Heraeus UT 6 P, UT 12 P, UT 20 P Laboratory Air Circulation Oven INSTRUCTION MANUAL

(GET) INSTRUCTION MANUAL

Heraeus

INSTRUMENTS

Laboratory Air Circulation Ovens

Models UT 6 P, UT 12 P, UT 20 P

Comply with the operating instructions and keep this manual in the vicinity of the unit I

Issue: May, 1994

50 042 750

Heraeus Instruments GmbH

Heraeusstrafie 12 -14

D- 63450 Hanau

DD

National sales

International sales

Technical support

National sales

International sales

Technical support

Spare parts

++ (0 61 81) 3 5 - 3 00

++ (0 61 81) 35- 4 22

++ (0 61 81) 35- 53 05

++(0 61 8 1 ) 3 5 - 5 9 73

+ + (0 61 8 1 ) 3 5 - 7 49

++ (0 61 81) 3 5 - 8 80

++ (0 61 81) 3 5 - 6 67

O Heraeus Instruments GmbH. 63450 Hanau, Germany function line* is a registered trademark of Heraeus Instruments GmbH

The German version of this Instruction manual applies in the event of any deviations in the translation

Nominal charge

This instruction manual applies for the following models:

Order No.

50 042 298

Model

UT6P

Equipment

Air circulation oven, programmed controller, 1/PE AC, 230 V; 50/60 Hz

50 042 300

SO 042 306

50 042 312

UT6P

UT12P

UT20P

Air circulation oven, programmed controller, 1/PE AC, 120 V; 50/60 Hz

Air circulation oven, programmed controller, 1/PE AC, 230 V; 50/60 Hz

Air circulation oven, programmed controller, 1/PE AC, 230 V; 50/60 Hz

These heating cabinets must be operated in accordance with the instruction manual and

may only be used for their intended applications in order to ensure the safety of personnel, the environment and the processed items and materials.

Read the instruction manual carefully before using the equipment and comply with the instructions that it contains to avoid making mistakes and to prevent any personal injury or

damage to property.

2/34 50 042 750

Issue: May, 1994

CONTENTS

1. GENERAL SAFETY INSTRUCTIONS 4 - 6

Explanation of icons 4

General information 5

Operating instructions 5

Field of application 5

Safely instructions 6

2. SETUP AND INSTALLATION 7 - 9

Transport 7

Unpacking the unit 7

Installation 7

Room ventilation 8

Mains connection 8

Noise insulation 8

Connecting to an air extraction system 9

3. UNIT SPECIFICATION 10-17

Overview of the control elements 10

Switchgear unit 10

On / Off switch 10

Overtemperature protection device 10-11

Fresh-air flap control 11

Automatic control unit 12

Signal lamps, status function 12

Basic functions: temperature control, time switch, air speed adjustment 12

Added-feature programming functions, fixed programs 13

Fixed program segments 14

Compilation of a fixed program 14

Example of a fixed program 15

Programmed controller function 16

Termination commands 16

Example of a temperature/time program, definitions 16

What happens If... ? 17

4. OPERATION 18-28

Starting up with

Basic functions - temperature control, time switch, blower speed adjustment 18-19

Added-feature programming functions, example 2 0 - 2 1

Programmed controller functions, example 2 2 - 2 7

Operating guidelines 28

Loading 28

Shutdown 28

5. MAINTENANCE 2 9 - 3 0

Decontamination / disinfection 29

Cleaning 29

Servicing 30

Tests 30

Repairs 30

Approved spare parts / accessories 30

6. TECHNICAL DATA 31-34

Issue: May, 1994 50 042 750 3/34

GENERAL SAFETY INSTRUCTIONS

EXPLANATION OF ICONS

This symbol marks chapters and sections of this instruction manual which are particularly

relevant lo safety.

When attached to the unit, this symbol draws attention to the relevant section of the

instruction manual.

Marks information about optimum utilization of the unit in the instruction manual.

Warns of hot surfaces.

set I

Key for temperature selection, time-switch function and to confirm entered information

prog

Key for the programming function, lime selection and to confirm entered information

Key to set the air speed and to confirm entered information

vent

Value adjustment key, INCREASE VALUE

Value adjustment key, REDUCE VALUE

Information about proper disposal / recycling

Overtemperature protection device

: resh-alr flap control

Continuous adjustment from minimum to maximum values

Quick reference guide to operation o

Select the status of the control unit (enabled / disabled)

Temperature control function, select temperature

(T)

Time-switch function, sel the operating times

Programming function

Blower function

4/34

50 042 750 Issue: May, 1994

GENERAL SAFETY INSTRUCTIONS

General information

The unit fulfils the following safety standards:

DIN EN 61 0 1 0 - 1 / 0 3 . 9 4 . VDE 0411 Part 1 / 0 3 / 9 4 , E D I N V D E 0411 Part 1 1 1 .

DIN 1 2 880 Part 1 / 1 1 . 7 8 and DIN E N 6 0 335 - 1 , V D E 0 7 0 0 Part 1

DIN EN 55 011 Part 3, DIN VDE 0875 Part 11 / 07. '92

"Q ' Always quote the data on the rating plate w h e n requesting information or ordering spare parts

A

Operating instructions

The operator must provide anybody working on or with this equipment with written instructions for any operations to be performed. Such instructions must be easy to understand and must be available in the language of the respective personnel (FRG: UW V B G 1 § 7 (2)).

