ATMOS S351, S 351 Natal User manual

English

MedizinTechnik

... for a better life

ATMOS S 351
ATMOS S 351 Natal

Serviceanleitung

ATMOS MedizinTechnik
GmbH & Co. KG

Ludwig-Kegel-Str. 16
79853 Lenzkirch / Germany

Tel. [phone] / 6 89-0
Fax [phone] / 6 89-190

FO.04

[e-mail]
www.atmosmed.de

2

7.0 Spare Parts ........................................ 35 - 36

8.0 Technical Specifi cations .......................... 32

9.0 Conversion instructions .......................... 33

9.1 Trolley .........................................................33

10.0 Annex (Plans) ....................................34 - 38

Page

1.0 General description ................................... 3

1.1 Valid operating instructions .......................... 3

1.2 Information on manufacturer ........................ 3

1.3 Exclusion of liability ...................................... 3

1.4 For your safety ............................................. 3

2.0 Installation .................................................. 4

3.0 Unit function and

construction of the unit ...................... 4 - 12

3.1 Functional description .................................. 5

3.2 Description of sub-assemblies ..................... 5

3.2.1 Housing ........................................................ 5

3.2.2 Collection jar system with hose

connections and bacterial fi lter ..................... 5

3.2.3 Internal components ..................................... 6

3.2.4 Electronics ............................................... 7 - 8

3.3 Allocation of wires to the plug ...................... 9

3.4 Test and measuring points ........................... 9

3.5 Service Mode ............................................. 10

3.5.1 Service Level 1 ........................................... 10

3.5.2 Service Level 2 .................................... 10 - 12

4.0 Changing parts .................................. 13 - 15

4.1 Removal and fi tting of the housing ............. 13

4.2 Removal of the pump module .................... 13

4.3 Membrane and valve change ..................... 13

4.4 View of pump .......................................14 - 15

5.0 Trouble-shooting ...................................... 16

5.1 General errors ............................................ 16

6.0 Maintenance and repair .................... 17 - 34

6.1 Test procedure ........................................... 17

6.1.1 Visual inspection ........................................ 17

6.1.1a Suction device-setting-locking .................... 17

6.1.2 Electrical testing .................................. 18 - 19

6.1.3 Functional test of ATMOS S 351 ......... 20 - 23

6.1.4 Functional test of ATMOS S 351 Natal: .........

Vacuum extraction ............................... 24 - 26

6.1.5 Functional test of ATMOS S 351 Natal:

Suction ................................................ 27 - 29

Contents

3

The ATMOS S 351 is a surgical suction unit which is used

in medical ranges to remove bodily fl uids (secretions)
and rinsing fl uids by means of a vacuum generated in

the suction system. The variants of the ATMOS S 351
are used in obstetrics, during eye operations and for

intermittent drainage.

1.1 Valid operating instructions

The ATMOS S 351 is manufactured in 3 variants:

• ATMOS S 351

• ATMOS S 351 Natal

The ATMOS S 351 Natal provides for a comfortable
realisation of vacuum extractions.

1.2 Information on manufacturer

Further information, accessories and spare parts are
available from:

The operating instructions relating to the ATMOS S 351
form part of these service instructions. The persons
authorized for service work must be familiar with the
contents, the kind of installation, the start-up as well as
the operation described therein.

ATMOS

MedizinTechnik GmbH & Co. KG
Ludwig-Kegel-Straße 16
79853 Lenzkirch
Deutschland
Tel. + 49 (0) 76 53 / 6 89-0
Fax: + 49 (0) 76 53 / 6 89-190
+ 49 (0) 76 53 / 6 89-493 (Service Center)
[e-mail]
www.atmosmed.de

ATMOS Current issue
S 351, S 351 Natal
Software control 2.0 (or higher)
Software, CAN –
Hardware control 1.1
Operating instructions:
ATMOS S 351 444.0405.A
ATMOS S 351 Natal 444.0401.A



Information which is of particular interest to the

user is printed in a box throughout this manual.

1.4 For your safety

Please also pay attention to chapter 2.0 "For your safety"
in the operating instructions.

Maintenance and/ or opening and repair of the ATMOS
S 351 may be carried out only by an expert authorised by
the manufacturer. When doing this, technical and hygienic
protective measures are to be taken.

