Tuttnauer 6690 STS-1V Manual

OPERATION
&
MAINTENANCE
MANUAL
Prevacuum Steam Heated Autoclave
with Steam to Steam Generator
and Vertical Sliding Door
model 6690 STS-1V
S/N: 2301006, 2301007, 2301011, 2301012, 2301013,
2301014, 2301015, 2301016, 2301017, 2301018
Cat.No.: MAN205-0211-002 Rev: C
Manufactured by: Tuttnauer Co. Ltd., P.O.Box 35292, Jerusalem, Israel Tel: [phone], Fax: [phone]

Table of Contents
Incoming Inspection ---------------------------------------------------------------- 1
1. General Information
1.1 Introduction ---------------------------------------------------------------------- 2-3
1.2 Standards --------------------------------------------------------------------------- 3
1.3 Specifications ----------------------------------------------------------------------- 4
1.4 Steam Data-------------------------------------------------------------------------- 4
2. Functional Description
2.1 The Steam to Steam Generator ----------------------------------------------- 5
2.2 The Water Pump------------------------------------------------------------------- 5
2.3 The Piping System ------------------------------------------------------------- 6-7
2.4 The Pneumatic Control System -------------------------------------------- 8-9
2.5 The Water Quality ---------------------------------------------------------- 10-11
2.6 The Electric System ------------------------------------------------------------ 12
2.7 Control System -------------------------------------------------------------- 13-15
3. Sterilization Programs --------------------------------------------------- 16-39
4. Control and Monitoring
♦ Control Panel 'CAT 2007' --------------------------------------------------------40
4.1 Description of panel 'CAT 2007'---------------------------------------------- 41
4.1.1 Keypad ----------------------------------------------------------------- 41-42
4.1.2 Display ----------------------------------------------------------------- 43-44
4.2 Description of Displayed Messages and Safety Measures ------- 45-46
4.3 Operating the Control Panel
4.3.1 Starting up the system ------------------------------------------------- 47
4.3.2 Selecting a Cycle ---------------------------------------------------- 48-50
4.3.3 System Setup -------------------------------------------------------- 51-53
4.3.4 Changing cycle parameters -------------------------------------- 54-58
4.3.5 Test Programs ------------------------------------------------------- 59-60
4.3.6 Display function ---------------------------------------------------------- 61
4.3.7 Display during a cycle ---------------------------------------------- 62-63
5. Calibration ------------------------------------------------------------------------- 64
5.1 Calibrating temperature and pressure ------------------------------------- 65

Table of Contents
5.1.1 Temp 1 --------------------------------------------------------------------- 65
5.1.2 Temp 2 --------------------------------------------------------------------- 66
5.1.3 Temp 3 --------------------------------------------------------------------- 66
5.1.4 Temp 4 --------------------------------------------------------------------- 66
5.1.5 Chamber Pres ------------------------------------------------------------ 66
5.1.6 Jacket Pres ---------------------------------------------------------------- 66
5.1.7 Gen Pres ------------------------------------------------------------------- 66
5.1.8 D1 Pres----------------------------------------------------------------- 66-67
6. Transportation of the Autoclave -------------------------------------------- 68
7. Preparation before Sterilization----------------------------------------- 69-70
♦ Loading and Unloading ---------------------------------------------------------70
8. Installation Instructions --------------------------------------------------- 71-72
9. Operating Instructions -------------------------------------------------------- 73
♦ Control Panel -----------------------------------------------------------------------74
10. Printer
10.1 Printer Operation ---------------------------------------------------------- 75-76
10.2 Printer Handling --------------------------------------------------------------- 77
11. Maintenance of the Autoclave
11.1 Preventive and Periodical Maintenance --------------------------------- 78
SERVICE INSTRUCTIONS
11.2 Safety Tests after Repair----------------------------------------------------- 80
11.3 Troubleshooting ------------------------------------------------------------ 81-85
11.4 Troubleshooting for the Water Pump ‘SHURFLO’ --------------------- 86
11.5 Pressure Switch --------------------------------------------------------------- 87
11.6 Absolute Pressure Transducer --------------------------------------------- 88
11.7 Cleaning and replacing the Water Level Electrodes ------------------ 89
11.8 The GEN - PROTEC electronic board ------------------------------------ 90
11.9 Water Pump Rear Endbell Replacement Kit ------------------------ 91-92
11. 10 Door Oil Piston --------------------------------------------------------------- 93
11.10 Dismantling the Cabinets side panels ---------------------------------- 94

