Drager 8000 IC, 8000 SC, 8000 NC User manual

Function Description Incubator 8000 IC / SC / NC

Table of contents:

1 General .............................................................................................................................			3
1.1	Description of the Incubator 8000 IC / SC / NC ............................................................		3
1.2	Safety Features.............................................................................................................		5
1.3	Alarms ...........................................................................................................................		5
1.3.1 Alarm for set value deviations and water shortage			5
1.3.2 Sensor alarms and fan failure alarm			6
1.3.3		Module faults	6
1.3.4		Total shutdown	7
2 Functional description of Incubator 8000 IC / SC / NC .....................................................			7
2.1	Description of component block diagram ......................................................................		7
2.1.1 Component block diagram 8000 IC			7
2.1.2 Component block diagram 8000 SC / NC			10
2.1.3 Fresh air intake and O2 supply			13
2.1.4		Heating unit	13
2.1.5		Electronics module	14
2.1.6 Climate sensor housing (Inc. 8000 IC)			15
2.1.7 Air temperature sensor (Inc. 8000 SC / NC)			15
2.1.8		Height adjustment	15
2.2. Description of block diagram of electronic functioning................................................			15
2.2.1 Incubator 8000 IC / SC / NC block diagrams			15
2.2.2		Detailed description of block diagram	20
2.3	Description of safety facilities......................................................................................		26
2.3.1		Alarm display	26
2.3.2		Software	28
3 Detailed description of Incubator 8000 IC / SC / NC sub-assemblies ............................			30
3.1	Heating unit.................................................................................................................		30
3.1.1 Detailed description of function blocks of Unit PCB			31
3.2	Electronics Module......................................................................................................		32
3.2.1		Keyboard	32
3.2.2		Display Air PCB	32
3.2.3		Display PCB	33

6141.22X Incubator 8000 IC/SC/NC

Function Description

09.99

Page 1 of 49

3.2.4		Display Humidity PCB (Inc. 8000 SC / NC only)										34
3.2.5		CPU PCB										34
3.2.6		Analog PCB										35
3.2.7		Power Pack PCB										40
3.2.8		Motherboard PCB										42
3.2.9		Switch PCB										45
3.2.10		+5 V voltage regulator										45
3.3	Air temperature sensor Inc. 8000 SC / IC ...................................................................											46
3.4	Climate sensor housing Inc. 8000 IC ..........................................................................											47
3.4.1		Intended use										47
3.4.2		Arrangement										47
3.4.3		Detailed description										47
3.5	Skin temperature sensor .............................................................................................											49

6141.22X Incubator 8000 IC/SC/NC

Function Description

09.99

Page 2 of 49

1 General

1.1 Description of the Incubator 8000 IC / SC / NC

A special airflow system has been developed for the Incubator 8000 series. This system routes heated air between the double walls on the entire front (hinged front door), over the roof of the canopy and then draws it down again between the double walls at the rear by means of an extraction system. Thus the baby lies in an area with very low airflow so that heat loss by convection is reduced. For the Incubator 8000 SC / NC the double walls at the sides and at the rear are an option.

The all-round double wall design of the Incubator 8000 series canopy also reduces the loss of body heat by radiation. When the hinged front door and the hand port doors are open, there is still an effective hot air curtain which prevents appreciable cooling inside the canopy.

A new type of mattress gives very low heat loss by conduction through the bed, resulting in a high level of comfort for the baby. It is made of a particularly soft foam plastic, smoothly encased in film to provide an absolutely hygienic seal.

The incubator is equipped with easy-moving, swivelling castors which permit easy movement around the hospital. Two of the castors can be locked. There are rails, which can also be used as handles, on the sides for holding ancillary equipment.

The sensor housing which is located near the baby's head responds very rapidly to changes in the environment inside the incubator and contributes to a very sensitive control system. The housing contains the air temperature sensor, the optional oxygen sensor and the optional relative humidity sensor. It also contains the connection point for the skin temperature sensor on Incubator 8000 IC units without ThermoMonitoring.

