NORTH AMERICAN DRÄGER Vamos User manual

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Vamos

Variable Anesthetic Gas Monitor

Technical Documentation

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Contents

Function Description

1 Introduction 7

1.1 What’s what? .......................................................................................... 7

1.2 Screen content ........................................................................................ 8

1.3 Operating modes .................................................................................... 9

2 Operating concept 9

2.1 Power-up behavior ................................................................................ 10

2.2 Alarms ................................................................................................... 10

2.3 Menu structure .......................................................................................11

2.4 Simplified Vamos block diagram ........................................................... 12

3 ILCA patient gas module 13

3.1 Patient gas module structure ................................................................ 14

3.2 Sensor head function ............................................................................ 15

3.3 Sensor head operation ........................................................................ 20

3.4 Measured value units ............................................................................ 21

3.5 Pneumatic system ............................................................................... 22

3.6 Tubing ................................................................................................... 22

3.7 Pump .................................................................................................... 23

3.8 MOPS PCB ........................................................................................... 24

3.9 AMO FLOW ILCA PCB (flow controller) ............................................... 26

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For internal use only. Copyright reserved.

6494.340 Vamos Contents 2

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Contents

4 AMO O2 GRAF PCB 29

5 VAMOS PCB 31

6 SpO2 PCB 32

7 Screen 32

8 Water trap 32

9 Desktop power pack 33

10 Starting the release mode 34

10.1 Screen content release mode ............................................................... 35

10.2 Entering the release code ..................................................................... 35

Service Mode

1 Starting the service mode 37

1.1 Explanation of screen content .............................................................. 38

Repair Instructions

1 Service strategy 39

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2 VAMOS service programs 40

2.1 Download program ............................................................................... 40

2.2 VISIA program ...................................................................................... 40

For internal use only. Copyright reserved.

6494.340 Vamos Contents 3

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Contents

3 Repair information list 41

4 Hardware configuration of VAMOS 42

4.1 Repair components ............................................................................... 44

5 ILCA 45

5.1 Electrical data of ILCA sensor head ..................................................... 45

5.2 Pneumatic system ................................................................................ 48

5.3 AMO FLOW ILCA PCB ......................................................................... 50

6 Options 51

6.1 Optional battery .................................................................................... 51

6.2 SpO2 option .......................................................................................... 52

7 Alarms and their meaning 53

7.1 Behavior of Vamos in case of alarms ................................................... 53

7.2 General alarms ..................................................................................... 54

7.3 SpO2 measurement alarms .................................................................. 54

7.4 Gas measurement alarms .................................................................... 57

8 Vamos disassembly 61

8.1 Housing rear panel disassembly ........................................................... 61

8.2 Basic frame disassembly ...................................................................... 62

8.3 ILCA module disassembly .................................................................... 63

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8.4 PCB-set disassembly ............................................................................ 65

8.5 VAMOS PCB disassembly .................................................................... 68

8.6 ILCA sensor-head disassembly ............................................................ 68

8.7 Pump disassembly ................................................................................ 69

For internal use only. Copyright reserved.

6494.340 Vamos Contents 4

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Contents

Software download

1 Software download (PGM or MFM software) 70

1.1 Software download precautions ............................................................ 70

1.2 Test Equipment ..................................................................................... 71

1.3 Typographic Conventions ..................................................................... 71

1.4 Software Download Procedure ............................................................. 72

VISIA program

1 VISIA program description 79

1 Error list to function blocks 82

1.1 Monitor .................................................................................................. 82

1.2 Rechargeable battery ........................................................................... 83

1.3 Measured value display ........................................................................ 85

1.4 Text display ........................................................................................... 88

1.5 Menu ..................................................................................................... 89

1.6 Keys ...................................................................................................... 93

1.7 Control knob ......................................................................................... 94

1.8 LEDs ..................................................................................................... 95

1.9 Acoustic signal ...................................................................................... 96

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1.10 Serial communication ........................................................................... 97

1.11 Processor .............................................................................................. 97

1.12 Software ................................................................................................ 98

1.13 Fan ........................................................................................................ 99

For internal use only. Copyright reserved.

6494.340 Vamos Contents 5

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Contents

Schematics and Diagrams

1 VAMOS block diagram 100

PMS

1. Unit, general 101

2. Spare parts used 102

3. Safety Checks 103

4. Test items 106

5. Supply unit to customer ready for operation. 111

6. Confirmation of test 111

7. These steps are regarded as repair work and are therefore not included in the inspection service price. 111

8. Annex 112

Installation instructions 114

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Spare parts list 118

For internal use only. Copyright reserved.