• Log book

We recommend that a log book is kept, which records any tests and calibration operations performed on the unit and any other work (repairs, modifications etc.).

Field of application

The unit has been designed as an item of laboratory equipment for technical applications.

• Heat treatment of samples or materials with operating temperatures of between room temperature + approx. 20*C a n d 250 ' C , e.g. for drying, ageing, analysis, fusing, burning In, oxidizing, reducing, preheating, etc.

• Hot-air sterilization, sterilization by heating the article up to a temperature of at least 160 'C

(FRG: also refer to DIN 58 947).

Note. Th« ilerillzation temperature usually required in Ihe fleW of medical laboratory work l> 110 *C.

The unit has been designed for installation a n d operation in the following fields:

• Laboratories, e.g. in the commercial or industrial sector, schools, universities, hospitals and biology

The unit is equipped with an independent overtemperature protection device, which means that it does not require constant supervision.

The heating unit has been designed for continuous use.

Make sure that an adequate clearance is maintained between the inside walls of the inner compartment and the loaded articles, and between the various layers of loaded articles, to prevent uneven heating of the materials.

Protective gloves, goggles etc. must be m a d e available to the operator because of the potentially high operating temperatures.

The unit must not be used to dry or heat substances w h i c h may release combustible gases or vapours into the atmosphere, w h i c h could b u m or explode w h e n mixed with air.

The heating unit is equally unsuitable for the heat treatment of combustible dusts or fibrous materials.

Issue: May, 1994 50 042 750 5/34

1 GENERAL SAFETY INSTRUCTIONS

Safety instructions

Comply with the Instructions in this manual and keep it In the vicinity of the unit.

These units must be operated in accordance with the Instruction manual and may only be used for their Intended applications in order to ensure the safety of personnel, the environment and the processed items and materials.

Read the Instruction manual carefully and comply with the instructions that it contains to avoid making mistakes and to prevent any peronal injury or damage to properly.

Unit must be operated by instructed personnel.

Keep unit out of reach of children.

Apart from the Instructions in this manual, the respective national regulations must also be observed for the installation and operation of this unit (FRG: ZH 1/119, DIN 12 880 Part 1)

The applicable national environmental regulations must be observed for the extraction of exhaust gases that are produced during heat treatment. Suitable measures must be Implemented to ensure that such gases are safely led outside (FRG: BlmSchG, U V P G , AbfG, W H G , ChemG, ...).

The unit must not be used to dry or heat substances which may release combustible gases or vapours Into the atmosphere, which could bum or explode when mixed with air. The unit is equally unsuitable for the heat treatment of combustible dusts or fibrous materials.

Check the mains lead and connector for damage before using the unit. If there are any signs of damage, do not connect the unit up to the mains.

The voltage quoted on the rating plate (rated voltage) must agree with the mains supply voltage.

Protective gloves, goggles etc. must be made available to the operator because of the potentially high operating temperatures.

The surfaces around the opening of the Inner compartment become hot at high operating temperatures • RISK OF BURNING - Avoid contact with these surfaces.

Ensure that the overtemperature protection device works properly by conducting a functional check at regular Intervals, every 3 months at least, and check the electrical equipment at least once a year.

Any work to be conducted on the electrical equipment of the unit may only be performed by a qualified electrician. The unit must be disconnected from the mains supply before commencing service or repair work.

Only use approved accessories and approved genuine spare parts. The use of any other parts may result In unforeseen problems and should be avoided under all circumstances.

The serviceability and safety of the unit can only be guaranteed if the necessary tests, maintenance, servicing and repair work Is carried out by the Heraeus service personnel or other agencies who are authorized to act on our behalf.

Heraeus Instruments GmbH cannot accept any liability for any damage that occurs as a result or improper use or repair work, which has not been performed by Heraeus service centers, or if parts other than the approved genuine spare parts / accessories are used.

6/34 50 042 750 Issue: May, 1994

SETUP AND INSTALLATION

Transport

Handle the unit with care. Avoid jarring and protect against damage. Do not lift by the door handle, the door itself, the control unit, the blower box, the spacer or the power lead.

Refer to the TECHNICAL DATA for dimensions and weight.

• Unpacking the unit:

Unpack the unit, remove the transport safety fixtures from the inner compartment and remove any dirt or dust which may have accumulated in transit.

Installation

The unit must be installed in a dry environment.

The relative humidity should be between 60 and ZO % under normal conditions.

Condensation should be avoided. If condensation has formed on the unit following a change of location or during transporalion. for example, wait until the unit has dried out completely before putting into operation.

The ambient air should not contain excessive amounts of dust.

(Comply with the instructions in the MAINTENANCE section).

Do not cover or obstruct the ventilation or exhaust vents in the unit housing, remove any dust or dirt with a vacuum cleaner.

The ambient temperature should not exceed 40 *C.

Place the unit on a firm, fireproof surface (e.g. laboratory table, support frame) in a stable, perfectly upright position.

Keep the unit away from direct sunlight (UV radiation).

If you wish to stack two units on top of one another, use the stacking frame (available as an option). Never stack more than two units on top of one another. When stacking units of different types, make sure that e.g. an Incubator is always at the bottom, and prevent any mutual influence.

Fig. 1/2: Clearances to adjacent surfaces / objects:

: 5cm

30 cm

*m>JI

5 c m >

•

Maintain a distance from the back:

U T 6 P : at least 12 cm

U T 1 2 P : at least 8 cm

U T 2 0 P : at least 8 cm

The wall spacer may only be removed if the unit is connected up to an extraction system.

