ASTOTHERM plus Models AP220 - AP220S and AP260 - AP260S Repair Instructions Rev 5.Feb 2005

ASTOTHERM PLUS Repair Instructions

Table of Contents 1 TECHNICAL DESCRIPTION...5 1.1 General...5 1.1.1 Structure ...6 1.1.2 Description of the electronics ...7 1.2 Technical Data...10 1.2.1 ASTOTHERM PLUS 200 and 200S ...10 1.2.2 ASTOTHERM PLUS 220, 220S and 260, 260S...11 1.3 Terminal connecting plan ...12 1.4 ASTOTHERM PLUS spare parts ...13 2 2.1 2.2

GENERAL GUIDELINES AND PRINCIPLES FOR THE REPAIR OF ASTOTHERM PLUS BLOOD AND INFUSION WARMERS ...20 Responsibility of the manufacturer...21 Procedure for ASTOTHERM PLUS repairs...22

3

CLEANING AND DISINFECTING ...23

4

FUNCTIONAL CHECK ...24

5

TROUBLESHOOTING...31

6 6.1 6.2 6.3 6.4 6.5 6.6

DISMANTLING ...34 Dismantling for troubleshooting in assemblies...34 Dismantling bottom part assembly ...36 Dismantling the top part assembly ...37 Dismantling the heat exchanger cylinder assembly ...38 Dismantling the device fixing assembly...39 Dismantling the heat protection sleeve ...39

7 7.1 7.2 7.3 7.4 7.5 7.6

ASSEMBLING THE DEVICE...40 Assembling the device fixing assembly ...40 Assembling the heat exchanger assembly ...40 Assembly of the top part assembly ...42 Assembling the bottom part assembly...44 Fitting the heat protection sleeve...46 Final assembly of assemblies ...46

8

ELECTRICAL SAFETY TEST ...49

9

CONTINOUS DUTY TEST...50

10

RETURN AND/OR DISPOSAL OF DEVICES OR ASSEMBLIES...51

11

APPENDIX...51

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ASTOTHERM PLUS Repair Instructions

Index of Figures Fig. 1 Electronics block diagram... 9 Fig. 2 Connections between electronic components ... 12 Fig. 3 Cross-section of the ASTOTHERM PLUS ... 13 Fig. 4 Cross-section of bottom part assembly with optional components ... 14 Fig. 5 Cross-section of top part assembly ... 15 Fig. 6 Flow chart for repairs ... 22 Fig. 7 Display elements of Model 200(S) ... 24 Fig. 8 Display elements of models 220(S) und 260(S) ... 24 Fig. 9 Measuring control temperature and temperature overshoot ... 26 Fig. 10 Testing safety cut-off at warmer inlet ... 28 Fig. 11 Testing safety cut-off at warmer outlet... 28 Fig. 12 Pin assignment on the ASTOLINE plug... 29 Fig. 13 Test citrcuit for devices with an ASTOLINE ... 30 Fig. 14 Lifting off bottom part of housing ... 35 Fig. 15 Lifting off heat exchanger ... 35 Fig. 16 ASTOTHERM PLUS and ASTOLINE dismantled into assemblies ... 36 Fig. 17 Device fixing assembly ... 39 Fig. 18 Inserting fixing strip... 41 Fig. 19 Routing NTC1 connecting wires ... 41 Fig. 20 NTC2 and NTC3 connecting wires ... 42 Fig. 21 Aligning the bottom part on the device fixing ... 44 Fig. 22 Fitting the ASTOLINE board ... 45 Fig. 23 Equipotential bonding plug ... 45 Fig. 24 Aligning equipotential bonding plug ... 45 Fig. 25 Cable routing in heat exchanger - Plug in heating cables to suit mains voltage. ... 47 Fig. 26 Attach mains cable and cable tie ... 47 Fig. 27 ASTOLINE models: insert insulating plate... 47 Fig. 28 Contact point for grounding impedance test ...49 User information: Test results which must be achieved to ensure safe operation are outlined by a frame.

The description for dismantling covers every possible assembly and step. If a defective component or an assembly are to be replaced, only the steps necessary for this should be performed.