When assembling the housing, particular care is to be
given to the electric cabling and the silicone hose. These
must not be bent sharply or get caught. If necessary, the
lines should be retracted somewhat into the rear housing
shell.

In case of improper maintenance or repair of the appliance
and the use of non-original parts the product liability of
the manufacturer will become forfeited. When opening the
appliance during the period of guarantee the guarantee
given by the manufacturer will be forfeited.

When the appliance is decommissioned at the end of its
service life and is to be disposed of, the components are to
be given separately into the various recycling processes.
The same regulations are to be observed concerning the
disposal of replacement parts.

 Before opening the ATMOS S 351 for service

work, switch off the unit and remove the power cab-

1.3 Exclusion of liability

ATMOS assumes responsibility for the unit, as far as safe­ty, dependability and functionality are concerned, only if

– assembly, readjustment, modifi cations, extensions or

repairs are carried out by ATMOS or by persons autho­ rized by ATMOS,
– only original ATMOS parts are used and,
– the unit is used in compliance with the operating
instructions.

1.0 General description

4

See chapter 4.0 "Installation and commissioning" in the operating instructions.

3.0 Unit function and unit construction

Fig. 1. Block Diagram

Exhaust
air valve

Starting
valve

Pump

Silencer
(in the housing)

Fan

Display and key­board

Connecting
nipple

Mains input

Processor board

Overfl ow

contacts,
right

Overfl ow

contacts,
trolley

Overfl ow

contacts,
left

Foot
controller
connection

Buzzer

Pressure
sensor

ATMOS S 351 Housing

2.0 Installation

5

3.2 Description of the sub-assemblies

The ATMOS S 351 and its variant are made up of the
following components:
– housing
– collection jar system with hose connections and
bacterial ilter
– internal components (pump, processor board,...)
– electronics

3.1 Functional description

The main part of the suction unit is the diaphragm-type
pump (4). The motor of the pump is controlled by the
processor board (14). A pressure transducer (15) delivers
the actual vacuum to the processor board (14). The pump

(4) is driven until the desired fi nal vacuum is shown in the

safety glass and in the collection jar.

With the help of the vacuum generated, liquid passes
through the suction hose into the collection jar. A level mo-

nitor (overfl ow contacts (25, 27, 29) checks the resistance
between double socket nipple and an electrode fi tted in

the collection jar lid. If the resistance changes (by the
increasing liquid level in the collection jar) the pump (4) is
shut down and an acoustic signal is given by the buzzer
(32). Only when the double socket nipple is removed and
put into another collection jar is the suction unit again
ready for service.

The vacuum can be selected by 3 push buttons. A further
way of controlling the vacuum is with the foot controller.
This is connected to the sub-D-connection bush (22). If
vacuum is to be reduced, the exhaust air valve (3), which
is controlled by the processor board (14), opens. A tem­perature monitor (16) monitors the internal temperature
of the suction device. This controls the installed fan (13)
when required. If the temperature rises above a certain
limit (65ºC) then a warning is given. If the 2nd limit is excee­ded (85ºC) the unit is shut down and a corresponding fault
indication is given. The variant ATMOS S 351 and ATMOS
S 351 Natal have additional functions, which allow vacuum
creation and reduction over a predetermined time.

3.2.1 Housing

The housing of the ATMOS S 351 or its variant is made
of plastics (ABS UL).The main switch, the operating and

indicating strip, the connection bushes, the jar fi xings
(overfl ow contacts right (29) and left (25)) and the faste­ning nuts for the trolley (overfl ow contacts on the trolley
(27)) are fi tted on the housing.

3.2.2 Collection jar system with hose
connections and bacterial fi lter

The collection jars which can be supplied in various sizes

and materials (see technical specifi cations) are put into

the mountings provided. The collection jar lids then con-

tact the rails. As a result an electrical overfl ow protection
is provided by the overfl ow contacts (25, 27, 29). The

processor board (14) assesses the signals appropriately.

The electronics differentiate between ”no existing overfl ow”

(= resistance close to ∞), ”overfl ow present” and a ”short
circuit” (< 100 Ω). In addition on the signal input of the
trolley (27) the trolley is recognised. This is done by a
resistance installed in the trolley (1 MΩ ± 20%). Please
note that if using an older trolley the resistance may not
yet be installed (see Page 38: Trolley for ATMOS S 351
or modify its variant).