The exhaust gases must be led through / past adjacent surfaces / objects located above or behind the unit with heat insulation to avoid the danger of fire.

If the unit UT 6 P is to be fitted under a table or into a laboratory fixture, it must be connected to an exhaust air extraction system. The top clearance may only be reduced to min. 5 cm under such circumstances. Ensure adequate ventilation.

Types UT 12 P and UT 20 P are not suitable to be fitted under a table.

Issue: May, 1994

50 042 750

7/34

SETUP AND INSTALLATION

Room ventilation

Adequate ventilation must be provided wherever the unit is installed.

Do not operate the unit In non-ventilated enclosed spaces.

Special ventilation measures (e.g. ventilation of designated work areas, FRG also refer to VDI

1946 Part 7) when several units are Installed in one room.

Mains connection

The laboratory unit is supplied with a permanently connected, flexible mains power lead with connector (grounded).

The connector serves to disconnect the unit from the mains power supply.

Examine the power lead and connector for damage before using the unit. If there are any signs

of damage, do not connect the unit to the mains supply.

The voltage quoted on the rating plate (rated voltage) must agree with the nominal mains

voltage.

The unit may only be connected up to the mains via a properly Installed socket outlet with PE

conductor (protection class I) or a permanent terminal connection.

In the event of a permanent terminal connection, a master switch (lockable In the "Off"

position) must also be installed to disconnect the unit from the mains.

An earth-leakage circuit-breaker should also be fitted in the supply system to provide

additional protection against electric shocks.

Rubber-sheathed flexible cable of at least 2.5 mm

3

diameter (H 07 RN-F ...) should be used for

any extensions that may be required to connect the unit.

Refer to the TECHNICAL DATA section for the rated power consumption, circuit protection with a T 1 6 A fusible link or a 8 16 circuit-breaker.

Noise Insulation

The unit develops a constant noise load.

Refer to the TECHNICAL DATA section for the noise level.

The unit may produce higher noise levels In unfavorable Installation conditions. Supplementary

measures may have to be Implemented to Improve the sound insulation in the room.

8/34 50 042 750 Issue: May, 1994

SETUP AND INSTALLATION

/j\ Connecting to an extraction system

Comply with the applicable national environmental regulations for the extraction of exhaust gases released during the heat treatment. Suitable measures must be implemented to ensure that such gases are safely led outside (FRG: BlmSchG). Such measures may involve thermal or catalytic treatment of flue gases.

Refer to the TECHNICAL DATA section for the volume flow and temperature of the exhaust gases.

Fig. 2/2: Example of an installation

1 Inlet air flow

2 Heating cabinet

3 Adjacent surface / object

4 Exhaust-air blower

5 Exhaust air flow

Draft breaker

Implementation instructions:

• A draft breaker must be used to connect the unit to an extraction system.

• All flue ducts must be made of fireproof materials.

• Apertures must be provided to enable the removal of residue and condensate. The flue ducts must be thermally insulated (recommendation: half-shell sleeves made of laminated mineral Tiber).

• The exhaust air / gases from the unit must never come into contact with combustion exhaust gases.

• Use the draft breaker to adjust the air flow volume in such a way that exhaust gases can be extracted reliably without producing any eddying at the unit's exhaust-gas connector.

• Technical measures should be implemented to monitor the flow of air and flue gases and to prevent operation of the heating unit if the ventilation system Is switched off / defective

(electrical interlock).

Issue: May, 1994

50 042 750

9/34

3. UNIT SPECIFICATION

Fig. 1/3: Overview of the control elements

I 1 c

A Switchgear unit

B Automatic control unit

C Door handle

~

i—.

— B

I 4 -

U LJ

A

Item A: Swltchgear unit

Fig.

2/3: Switchgear unit control panel

1 -

- 2

4 -

1 On / Off switch

2 Overtemperature protection, control element

3 "Fault" signal lamp

4 Fresh-air flap adjustment

• 1 ON / OFF switch:

To switch the unit on and off:

"on" = Unit switched on, the temperature Inside the unit appears on the display panel of the control unit,

"off' = Unit switched off, temperature display off.

• 2 & 3 Overtemperature protection device / signal lamp:

The unit is equipped with an electronic upper-limit cut-out device (TWB) of protection class 2 as defined by DIN 12 880 Part 1. II Is electrically and functionally independent of the temperature control system. In the event of a fault In the unit heating system, the operational TWB shuts down the unit heating across all poles as soon as the temperature exceeds the preset value.

The red signal lamp Indicates activation of the protection function (Fig. 2/3: Item 3).

The unit must be reset manually, by pressing the control element.

* Allow the unit to cool down (by approx. 30 *C), press the control element, the red signal lamp will go out.

The operate value Is adjusted with the help of a tool (coin, screwdriver...).

Adjust (o the required protection level:

• to upper temperature limit» unit protection (protects the unit and its environment).

*• to approx. 10 *C higher than the operating temperature set on the control unit = material protection (protects the unit, Its environment and the loaded material).

Ensure that the overtemperature protection device works properly by conducting a functional check at regular Intervals, every 3 months at least, and check the electrical equipment at least once a year.

10/34 50 042 750

Issue: May, 1994

3. UNIT SPECIFICATION

• 2 & 3 Overtemperature protection device / signal lamp:

Functional test of the TWB

(Prerequisite: required working temperature (control unit) has been reached /remains constant)

Set the TWB to approx. 10 - 20 'C below the temperature displayed on the control unit. The

TWB must respond, the red signal lamp indicates "Fault".