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ASTOTHERM PLUS Repair Instructions

1

Technical description

1.1

General

Applications The ASTOTHERM PLUS allows fluids supplied to patients to be heated, either to avoid or reduce hypothermia or to increase well-being. Applications include transfusions, infusions, dialysis, haemofiltration and apheresis.

The warmer works in accordance with the principle of flow heating, i.e. the heat is transmitted by the heat exchanger via the sterile infusion extension to the fluid flowing within it.

If the full heating capacity is not required, two infusion extensions can also be inserted into the first and second halves of the heat exchanger. A check on heat exchanger temperature at the inlet and outlet avoids fluids being overheated, even if they have different inlet temperatures.

The patented heat protection sleeve insulates the heat exchanger cylinder and the infusion extension against the effects of ambient cold (e.g. air-conditioning systems) and thus increases the degree of efficiency. There is an opening in the centre of the heat protection sleeve for use of a second infusion extension. This is where extensions can be routed in and out and secured with the hand grips.

Overheating is reliably prevented by the following measures: C 2 separate temperature sensors for temperature control, temperature display and excessive temperature cut-off, C an additional independent temperature sensor for excessive temperature cut-off, C optical and acoustic alarms.

On models 220(S) and 260(S), the temperature of the ASTOTHERM PLUS can be set alternatively at three fixed temperature steps up to 43 °C. On the model 200(S), the temperature is fixed at 40 °C. The temperature display always shows the current mean temperature of the heat exchanger.

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ASTOTHERM PLUS Repair Instructions

Heating of the medium is based on flow speed and inlet temperature. For an optimum heat transfer we recommend the original infusion extension ASTOTUBE. (see outlet temperature diagrams in the operating instructions). If on the models 220(S) and 260(S) the displayed temperature of the heat exchanger drops by more than 4 °C below the selected set temperature, the inadequate temperature alarm is activated. On the model 200(S), the inadequate temperature alarm is fixed at 32 °C. There are the following versions of the ASTOTHERM PLUS which can be delivered: Order no

Heat exchanger groove

AP 200* AP 200 S*

4 mm 4 mm

AP 220

4 mm

AP 220 S

4 mm

AP 260

6,8 mm

AP 260 S

6,8 mm

Temperature

40°C (fixed) 40°C (fixed) 37°C, 39°C, 41°C (selectable) or 39°C, 41°C, 43°C (selectable) 37°C, 39°C, 41°C (selectable) or 39°C, 41°C, 43°C (selectable) 37°C, 39°C, 41°C (selectable) oder 39°C, 41°C, 43°C (selectable) 37°C, 39°C, 41°C (selectable) oder 39°C, 41°C, 43°C (selectable)

Power consumption

250 W 250 W

ASTOLINE actively-heated profile up to the patient U

450 W

-

450 W

U

450 W

-

450 W

U

*no more in the actual sales program

Description of ASTOLINE (optional accessory) Using the active ASTOLINE insulation, it is possible to limit cooling of the fluid en route from the warmer to the patient. The heated flexible silicone body surrounds the infusion extension over a distance of up to 130 cm, ensuring that the part of the infusion line which would otherwise be exposed to the cool ambient air is both insulated and heated. Its special shape also enables infusions and transfusions to be observed all the way to the patient. 1.1.1 Structure In the top part of the housing underneath the front panel is the board with the components for electronic control, the keys for operation and the associated LEDs and LCD for actual and selected temperature displays. The board is operated exclusively with low-voltage power. Depending on model type, the heat exchanger cylinder has either 11 (models 200(S) and 220(S)) or 9 windings (model 260(S)). Approximately 40 cm of infusion extension are required for one winding. The heating system is attached to the inner surface of the aluminium heat exchanger cylinder. The three temperature sensors for temperature control, display and safety cut-offs are located in the end faces of the cylinder. Page 6

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ASTOTHERM PLUS Repair Instructions

The transformer board is inserted in the heat exchanger cylinder. On this board are the fuses, the connections for the mains cable and the heating and the heating control LED. WARNING! This board is live (100 V AC to 240 V AC)! The transformer board is secured in the heat exchanger cylinder by the intermediate ring and the fixing strip.