6141.22X Incubator 8000 IC/SC/NC

Function Description

09.99

Page 3 of 49

At the Incubator 8000 SC / NC an air temperature sensor located near the baby's head is attached at the rear of the canopy, the connection point for the skin temperature sensor is located at the back of the Incubator next to the mains input on units without Thermomonitoring.

The optional oxygen control module on Incubator 8000 IC units permits the required oxygen concentration within the canopy to be pre-selected and controlled automatically. If the actual value deviates from the set value, warning signals are given. The control system permits a set oxygen concentration to be achieved within a very short time (40 % in 1.5 minutes and 60 % in

< 7 minutes). This permits rapid action in emergencies and rapid return to a selected oxygen concentration after opening the hinged front door or the hand ports.

The humidity control of the Incubator 8000 IC permits a required humidity value to be preselected and maintained. The water required for this is supplied from sterile water bottles.

The humidity supply of the Incubator 8000 SC / NC humidity control can be adjusted in 10 steps.

Evaporation of the water guarantees completely hygienic air humidification.

In accordance with hygienic requirements, all parts of the Incubator which come into contact with the gas breathed by the baby can be removed from the basic unit.

The electrically-operated height adjustment mechanism permits an optimum working height to be set for both tall and small nurses. In addition, the Incubator can be lowered so that the nurse can carry out lengthy procedures whilst sitting down, and there is also adequate legroom beneath it.

The hand port openings have been designed to provide better access for the arms of the nursing staff than round openings do, yet have a smaller opening cross-section, thus reducing heat loss.

The incubator is controlled by a microprocessor. The Incubator carries out a general self-test when it is switched on and automatically every 10 minutes thereafter. This test checks the various assemblies in the incubator which are crucial to safety by operating them briefly. The operator is automatically requested to recalibrate the oxygen sensors after switching on the 02 control system and, thereafter, after every 24 hours of operation. Measured value deviations or system failures are indicated visually and audibly. The heating system and valve are automatically switched off if operating conditions are outside permitted limits.

The control systems for air temperature, skin temperature and humidity are PIor PID-controls and give optimum control.

An additional built-in air-cooler produces rapid cooling as soon as the actual value of the air temperature is a few tenths of a degree above the set value.

6141.22X Incubator 8000 IC/SC/NC

Function Description

09.99

Page 4 of 49

1.2Safety Features

A self-test is conducted when the incubator is switched on. This involves a test of all memories in the microprocessor control system and a check to establish whether the various program segments are running correctly.

The function of actuators, acknowledgement signals, displays and indications is checked by switching them on and off. For example, the functioning of the fan is checked not by establishing whether power is reaching the electric motor, but rather by measuring the speed of rotation directly on the fan. The wiring to peripheral devices is provided in duplicate.

This complete test is also repeated every 10 minutes during operation.

All options, whether they are activated or not, are tested. An error message is thus indicated for a faulty module even if it is switched off. This ensures that the operator is always fully aware of the actual condition of the incubator.

When the incubator is switched on again, or when a module is switched on, the relevant required value is set to "starting value". The set value display then flashes requesting confirmation or modification of this value. The actual value indication is displayed alternately with the prompt "SET" (not humidity Inc. 8000 SC / NC).

1.3Alarms

The incubator has a graduated system of alarm signals. Faults which occur are signalled in order of importance. If a non-essential option fails, it does not mean that the incubator has to discontinue any functions which are of vital importance. The set value deviation and water shortage alarms are signalled by an intermittent warning tone which can be suppressed for 10 minutes. Faults which entail greater potential danger are signalled by a continuous tone which cannot be silenced. In addition, the relevant warning LEDs flash to enable the operator to locate the fault rapidly. The alarm signals are described in detail below.