The TWB is working properly. Press the control element to release the TWB.

Now set the TWB to the temperature limit for the required type of protection.

If "Fault" is signalled during operation:

Check the settings of the TWB and the control unit and correct if necessary. If set for "material protection", this may indicate a blower malfunction. If the problem persists, contact the service center.

• 4 Fresh-air flap control

For continuous control of the fresh-air supply to the inner compartment.

•* Set to left-hand stop = minimum fresh-air supply

*• Set to right-hand stop = maximum fresh-air supply

Issue: May, 1994 50 042 750 11/34

3. UNIT SPECIFICATION

Item B: Automatic control unit

The automatic control unit contains the basic functions of a 2-posilion controller with PD/PID control response, time switch to switch the heating and ventilation on / off after the set time, the

added features of permanently programmed heating process programs and the programmed

controller functions of a freely programmable process controller.

Fig. 3/3: Control unit control panel

1

\

\

"C

I

2

*vl

IB

/

/

3 i

/ /

A

5

M

1

2

3

4

5

8

9

6

7

Signal lamp - healing &talus

Signal lamp - control uml status

Display panel

Control key

"Increase displayed value" key

"Reduce displayed value" key

"Programming function" key

"Air speed adjustment" key

Display panel

\ \

The status of the control unit is Indicated by signal lamps in the display panel.

THE YELLOW SIGNAL LAMP (Item 1) indicates the current status of the heating control system:

»• Lamp switched on •

unit heating activated

•• Lamp switched off

: heating off

Rhythmic flashing of this signal lamp indicates that the temperature controller is regulating the operating temperature.

• THE GREEN SIGNAL LAMP (Item 2) indicates the status of the control unit:

> Lamp on » control unit switched on: heating and blower enabled.

The heating and blower are activated when the unit is switched on (On / Off switch).

•• Lamp off » control unit switched off: heating and blower disabled.

The heating and blower are not activated when the unit is switched on

*• Lamp flashes * time-switch function activated.

Basic functions

The control unit is equipped with the "temperature control", "time switch" and "inside air

speed adjustment" basic functions.

The unit can set an operating temperature of up to 250 *C, switching times of between

0:01 and 99:00 hours and and Inside air speed in stages of approx. 40 %, approx. 70 % and

100%.

Refer to STARTING UP WITH BASIC FUNCTIONS for information about the commands for the basic functions.

12/34

50 042 750 Issue: May, 1994

3. UNIT SPECIFICATION

Added-feature programming functions, fixed programs

The control unit is capable of running heating process programs with fixed, preselected parameters from a database.

The program segment and the parameters are stored in the database.

The fixed program contains a maximum of four program segments and a status command.

Fig. 4/3: Example of a temperalure/time process, controlled by the fixed program t

T f C )

P I . 0 - P I . 9 : j P 2 . 0 - P 2 . 9 P 3 . 0 . P 3 . » j.l P 4 . 0 - P 4 . 9 P. OF

P.OFI

P. re

Each program segment, P I - P 4, is assigned to a typical temperature / time response. 10 selectable sets of parameters are permanently stored In the database for each program segment. These sets of parameters can. be assigned within the program.

A status command is provided as the fifth program segment. This determines the subsequent action with the program selected from the fixed program memory:

* Program on standby, do not execute yet = Select" P. o F'

•• Program on standby, wait for program start • Select" P. o n"

•• Delete program from memory completely • Select" P. r E "

The program memory is erased on delivery. If the operator Interrogates the program segments,

"Parameter set off' appears in the display panel = e.g." P. I -".

When compiling a program, selecting "parameter set off" within the selected program segment causes the control unit to bypass this segment for the fixed program function.

The selected program always runs from program segment P I. n to program segment P 4. n.

If program segment P 3. n is combined with program segment P 4. n, the heating and blower are only switched off following termination of segment P 4. n.

If a program is interrupted and started again, the sequence commences at segment P I. n.

The previously selected operating temperature cannot be changed once the program has started.

The heating is switched off in the event of a power failure (> 20 ms) with subsequent restoration of the power supply, the temperature inside the unit Is displayed as a flashing value and the program must be started again.

Issue: May, 1994

50 042 750 13/34

• Fixed program segments:

Program segment" P 1. n " (n = -, 0... 9):

Assigning a parameter (0 ... 9) from the database causes the unit to switch on heating and ventilation on expiry of a preset period.

Selectable parameters In this program segment:

PI-

Off

PL 0

2 h

PI.

I PI.

2 PI.

3 PI.

4 PI.

5

P I . 6 P I . 7 P I . 8 PI. 9

4 h

6 h 8 h

10h 12h 16 h 20 h 24 h 72 h

Program segment" P 2. n " (n «-, 0 ... 9):

Assigning a parameter (0 ... 9) causes the unit to heat up to the preset operating temperature at a specific rate of temperature change per hour.'

1

Selectable parameters In this program segment:

P 2 . off

P 2 . 0 P2.1

P2.

2

P2.3

P2. 4 P2. 5 P 2 . 6

P2. 7

P2. 8 P2. 9

10*C/h 20'C/h 30"C/h 40'C/h 50'C/h 60*C/h 80'C/h 100'C/h 120*C/h 200'C/h

Program segment" P 3. n " (n • -, 0... 9):

Assigning a parameter ( 0 . . . 9) causes the unK to heat up to the preset operating temperature, to maintain this temperature for the preset period and to subsequently switch off heating and ventilation

Selectable parameters In this program segment:

P 3 . off

P3.0

P3.1

P3.2

15 min. 30 mln.