Table of Contents
12. Spare Parts ------------------------------------------------------------------ 95-96
13. Valves Numbering -------------------------------------------------------- 97-98
14. Pressure and Temperature Table for Saturated Steam------------ 99
Drawings
♦ The Pneumatic Control System Drawing ------------------------------------- 9
♦ Vertical Sliding Door------------------------------------------------------------- 100
♦ Vertical Door- Locking Mechanism ------------------------------------------ 101
♦ Piping drawing ------------------------------------------------------------------- 102
♦ Electric drawing for the Autoclave ------------------------------------------- 103
XPCS Manual ------------------------------------------------------------------104-117
♦ Steps for modem connection-------------------------------------------------- 117

Page 1 of 117 pages
INCOMING INSPECTION
The instruments (products) should be unpacked and inspected for mechanical
damage upon receipt. Observe packing method and retain packing materials until the
unit has been inspected.
Mechanical inspection involved checking for signs of physical damage such as:
scratched panel surfaces, broken knobs, etc.
If damage is apparent, file a claim with the carrier. The manufacturer is responsible
for products shipped F.O.B. These products are carefully inspected prior to shipment
and all reasonable precautions are taken in preparing them for shipment to assure
safe arrival at their destination.
WARRANTY
We certify that this instrument is guaranteed to be free from defects in material and
workmanship for one year against faulty components and assembly with the
exception of glassware, lamps and heaters.
The warranty does not include and does not replace routine treatment and preventive
maintenance to be performed according to instructions in paragraph 11.1 'Preventive
and Periodical Maintenance'.
Our obligation is limited to replacing the instrument or parts, after our examination, if
within one year after the date of shipment they prove to be defective. This warranty
does not apply to any instrument, which has been subjected to misuse, neglect,
accident or improper installation or application, nor shall it extend to products, which
have been repaired or altered outside the factory without prior authorization from us.
The Autoclave should not be used in a manner not described in this manual!
Note
If there is any difficulty with this instrument, and the solution is not covered in this
manual, contact our representative or us first.
Do not attempt to service this instrument yourself.
Stipulate the model and serial number and describe the difficulty as clearly as
possible so we may be able to diagnose the problem and hence provide a prompt
solution.
For technical information or service please contact our representative at:
Tuttnauer USA Co.
25 Power Drive Hauppauge
NY, 11788, USA
Tel:[phone]
¬Fax:[phone]
Email: [email protected]
Our web site: www.tuttnauer.com

Page 2 of 117 pages
1. GENERAL INFORMATION
1.1 Introduction
This autoclave is a pre-vacuum sterilizer designed to cover a large field of applications
for hospitals and medical centers as well as pharmaceutical and biotechnological
industries.
The autoclave operates with saturated steam as the sterilizing agent, and has a
temperature of up to 279ºF and pressure up to 40 psi.
The autoclave is constructed of stainless steel, having a double - walled structure
and is equipped with a steam to steam generator, which supplies clean steam to the
chamber for the sterilization process. There are separate steam lines from the steam
to steam generator to the chamber and from the building steam supply to the jacket.
The autoclave is equipped with one vertical sliding door operated by a hydraulic
system, through two oil cylinders mounted laterally on both sides of the door. The
command pressure of compressed air is transmitted to the oil in the cylinders and
converted into hydraulic pressure, which pushes the pistons up or down, for closing
or opening the door.
The sealing of the chamber is achieved through a heat resistant silicone gasket,
located in a groove on the front side of the autoclave. The gasket is pushed against
the door by steam pressure introduced in the groove, behind the gasket.
Twelve sterilization programs are available, four are intended for unwrapped
instruments (gravity), four for wrapped instruments and packages and four for liquids.
Two test programs are also available, the VACUUM TEST for checking the tightness
of the chamber and piping system and the BOWIE DICK test enabling to check the
efficiency of the sterilization process.
The control system of the sterilizer is based on " State-of -the -Art" microcomputer
technology, ensuring a highly reliable and safe operation. The computerized control unit
ensures a fully automatic operation through the entire cycle, hence after setting the
pre-selected data and starting the operation, no further intervention is necessary.
The selected program, the main phases of the cycle and the status of the machine are
controlled and displayed on digital readouts. For process documentation, the important
information concerning operation is printed in hard copy.
For optimal control accuracy of the sterilization parameters, the system is equipped with
three temperature sensors, three pressure transducers and a pressure switch having
the following functions:
♦ The temperature sensors: 2 measuring the condense temperature (control and printout)
and the drain control output.
♦ The pressure transducers: the chamber pressure (control and monitoring), the jacket
pressure (control) and gasket pressure.
♦ The pressure switch regulates the steam pressure output of the steam generator.
Four pressure gauges measure the gasket, jacket, chamber and steam generator
pressure.
A programming mode, which can be entered by an access code, enables the technician
to set a number of additional parameters and operation modes.