A universal mounting is fitted to the bottom part of the housing, allowing the device to be attached to an infusion stand (dia. 12 mm to dia. 35 mm) or to a standard medical rail. Warmers with ASTOLINE active insulation (models 200S, 220S and 260S) have the board and the device socket for the ASTOLINE fitted in the bottom part. 1.1.2 Description of the electronics C Temperature control: The temperature at the heat exchanger cylinder is controlled by a control unit consisting of a microprocessor, an A/D converter and a triac unit. The actual temperature is determined by two NTC sensors at the inlet (NTC1) and outlet (NTC2) (cf. Fig. 1, Block Diagram). C Temperature display: The actual temperature is displayed in the LCD as a mean value. At a temperature below 15 °C, only three bars at the bottom are shown and above 50 °C, only three bars at the top. The three small displays on the 220(S) and 260(S) models show the user-selectable temperatures. The frame outlines the current selection according to which the temperature of the heat exchanger is being controlled. On the model 200(S), the temperature of the heat exchanger is fixed.

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ASTOTHERM PLUS Repair Instructions

C Safety cut-off at warmer inlet (Heat exchanger rear side): The safety cut-off at the warmer inlet is a device independent of the microcontroller. It checks whether NTC1 is hotter than the alarm limit (temperature value of second excessive temperature cut-off, see Section 1.2) In the event of an alarm, the safety cut-off switches off relay K1. This interrupts the heating current and the power supply for K1 and K2. Drop-out of the relay is indicated by the flashing alarm LED and the alarm tone. If the heat exchanger cylinder cools to below the alarm limit, the device can be re-started manually. NTC1 cannot be affected by any conceivable defect of the safety cut-off at the warmer outlet or of NTC3. C Safety cut-off at warmer outlet (heat exchanger front side): The safety cut-off at the warmer outlet works according to the same principle as the safety cut-off at the inlet, though it checks NTC3 (temperature value of the first excessive temperature cut-off, see Section 1.2) located at the outlet and controls relay K2. NTC3 cannot be affected by any conceivable defect of the control system, the safety cut-off at the warmer inlet, NTC1 or NTC2. The drop-out of the relay is indicated by the flashing alarm LED and the alarm tone. If the heat exchanger cylinder cools to below the alarm limit, the device can be restarted manually. C Test devices: Pressing the Start key checks whether relays K1 and K2 reliably cut power if so required. A fault signal is sent to the safety cut-off at the warmer inlet followed by the safety cut-off at the warmer outlet. The safety cut-offs react with an audible click. Following a successful test, the device switches on the heating. With alarm tests 1 and 2, the safety cut-offs at the warmer inlet and outlet can be tested individually (cf. operating instructions, Section “PERIODICALLY RECURRING TEST MEASURES”). C EEPROM memory: An EEPROM is provided to store constants and operating states. Calibration data are also stored here.

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ASTOTHERM PLUS Repair Instructions

C Watchdog device: The microprocessor is continuously monitored by a so-called watchdog circuit. If the microprocessor becomes defective due to a malfunction, the watchdog circuit emits a signal and the device goes to stand-by mode. C Mains power failure bridging: This is used to restart the device automatically in the previously selected state in the event of a brief power failure. Automatic start is effected in the event of a power failure lasting up to 5 seconds, 30 seconds at most. C ASTOLINE active insulation: ASTOLINE is an auxiliary heating system controlled by current and voltage. If voltage or current are above or below the permissible limit values, an alarm is activated. The board is operated with low-voltage power.