1h

P3.3

1.5 h

P3.4

2 h

P3.5

4 h

P3.8

6 h

P3.7

8 h

P 3 . 8

12 h

P3. 9

24 h

Program segment" P 4. n " (n « - , 0 . * 9 ) : , .

Assigning a parameter ( 0 . . . 9) causes the unit to cool down from the previously reached Inside temperature at a specific rate of temperature Change and to subsequently switch off heating and ventilation.

11

•*: ;

Selectable parameters In this program segment:

P4.-

P 4 . 0 P4.1 P 4 . 2 J»4

!

/3' P 4 . 4 P 4 . 5 P 4.6 P 4.7 P 4 . 8 P 4.9

off 1'C/h 2*C/h 5'C/h 10*C/h 20"C/h 30"C/h 40'C/h 50'C/h 60"C/h 80'C/h

1) KOORDng lo nvxM »nd load

• Compilation of a fixed program

After activating the added-feature function, the sequence is compiled by marking the required program segments.

Example: Fixed program comprising P I. 2; P 2. -; P 3.7; P 4.4 and P. o n :

14/34

50 042 750 Issue: May, 1994

3. UNIT SPECIFICATION

• Example of a fixed program

*• Example E1: Hot-air sterilization process

The heating should switch on in 8 hours, the unit should heat up to an operating temperature of

190 *C (sterilization temperature) at a rate of 200 *C/h, maintain this temperature for 4 hours

(equalization phase and sterilization period) and should subsequently cool down at a rate of 20

•C/h.

The program should start following program selection (status command: P. on).

Fig. 5/3: Program profile - hot-air sterilization process El

190

-

C c

1

S2 S3 S4 ' S1 - S 4«Programmsegment

:

/A

mi P3.5

P.onl

Sequence E 1 :

After sketching the process characteristic, select the segments which correspond to the required sequence from the matrix .

Mark the program segments and the " P. o n" status command. Leave program Input mode.

Select 190 "C as the required operating temperature. Start the fixed program.

While the program is running the display alternates between the temperature inside the cabinet and the current program segment.

Refer to STARTING UP WITH ADDED-FEATURE PROGRAMMING FUNCTIONS for further information.

Issue: May, 1994

50 042 750

15/34

OPERATION

Programmed controller function

The programmed controller function enables the arbitrary definition of temperature / time processes.

You may select up to 9 program segments. Operating temperature, period and air speed level can be selected for each segment.

Termination commands

A termination command can be selected as the last program segment. The termination command determines the function to be performed by the unit after running through the program

There are three optional termination commands:

•• " hold " = Once the program has terminated, the operating temperature set for the last program segment is malntaned until a new operating temperature has been selected.

* •• stOP " = Once the program has terminated, Ihe heating and blower are switched off until the "stop" command Is cancelled.

>• •• CYCL " - Once the program has terminated, It returns to the beginning and is repeated continuously until the "CYCL" command is cancelled.

A termination command must always be entered at the end of every program.

Fig. 6/3: Example of a temperature / time / ventilation program with "CYCL" termination command

40

%

T1

\

7

100%

\

T7 T8

r

1

M

\

.

i

\

S

T3 T4

4

• »

T5

V

/ n 8

\

V

>

\

T9

11 t2 t3 14 t5 re t7 t8 t9 t

16/34 n 10«CYCL

• Definitions n 1 ... n9 n10

T 1 ... T 9

11 ... t 9

Program segments

Termination commands (hold, StOP or CYCL)

Specified operating temperature (SO - 250 *C)

Specified time - program segment (0:01 - 99:0 h)

U 1 ... U 3 Specified ventilation level (approx. 40 %. approx 70 % and 100 %)

• Refer to STARTING UP WITH PROGRAMMED CONTROLLER FUNCTIONS for details.

50 042 750 Issue: May, 1994

OPERATION

What happens if ... ?

Possible display

8 8 8

O F F

One digit in the display flashes

P1.3

P 1.3 alternating with inside temperature

P. o n

P. OF

P. r E

P r o alternating with inside temperature n I hold

stop

CYCL

E - 3

E - 4

E-S

E - 6

E - 7

E - 8

E - 9

Explanation

Control unit test phase

Status of the control unit, heating and ventilation disabled

The flashing value can be changed

Program segment when entering an added-feature program function

Program segment while the added-feature program is in progress

Status command for an added-feature program:

Program on standby, wait for program start

Status command for an added-feature program:

Program on standby, do not execute yet

Status command for an added-feature program:

Delete program from memory completely

Entered program on standby

Power failure (> 20 ms) with subsequent restoration: the heating switches off, "P r o" alternates with the temperature inside the unit on the display, if a program is in progress It is Interrupted and must be started again.

Program segment when entering and activating the programmed controller function.

Termination command when entering the programmed controller function: the temperature set for the last program segment is maintained on termination of the program

Termination command when entering the programmed controller unction: the heating and ventilation is switched off on termination of he program

Termination command when entering the programmed controller function: when the program is terminated, it retums to the beginning and starts again

A termination command is entered for this program segment when entering the programmed controller function. The termination command must be changed to a time value to enable the input of a emperature value.

