO ERROR’ appears to the error list and the software recalls the previous zero constant for the concerned gas. If this happens at th e initial start up the soft ware will not pass the “calibrating gas sensor” state.

O zero point is very sensitive for the measuring chamber contamination. Therefore the zero

The N

constant of N

O can be utilized in observing the contamination level of the ACX measuring

chamber. The optimum value for the N 45000 indicating the ratio of 1:1 between the measuring and reference channel signals. The maximum acceptable value for the N maximum value that the main software is able to set is 65536.

Exp, Insp

Gas concentration value from the ACX measuring unit.

Pressures Ambient is the ambient pressure measured at the initialization. Work press is the internal pressure

of sampling system measured by the ACX measuring board pressure transducer. The difference between these two pressures is Amb-Work and if the pump is functioning, it should normally be within 50...75.

O zero constant with new and clean measuring chamber is

O zero constant is 51000, for a new measuring unit. The

OM(in-ref) is a pressure difference between the O

measurement flow and the O2 reference flow.

This pressure difference is automatically checked after every gas zeroing and it should be between 5 to 10 mmHg. If the pressure difference turns negative a message ‘Replace trap’ is displayed when the limit of -5 mmHg is exceeded.

In S-___97 and S-___98 software there is a software flaw in displaying the pres s ure differenc e, OM (in- ref). The flaw does not have any effect on the functioning of the ACX unit. The operational limit for the ‘Replace Trap’ message is -5 mmHg as in previous S W versions. The flaw is only in the displaying of the pressure difference value. With S-___97/98 software the pressure difference can be checked in a following way: turn the pressure valve ON for five seconds. This enables the updating of the OM (ref) value. Turn the pressure valve OFF and wait for five seconds. Now calculate the difference between Work press and OM (ref).

Pump, zero valve, and pressure valve are operated manually by highlighting and pushing the ComWheel. During patient monitoring, the valves are in OFF position

ACX temp indicates temperature inside the ACX bench, and the value is typically +10

°C higher

than the prevalent room temperature. Delays indicate the time delays within or between measurement units.

Delays are measured at the same time as fall times. Check that the ACX_ASX delay is between 400-800.

NOTE: The measurement can be performed only with the modules using module software 884295. Timeouts is a cumulative number that indicates how many times the module has not responded to

the monitor’s inquiry. Bad checksums is a cumulative number that indicates how many times communication from the module to monitor broke down. Bad c-s by mod is a cumulative number that indicates how many communication errors the module has detected. The monitor starts counting these items at power up and resets to zero at power off. The nonzero values do not indicate a failure, but the continuous counting (more than 50 per second) indicates either serial communication failure or module not in place.

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5.3 PVX service menu

S/5 Airway modules

Service Data

Aw Pres Zero...The value of airway pressure zero is changing within the range of 1000 to 2400. *) Aw Pres Gain...Gain of pressure measurement. This value should be fixed to 8662.

Flow Zero....The value corresponds to the pressure transducer B1 output during PVX zeroing.

Number 0 corresponds to 0 V and 4095 corresponds to 10 V. The value is typically within the range of 100 to 4000.

Insp Flow Gain...Gain of inspired gas volume. Typically the value is between 5000 and 9000 depending on which sensor is used (adult/pediatric).

Exp Flow Gain...Gain of expired gas volume. Typically the value is between 5000 and 9000 depending on which sensor is used (adult/pediatric).

*) Common Offset...Cancels common error which is caused by pressure from the pressure transducers. This is a transducer's own constant. The value should be between -230 and +230.

Valves...Position of zero valves.

Zeroing....Automatic zeroing is cancelled (disabled) or active (enabled).

*) NOTE: Items marked with asterisk (*) are not to be changed. NOTE: The shown values are for the Adult module only. Changing the mode does not change the

values.

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5.3.1 Flow calibration

Flow calibration

2. Enter service menu (

3. Enter the PVX menu. After the flow is zeroed (‘Zero OK’ message displayed) attach calibration pump or spirometry tester to the flow sensor (D-lite or Pedi-lite). Select the sensor type.

4. Set the calibration volume for adult to 1000 ml and for pediatric to 300 ml.

5. Work on the calibration pump slowly, approximately 1 pump in 5 seconds, pump until ‘adjust’-message appears. If you use the spirometry tester, perform the calibration according to the tester instructions.