Fig. 1 Electronics block diagram

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ASTOTHERM PLUS Repair Instructions

1.2 Technical Data 1.2.1 ASTOTHERM PLUS 200 and 200S ASTOTHERM PLUS 200(S)

AP200(S) EU AP200(S) UK AP200(S) CH AP200(S) DK

AP200(S) NA

230-240 VAC "10% 47-63 Hz

100-115 VAC "10% 47-63 Hz

Line voltage Power supply cord

SCHUKO plug H 05 VVF 3x0,75

BS - plug 13A Fuse H 05 VVF 3x1

Schweiz plug H 05 VVF 3x0,75

DK - plug DK2-Ia, DK25a H 05 VVF 3x0,75

Hospital Grade Plug NEMA 5-15P SJO, SJT 18/3

Impedance of protective earth

#0,2 Ohm

#0,2 Ohm

Insulation resistance

>2 MOhm

>2 MOhm

AC leakage current

#0,2 mA

Primary Fuses

2x4A

Secondary Fuses Power input

2 x 0,63 A 250 W

Selfstart after mains power failure

5 to 30 sec.

Protection class Protection level (IEC 601-1) Humidity protection Classification as per appendix IX UMDNS Code Dimensions height width depth Weight

I defibrillation-proof applied part of type B IPX4 IIb (Rule 9) 10-447 145 mm 135 mm 295 mm 2,9 kg

Warm- up time

approx. 1 min (20 °C to 35 °C)

Operating mode

continous operation

Permissible ambient temperature for operation for storage

+16 °C to +30 °C -40 °C to +70 °C

Ambient operating humidity

10 % to 90 %

Operation temperature

40 °C (" 0,5 °C)

1. safety cut-off

42,5 °C (" 0,5 °C)

2. safety cut-off

43,5 °C (" 0,5 °C)

heater bimetal cut-off

65 °C (" 5 °C)

inadequate temperature alarm

below 32 °C

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ASTOTHERM PLUS Repair Instructions

1.2.2 ASTOTHERM PLUS 220, 220S and 260, 260S ASTOTHERM PLUS 220(S) ASTOTHERM PLUS 260(S)

AP220(S) EU AP260(S) EU

AP220(S) CH AP260(S) CH

AP220(S) DK AP260(S) DK

230-240 VAC "10% 47-63 Hz

Line voltage Power supply cord

AP220(S) UK AP260(S) UK

SCHUKOplug H 05 VVF 3x0,75

BS - plug 13A Fuse H 05 VVF 3x1

AP220(S) NA AP260(S) NA 100-115 VAC "10% 47-63 Hz

Swiss plug H 05 VVF 3x0,75

DK-plug DK2-Ia, DK2-5a H 05 VVF 3x0,75

Hospital Grade Plug NEMA 5-15P SJO, SJT 18/3

Impedance of protective earth

#0,2 Ohm

#0,2 Ohm

Insulation resistance

>2 MOhm

>2 MOhm

AC leakage current

#0,2 mA

Primary Fuses

2x4A

Secondary Fuses

2 x 0,63 A

Power input Selfstart after mains power failure Protection class Protection level (IEC 601-1) Humidity protection Classification as per appendix IX UMDNS Code Dimensions height width depth Weight

450 W 5 to 30 sec. I defibrillation-proof applied part of type B IPX4 IIb (Rule 9) 10-447 145 mm 135 mm 295 mm 2,9 kg

Warm- up time

approx. 1 min (20 °C to 35 °C)

Operating mode

continous operation

Permissible ambient temperature for operation for storage

+16 °C to +30 °C -40 °C to +60 °C

Ambient operating humidity Operation temperature

1. safety cut-off

2. safety cut-off heater bimetal cut-off inadequate temperature alarm

Revision: 5 – 02/2005

10 % to 90 % 37 °C (" 0,5°C) / 39 °C (" 0,5 °C) / 41 °C (" 0,5 °C) or 39 °C (" 0,5°C) / 41 °C (" 0,5 °C) / 43 °C (" 0,5 °C) 41°C-devices: 42,5 °C (" 0,5 °C) 43°C-devices: 45,5 °C (" 1°C) 41°C-devices: 43,5 °C (" 0,5 °C) 43°C-devices: 46,0 °C (" 1 °C) 65 °C (" 5 °C) 4 °C (" 0,5 °C) below operation temperature

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ASTOTHERM PLUS Repair Instructions

1.3

Terminal connecting plan

Fig. 2 Connections between electronic components

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ASTOTHERM PLUS Repair Instructions