Stored data defective

Switch the unit off and on again. If the problem persists, contact the service center

Error of measurement in the reference values contact (he service center -

Upper-limit violation of actual temperature tolerance contact the service center -

.ower-limit violation of actual temperature tolerance contact the service center -

Temperature sensor or input defective contact the service center -

Stored data defective contact the service center -

Erroneous reference values contact the service center -

Issue: May, 1994

50 042 750 17/34

OPERATION

Afler letup and Installation, proceed as follows to start up:

Starting up with basic functions, without programming

Instruction

Switch unit on

Key(s)

On / Off switch = "on"

Example ol display Remarks

The green status display indicates the status.

Display panel: inside temperature

The unit runs through a self-test phase after switching on, display: " 888 ".

If the " o f f ' status was selected for the previous operating phase, the display alternates between the lemperature Inside the cabinet and the "oFF" status.

Selecting the control unit status function

Control unit "on":

(heating and ventilation enabled)

1 . 1 l i

Inside temperature, green signal lamp lights up continuously

Select this status function to operate the unit, or to use the time-switch function to switch the heating and ventilation off after a preset period ontrol unit "off":

(heating and ventilation disabled)

I approx. 3 sec.

II I I

: D

Inside temperature, green signal lamp remains dark

Select this status function to switch the heating and ventilation off, or

If the heating and ventilation Is to remain off during programming, or to use the time-switch function to switch the heating and ventilation on after a preset period

Salting the operating temperature

Display the preset operating temperature

Preset operating temperature

Increase the preset operating temperature

Display flashes

Value increases

'I I

Reduce the preset operating temperature

Display flashes

Value decreases

Store new preset iperatlng temperature

II I I

I ""II I

Display flashes

New operating temperature is stored, then Inside temperature appears on display

Unit regulates the operating temperature when status " o n " , yellow signal lamp indicates the status of

Ihe heating control system.

Adjusting the overtemperature protection device: refer to Chapter 3 ettlng the position of the fresh-air flap

18/34

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Issue: May, 1994

OPERATION

Setting the switching time

Instruction

Select time-switch function, display time remaining for timing period

Increase preset time

Key(s)

Example of display

I I II I

I.I

II I

Remarks

Display flashes, lime-swilch funcition is displayed. If liming period in progress, displays time remaining

Reduce preset time

l I II

.l I l

Value can be adjusted between 1 minule and 99 hours Adjustable in full hours from 10.0 hour selling

The heating is switched on or off. according to sel status.

once timing period has expired

Store new preset time value set

I I

.II

The lime value is transferred to the memory, the inside temperature then appears on the display

The flashing status display Indicates that the time-switch function has been activated.

If you do not wish to use the time-switch function, enter 0.0 0 as the preset time.

Selecting the air speed level

Display the preset air speed level

•"I

1 1

1 1

' - ' 1 Preset air speed level

Increase preset air speed level

r

i n

1

1 1 '—

-

1

• - • 1

Display flashes, speed symbol

Value increases

(e.g. 7 0 % / 1 0 0 %)

I

IUU|

Reduce preset air speed level

l t ~ ^ —** ~ ^ i

Display flashes, speed symbol

Value decreases

(e.g. 70 % / 40 %)

Store new preset air speed level

Display flashes, speed symbol

Air speed level is stored and the display then goes dark

Issue: May, 1994 50 042 750

19/34

4 OPERATION

Fig. 1/4: Example of a hot-air sterilization process

S 1 - S 4 • Programmsegment

190 *C

P 3 . 5 P.onl

The heating is to switch on in 8 hours, the unit should heat up to 190 'C at 200 'C/h, maintain this temperature for 4 hours, then switch off.

The program should start following program selection (P. o n).

Starting up with added-feature programming functions

Instruction

|Key(s).

| Example of display | Remarks

Switch unit on, select operating temperature: refer to start-up with basic functions

Adjusting the overtemperature protection device: refer to Chapter 3

Control unit "oir, unit should not heat up during this input

- = = — I approx. 3

> / sec.

II

U I

Status display = "off", control unit is disabled, Inside temperature Is displayed

Call fixed program memory

— — I approx. 6 set sec.

Display flashes, program segment S1 appears after 6

Select parameter PI. 3

Mark P I. 3 as the required parameter in program segment S1

Select program segmenl S2

set

I I I

U I _J

I L I

I I I

_

I. I

Programmable digit flashes.

P I. Is displayed if no parameter has been marked

Programmable digit flashes

P I. 3 is transferred lo the memory, programmable digit flashes

Programmable digit flashes

Continue In the same manner to enter / mark program segments P 2. 9, P 3. 5 und P 4.

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Issue: May, 1994

OPERATION

Entering the status command

Instruction Key(s)

Select and mark status command P. o n

Example of display

1

Remarks

P. o n is displayed, mark with the "set" key

Leave the program memory

U

Display alternates between inside temperature and

" P r o "

Input terminated

Starting the added-feature program

Start the program approx. 3 sec.

I . - I

Program is started, the display alternates between the temperature and the program segment

Terminating the added-feature program

Terminate the program f — = = — | approx. 3

| v 1 sec.

a

l_l

1 1 l_l

Display alternates between the inside temperature and

" P r o "

Issue: May, 1994 50 042 750

21/34

UKtKMIION

Fig. 2/4: Example of the programmed controller function with " StOP " termination command

40% 100%

T7 \ T8

/

vV I

T9 t2 13

t5 t6 t7

t8 t9 t n 10 = StOP

The program sequence from a total of 9 segments must be entered, after which the healing and ventilation is to be switched off.