6494.340 Vamos Contents 6

Function Description

1 Introduction

1.1 What’s what?

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5 4

Vamos

812

Key to front view

1 Screen 5 Indicator lamps for alarm

2 Central control knob for selection and

confirmation

3 Standby Key 7 Water trap WaterLock

4 Key for silencing the alarm sound for

2 minutes

6 Power indicator lamp

Mains voltage = green Battery operation = yellow

8 Connection for sampling line

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9 10 11 12 13 14

Key to rear view

9 ON/OFF switch 13 "SpO2" connection for SpO2

sensor

10 "15 V DC" connection for desktop power

pack

11 Connection for RS 232 interface

(Medibus)

12 Connection for RS 232 interface

1.2 Screen content

115

CO2

Fet

N2O

[%]

0.0

Hal

[%]

14 Outlet for sampling gas

scavenging or return line

15 Handle

SpO2HR0

♥

0.0

CO2

[mmHg]

Key to possible screen content

1 Alarm window 8 Window for real-time curve

2 Status window 9 Displayed parameter

3, 4, 5,

Parameter window 10 Scaling of real-time curve

6, 7

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1.3 Operating modes

The operating modes of Vamos are defined as follows:

Measuring

The measured values of the sensors are displayed on-screen.

mode:

Standby: Vamos is switched on. No measured value is shown on the

screen, but the following message:

”Standby” ”Software XX.XX” (XX.XX = MFM software version)

The light in the standby key should come on. In "Standby" mode the pump of the ILCA module is off.

AC mains supply operation:

Battery operation:

Vamos is in standby mode or in measuring mode and is powered from the desktop power pack. The power-on indicator light should turn green.

Vamos is in standby mode or in measuring mode and is powered from the internal rechargeable battery (optional). The power-on indicator light should turn yellow.

Charging mode: The optional internal rechargeable battery is charged from the

desktop power pack.

No operation: None of the above operating modes is active.

2 Operating concept

The central control element is the control knob on the front plate. The control knob has two functions:

− Rotate = select/set

− Press = confirm

The two buttons on the front plate have the following functions:

− Button to silence the alarm for 2 minutes.

− Standby key.

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2.1 Power-up behavior

1. All LEDs are actuated.

2. Bleeps and screen test

3. LEDs are actuated one after the other. LED sequence: Standby, silence, advisory,

alarm, standby.......

4. Standby screen

2.2 Alarms

Vamos classifies alarm signals into three priorities, identified by up to three different exclamation marks. Alarm messages with a higher priority supersede those with a lower priority.

Alarm priority Alarm tone LED

Alarm = !!! (highest priority) intermittent The red (top) LED

flashes accompanied by a tone sequence at

2.5-second intervals.

Caution = !! (medium priority) intermittent The yellow

(bottom) LED flashes accompanied by a tone sequence at 30-second intervals.

Advisory = ! (lowest priority) once The yellow

(bottom) LED comes on accompanied by a single tone.

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2.3 Menu structure

--->

Alarm

Agent

CO2

SpO2

Sound

Language

CO2 --->

Unit mmHg

kPa

Range

0-110

0-75

Vol%

Alarm --->

FiCO2

EtCO2

FiHal

50.0

1.5

5.0

---

SpO2

Pulse

---

12050

--->

Hal

Enf

Iso

Sev

Des

Agent

Sound --->

Pulse 0

Alarm 1

Language

--->

SpO2 --->

Slow

Fast

Normal

Mode

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Param.

Cal

Config.

Parameter

Gases

SpO2

Fig. 1: Vamos menu structure

--->

off

Config.

Brightn.

Medibus

(Baud)

1200

9600

19200

high

low

--->

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2.4 Simplified Vamos block diagram

ON/OFF

Desktop

power

pack

RS 232

Medibus

RS 232

SpO2

Sensor

Gas outlet

Rear

PCB

SpO2

RS 232

1.5 KV

RS 232

1.5 KV

RS 232

ILCA

12 V battery (option)

Horn

VAM OS PCB

15 VDC

Charge

PCB

Front

Indicator lamps (LEDs)

Control Knob

Keys

Screen

BUS

Water trap

Fan

Fig. 2: Vamos block diagram

The ILCA patient gas module has no automatic anesthetic detector. The anesthetic being used must be specified by the user. Only one anesthetic may be used at any one time. The ILCA patient gas module conforms to the accuracy specified in the ISO standard.