ASTOTHERM PLUS spare parts

34

12

10

31

18

14

19

23

21

7

33

22

9

8

1

20

1.4

Fig. 3 Cross section of the ASTOTHERM PLUS

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Page 13

27

16

26

25

15

17

24

35

11

29

13a 28

32

13

(27)

30

ASTOTHERM PLUS Repair Instructions

Fig. 4 Cross-section of bottom part assembly with optional compoents

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Revision: 5 – 02/2005

5

6

(2)

1

2

3

4

ASTOTHERM PLUS Repair Instructions

Fig. 5 Cross-section of top part assembly with optional compoents

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ASTOTHERM PLUS Repair Instructions

ASTOTHERM PLUS spare parts When ordering please indicate always model number and serial number! No.

Order number

Name consist of

1

9751.4205.00

TOP PART OF HOUSING AP 200 complete with handle, bolts and front panel

9750.4205.00

TOP PART OF HOUSING AP 220/260 complete with handle, bolts and front panel

9751.4202.00

TOP PART OF HOUSING AP 200S complete with handle, bolts and front panel

9750.4202.00

TOP PART OF HOUSING AP 220S complete with handle, bolts and front panel

9770.4202.00

TOP PART OF HOUSING AP 260S complete with handle, bolts and front panel

n.g. n.g.

9750.8240.00 9750.8241.00

with fastening material

only from SN: SN: BSEU1017, BSUK1021, BSCH1012, BSNA1001, DSEU1323, DSUK1043, DSCH1012, DSNA1054

AL-Holder 6,8 mm

only from SN: HSEU1015, HSUK1018, HSCH1001, HSNA1015

AL-Holder 4 mm with fastening material

2

9750.4202.14

HANDLE with fastening material

3

9750.4200.13

DISPLAY COVER

4

9751.4200.05

FRONT PANEL AP 200

9751.4200.02

FRONT PANEL AP 200S

9750.4200.05

FRONT PANEL AP 220/260

9750.4200.02

FRONT PANEL AP 220S/260S

9750.2201.01-M841

*OPERATING BOARD for M841 NTCs

9750.2201.01-Glas

*OPERATING BOARD for glass NTCs

5

(red or black NTC wire insulation) tested and adjusted for Type

(white NTC wire insulation) tested and adjusted for Type

6

9750.2200.14

KEY EXTENSION (1 Piece)

7

9750.2101.01-M841

*TRANSFORMER BOARD for M841 NTCs

9750.2101.01-Glas

*TRANSFORMER BOARD for glass NTCs

(red or black NTC wire insulation) tested

(white NTC wire insulation) tested

0450.2101.43

* TRANSFORMER BOARD for glass NTCs (43°C) (white NTC wire insulation) tested

8

9750.8100.02

AXLE HEAT PROTECTION SLEEVE

9

9750.8100.03

HEAT PROTECTION SLEEVE AP HALF PART 1Half Heat protection sleeve 1Sticker ASTOTHERM PLUS

* calibration is required, see section 4 of this repairing instructions; an exact setting can only carried out with the interface and the accompanying software or by the manufacturer! Comment: Operating boards (only for glass NTCs) can used for 41°C or 43°C devices by transferring a corresponding data file. Because of different temperatures of the safety cut-offs (hardware) it is not possible to change transformer boards between 41°C and 43°C devices!

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ASTOTHERM PLUS Repair Instructions

When ordering please indicate always model number and serial number! 10

8510.0305.01

BUFFER (2 Pieces)

11

9750.4100.09

CABLE GLAND PG9 1Cable gland 1Counter nut

12

9750.4100.10

POWER SUPPLY CORD SCHUKO 1Power supply cord SCHUKO 1Cable tie 90mm

9750.4100.12

POWER SUPPLY CORD GREAT BRITAIN 1Power supply cord GREAT BRITAIN 1Cable tie 90mm

9750.4100.16

POWER SUPPLY CORD SWITZERLAND 1Power supply cord SWITZERLAND 1Cable tie 90mm

9750.4100.17

POWER SUPPLY CORD USA 1Power supply cord USA 1Sticker GROUNDING 1Cable tie 90mm

13

13a

9750.4100.00

BOTTOM PART OF HOUSING AP 200/220/260

9750.4101.00

BOTTOM PART OF HOUSING AP 200/220/260 - PA

9750.4102.10

BOTTOM PART OF HOUSING AP 200S/220S/260S WITH ASTOLINE DEVICE SOCKET

1Bottom part 1Sticker ASTO 2Buffer 2Cable tie 90mm

1Bottom part with drill-hole for equipotential bonding 1Sticker ASTO 2Buffer 2Cable tie 90mm