A hydrophobic bacterial fi lter must be fi tted in the airway

in front of the connection nipple (1) which prevents the
secretion being sucked into the pump and thus avoids a
bacteria contamination of the space inside the housing.
There are two ways of doing this:

1. Use of the bacterial fi lter that is included in the scope
of supply. This fi lter is fi tted in the pipework between
the connection nipple (1) and the overfl ow

container.

2. Use the bacterial fi lter that can be obtained as an
accessory in the overfl ow container. This bacterial
fi lter has a longer life and can be autoclaved.

Further details on this are given in the Operating
Instructions.



When using accessories, which are not provi-

ded especially for the ATMOS S 351 or its variant,

functional limitations may occur (overfl ow recognition,

short circuit).

3.0 Unit function and unit construction

6

3.2.3 Internal components

(2) Pipework on the vacuum side

The pipework on the vacuum side connects the
connection nipple (1), the exhaust air valve (3), the
pressure transducer (15) on the processor board (14)
to the pump (4, vacuum connection). The pipework is
manufactured complete with silicone hoses.

(3) Exhaust air valve

The exhaust air valve (3) serves to reduce the vacuum,
if the system (collection jar, etc.) is shutdown. The valve
is controlled by the processor board (14) with 12V dc.
The function can be tested in Service Mode 2.

(4) Pump

The pump (4) is supplied with mains voltage through the
processor board (14). The processor controls the pump
(4) until the preset vacuum is reached. When the vacuum
is reached the power supply is switched off. The function
can be tested in Service Mode 2.

(5) Start valve

The pump (4) does not start automatically under vacuum.
Therefore, when necessary the vacuum in the pumping
head of the pump (4) is reduced by the start valve. Since
the valve is located in the intermediate piping of the pump,
no reduction of vacuum occurs on the vacuum side. The
control of the valve (5) is done by the processor board
(14). The processor uses the running signal of the pump
which is reported by the control wire (11) to the processor
board to recognise a start.

(6) Pipework on the pressure side

The piping on the pressure side connects the pump
(4) with the silencer (7). The piping is made of silicone
hoses.

(7) Silencer

The silencer is integrated into the housing. The exhaust
air hose (6) is clamped in the silencer housing and se­cured with 5 screws and a cover plate. Noise absorbing

padding is fi tted in the silencer housing to absorb the

noise. The air passes out of the back of the housing to
the outside.

(13) Fan

The fan serves to cool the pump (4) and generally to
cool the inner space. The fan is supplied with 12V dc
by the processor board (14). The fan switches on at a
temperature of 45°C and off at a temperature of 40°C on
the temperature transducer (16).

(14) Processor board

The processor board serves to control and monitor the
ATMOS S 351. It forms the central unit. On the processor
board there is the processor, the power supply for the elec­tronics, the pressure transducer (15) and the temperature
transducer (16).

(18) Display and keyboard

The display and the keyboard are directly connected to
the processor board (14) with the ribbon cable (17). On
the ribbon cable (17) there are 2 ferrite cores for fault
clearance. The display is a graphic LC display with 128 x
64 pixels. The lighting is done by means of LEDs.

(22) Foot controller connection

In the standard component ATMOS S 351 the connection
is done directly through cable (23) to the processor board
(14). The foot controller connection consists of a 9 pole
Sub-D-Bush.

(25,27,29) Overfl ow contacts (left, trolley, right)

The overfl ow contacts are connected through the con-

nection wires (24, 26, 28) to the processor board (14).

The overfl ow recognition is done by a resistance measu-

rement.

(30) Mains input

The mains input consists of a cold device connection

box with integrated fuses and an EMC-fi lter. In addition a

potential equalisation bush is connected here.

3.0 Unit function and unit construction

7

3.2.4 Electronics

The description is done by means of function blocks.

• Block 1 Potential separation and production of

12V dc:

The supply voltage is connected at the entry to the

block. There is a switch to switch over between 115 and
230V ac. The transformer has an insulation designed
for a voltage of 4kV and supplies an output voltage
of 18V ac. The secondary winding is protected by a

fuse (0.6 AT). A bridge rectifi er is fi tted to rectify the

ac voltage.