6. Adjust the reading to match the calibration volume (1000 ml for the D-lite and 300 ml for the Pedi-lite).

NOTE: The last calibration dates are saved into the main CPU board memories.

Monitor Setup

- Install Service - Service - Parameters

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5.3.2 Temp & Hum service menu

If circumstances noticeably differ from normal, or additional accuracy is required, the use of Temp & Humidity menu may be advisable.

S/5 Airway modules

Especially small errors in tidal values may indicate that temperature and humidity settings of the monitor differ too much from the used system.

Room Temperature and Humidity

These are needed only in calibration procedure.

Insp Temperature

The setting regarding the temperature of inspired gas. The value is used in calculations. Change if necessary.

Insp Humidity The setting regarding the humidity of inspired gas. The value is used in calculations. Change if

necessary.

Exp TemperatureThe setting regarding the temperature of expired gas. The value is used in calculations. Change if

necessary.

Exp Humidity The setting regarding the humidity of expired gas. The value is used in calculations. Change if

necessary.

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5.4 ASX service menu

NOTE: The ASX service menu in monitor software S-xxx94 or newer supports only modules equipped with the ASX-200.

Service Data

ID result displays the identified gas or mixture Total % is the anesthetic agent concentration measured by ASX bench. Rel % is the relative percentage of each measured agent in the mixture. Noise value should be less than 80. Check the value only when no gas is fed and after a minimum

of one minute stabilization time. Temp C is the temperature inside the ASX unit.

AGC (Automatic Gain Control) should be between 100 and 3500. Motor DAC is a motor speed control voltage, 100...3900, and Motor Fluct is the speed

fluctuation, should be < 200. Alc comp val is the compensation factor for alcohol content measured during halothane, enflurane

or isoflurane measuring. Sta shows the status of compensation, 0 means off, and 1 means on. The value without a leading text is for factory use only. Peak normal, Peak mirror give the place of the spectrum’s peak in the channel numbers. The peak

normal value should be 10.3- 10.7 with calibration gas R23, and 12.9-13.1 with R22. If the value is not within the range, the gas calibration must be performed (see User’s manual for instructions).

Time offset is the time between motor synchronization pulse and filter 0° angle. Fact is the factory value for it, EEPRO is the user calibration result, stored in the ASX, and RAM is the user calibration result, stored in the gas mother board.

Spectrum values tell about the scales o f the spectrum display.

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6 SPARE PARTS

6.1 Spare parts list

NOTE: Only changed part numbers are listed under later revisions. To find the desired part: check first the list of the revision that corresponds your device. If the part is not listed there, check the previous revision, etc. until you find the right number.

S/5 Airway modules

6.1.1 G-AO rev. 01, G-AiO rev. 00

Item Item description Order No.

- Block screw for cables 546096

- Nafion tube (A or B, 500 mm: see manual) *733383

- Nafion tube (C, 300 mm) *733382

- Spring for D-Fend 875598

- Membrane keypad, G-AO / G-AOV 879371

- Thumb screw, AS/3 Airway Module 879511 3 Case, Airway module 878864 4 Fan 880049 6 ACX-200 measuring board *880270

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Item Item description Order No.

7 Cover, top protection 878859 8 Latch for flow cassettes 880343 9 Valve, zero 58534 10 Valve, pressure *58534 11 Internal sampling tubings incl. system plate *880375 12 CO2 Absorber, Airway Module *880067 13 Damping chamber / Filter 880068 14 Gas mother board, G-AO / G-AiO *(880352) Use 885174 19 Plug, tube connector 880294 20 Front panel unit, G-AO (880374) Use 887477 20 Front panel unit, G-AiO (881116) Use 887477 21 Lamp, ASX-100/200 *878756 22 ASX-100 agent identification unit *881107 23 O2 measuring unit *(872898) Use 888511 24 Grommet for tubes 65094 25 Sample pump, (Airway module) AS/3 spare part *(881298) Use 896238 26 ACX-200 measuring unit *879849 27 Connector, sample gas out 871981 31 Cross recess screw M6x16 61678 32 Bushing, AS/3 Airway Module 879512 40 Fitting plate, G-AiO / G-AiOV / G-O / G-OV 880550

6.1.2 G-AO rev. 02, G-AiO rev. 01, G-AOV rev. 00, G-AiOV rev. 00

Item Item description Order No.