Page 3 of 117 pages
The keyboard located on the front panel enables the operator to start and stop the
cycle.
Only the responsible person has access to select the program and change the
major parameters by using the key.
Optionally, a personal computer can be connected to the control system, through the
interface board RS232, which can be, operated 8 meters away from the autoclave.
The PC, operating under WINDOWS displays the status, data and processing in real
time in graphic and digital form at the same time recording and logging the data.
The communication PC-control unit enables the complete control of the autoclave
through the PC, including program selection, starting and stopping the cycle, setting
of parameters and the real time clock (data and time of the day).
1.2 Standards
This autoclave meets applicable requirements of the following standards:
1. A.S.M.E. Code, Section VIII Division 1 for unfired pressure vessels.
2. HTM 2010 – Sterilization and HTM 2031 - Clean Steam for Sterilization.
3. Complies with AAMI/ANSE ST8- Hospital Steam Sterilizers.
4. Complies with Underwriters Laboratories (U.L 2601-1) requirements
Tuttnauer is approved for ISO 9002 (Quality Systems), EN 46002 (Quality
Systems for Medical Devices) and ISO 13488 (Quality systems for Medical
devices – Particular requirements for the application of ISO 9002).
.

Page 4 of 117 pages
1.3 Specifications
Product data Model 6690 – 1V
W26’’ (660 mm.)
H26’’ (660 mm.)
Chamber Dim.
D36’’ (1070 mm.)
Chamber volume 467 l.
W1215 mm.
H1990 mm.External dim.
D1450 mm.
Net Weight 1150 kg (2540 lb)
Degree of protection IPX 4
Utilities
Steam supply
1’’, 50-80 PSI,
160 Lbs/Hr Peak
88 Lbs/Hr Av
g
.
Cold water supply
Maximum hardness value 72-215 TDS of CaCO3
Recommended tem
p
erature 59°F
¾’’, 50-80 PSI,
12.5 GPM Peak
275 GPH Avg.
Compressed air requirements Pressure 90-110 PSI, 3.5 SCFM
3/8" thread connection.
Electrical data:
Voltage 1 ph, 115V/60Hz
Utility 10 A
Current Consumption 6A
1.4 Steam Data
Working pressure 4 Bar (59 psi)
Test pressure 15.5 Bar (228 psi)
Safety relief valve 5 Bar (75 psi)
Plant Steam (Input) Generated Steam (Output)
pressure
(bar)
Temp.
(°C)
Rate
Kg/h
pressure
(bar)
Temp.
(°C)
Rate
Kg/h
8 176 137 2.6 140 116
7 171 88 2.6 140 80
6 165 52 2.6 140 47
5 159 24 2.6 140 22

Page 5 of 117 pages
2. FUNCTIONAL DESCRIPTION
2.1 The Steam to Steam Generator
The steam for the sterilization process is supplied from the building main steam
supply to a built in steam to steam generator, which produces clean steam and is
directly connected to the autoclave chamber.
Water to the steam generator is supplied by a single-phase pump, from a water
reservoir, which is connected to a source of distilled or mineral free water.
A water level control system, consisting of two electrodes mounted on top of the
boiler and connected to the electronic control board maintains through the pump
and a solenoid valve, a constant water level and ensures a safe operation of the
steam to steam generator.
A pressure switch connected through the electronic board regulates the output
steam pressure. A safety relief valve blows off at a pressure of 40 psi, to prevent
build-up of overpressure in case of control failure.
Only mineral - free water or distilled water will be used for operation of the
generator. See also par. 2.5 ‘Water Quality’.
2.2 Water Pump for the Steam Generator
The suction of the pump is connected to the water reservoir filled with mineral-free
water and mounted on the side of the autoclave. The mineral water is heated to
80ºC and maintained at this temperature so that the steam obtained from this
water has a low content of non-condensable gases. A PT100 temperature sensor
controls the water temperature.
A float valve keeps a constant level of water and prevents an overflow of water out
of the reservoir.
A lower float switch stops the operation of pump and heaters, when the water level
drops below this switch.
The Vacuum Breaker
When the generator cools down, it generates vacuum inside.
The vacuum breaker breaks it so that the generator won’t draw water from the
mineral free water reservoir.

