Caleo Technical Documentation Rev 5.1

Contents General 1

Symbols and Definitions

3

2

Notes

3

Function Description 1

Function Description 1.1

Canopy ... 8

1.2

Sensor unit ... 9

1.3

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1.4

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1.5

1.2.1

WT2 Sensor PCB ... 9

1.2.2

Integrated O2 Monitor PCB ... 14

1.2.3

Alarm PCB with alarm light ... 15

Display housing ... 16 1.3.1

Housing ... 16

1.3.2

Membrane keypad ... 17

1.3.3

EL display (electroluminescent display) ... 17

1.3.4

WT2 Controller PCB ... 18

1.3.5

Loudspeaker ... 21

1.3.6

Shaft encoder with control knob ... 21

1.3.7

WT2 Interface PCB (option) ... 21

Basic housing ... 21 1.4.1

Scale (option) ... 21

1.4.2

Mattress tray ... 22

1.4.3

Mattress tray with heating foil ... 22

Water container ... 22

I

Contents 1.6

1.7

Aggregate housing ... 22 1.6.1

Toroidal transformer ... 22

1.6.2

E-box ... 22

1.6.3

Water boiler with float and thermo switches (option) ... 34

1.6.4

Air heater with heating element and thermo switches ... 34

1.6.5

Air-temperature sensor ... 35

1.6.6

Hall sensor ... 35

1.6.7

Fan ... 35

1.6.8

Filter box ... 35

1.6.9

Water connection pipe (optional) ... 35

1.6.10

Pneumatics for O2 control (optional) ... 35

1.6.11

O2 adapter DISS/NIST ... 35

Trolley ... 35 1.7.1

Permanently set trolley ... 35

1.7.2

Electrically adjustable trolley (optional feature) ... 36

1.8

Secretion suction device ... 36

1.9

Oxygen cylinder holder ... 36

1.10 Monitor supporting plate ... 37 1.11 Interfaces ... 37

Maintenance Procedures 1

General notes

41

2

Tubing port/tubing grommet

43

General information about tubing port/tubing grommet ... 43 2.1.1

Water connecting pipe 3.1

II

45

Replacing the O-ring of the water connecting pipe ... 45

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Replacing tubing port/tubing grommet ... 43

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2.1

Contents 4

Fresh-air filter 4.1

47

Replacing the fresh-air filter ... 47

Schematics and Diagrams 1

Schematics and diagrams

51

Annex Parts catalog Test List

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Technical Information

III

Contents

K6150000IECIVZ.fm 24.10.07

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IV

General

1

Caleo 1

Symbols and Definitions

General

WARNING A WARNING statement provides important information about a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION A CAUTION statement provides important information about a potentially hazardous situation which, if not avoided, may result in minor or moderate injury to the user or patient or in damage to the equipment or other property.

NOTE A NOTE provides additional information intended to avoid inconvenience during operation.

Definitions according to German standard DIN 31051:

2

Notes

Inspection

= examination of actual condition

Maintenance

= measures to maintain specified condition

Repair

= measures to restore specified condition

Servicing

= inspection, maintenance, and repair

This Technical Documentation conforms to the IEC 60601-1 standard. Read each step in every procedure thoroughly before beginning any test. Always use the proper tools and specified test equipment. If you deviate from the instructions and/or recommendations in this Technical Documentation, the equipment may operate improperly or unsafely, or the equipment could be damaged.

The maintenance procedures described in this Technical Documentation may be performed by qualified service personnel only. These maintenance procedures do not replace inspections and servicing by the manufacturer. The information in this Technical Documentation is confidential and may not be disclosed to third parties without the prior written consent of the manufacturer. This Technical Documentation is for the purpose of information only. Product descriptions found in this Technical Documentation are in no way a substitute for reading and studying the Instructions for Use/Operating Manual enclosed with the product at the time of delivery.

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It is our recommendation to use only Dräger parts and supplies.

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General

Caleo Know-how contained in this Technical Documentation is subject to ongoing change through research and development and Dräger Medical reserves the right to make changes to this Technical Documentation without notice.

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NOTE Unless otherwise stated, reference is made to laws, regulations or standards (as amended) applicable in the Federal Republic of Germany for equipment used or serviced in Germany. Users or technicians in all other countries must verify compliance with local laws or applicable international standards.

Function Description

5

Caleo 1

Function Description

Function Description Caleo consists of a canopy, a display housing, a basic housing, an aggregate housing, and a trolley.

Figure 1

Front view of the Caleo

1

Canopy

2

Display housing

3

Basic housing

4

Aggregate housing

5

Drawer (option)

6

Trolley - non-adjustable trolley - electrically adjustable trolley (optional)

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Legend

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Function Description 1.1

Canopy

Caleo The canopy is a transparent acrylic cover. It is designed to sustain the set patient's environment. The canopy is mounted on column elements. When the front door or the hand ports are open, a warm air "curtain" ensures that the air temperature in the patient compartment does not decrease. The canopy comprises the canopy cover, a catch borehole, a double-wall (option) and holders.

Figure 2

Front view of the Caleo canopy

Catch borehole

2

Canopy cover

3

Double wall (optional)

4

Holders

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Legend

Caleo 1.2

Sensor unit

Function Description The sensor unit is mounted on two column elements. The sensor unit measures the environment inside the patient compartment. The sensor unit (Figure 3/1) contains the following subassemblies: –

Housing

–

WT2 Sensor PCB

–

Integrated O2 Monitor PCB

–

Alarm PCB with alarm light

Figure 3

Left view of the Caleo

The sensor unit contains the following sensors:

1.2.1

WT2 Sensor PCB

–

Air-temperature sensors

–

Oxygen sensor(s) (optional)

–

Second oxygen sensor for oxygen regulation (optional)

–

Humidity sensor (optional)

The WT2 Sensor PCB measures the air temperature, skin temperature, humidity, and oxygen. These values are transmitted to the microcontroller of the WT2 Actuator PCB.