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3 ILCA patient gas module

unit

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ON/OFF switch

(4 kV separation)

Ext. power supply

Only the components

SpO2 sensor

RS232 - PC

RS232 - Medibus

Screen

Control Knob

Keypad with status LEDs

SpO2 PCB

1,5 KV separation SpO2

Water trap

Sampling gas scavenging line

Valve

Pump

filter

Particle

ILCA sensor head

module.

belong to the ILCA

inside the dashed line

(optional)

Battery with

charging circuit

VAMOS PCB

AMO O2 GRAF PCB

ILCA

AMO FLOW ILCA PCB

AMO ILCA PCB

Fan

(monitored)

POWER

RS232

1,5 KV separation

MOPS PCB

Fig. 3: ILCA patient gas module components in Vamos

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3.1 Patient gas module structure

The ILCA patient gas module comprises the following components:

− Sensor head (electronics and optical system)

− Pump

− Valve

− AMO ILCA PCB (AMO = adapter for MOPS PCB)

− AMO FLOW ILCA PCB (flow controller)

− MOPS PCB (with PGM software, PGM = Patient Gas Module)

− AMO O2 GRAF PCB (with MFM software, MFM = Multi Function Module)

− PCB mounting frame

Sensor head

Val ve

MOPS PCB

Mounting frame

AMO FLOW ILCA PCB

AMO O2 GRAF PCB

Pump

AMO ILCA PCB

Fig. 4:

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Components of the ILCA module

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3.2 Sensor head function

Light emitter

éù_éù_

22 Hz

Patient

gas

ILCA

Sensor

head

Cuvette

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NTC

(FET)

Heater

Pressure

sensor

BASE PCB

EEPROM

Control signals

4-channel

VV PCB

(Pre-amplifier)

8-channel multiplexer

Track & Hold

8-channel A/D converter

detector

1st pre-

amplifier

2nd preamplifier

Data

Light emitter

control

(AMO ILCA

PCB)

Pressure

Temperature

measurement

and control

MOPS PCB

AMO ILCA PCB

Data

Control signals

Fig. 5: Sensor head block diagram

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The hardware of the ILCA sensor head comprises the following three PCBs:

VV PCB: − 1st amplifier for all channels of the four-channel detector

including high/low pass combinations and EMC configurations.

BASE PCB: − 2nd amplifier for all channels of the four-channel detectorLight

emitter actuation, temperature control, absolute pressure measurement, AD converter, multiplexer, serial EEPROM.

AMO ILCA PCB

− Generation of the supply voltages

− Digitally adjustable voltage for the light emitter via the

MOPS PCB.

− Heating voltage

− Supply to ILCA

Fig. 6:

− and setpoint setting for the sensor head heating (digital

potentiometer).

− Data transport: ILCA sensor ↔ MOPS PCB for data evaluation

Sensor head, sectional view

108

Key to sensor head sectional view

1 Light emitter (infrared range) 6, 7 PCBs

2 Reflector 8 Cuvette heating (FET)

3 CaF

disc of light emitter 9 Pressure sensor

4 Cuvette 10 Cuvette inlet and outlet

5 Multispectrum detector

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3.2.1 Light emitter with reflector

The reflector is ellipsoid in shape. The light emitter is positioned at the vertex of the ellipsoid. As a result, a beam is directed at an angle of incidence of < 12° onto the opposite detector.

The emitting element of the light emitter is a filament made of resistor wire. The alloy comprises Cr, Ni, Al. The filament wire is 40 µm thick.

In the assembled sensor, the reflector with built-in light emitter is encapsulated away from the interior of the sensor head by a CaF

disc. This design prevents sampling

gas from reaching the hot light emitter, and igniting oxygen and the anesthetic, in the event of a leak in the cuvette. Furthermore, any gaseous substances emitted by the hot light emitter are kept away from the cuvette. This avoid an undesired coating on the optical components as a result of prolonged use.

3.2.2 Light emitter specification

Cold resistance Rc = 13.0 ohms ± 11%

Hot resistance Rh = 13.0 ohms * 1.06 = 13.78 ohms ±11%

Peak output = 290 mA * 290 mA * 13.78 ohms = 1.16 W

3.2.3 Light emitter control circuit

The light emitter is operated with a square-wave modulated constant current of 290 mA at 22.0 Hz.