14 Gas mother board, G-AOV / G-AiOV *(881775) Use 885174 20 Front panel unit, G-AOV (880374) Use 888292 20 Front panel unit, G-AiOV (881116) Use 888292 28 PVX-100 without software *881444 29 PVX tubings 882723 30 PVX board support 880435 37 Repair set for spirometry connectors, AS/3 *886978

6.1.3 G-AO rev. 03, G-AiO rev. 02, G-AOV rev. 01, G-AiOV rev. 01

Item Item description Order No.

14 Gas mother board, AS/3 Airway module *885174 35 EMC cover, Gas mother board 884116 33 Bronze plate 884117 34 Insulation plate for 884116 879914

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S/5 Airway modules

6.1.4 G-AO rev. 04, G-AiO rev. 03, G-AOV rev. 02, G-AiOV rev. 02, G-O rev. 00, G-OV rev. 00

Item Item description Order No.

- OM reference filter 86901

- Cable tie 64001 20 Front panel unit, G-AO (885280) Use 887477 20 Front panel unit, G-AiO (885281) Use 887477 20 Front panel unit with metal SSS -connectors, AS/3 888292 20 Front panel unit w/o SSS -connectors, AS/3 887477 22 ASX-200 agent identification unit *882718 23 O2 measuring unit *888511 29 PVX tubings 885867 36 Grounding spring 885602 38 Spirometry connector, short male 886636 39 Spirometry connector, short female 886638

6.1.5 G-AO rev. 05, G-AiO rev. 04, G-AOV rev. 03, G-AiOV rev. 03, G-O rev. 01, G-OV rev. 01

Item Item description Order No.

3 Case, Airway module, white 893258

* this part is recommended for stock

NOTE: In case only the plastic spirometry connectors need repair, or compatibility with adult & pediatric Patient Spirometry accessories is needed, the Repair set for spirometry connectors, order number 886978, is recommend to be used.

The Front panel unit, order number 888292, does not contain a membrane keypad, fitting plate and small front panel sticker. Those should be added separately according to the Airway module type and revision. The Flow cassette’s and their order numbers can be found listed in the section Gas sampling system.

6.1.6 S/5 G-AO rev. 06, G-AiO rev. 05, G-AOV rev. 04, G-AiOV rev. 04

Item Item description Order No.

3 Case, Airway Module, S/5 white 898318

6.1.7 Panel stickers

Rear panel sticker set, item No. 1

Adaptation all modules

Order No.

All 894181

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Datex-Ohmeda S/5 Anesthesia Monitor

Front panel sticker (small), item No. 17

Adaptation G-AO, G-AOV

Order No.

-23- (Eng) 880376 880471

-26- (Fin) 888876 880471

-31- (Jpn) 888313 880471

-33- (Ger) 880546 880471

-40- (Spa) 884405 880471

-41- (Swe) 885843 880471

-42- (Dnk) 892221 880471

-43- (Fre) 880454 880471

-44- (Dut) 886065 880471

-46- (Ita) 886760 880471

-47- (Nor) 893574 880471

-48- (Por) 895256 880471

Front panel sticker (large), item No. 18

Airway Module Order No.

G-AO 880377 G-AiO 880472 G-AOV (rev. 00-01) 880472 G-AOV (Jpn) 888314 G-AOV (rev. 02) 886980 G-AiOV (rev. 00-01) 881301 G-AiOV (rev. 02) 886981 G-AiOV (rev. 02, Jpn) 890710 G-O 885233 G-OV 886972 G-OV (Jpn) 890712

other modules Order No.

6.1.8 S/5 panel stickers

Rear panel stickers, item No. 1

Adaptation all modules

Order No.

All 8000246

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Front panel sticker (small), item No. 17

S/5 Airway modules

Adaptation S/5 G-AO, G-AOV

Order No.

DA 8000202 8000204 DE 8000193 8000204 EN 8000192 8000204 ES 8000196 8000204 FI 8000199 8000204 FR 8000194 8000204 IT 8000197 8000204 JA 8000389 8000204 NO 8000201 8000204 NL 8000195 8000204 PT 8000198 8000204 SV 8000200 8000204

Front panel sticker (large), item No. 18

Airway Module Order No.