–

Measurement of the patient's skin temperature

–

Measurement of the air temperature and independent excess temperature monitoring

–

Communication, A/D conversion, and electrical isolation

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The WT2 Sensor PCB has the following subassemblies:

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Function Description

Caleo Measurement of the skin temperature The control signals from the shift registers switch the individual skin-temperature measuring channels to the temperature hybrids. For the multiplexer to be able to test the skin-temperature measuring channels, it switches a parallel resistor to the respective skin-temperature measuring channel during operation.

10

Block diagram of the WT2 Sensor PCB, skin-temperature measurement

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Figure 4

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The microcontroller of the WT2 Sensor PCB tests the accuracy of the temperature hybrids during the 10-minute test. To do so, a control signal is transmitted to a FET. Thus, the 36 °C resistor is switched to the input of the temperature hybrids.

Caleo

Function Description Measurement of the air temperature and independent excess temperature monitoring The analog measured values of the air temperature reach temperature hybrid 1. The downstream excess-temperature comparator makes sure the air temperature in the patient compartment does not exceed 40.2 °C. If the air temperature is higher, a logic circuit on the WT2 Actuator PCB switches off the air heater.

Figure 5

Block diagram of the WT2 Sensor PCB, air-temperature measurement and independent excess-temperature monitoring

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During the 10-minute test, the excess-temperature test circuit simulates a temperature of 40.2 °C. During this period, the microcontroller monitors the function of the excess-temperature monitoring. An additional test circuit monitors also the air-temperature sensor 1.

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Function Description

Caleo Communication, A/D conversion, and electrical isolation The microcontroller controls and monitors the WT2 Sensor PCB functions. A quartz clocks the microcontroller (with integrated CAN/RS232 interface) with a frequency of 8 MHz. Shift registers use the SPI bus to control non-time-critical input and output connections. The microcontroller has serial connections, input/output connections, interruptible connections, and analog input connections for measurement. Optocouplers electrically isolate the input and output signals. The integrated RS232 interface of the microcontroller connects the WT2 Sensor PCB with the O2 Sensor PCB. The microcontroller can switch on/off the O2 Sensor PCB. The CAN bus driver connects the microcontroller with the WT2 Actuator PCB. The DC/DC converter generates the 5 VISO voltage from the 5V operating voltage. An EEPROM stores board-specific data. A/D converter and EEPROM are controlled with the SPI bus. The A/D converter integrated in the microcontroller receives the signal from the independent excess-temperature monitoring.

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The A/D converter measures the analog measuring signals (humidity (optional feature), air temperature, skin temperature, and 5 VISO voltage).

Caleo

Function Description

Block diagram of the WT2 Sensor PCB (communication, A/D conversion, and electrical isolation)

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Figure 6

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Function Description 1.2.2

Integrated O2 Monitor PCB

Caleo The Integrated O2 Monitor PCB receives the converted voltage from the oxygen sensor.

Figure 7

Block diagram of the Integrated O2 Monitor PCB

Skin-temperature sensor socket

Skin-temperature sensors Disposable skin-temperature sensors measure the patient's skin temperature.

Caleo is provided with an oxygen sensor for measurement of the oxygen content. The oxygen measurement range is 19 vol.% O2 to 99 vol.% O2. The microcontroller does not regulate the set oxygen value. Alarm limits can be adjusted or disabled completely. Oxygen Regulation (optional) The microcontroller compares the set oxygen value with the actual oxygen value. The microcontroller automatically adapts the actual oxygen value to the set oxygen value.

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Oxygen Measurement (optional)

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The skin-temperature sensor connectors are connected to the skin-temperature sensor sockets.

Caleo

Function Description Humidity sensor (optional) The humidity sensor is mounted on the sensor unit. The humidity sensor measure the air humidity in the patient compartment. Humidity Control (optional) The performance value of the water boiler can be adjusted. However, the microcontroller does not readjust these performance values. Humidity Regulation (optional) The microcontroller compares the set performance values with the actual performance values of the water boiler. The microcontroller automatically adapts the actual performance values of the water boiler to the set performance values.

1.2.3

Alarm PCB with alarm light

The alarm light is mounted on the sensor unit. If an alarm occurs, the microcontroller on the WT2 Controller PCB triggers the alarm light.

Block diagram of Alarm PCB with alarm light

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Figure 8

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Function Description 1.3

Display housing

Caleo The display housing (Figure 9/1) is Caleo's display and control unit.

Figure 9

Front view of the display housing

The display housing contains the following subassemblies: –

Membrane keypad

–

EL display (electroluminescent display)

–

WT2 Controller PCB

–

Lithium battery

–

Shaft encoder with control knob

–

Loudspeaker

–

WT Interface PCB (optional)

The housing contains the membrane keypad, the EL display, the WT2 Controller PCB, the lithium battery, the shaft encoder with control knob, the loudspeaker, and the WT2 Interface PCB (optional).

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Housing

Housing

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1.3.1

–

Caleo 1.3.2

Membrane keypad

Function Description The membrane keypad has 12 keys and 7 LEDs. The membrane keypad is used to enter patient parameters. The LEDs on the keys indicate which function is currently selected.

Figure 10 Membrane keypad 1.3.3

EL display (electroluminescent display)

The EL display shows plain text messages. The EL display has a resolution of 320 x 240 pixels and adapts automatically to lighting conditions (brightness and contrast).

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The EL display consists of an electroluminescent glass plate and the control electronics. An integrated DC/DC converter generates the operating voltages 5 VDC and 12 VDC.

Figure 11

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EL display

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