Page 6 of 117 pages
2.3 The Piping System
The piping system of the autoclave consists of air-operated ball valves, which
control the water, condensate and steam flow in and out of the chamber, operate
the vacuum pump, and the air inlet valve. The air pulses to the pneumatic valves is
transmitted through solenoid pilot valves, operated at 24VDC.
The functions of the valves are as follows:
Air-operated valves
Steam to jacket (91); introduces steam from outer source to jacket, to heat the
jacket during the sterilization phase.
Steam to chamber valve (93); introduces clean steam from the steam to steam
generator into the chamber, for heating and maintaining the chamber temperature
during the sterilization phase.
Steam inlet to the generator valve (95); introduces steam from the building steam
supply into the steam to steam generator for producing clean steam.
Air inlet valve (43); introduces filtered atmospheric air at the end of the cycle to
break the vacuum and enable the opening of the door.
Fast exhaust to drain valve (73); evacuates the steam from the chamber to drain
at a fast rate, until pressure goes down to zero, in the prevacuum and post -
sterilization phases.
Condense valve (74); evacuates the condense from the chamber in the heating
and sterilization phases and isolates the chamber from the drain pipe during the
vacuum generation. It operates like a slow exhaust valve at the end of the liquids
program.
Exhaust to ejector valve (75); works together with the vacuum valve and connects
the chamber to ejector to create vacuum in the chamber.
Feed water to ejector valve (15); controls the flow of water through the ejector to
produce vacuum in the prevacuum and dry stages.
Mineral free water inlet valve (21); flows water from the mineral free water
reservoir and prevents hot water to return from the steam to steam generator to
the reservoir.
Drain cooling valve (13); flows water to drain, to cool the drain during the steam
and condense evacuation.
Pressure to gasket valve (94); controls the compressed air pressure to the door
gasket. When the door is closed, air enters through the valve into the groove
behind the gasket pushing it against the door to seal the chamber.

Page 7 of 117 pages
Vacuum to gasket valve (53); connects the gasket groove to the ejector. While the
door is moving during the opening or closing - the valve is open and vacuum is
produced to pull the gasket inside the groove, ensuring the smooth sliding of the
door. When the door is open, this valve is operated but vacuum is not produced.
The commands of the two valves are achieved by means of two solenoid valves.
The two valves work in opposition, at any moment when one of them is open the
other is closed, as described above.
Solenoid - Operated Valves
Besides the pilot solenoid valves which control the air - operated valves, the
following solenoid valves have direct action as described below:
Close door valve(39); is a solenoid valve which transmits compressed air to the
door cylinders for closing the door.
Open door valve(38); is a solenoid valve which transmits compressed air to the
door cylinders for opening the door.
Air supply valve (31); is a solenoid valve which transmits compressed air to the
manifold branch solenoid battery for the command of pneumatic valves.
It ensures that the valves control and doors driving are active, only if the electrical
power supply is present.
Note: The valves numbers are in accordance with the valve numbering list
and piping diagram at the end of the manual.

Page 8 of 117 pages
2.4 The Pneumatic Control System
The control of the pneumatic valves is done through compressed air, as described
below:
The pneumatic valves are air-air control type, fitted with two commands, an
opening command received through solenoid valve at a pressure of 6 bars - output
by the control system and a permanent closing command at a pressure of 3 bars,
connected to all valves.
The pneumatic control system is built as follows (refer to drawing on the next
page).
The incoming compressed air supply at a pressure of 7-8 bars is set by means of
a pressure regulator at 6 bars and transmitted to the entrance of the pilot solenoid
valve battery.
The solenoid valve battery is mounted on a manifold branch base, through which
all the solenoids are connected to the compressed air supply.
At the output side of the manifold branch, a pressure regulator at 3 bars sets the
compressed air.
As long as a pneumatic valve does not receive from the control system an opening
command the close command which is permanently present will determine the
shut-off position of the valve.
When an open command at 6 bars reaches a pneumatic valve, it overcomes the
opposite close command at 3 bars, and sets up the valve in position open.
A non-return valve mounted between the outlet side of the manifold branch and
the pressure reducer prevents the flow of air from the air reservoir to the solenoid
battery.
One safety measure is provided, a pneumatic control three-way, two-position
steam activated air returned valve, to prevent the possibility of opening the door
when pressure is introduced in the chamber.