G-AO 8000203 G-AiO 8000205 G-AOV 8000208 G-AOV (Jpn) 8000390 G-AiOV(Jpn) 8000391

other modules Order No.

6.1.9 Planned Maintenance (PM) Kits:

Airway Module, G-xxx Order No.

all versions 8001762

6.1.10 Gas Interface Board, B-GAS

Item Item description Order No.

- Fuse T4A 250V *51134

- Grounding plate 885404

- Block screw for cables 546096

* this part is recommended for stock

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7 EARLIER REVISIONS

This manual supports all the other Airway Module revisions except the following ones. For further information on those revisions see corresponding manual.

Revision Manual slot/main manual Note

G-AO Module revision 01 G-AiO Module revision 00

G-AO Module revision 02 G-AiO Modules revision 01 G-AOV Module revision 01 G-AiOV Module revision 01

G-OV Module revision 01 G-O Module revision 01

Service Manual p/n 880850

Service Manual p/n 882580

Technical Reference Manual 885944-6/896624

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APPENDIX A, Service check form, S/5 Airway modules

APPENDIX A

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Datex-Ohmeda S/5 Anesthesia Monitor

Document No. 800 1005-1

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SERVICE CHECK FORM S/5 Airway modules

Customer

APPENDIX A, Service check form, S/5 Airway modules

Service Service engineer Date

OK = Test OK N.A. = Test not applicable Fail = Test Failed

All modules

OK N.A. Fail OK N.A. Fail

1. Internal parts 2. External parts

2. D-fend O-rings 3. OM ref. filter

Notes

5. Fan

6. Module soft ware

Gas Unit

Module type S/N

ACX PVX ASX

7. Module bus communication

8. N2O calibration zero < 61000

9. Ambient pressure 9. Special tubes

10. CO2 absorber > 3

11. Zero valve 10. Leak test

12. Sampling pump > 109 mmHg

8. Membrane key

Document No. 800 1005-1

A-1(3)

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Datex-Ohmeda S/5 Anesthesia Monitor

16. Flow rates Sampling flow

180-220 ml/min

Side flow 10-27 ml/min

O2 meas. in flow 45-60 ml/min

O2 ref. in flow 25-42 ml/min

CO2 absorber flow 180-220 ml/min

17. Pressures

Amb-Work

50-75 mmHg

OM (in-ref) > 4 mmHg

18. O2 sensor output voltage min. 2800 mV

OK N.A. Fail

19. Gas calibration

20. Fall time measurement

fall time < 360 ms

O2 fall time < 480 ms

N2O fall time < 360 ms

AA fall time < 520 ms

21. Noise measur ement

noise < 20

O2 noise < 100

N2O noise < 150

AA noise < 20

AA ID option

22. ACX_ASX Delay 400-800 ms

23. Peak normal and Peak mirror

Peak normal

10.30-10.70

Difference ±0.30

A-2(3)

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APPENDIX A, Service check form, S/5 Airway modules

OK N.A. Fail OK N.A. Fail

24. Calibration gas I.D.

Notes

Patient spirometry option

25. Spirometry connectors 26. Spirometry leak test

26. Flow waveform 27. Spirometry tester

Notes

All modules

29. Fan filter 30. Electrical safety check

30. Occlusion detection 31. Air leak detection

31. Apnea detection 32. Final cleaning

Notes

Used spare parts

Signature

A-3(3)

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A-4(3)

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Datex-Ohmeda S-5 Service Manual S5 Airway

Specifications and Main Features

Frequently Asked Questions

User Manual

Datex-Ohmeda

Technical Reference Manual Slot

Document No. 800 1005-1

June 2001

Table of contents

TABLE OF FIGURES

INTRODUCTION

1 SPECIFICATIONS

2 FUNCTIONAL DESCRIPTION

3 SERVICE PROCEDURES

3.1 General service information

3.2 Service check

All modules

4 TROUBLESHOOTING

5 SERVICE MENU

Flow calibration

6 SPARE PARTS

7 EARLIER REVISIONS

APPENDIX A