1.3.1Alarm for set value deviations and water shortage

Deviations outside the set limits for oxygen concentration (> 5 % by Vol. 02), skin temperature (> 0.5 °C with software version 10.n or 20.n and > 1.0 °C with software version 11.n and 21.n on us units only) and air temperature (> 1.5 °C), in addition to over-temperature (> 38 °c or >

39.9 °C) and water shortage result in the following alarm signals:

-The actual value display of the relevant control module flashes.

-The specific alarm LED flashes.

-Intermittent alarm tone sounds (can be suppressed for 10 min.).

-The central alarm LED flashes (if available).

6141.22X Incubator 8000 IC/SC/NC

Function Description

09.99

Page 5 of 49

The alarm tone for set value difference - 1.5 °C air temperature - is suppressed automatically for 30 minutes when the incubator is switched on to avoid a continuous alarm signal sounding during the warming-up phase.

The "Reset" warning button for over-temperature has to be reset by the operator to ensure full awareness of the error. All other alarms are reset automatically when the relevant conditions have returned to normal.

If an alarm has been suppressed, the red alarm LED, which had previously flashed, stays alight but is constant, and a yellow LED indicator above the switch-off button indicates the switched-off mode. If another alarm occurs when alarms are suppressed, the audible alarm is re-activated immediately. Depending on the type of fault, this later alarm can be suppressed again. The period for automatic reactivation of the first alarm tone is then prolonged by the time interval between the two alarms.

1.3.2Sensor alarms and fan failure alarm

Faults in the sensors for oxygen, skin temperature, humidity, air temperature and failure of the fan produce the following alarm signals:

-Three dashes ("---") flash on the relevant actual value display.

-The actual air temperature value flashes in the event of fan failure.

-The specific alarm LED flashes. 0 Continuous alarm tone (non-suppressible)

-The central alarm LED flashes (if available).

Where there have been sensor warnings for oxygen concentration or relative humidity and the relevant module has been switched off, the incubator can continue to operate with the other functions. The same applies when there is a skin temperature control alarm, though, in this case, the faulty sensor must be removed.

1.3.3Module faults

Alarms for faults in the control modules for oxygen concentration, skin temperature and relative humidity produce the following alarm signals:

-The letters "Err" (= Error) appear on the relevant actual value display, flashing if the module is switched on and not flashing if the module is switched off.

-The red "Inop" LED is lit when the module is switched on.

-Continuous alarm tone (non-suppressible) if the module is switched on.

The functions of the other modules which are operating correctly are retained. The operator can carry on using the incubator after the faulty module has been switched off.

6141.22X Incubator 8000 IC/SC/NC

Function Description

09.99

Page 6 of 49

1.3.4Total shutdown

Faults in the central microprocessor control system and in the air temperature control module result in complete shutdown of the incubator. The following alarm signals are then given:

-Red "inop" LED is lit.

-Continuous alarm tone (non-suppressible).

Individual checks should be carried out to determine whether the fault appeared only temporarily. If the incubator shows the "Inop" signal after it is switched on again, it is inoperative. It must not be used and must be clearly marked faulty.

2 Functional description of Incubator 8000 IC / SC / NC

2.1Description of component block diagram

-Component block diagram 8000 IC

-Component block diagram 8000 SC / NC

-Fresh air intake and 02-supply

-Unit with air heating, fan and humidifier

-Electronics module

-Climate sensor (Inc. 8000 IC only)

-Air temperature sensor (Inc. 8000 SC / NC)

-Height adjustment

2.1.1Component block diagram 8000 IC

6141.22X Incubator 8000 IC/SC/NC

Function Description

09.99

Page 7 of 49

2.1.2Component block diagram 8000 SC / NC

6141.22X Incubator 8000 IC/SC/NC

Function Description

09.99

Page 10 of 49

2.1.3Fresh air intake and O2 supply

2.1.3.1Fresh air intake

Through a fresh air filter 84 02 926 at the back of the Incubator 30 L/min fresh air are taken in by dosing via the running impeller.