Page 9 of 117 pages

Page 10 of 117 pages
2.5 Water Quality
2.5.1 Steam to Steam Generator
The distilled or mineral – free water supplied to the steam to steam generator
should have the physical characteristics and maximum acceptable level of
contaminants indicated in the table below:
Physical Characteristics and Maximum acceptable contaminants levels
in water or steam, for steam generator
(In compliance with ISO 11134 and ISO 13683).
Evaporate residue <15 mg/l
Silica <2 mg/l
Iron <0.2mg/l
Cadmium <0.005 mg/l
Lead <0.05 mg/l
Rest of heavy metals <0.1 mg/l
Chloride <3 mg/l
Phosphate <0.5 mg/l
Conductivity <50 µs/cm
pH 6.5 to 8
Appearance colorless, clean, without
sediment
Hardness <0.1 mmol/l
Compliance with the above data should be tested in accordance with
acknowledged analytical methods, by an authorized laboratory.
Attention:
The use of water for autoclaves that do not comply with the table above may
have severe impact on the working life of the sterilizer and can invalidate the
manufacturer’s guarantee.
The use of soft water is strictly forbidden!
2.5.2 Water for the Vacuum System and the Drain Cooling
The feed water supplied to the liquid ring vacuum pump/ejector must meet the
following requirements:
♦Hardness: 0.7 - 2 mmol/l, 4-12 °(German) of CaCO3,
7.2-21°(French) of CaCO3, 72- 215 mg/l of CaCO3

Page 11 of 117 pages
2.5.3 Reverse Osmosis
A Reverse Osmosis (RO) system may be used to improve the quality of the water
used to generate steam in the autoclave chamber.
In RO, the water is forced through a semi-penetrable membrane, which filters out
contaminants to a high degree of efficiency. In deionisation (DI) ions and charged
particles are removed either by electric fields or by ion exchange in resin beds.
Although the RO cannot normally attain the degree of purity possible with the DI
methods, it is more than adequate for the feed water intended for clean-steam
generators.
Moreover the RO has several advantages:
1. RO is cheaper to install and to run than DI.
2. RO removes particulate matter, organic molecules and pyrogens that DI
cannot remove
3. RO water is less corrosive to steel and copper than DI water.
4. RO maintenance requirements are less demanding than those of the DI
units.
Therefore the use of mineral free water will contribute to better performance and
longer life of the autoclave.
NOTE!
Please consult a water specialist.

Page 12 of 117 pages
2.6 The Electric System
The electric system of the autoclave comprises of the power circuits, including the
commands, switching and protective components, required for the operation of the
electric equipment of the machine.
The following parts are located in the electric box, mounted on the side of the
autoclave.
♦ The solid state relays for the command of the heaters, water pump and
ejector.
♦ The circuit breakers for protection of all power circuits.
♦ The power supply for powering of electronic circuitry and solenoid
valves.
♦ Two protective relays.
♦ The wiring and connection elements.
♦ The main switch.
The power circuits of the steam generator and the vacuum system are connected
to the terminals in the electric box at a one-phase voltage, 1x 115V\60Hz.
It is important to achieve a steadfast grounding screw connection to the
metal-sheet enclosure of the electric box and metal parts of the autoclave.
The earth installation at the customer’s site must be built in compliance with the
laws and regulations in force and International EN 61010-1 electrical safety
standards and certified by the competent authorities.
Description of the Electrical Equipment
The command signal for the contactor is output by the micro-controller through a
solid state relay. The water pump of the generator is driven by the solid state relay,
the command signals are output by the micro-controller system.
The command circuits are energized by a power supply with four outputs, as
indicated below:
♦ 5 VDC for the digital circuits.
♦ +12VDC and – 12VDC for the analog circuits
♦ 24 VDC for the solenoid valves.
The coils of the solenoid valves are connected with an end at +24V and with the
other end to the control output of the controller.
The command is active; i.e. the solenoid valve is actuated when the control
voltage output is low (less than 2V) with respect to ground.
Circuit breakers attain the protection of the electric and electronic circuits operated
in direct current and current limiting circuits, inside the power supply stabilizers.
Two protective relays are designed to stop the pump operation in case of
interruption of the other phases and save the important data from the RAM
memory in case of power failure.