The air speed levels to be set for each program segment are given in percent.

Starting up with programmed controller (unctions instruction

Key(s)

|Example of display Remarks

Switch the unit on, refer to start-up with basic functions

Adjusting the overtemperature protection device: refer to Chapter 3 ontrol unit "off, unit should not heal up during this input

ca. 3 Sek.

n n I

J U.U

Inside temperature, green signal lamp lights up continuously all main program memory set

I I

Program segment

"n I" is displayed, programmable digit flashes

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Issue: May, 1994

OPERATION

Entering the temperature for a program segment

Instruction

Enter operating temperature T 1,

230 *C

Key (s) Example of display Remarks

Preset operating temperature for program segment

1(n I) Mashes in display

If" —" appears In the display when the set key is pressed, then "hold" or "StOP" has been enlered as the termination command for program segment n I. If you wish to enter a temperature value, you must first change the termination command to a time value (refer to Ihe section on "Changing the time for a program segment").

Enter 230 "C

I

II I

"II I

Transfer temperature

T1=230 *C to the memory

I I

Program segment

" n I" is displayed, programmable digit flashes

Entering the time for a program segment

Enter the time for program segment n I,

2:00 h

Transfer the preset time for program segment n I to the memory

The time for n I flashes in the display

I I

Timet 1= 2 . 00

I I

I I I

n I is displayed, programmable digit flashes

Issue: May, 1994 50 042 750

23/34

OPERATION

Entering the air speed level for a program segment

nstruclion

Key(s)

Example of display

Select Ihe preset air speed level lor program segment n I

I I

Remarks

Air speed level flashes in the display, speed symbol

ransferthe preset air speed level lor program segment n I to the memory

I I

I I

Select air speed level,

approx. 40 % in this

case

n I is displayed, programmable digit flashes

Selecting the next program segment

Select program segment n 2

n 2 Is displayed, programmable digit flashes

Enter the preset operating temperatures, time values and air speed levels for program

segments n 2 - n 9 in the same manner as for program segment n 1 and select program

segment n 10.

Selecting the termination command

Select the "StOP" termination command

_ I I I

I I I I I

Termination command flashes in the display

II I

II I

Enter the "StOP"

termination command

Transfer the termination command to the memory prog

II I

n I n 10 is displayed, programmable digit flashes

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Issue: May, 1994

OPERATION

Leaving the program memory

Input terminated

Starting the program

Instruction

Start the program

Key (s)

| approx. 6 sec.

Example of display

II I I I

Remarks

Inside temperature and program segment are displayed

Terminating the program

Instruction Key(s)

Terminate the program I I approx. 6 sec.

1 prog 1

Example of display

D

- r n

1 1

Remarks

Inside temperature and control unit status are displayed

Issue: May. 1994 50 042 750

25/34

OPERATION

Fig. 3/4: Example of the programmed controller function with " hold " termination command

T1

100%

T2

/

•4

/

/

40%

n 1

\

•4

70% n 3

11 12

T3

nA 'hold

Starting up with programmed controller function

The "hold" termination command has been selected here as an alternative to example 2/4.

Enter the preset temperature, time and air speed level values for the program segments according to the same procedure as example 2/4.

Instruction Key(s) Example of display

Select program

segment n 4

I I

Remarks

n 4 is displayed, programmable digit flashes

Select the "hold" termination command prog

I i

"I " I

Termination command

flashes in the display

I I

Enter the "hold" termination command

Transfer Ihe termination command lo the memory

Leave the program memory and slart the program n 4 is displayed, programmable digit

flashes

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Issue: May. 1994

4 OPERATION

Fig. 3/4: Example of the programmed controller function with " CYCL " lerminalion command

4 0 %

T1 T2

100%

70%

\

T3 T4

40 % ^

4

n 1

» < "

2

• t1 12 13 14 n 5 • CYCL

Starting up with the programmed controller function

The "CYCL" termination command has been selected here as an alternative to example 274.

Enter the preset temperature, time and air speed level values for the program segments

according to the same procedure as example 2/4.

Instruction

Select program segment n 5

Key(s) Example of display

i i

Remarks n 5 is displayed, programmable digit flashes

Select the "CYCL" termination command prog

Termination command flashes in the display

Enter the "CYCL" termination command

Transfer the termination command to the memory prog

Leave the program memory and start the program

I I I

n 5 is displayed, programmable digit flashes

Issue: May, 1994

50 042 750 27/34

UfCKAIlUN

Operating guidelines

Remember to put on protective garments, e.g. gloves, goggles, mask, body protection, remove any items of jewellery before starting work.

Do not cover or obstruct the ventilation or exhaust vents in the unit housing. Always keep these vents free of dust and dirt

• Loading:

Circulating air conducts the heat to the samples in the unit. Make sure that the samples are evenly distributed on the trays, and that they are arranged in such a way as to ensure an unimpeded (low of warm air throughout the cabinet, in order to prevent local overheating. Do not position the samples too close to the inner walls.

Fig. 4/4: Loading diagram

:i a

"a" = approx. 1/10 of the internal dimensions

Be careful not to damage the temperature sensors in the inner chamber when loading.

I- Ji Never place samples on the floor of the chamberl

Keep the inner surfaces of the chamber free of dust and dirt. Never use aggressive chemicals which could damage the stainless steel finish.