2.1.3.2 O2 supply

Incubator 8000 IC:

There are two possibilities for 02 supply in Incubator 8000 IC:

a.External 02-supply

b.Oxygen control

Incubator 8000 SC / NC:

With Incubator 8000 SC / NC only external 02-supply (a.) is possible.

a. external O2 supply

Via a socket oxygen can be supplied to the Incubator through a flowmeter. According to specification the oxygen concentration has to be monitored with an additional oxygen measuring instrument with upper and lower alarm limit.

b. oxygen control

An automatic control can be carried out with the integrated 02 concentration control. According to set value deviation one valve with 29 L/min is opened by the electronic control. According to specification the oxygen is supplied via the fresh air filter to the patient room.

2.1.4Heating unit

The following function blocks are on the unit:

-fan motor

-air heating with over-temperature fusing

-humidifier with over-temperature fusing

-mains transformer

-auxiliary mains transformer for mains connection

-semiconductor relay for air heating and humidifier

-safety relay for heatings and 02 valves

-Sensor for monitoring of:

the air heating (I/U converter)

the vaporizer (temperature for water shortage alarm) the impeller (fan)

-fuses for the mains input and the internal supply voltages

6141.22X Incubator 8000 IC/SC/NC

Function Description

09.99

Page 13 of 49

2.1.5Electronics module

The electronics module comprises the following function blocks:

-keyboard

-PCB Display Air Temperature:

a.triggering of display elements for air temperature control

b.read-out of keyboard

-PCB Display Options and PCB Display Humidity/Skin Temperature: triggering of the individual display elements of the options

-PCB CPU:

a.processor 6802

b.EPROM

c.RAM with internal battery for data backup

d.timer

e.watchdog

-PCB Analog

a.reading in of measured values of climate sensor housing (Inc. 8000 IC) or of air temperature sensor (Inc. 8000 SC / NC)

b.reading in of climate sensor housing position (Inc. 8000 IC)

c.processor-dependent monitoring circuit for over-temperature and existence of oxygen sensors

d.processor-dependent monitoring circuit forpresence of oxygen sensors (Inc. 8000 IC)

-PCB Power Pack

a.Rectification of supply voltage +15 V and -15 V

b.Rectification and control of supply voltage +5 V. The voltage regulator is positioned on the right hand side panel of the electronics module.

c.Charaino circuit for battery of the mains failure-alarm.

d.Trigger circuit for horn and mains failure LED

e.Horn

-Motherboard

a.Address decoder for peripherals

b.PIAs for triggering of peripherals

c.Evaluation of over-temperature alarm

d.Fan failure monitoring

e.Watchdogs

f.Voltage monitoring

g.Evaluation of air heating monitoring

h.Evaluation of impeller monitoring

6141.22X Incubator 8000 IC/SC/NC

Function Description

09.99

Page 14 of 49

i.Evaluation of valve monitoring

j.Triggering of INOP-LED

k.Triggering of additional fan

2.1.6Climate sensor housing (Inc. 8000 IC)

This sensor detects the climatic conditions inside the incubator. For calibration of the 02 measurement function the sensor can be swung out of the incubator interior.

Function blocks:

-2 air temperature sensors

-2 02 sensors

-Terminal for skin temperature sensor (units with software version 20.n only)

-Humidity sensor with evaluation electronics

-2 micro switches to determine sensor position

2.1.7Air temperature sensor (Inc. 8000 SC / NC)

For measurement of the air temperature two identical sensors are enclosed in one housing.

2.1.8Height adjustment

The height is adjusted via an Electro-motor with spindle. The pedestal is triggered via a footoperated switch. The Electro-motor is equipped with an automatically resettable overtemperature switch.

2.2.Description of block diagram of electronic functioning

2.2.1Incubator 8000 IC / SC / NC block diagrams

6141.22X Incubator 8000 IC/SC/NC

Function Description

09.99

Page 15 of 49