Page 13 of 117 pages
2.8 Control System
The Main Board
Contains the electronic microcontroller system, which controls and monitors the
physical parameters of the process and performs the operation sequence of the
machine according to the selected program.
The dimensions of the main board are 30x15x10cm.
The main board contains the following elements:
♦ 16 digital inputs
♦ 24 digital outputs
♦ 6 PT 100 inputs
♦ 7 Inputs of 4 –20mA
♦ voltage inputs for the electrode for water level
♦ 2 analog outputs of 4 –20mA
♦ Serial ports
♦ CPU.
♦ 2 ADC's for reading temperature and pressure sensors.
Each ADC maintains at least 3 temperature sensors (PT100), and 3 pressure
sensors (4 –20mA).
All connections to the main board are via rigid contactors for quick, efficient and
dismantling and transport.
Digital Inputs
The digital inputs are φ/1:
♦ open/close for door positions
♦ safety cut-off switches
♦ pressure cut-off switches
♦ cut-off switches for water level
The input voltage will not exceed 24VDC. The input must be protected from high
voltages by means of an Opto-coupler.
Digital Outputs
Digital outputs are used to activate solenoid valves, relays and SSR for the pump.
The command is 24 VDC, but this will be able to be changed and allowed to move
between 10-30VDC.
Each output is up to 2A, however all the outputs together will not have a capacity
greater than 110 W.
Analog inputs for Reading Temperature
Temperature is measured using PT100.
The system contains 2 ADC components, each component being able to read 3
PT100 sensors. The system contains circuits with a straight connection of PT100
(3 wires) that do not interchange on the way.
The measurement range is 77-302oF(25-150ºC).
The resolution range is 32.18oF (0.1ºC).
The accuracy of the measure is 33.8oF (1ºC).
The accuracy surrounding the sterilization temperature at the time of sterilization is
in the range of + 32.9oF (0.5ºC).
Calibration of the temperature circuit requires a special code.

Page 14 of 117 pages
Analog Inputs for Reading Pressure
The system contains 6 inputs for reading pressure from 4 – 20mA sensors. There
are at least 3 sensors on each ADC.
The pressure reading occurs from inside the chamber, the steam entrance, and
sealed doors.
Each sensor has an output of 4mA. The system allows the measurement range of
the sensor to be set by external software.
Measuring pressure in chamber
The display and printing scale is in kPa.
The measurement range is 0-400kPa absolute.
The resolution measurement and display is 1 kPa.
The accuracy of the measurement is a maximum 1% from the range, i.e.4kPa
Calibration of the pressure circuit needs a special code.
Measuring jacket pressure
The measurement range is 0-400kPa absolute.
The resolution measurement and display is 1 kPa.
The accuracy of the measurement is a maximum 1% from the range, i.e. 4kPa
Calibration of the pressure circuit needs a special code.
Measuring generator pressure
The measurement range is 100-600 kPa (absolute).
The resolution measurement and display is 2kPa.
The accuracy of the measurement is maximum 1%from the range i.e. 5kPa.
Calibration of the pressure circuit needs a special code.
Measuring the pressure of a gasket
The measurement range is 0 – 400 kPa absolute.
The resolution measurement and display is 1kPa.
The accuracy of the measurement is maximum 1% from the range, i.e. 4kPa
Calibration of the pressure circuit will need a special tool or code.
Voltage Inputs for Water Level Electrodes
Water level electrodes may be placed at a few points in the autoclave. Due the
experience accumulated at “Tuttnauer”, it was determined a maximum of 3
water-level measuring points are required for the sterilization process. The points
are as described below:
If the autoclave is equipped with a steam generator, 2 water level measuring point
are required. The lower electrode stops the operation of the generator if the water
level decreases below the minimum required to produce steam. The upper
electrode controls the switching on of the water pump.
When sterilization or cooling is performed by water entering the chamber, water
level measuring is required. This measuring is performed by one water level
electrode.
The electrode used for measuring water level is made of a gold-coated stainless
steel rod. The electrode closes an electric circuit when its tip touches the water.

Page 15 of 117 pages
4 Serial Ports
The control system contains 4 serial ports according to the following specifications:
♦ Serial Ports for the connection of up to 2 command panels (RS485).
♦ 1 Serial Port connected to an external PC computer (RS232).
♦ 1 Serial Port connected to an internal PC computer that will work as an
activating panel (RS232).
If it will be necessary to convert some functions or to reprogram or to reload the
software of the autoclave from distance, a modem can be connected using
above-mentioned ports. This enables the service technicians to attend the
machine from miles away, using the ADMC software thus allowing full control of
the machines.