This light emitter current is measured with an AD converter (shunt resistor

0.5 ohms ± 2%) and monitored by the software of the MOPS PCB.

The supply voltage of the light emitter control circuit is also monitored by AD converter and voltage divider. The setpoint is set via a digital serial potentiometer controlled by the MOPS PCB.

The supply voltage is measured when the light emitter is off (low phase of light emitter modulation).

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3.2.4 Light emitter protection circuits

When the connection between the MOPS PCB and the BASE PCB is interrupted, a protection circuit immediately shuts down the light emitter.

A protection circuit also prevents the average light emitter current from exceeding 81 mA (tolerance = 3%) in the event of a fault (e.g. software crash). The response time (t

A) of the protection circuit is 65 ms ± 15 ms. This condition applies when the

light emitter was previously off and is then switched to continuous current.

3.2.5 Cuvette

Notice:

Do not generate an excess pressure in the cuvette.

The sampling gas is routed through a cuvette in the sensor head. In the optical beam path it is sealed on each side by a bonded-in CaF2 glass window pane. The gas inlet and outlet form the two connectors. The direction of flow of the sampling gas is indicated by arrows on the housing adjacent to the connectors.

For absorption reasons the distance between the light emitter window and the detector window is 6 mm.

3.2.6 Multispectrum detector

In the multispectrum detector the optical beam path is distributed across the four measuring channels and routed to the relevant detector chip by infrared narrow-band filters.

The optical beam enters the multispectrum detector through a hermetically sealed window. On the floor of its housing is a matrix-style array of four-sided reflective pyramids with a side length of 0.15 mm x 0.15 mm (beam splitters). The optical beam entering through the window hits this beam splitter and is split by each individual pyramid in pixel style into four separate beams. The pixel-style design results in a genuine beam mix, which is insensitive to partial contamination in the beam path. The housing also contains four infrared optical narrow-band filters and four pyroelectric detector chips. These components are arranged such that one infrared filter detector combination is illuminated by each of the four beam paths emitted from the beam splitter. Each of the four beam paths represents a measuring channel. The basic design of the multispectrum detector is shown in the following diagram:

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Sensor window

Light beams

Infrared filter

Anesth. gas

Ref.

Sensor chip

Beam splitter

Fig. 7: Basic design of the multispectrum detector

The infrared optical filters (band-pass filters) are dimensioned in terms of their wavelength such that light is transmitted in three channels at the wavelength of the sampled gases. The remaining spectrum is blocked by these three filters. When a gas is present light is absorbed and the resultant change of intensity measured in the respective channel is a measure of the concentration of the gas.

The fourth channel (reference channel) measures at a wavelength at which none of the sampled gases absorbs. With the reference signal, ambient influences such as temperature fluctuations, cuvette contamination, and light emitter aging are compensated and corrected.

The detector elements and the upstream filters are tilted 30°. As a result, the reflected beam strikes perpendicular to the filter plane and the detector plane.

3.2.7 Pressure sensor

The ILCA sensor head delivers its measured values as partial pressures or as the non-pressure-dependent unit vol.%. Fluctuations in cuvette pressure have no effect on the measured values. An absolute pressure sensor measures the pressure in the cuvette and, where appropriate, the ambient pressure (e.g. during zeroing).

The pressure measurement is fast enough to represent fluctuations in respiratory pressure (T

better than 200 ms).

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Measuring range:

The sensor head is able to measure at ambient pressures between 670 mbar and 1100 mbar. For the measuring range of the pressure sensor it should be considered that the pressure in the cuvette may be as much as 200 mbar below ambient pressure (vacuum in the suction system).

3.2.8 Sensor heating (FET)

An insulated power FET which is screwed onto the cuvette is used for temperature stabilization of the cuvette (setpoint temperature 58 °C). The drain source resistor of the FET is controlled via a control voltage and is used as sensor heating. The current that flows through the FET determines the heating output with the voltage drop across the FET.

The setpoint of the temperature is specified by the MOPS software. The microcontroller on the MOPS PCB control a digital potentiometer located on the AMO ILCA PCB power module. Its output voltage is routed to the FET via an impedance converter. The temperature is monitored by an NTC.

3.2.9 Memory for calibration data

All calibration data, serial numbers, and settings required to operate the sensor head are stored in an EEPROM on the Base PCB in the sensor head.