1Bottom part with drill-hole for ASTOLINE socket connector 1AL-Device Socket 1AL arrow sticker 1Sticker ASTO 2Buffer 2Cable tie 90mm 1Protective cap 1Crimp connector

9750.4103.10

BOTTOM PART OF HOUSING AP 200S/220S/260S - PA WITH ASTOLINE DEVICE SOCKET 1Bottom part with drill-hole for ASTOLINE socket connector and equipotential bonding 1AL-Device Socket 1AL arrow sticker 1Sticker ASTO 2Buffer 2Cable tie 90mm 1Protective cap 1Crimp connection

14

9750.4300.01

INTERMEDIATE RING

15

9750.5100.04

THREADED SHAFT

16

9750.5102.00

CLAMP RIGHT 1Clamp right 1Rectangular nut right 1Pad

17

9750.5100.01

BASEPLATE 1Base plate 1Identification label

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ASTOTHERM PLUS Repair Instructions

When ordering please indicate always model number and serial number! 18

9750.4300.02

SPACING BOLT (1 Piece)

19

9720.3725.02

O-RING 114.02 x 1,78 (2 Pieces)

20

9750.8100.00

HEAT PROTECTION SLEEVE AP

21

9750.3132.00

*HEAT EXCHANGER COMPLETE GROOVE 4MM 115/230V - 400W

2Half part Heat protection sleeve 1Axle 2Sticker ASTOTHERM PLUS 1Fixing cord

1Earth conductor 200mm mounted 4Insulating cover 1Ferrit-Ring 2Cable tie 90mm

9770.3132.00

*HEAT EXCHANGER COMPLETE GROOVE 6,7MM 115/230V - 400W 1Earth conductor 200mm mounted 4Insulating cover 1Ferrit-Ring 2Cable tie 90mm

n.g.

9750.8110.01

FIXING CORD HEAT PROTECTION SLEEVE

n.g.

9524.2620

FERRIT-RING

22

9950.2100.20

FIXING STRIP

23

9750.8230.00

ASTOLINE ACTIVE INSULATION 4 MM

9750.8231.00

ASTOLINE ACTIVE INSULATION 6,8 MM

24

9850.5100.10

KNURLED SCREW

25

9750.5103.00

CLAMP LEFT 1Clamp left 1Rectangular nut left 1Pad

26

9750.5104.00

HAND WHEEL 1Hand wheel with Nut M8 1Grip cover 1Head screw M4x8 1Washer A4,3

27

9750.5101.00

DEVICE FIXING AP COMPLETE

28

9750.8230.17

PROTECTION CAP for ASTOLINE device socket 1Protection cap 1Crimp connector

29

9750.8230.02

ASTOLINE DEVICE SOCKET 1AL device socket 1AL arrow sticker 1Counter nut

30

9750.8220.03

ASTOLINE BOARD 1AL-Board 2Pan head tapping screw

31

9750.8240.04

AL-INSULATION PLATE

* calibration is required, see section 4 of this repairing instructions; an exact setting can only carried out with the interface and the accompanying software or by the manufacturer!

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ASTOTHERM PLUS Repair Instructions

When ordering please indicate always model number and serial number! 32

9750.4184.00

EQUIPOTENTIAL RETROFITTING SET 1Earth conductor 150mm 1Connector dia. 6 mm 2Nut M6 2Washer R6,4 1Serrated lock washer V6,4 1O-ring 5x1 1Assembly plan 1Drilling gauge 1Sticker

33

9750.8230.20

AL-PLUG (for soldering) 1 AL arrow sticker

34

9750.4201.14

SET O-RINGS 4x1 MM 4 for housing screws 2 for handle 2Cable tie 90mm

35

9750.5101.11

SET O-RINGS 5x1 MM 4 for device fixing AP 1 for equipotential bonding plug 2Cable tie

n.g.