• Block 2 Control of the motor:

The motor is connected through a semi-conductor relay.

This semi-conductor relay has an insulation designed
for 4kV. The control of the relay is achieved directly
from an output of the controller. If the input signal of
the motor is low, the motor is turned on.

• Block 3 Control of the 5V dc:

The 5V dc is controlled by an LM 2574 switch regula-

tor. The regulation is done by back coupling, which by
means of a voltage divider is taken back to the feedback
of the switch regulator. The switch regulator is short
circuit proof. The voltage is smoothed by capacitors.

• Block 4 Control of the 12V dc:

The 12V dc is controlled by an LM 2574 switch regula-

tor. The regulation is done by back coupling, which by
means of a voltage divider is taken back to the feedback
of the switch regulator. The switch regulator is short
circuit proof. The voltage is smoothed by capacitors.

• Block 5 Production of the negative 12V supply:

The negative voltage is produced by a charging pump

(IC 7660). It is fed by the positive 12V.

• Block 6 Reference voltage:

The 2.5V reference voltage is produced by a low power

band gap diode. The diode has a temperature coef-

fi cient of 50 ppm. All AD converter values are based

on this reference voltage.

• Block 7 Low pressure measurement:

A silicon transducer is fi tted to measure the low pressu-

re. The measuring bridge of the transducer is fed with
a constant voltage. This constant voltage is produced

by means of an amplifi er and the reference voltage.

U

sensor

= 10.025 V

In addition the measuring bridge is evaluated by

means of a difference amplifi er. The difference ampli­fi er amplifi es the signal, so that 1 bar under pressure

corresponds to 2.5V.

• Block 8 Motor rotation monitoring:

A refl ex light barrier is used to check whether the motor

is started in the switched on condition. The refl ex light

barrier consists of an LED and an open collector exit.
The light diode is fed through a pre-resistance of 5V.
The voltage differences on the open-collector-exit are
assessed by the comparator circuit of the OP2 and so
prepared that a rectangular signal is made available
to the controller.

• Block 9 Control of valves and fans:

The two valves (start and exhaust air) as well as the

fans are connected with a FET. The loads lie on one
side on +12V and are, if necessary, pulled with an
FET to GND. The FETs are controlled directly by the
controller. Two other FETs ensure that the intake and
outlet air valves cannot be connected while the reset
signal produced from the reset module is on. BYV27
diodes are used to prevent radio interference.

• Block 10 Brightness control of the LC - display:

The brightness of the LC display can be controlled with

the controller. The current through the LEDs to light the
display is controlled through a constant current source.
This constant current source is produced by means of
a shunt (R33) and an operation amplifi er. The target
value for the current source is given by the PWM signal
of the controller.

• Block 11 Indicator:

The connection to the indicator board is done by a

26 pole ribbon cable. The control of this LC display
and the two LEDs as well as the inputting of the push
buttons is done by means of this ribbon cable. The
control of the LCD graphic display is done by means
of the data bus and some generated control signals.
The LEDs lie on one side at +5V and are on the other
side pulled through a resistance with the controller to
GND. The push buttons are held with a Pull Up to +5V.
If a push button is pressed, the level falls to GND and
is registered by the controller.

• Block 12 Overfl ow contacts:

There are 3 overfl ow sources:

- overfl ow right

- overfl ow left

- overfl ow trolley
The overfl ow contacts are supplied from the reference

voltage through a resistance. The other side of the
contact is read with an AD converter of the controller.
If the resistance between the contacts is reduced, then
the voltage at the AD converter increases and can be
detected by the controller as safety glass.



The resistance values must not be reduced!

3.0 Unit function and unit construction

8

• Block 20 Adress latch:

An IC 74HC573 is used to latch the lower 8 address

wires (A0-A7). First the addresses are given over the
combined data/address bus and intermediately stored
by the 74HC573 before the data is read in or read out
over the data bus.

• Block 21 Eprom:

An Eprom 27C512 is fi tted as program memory.The

eprom has a storage capacity of 512 kbits and is orga­nised in 64k x 8 bit.

• Block 22 RAM:

An RAM HY6264A is fi tted as volatile memory. The

RAM has a storage capacity of 64 kbit and is organised
in 8k x 8 bit.