3.3 Sensor head operation

The sensor head attains its full accuracy when it has reached its operating temperature and a stable temperature distribution. The time from power-on until ready-to-measure is determined by the duration of the warm-up phase. The warm-up phase is dependent on the temperature distribution when the sensor is powered up. The sensor software optimizes the starting behavior. In the worst case the sensor head attains its specified accuracy no later than 4 minutes after power-on.

3.3.1 Self test

The sensor head software performs a self-test when the system starts up and continuously during measurement operation. In the event of an error the sensor software generates the relevant status message and shuts down the system if necessary.

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3.3.2 Zeroing

The measurement signals of the sensor head may drift over a lengthy period in operation (due to aging, temperature fluctuations, etc.). Contamination of the cuvette can also impair signal intensity. Consequently, a reset to zero is performed on completion of the warm-up phase and then every 2 hours. Ambient air (as reference gas) is present in the cuvette during zeroing.

During operation, system states may occur (such as sudden contamination of the cuvette) which necessitate an additional zeroing. The sensor software detects such states automatically.

3.4 Measured value units

The measured values of the ILCA sensor head are produced from the measured values in the cuvette. There is no conversion to the conditions at other points in the system, such as in the Y-piece or the patient’s lung.

3.4.1 General remarks on the concentration figures

The concentration of the anesthetics is calculated by referencing the measured partial pressures of the gas components to the overall pressure in the cuvette.

The concentrations can be scaled in two different ways. As a physical unit, the standard representation is in percent by volume [vol.%], i.e. referred to 100%.

Conversely, for some gases medical experts apply a reference to 760 Torr. This figure in a pressure unit is not a pressure, however, but a concentration, and must not be confused with a partial pressure!

The concentrations are converted from vol.% to Torr as follows:

100 Vol.% = 760 "Torr"

1 vol.% * (760 /100 Torr/vol.%) = 7.6 Torr 1 Torr * (100/760 vol.%/Torr) = 0.1316 vol.%

It is essential that this conversion of the concentrations should be distinguished from conversion of the pressures!

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3.5 Pneumatic system

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Sampling gas

Te fl on tube

Valve

Ambient air

135 mL

15 mL

ILCA

Sintered filter

C1 damper

(buffer volume)

MOPS PCB

Diaphragm pump

AMO FLOW ILCA PCB

Fig. 8: ILCA pneumatics diagram

The pneumatic system of the ILCA module comprises the following components:

− A DC diaphragm pump

− A valve

− An "AMO FLOW ILCA PCB"

Ambient air

− A pneumatic low-pass filter, at least one filter, and the associated anesthetic-

resistant tubing

− A water trap and a Teflon hose

3.6 Tubing

The pressure surges generated by the pump are minimized by a pneumatic low-pass filter consisting of a restrictor (R1) and a damper (C1). These components are mounted in the module housing of ILCA.

Dimensioning of R1:

R1 is small enough for the pump not to be placed under unnecessary strain. However, an inadequate input load may make it impossible to set the target flow of 150 mL/min.

R1 is large enough so that the pressure surges occurring in the cuvette do not impair the signal ratio and noise ratio in gas sampling.

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Dimensioning of R2:

In a zeroing operation, the valve switchover is also tested based on the pressure drop. In this case the pressure drop via the restrictor R2 and the ambient air filter is significantly less than the minimum pressure drop via the water trap and the suction tubing to the patient.

3.7 Pump

The pump flow is 150 mL/min ± 20 mL/min. The supply voltage is in the range from

2.5 V to 7.5 V DC at a current of up to 150 mA.

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3.8 MOPS PCB

Components (ILCA, AMO FLOW ILCA PCB, etc.)

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ports

Component

ASIC

I/O

TPU

EEPROM

68332

Motorola

Distribution across ports

switch

Data

Addr.

SCI

Electrical

RAM

isolation

A/D

RS232

Voltages

5 V, 6.4 V, 15 V

PCB voltages

15 VDC (ILCA)

Module voltages

Flash EPROM

Supply

voltage

MOPS PCB

VAM OS PCB

Fig. 9: Block diagram, MOPS PCB

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“"MOPS" stands for "Modular Platform for Sensors". A modular concept by which suitable sensor components (pneumatic and mechanical components) can be operated together by way of a processor board. The resultant arrangements are operated by a software program with a unified communications interface. In this way, the user is provided with a uniform view of the measurement parameters on offer, irrespective of the components deployed. The software is automatically configured for the connected components when the system starts up.