9850.6001.00

PACKAGE AP COMPLETE 1Internal carton 1Bottom insert 1Top insert 1Front insert 1Outer carton 1Sticker package AP blank

n.g.

9850.6003.01

OUTER CARTON SINGLE AP

n.g.

9850.6003.02

OUTER CARTON DOUBLE AP

n.g.

9850.6003.03

OUTER CARTON FOURFOLD AP

TEST-EQUIPMENT n.g.

9950.9000.02

POWER RESISTORS SET 4Pieces 15 Ohm 10 W "5 % 1Piece 100 Ohm 10 W "5 %

n.g.

9950.9082.01

n.g.

9950.9000.03

AL-TESTBOX (to test the ASTOLINE function of ASTOTHERM PLUS) CD-ROM AP Calibration Software 1 Interface (230 VAC) 1 Instructions “AP Calibration Program” 1 Instructions “Eliminating microprocessor faults”

n.g.

9950.9000.31

Test Thermistor to measure the temperature dependent on the resistance with multimeter and table

Revision: 5 – 02/2005

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ASTOTHERM PLUS Repair Instructions

2

General guidelines and principles for the repair of ASTOTHERM PLUS blood and infusion warmers

WARNINGS Only agencies with the necessary equipment for checking electrical safety are authorised to repair defective ASTOTHERM PLUS blood and infusion warmers. In any event, responsibility for the device in question passes to the person who repairs it. After any repair, the tests customarily specified/recommended in the country in question with respect to device safety (e.g. VDE 0751, servicing, modification and testing of medical electrical equipment) should be performed in addition to the tests described here. A repair report must be prepared as evidence, recording all the work and tests performed, including values measured, tester and test date (see template in appendix). The provision of technical documentation or spare parts does not constitute authorization from the manufacturer to open or repair the device.

Live parts are accessible during the various assembly steps and tests on the dismantled blood warmer! Electrical installation should therefore meet local specifications. (RCD safety switches are specified in Germany!) Any modification to the original state means that the device will lose its approved status. You should therefore use exclusively original spare parts. Individual components of the heat exchanger cylinder/transformer board/operating board unit may not be replaced. Electronics boards may be repaired only by the manufacturer. Any heat exchanger cylinder is an individual item from a heat engineering point of view, due to its complex production and the large number of influencing variables (production tolerances in the manufacture of the heating system, NTCs etc.). For this reason, every electronic temperature control needs to be specifically matched to “its” heat exchanger cylinder in order to achieve sufficiently small control fluctuation later on.

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ASTOTHERM PLUS Repair Instructions

The NTCs form the core of the blood warmer. Their sensitivity means that it is prohibited to change their position or replace them. When dismantling or assembling the device, ensure that the NTCs/their connecting wires are not damaged. Defective NTCs may be replaced only by the manufacturer. The complete heat exchanger cylinder/transformer board/operating board unit needs to be returned for this purpose. Note room temperature and ambient effects for all thermal test work! As the control temperature is set accurate to a few tenths of a °C, note the following points: C avoid external effects on the heat exchanger unit /electronics to be measured C no draughts C constant room temperature (20 to 26 °C) C keep out of direct sunlight C keep away from strong light sources A functional check (see Section 4) and a continuous duty test (see Section 9) must be performed after any repair to the device.

2.1

Responsibility of the manufacturer

STIHLER ELECTRONIC GmbH considers itself responsible for the safety and reliability of the ASTOTHERM PLUS only if: C exclusively all the operating and servicing instructions expressly mentioned by STIHLER ELECTRONIC GmbH have been used (see operating instructions), C all those carrying out such instructions are expressly authorised by the manufacturer to do so, C spare parts and components are replaced with original components, C the electrical installation of the room in question conforms to applicable national rules and regulations, C the ASTOTHERM PLUS is used in compliance with the operating instructions and the repair instructions if relevant.

Revision: 5 – 02/2005

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