• Block 23 Address decoding:

A 74HC00 is used for the address decoding for the control
of the LC display. This decoding circuit has several
functions:

- The RD signal is inverted.

- The enable signal is generated by the connection
of the RD, WR and A15 signals.

• Block 24 AD-transducer setting:

This circuit part serves to adjust and fi lter the AD conver-

ter signal. An RC member fi lters the signals. A Z-diode

protects from over voltage.

• Block 25 Reset unit:

The reset-unit TC1232CPA has 3 functions:

1. Voltage monitoring: If an input voltage of 4.5V is excee­ded, the TC1232 sends a reset signal to the control­ler.

2. Watchdog function: A port is continually toggled by the
controller. If this toggeling is set for a time of more than
150 ms, the unit reports a reset to the computer.

3. Manual reset: If the J1 is short circuited the unit sends
a reset.

• Block 13 Temperature monitoring:

A PTC temperature transducer is used to monitor the tempe-

rature in the ATMOS S 351 or its variant. This temperature
transducer is read by the internal AD converter of the con­troller. Thus the fan can be switched on when necessary or
a high temperature reported. The following voltage values
are produced at the input of the AD converter.

Temperature Voltage

20°C 1.225 V

40°C 1.322 V
60°C 1.412 V
80°C 1.496 V

Table 3: Temperature values

• Block 14 CAN connection:

Is not used.

• Block 15 Buzzer:

The buzzer for acoustic output of warning signals is

switched with an FET from the controller.

• Block 16 Foot controller:

The foot controller is read with the help of the AD

converter. In order to guarantee a voltage at the
input of the AD converter of 0-1.9V a pre-resistance
of 15 kOhms is used. The resistance R35 is used to
recognise whether a foot controller is attached.

• Block 17 EEProm:

Various settings are stored in the EEProm 93LC66B.

The communication with the EEProm is done by
means of a serial SPI-bus.

• Block 18 Controller:

An 80C552 made by Philips is used as the controller.

The controller possesses the following features:

- 80C51 core

- 256 x 8 internal RAM, externally upgradable to
64k

- 3 independent timers

- 8x 10 bit AD - converter input

- 2x 8 bit PWM signals

- 5x 8 bit 1/O - Ports plus an 8 bit inlet port (ADC)

- a UART

- watchdog on chip

- 24 MHz type

• Block 19 Oscillator:

The oscillator is produced by a quartz crystal and

2 capacitors. The cycle frequency is 24 MHz.

3.0 Unit function and unit construction

9

3.3 Allocation of wires to the plug

Foot controller

Allocation of wires to the pins of the foot controller

3.4 Test and measuring points

The following measuring points are available on the control board:

Control board measuring point

Pin

1
2
3
4
5
6
7
8
9

Housing

Designation

GND

Schleifer potentiometer

Supply potentiometer

Screening

Type of signal

Low voltage

Low voltage
Low voltage

Earth

Designation

MOTOR

SENSOR

REF
RST

-5V

+5V
+12V
GND

Signal

Speed of the pump

Vacuum (amplifi ed)

Reference voltage

Reset

Negative supply

5 V supply

12 V supply

Mass/earth

Type of signal (valve)

5 v, rectangular

0 - 2.5 V

2.5 V

0 / 5 VDC

- 5 VDC

+ 5 VDC

+ 12 VDC

0 VDC

Remarks

2.5 V at 1 bar

3.0 Unit function and unit construction

10

3.5 Service Mode

The ATMOS S 351 or its variant differentiate between
2 Service Levels:

• Service Level 1: Serves to set the suction device.
This level is described in the Operating Instructions.

• Service Level 2: Serves to support the service.

3.5.1 Service Level 1

With the ATMOS S 351 you reach Service Level 1 if you
hold the "Standby" key down when switching on.

Functions of Service Level 1:

• Adjust Unity:
The units of the indicator can be changed over here:
mbar / kPa / mmHg.

• LCD Brightness:
The LCD background lighting can be adjusted here
(0 to 25)

• Adjust Intermit:
Adjustment of the Intermit-mode can be done here.
Read the description of this in the Operating Instruc-

tions.

3.5.2 Service Level 2

Overview of the functions of Service Level 2:

a) Show Errors:

Any errors that have occurred, including the error histo­ry, can be seen here.

b) Clear Errors:

Serves to delete the error memory.

c) Test Airtight:

The system tightness can be tested here.

d) Test Hardware:

The main functions of the suction device can be directly
tested.