With this concept, different gas sampling modules (for example ILCA and IRIA) can be configured for specific customer needs using standard components.

The MOPS PCB calculates values of the patient parameters and controls the sensor head signals.

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3.9 AMO FLOW ILCA PCB (flow controller)

Pump

LP AMO Flow ILCA

AMO FLOW ILCA PCB

C1: Damper

∆P sensor

∆P amplifier

Valv e c ontrol

calibration and pump voltage).

Pump current and voltage measurement

Switching regulator with digital potentiometer (pressure sensor

MOPS PCB connector

EEPROM

Sintered-

ILCA

cuvette

Offset calibration

Differential pressure

Absolute

pressure sensor

Val ve

Water trap bypass

WAL

Patient

digital and analog signals

Filter

Ambient air

Fig. 10: Connection diagram, AMO FLOW ILCA PCB

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The AMO FLOW ILCA PCB controls the pump and the valves of ILCA. The PCB is controlled and powered by the MOPS PCB. The actual regulation of the pump flow is handled by the software of the controller on the MOPS PCB.

The "AMO FLOW ILCA PCB" holds the following components:

− A DC/DC converter generates the pump voltage (2.5 - 7.5 V/DC). The output

voltage of the DC/DC converter is controlled through a serial digital potentiometer on the PCB and set by the controller of the MOPS PCB.

− Analog electronics for evaluation of the pump voltage, pump current, valve

current, and differential pressure.

− The power output elements of the valves.

− Service LEDs for the pump voltage, the valves, and the supply voltage.

− A temperature-compensated differential pressure sensor for flow metering. The

sensor offset is corrected with a serial digital potentiometer.

The flow is measured by way of the differential pressure of restrictor R1 plus the upstream sintered-metal filter. The measuring range is 0 to 350 mbar.

The AMO FLOW ILCA PCB is connected directly to a 60-pin connector on the MOPS PCB and is detected automatically by the MOPS PCB.

3.9.1 EEPROM of AMO FLOW ILCA PCB

The serial EEPROM contains the following information:

− Serial Number

− Hardware revision

− Software revision

− Product name (AMO FLOW ILCA PCB)

− Control parameters

− Position of the digital potentiometer at which the differential pressure output

DIFFDRUCK = 2.0 V

− The voltage setpoint value at which the flow is 150 mL/min

− OCCLUDED detection value

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3.9.2 Safety concept

The following voltages are routed via the AD converter of the MOPS PCB to the switch-mode regulator in order to monitor limits and regulate the flow:

− the differential pressure

− the pump voltage

− a voltage proportional to the pump current

− a voltage proportional to the total valve current

3.9.3 Valve

The valve at X4 switches between ambient air and patient air. An optional valve at X5 is possible (is not mounted in VAMOS).

The valve is non-polarized. There is no preferred position for the plug connector. A mechanical lock prevents the valves from detaching from the connector.

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6494.340 Vamos Version 3.0 Function Description

4 AMO O2 GRAF PCB

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+5V)

VAMOS PCB

communication

Asynchronous serial

+5V)

Shut-off

Interface to the

Driver

RS 232

Control:

LEDs

Keypad

Display unit

Control knob

Fan control

Debug interface

SpO2 module

Alarm/signal tones

Charging/battery control

(service BD32)

Interface to the

LP AMO O2-Graf Rev 02

VAMOS PCB

AMO O2 GRAF PCB Rev. 02

SRAM

EEPROM

Processor

Reset controller

FLASH EPROM

Oscillator 32 kHz

AMO O2 GRAF PCB

Reset of the

processor of the

AMO O2 GRAF PCB

MOPS PCB

Interface to the

(10...16.5 V)

Power supply

Voltage monitoring

+ 5 V power supply

Synchronous serial

communication with

the processor of the

AMO O2 GRAF PCB

Synchronous serial

communication with

the EEPROM on the

Fig. 11: Block diagram, AMO O2 GRAF PCB

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6494.340 Vamos Version 3.0 Function Description

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On the AMO O2 GRAF PCB the screen data are processed by a co-processor. The PCB controls and monitors the complete monitor function including the keypad, control knob, indicator lamps (LEDs), and SpO2 sensors.

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6494.340 Vamos Version 3.0 Function Description

+ 102 hidden pages

NORTH AMERICAN DRÄGER Vamos User manual

Specifications and Main Features

Frequently Asked Questions

User Manual