With the ATMOS S 351 you reach Service Level 2 when
you hold the ”standby” and the intermittent key depressed
when switching on:

Select with the arrow keys the corresponding functions

and confi rm them by pressing on the ”Max” key. In order

to leave the service level press the ”Standby” key and the
”Extraction cup” key on ATMOS S 351 Natal

Fig. 2. Start picture Service Level 2



With the ATMOS S 351 Natal you get into the
Service Level 1, if you hold depressed the extrac­tion cup key or the eye key during starting; The
additional functions of Service Level 1 of ATMOS S
351, ATMOS S 351 Natal is described in detail in the
Operating Instructions.



With the ATMOS S 351 Natal you get into the
Service Level 2, if you hold depressed the suction
bell key or the eye key together with the ”End” key
during starting.

3.0 Unit function and unit construction

11

Fig. 3. Error memory

a) Show Errors

The error history can be used to make the search for
errors easier:

A maximum of 10 errors can be stored. If more than

10 errors occur then the fi rst 9 and the last error that

occurs are stored. The last error is always at the start
(Error 1).

The following errors are recognised and displayed by
the ATMOS S 351 or its variant:

Number of errors that have
occurred

Indicated error

Error designation

Error codes

b) Clear Errors

When the errors have been resolved the error memory
needs to be cleared again. Choose the ”clear errors”
function for this.

c) Test air tightness of system

This can test to what extent the total system is tight.

Connect all hoses/containers on the ATMOS S 351 or
its variant to be tested. Close the suction hose and start
the test with the ”max” key. It takes place as shown on
the adjacent display.

Fig: 4. Tightness test - Start diagram

Error Description of error Reaction of the ATMOS

S 351 or its variants

Possible sources of the

error

Key error A key is jammed or is

depressed for more
than 7 seconds

The device goes into
emergency operation, error
message is entered in the
error memory.

- Key jammed

- Parts on the keyboard

Motor sensor When the motor is

switched on the rotation
sensor gives no
feedback after
4 seconds

The device goes into
emergency operation, error
message is entered in the
error memory.

- Motor does not turn

- Motor sensor defective
or not correctly
positioned

- Motor control defective

Pressure
sensor

The pressure
measured is outside
the range.

The device goes into
emergency operation, error
message is entered in the
error memory.

- Hose on the wrong
sensor nipple

- Pressure sensor
defective

- Pressure sensor not
connected

Temperature If the temperature

exceeds 85ºC or falls
below -5ºC an error
message is given,
which is only erased
when the temperature
falls below 80ºC or
rises above 0ºC.

An acoustic signal sounds
every 10 seconds. The high
temperature symbol appears
on the display. The pump is
switched off. The error
message is entered in the
error memory.

- Temperature in the
suction device is too
high

- Ventilation slot blocked

- Surrounding
temperature too high

- Fan does not work

- Temperature
transducer defective

Overflow short
circuit

If the contacts of the
overflow are short
circuited (<100Ω) an
error message is given

Every 10 sec error message
in the display as well as
buzzer for 1 second. The
error message is entered in
the error memory

- Contacts shorted

3.0 Unit function and unit construction

12

The ATMOS S 351 or its variant begin to create vacuum
(Phase 1, as shown). Then there is a waiting time (Phase
2, ”wait”).

Fig. 5. Tightness test - Test

The test result is shown with a box. Then start a new test
run with the ”Max” key or end the function with the ”Stand­by” key, ”Extraction cup” key with ATMOS S 351 Natal.

The example shows a tight system.

Fig. 6. Tightness test - Result

System is leakingSystem is tight

d) Test Hardware

This function serves for the targeted testing of individual
components. Chose the function to control the valves, fan
or pump directly:

• Fan on/off with the "intermittent" key for the ATMOS
S 351, with the "extraction cup" key for the ATMOS
S 351 Nata;

• Exhaust valve on/off with the "arrow left" key
(valves – exhaust)

• Starting valve on/off with the "arrow right" key
(valves – starting)

• Pump on/off with the "max" key (pump)

Fig. 7. Test hardware

Fan

3.0 Unit function and unit construction