Continually heating and cooling the unit over wide temperature ranges can detrimentally affect its service life If used more frequently, it is better to keep the unit running in continuous mode at moderate temperatures.

A If not used for an extended period, disconnect the unit from the power supply.

Shutdown

• Remove the samples from the chamber

• Allow the heating unit to cool down to room temperature

• Switch the unit off and disconnect from the mains

• Clean the inside surfaces of the chamber

(also refer to the section on DECONTAMINATION, CLEANING ...)

28/34

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Issue: May. 1994

OPERATION

The serviceability and safety of the heating unit can only be guaranteed if the necessary

tests, maintenance, servicing, and repair work is carried out by the Heraeus service

personnel or other agencies who are authorized to act on behalf of Heraeus Instruments

GmbH.

Heraeus Instruments GmbH cannot accept any liability for any damage that occurs as a result of improper use or repair work, which has not been performed by Heraeus service

centers, or if parts other than the approved genuine spare parts / accessories are used.

We recommend that you enter into a service contract with our company Please conlacl us (or a quotation.

Decontamination / disinfection

The operator Is responsible for implementing suitable, effective measures to

decontaminate the unit if it is used In connection with hazardous materials. Such

measures must be conducted on a regular basis under normal operating conditions and

in particular if such materials have been spilt or before commencing service work.

The stainless steel components inside the unit may be decontaminated by wiping out with a

disinfectant solution In cases of biological contamination

Recommended disinfectant: Barrycidal 36, available from: Interchem AG. CH-6340 Baar

(FRG sales: Handelsvertretung Helmut Schroder, GaufistraBe 30/2, 70193 Stuttgart).

The applicable national regulations must be observed with respect to disinfection (FRG:

ZH 1/598 ...)

Once removed, the internal stainless steel components may also be subjected to steam

sterilization or autoclave treatment.

Cleaning

Use a mild soap solution (water and mild detergent) and a soft lint-free cloth lo wipe the outer

surfaces and control elements of the unit.

Remove any dust deposits from the air vents with a vacuum cleaner

Remove any dust or dirt from the inner chamber. Use stainless steel cleaning agents in

moderate quantities. Never use acids, chloric solvents or salt solutions to clean the stainless

steel surfaces inside the unit.

Avoid scouring and scratching, or damage to labels and paintwork will be unavoidable.

Include flue/exhaust ducts In the cleaning operations if the unit is connected up to an extraction

system.

Consult the manufacturer before implementing any other cleaning or disinfection

measures than those mentioned in this manual to ensure that the intended methods will not damage the unit.

Issue: May, 1994 50 042 750 29/34

MAINTENANCE

Servicing

The heating unil is virtually maintenance-free

Lubricate the bearing s of the door and door-handle mechanisms with a little synthetic oil from time to time.

Mineral oil products must not be used where they may come into contact with plastic components, as they could cause damage to such parts.

Tests

The following items should be tested at least once a year to ensure that the unit remains in good working order:

• Mechanical (unctions

• Operation in accordance with the specified technical data

• Electrical system (FRG: UVV VBG 4, OIN VOE 0701 Part 1, E DIN VOE 0702 /11.93)

• Safety devices

Repairs

Only approved genuine spare parts and accessories may be used.

The use of other parts may result in unforeseen problems and should be avoided under all circumstances.

Approved spare parts /accessories

Spare part /accessory

Size / model

Instruction manual

Circuit diagram 1/PE AC, 230 V

Circuit diagram 1/PE AC, 120 V

Wire tray with supporting straps

Seasoned silicone rubber door seal

Stacking frame

Space for back panel

Foot

Clasp for the door latching mechanism

Heraeus order number

U T 6 P

SO 040 640

SO 042 916

U T 1 2 P

SO 043 079

SO 041 987

-

50 042 917

U T 2 0 P

-

50 042 918

SO 042 499

50 042 906

SO 042 484

50 042 907

50 028 137

50 042 541

SO 042 284

SO 042 351

50 042 908

Other spare parts and accessories to order

30/34

50 042 750

Issue: May, 1994

TECHNICAL DATA

DATA 1 Model U T 6 P U T 1 2 P

U T 2 0 P

$Wffl^^&$mSS^S.^ *• - ' • • : ••.;•

Dimensions

(W x H x D)

Housing

Chamber

552 x 700 X 685

408 X 459 x 334

696 x 850 x 685

5 5 2 x 6 1 0 x 3 3 4

7 5 4 x 9 1 0 x 8 6 5

6 1 0 x 6 7 2 x 5 1 4

Useful space '• 326 X 367 x 275 441 x 4 8 8 x 2 6 7

4 8 8 x 5 3 7 x 4 1 1

Minimum clearances to adjacent surfaces / objects

Volumes

Left

Right

Top

Rear

Chamber

(empty)

Useful space ''

Steam space

Unit

33 approx. 73 approx. 40

50

SO

300 (SO when connected to an extraction system)

120

64.4

80

112

80

210

57.6

approx. 131 approx. 55

107.8

approx. 234 approx. 75 Weights

Trays

Max. tray load Lumped 15

20

15

20

10

Number

Dimensions

Surface

Total

Standard / Max.

( W x D ) :

50

2 / 9

362 x 333

50

2 / 1 4

506 x 323

15

70

2 / 1 6

564 x 503

Unit mm mm mm mm mm mm mm liter liter liter kg kg kg kg piece mm

Operating temperatures Room temperature + 20 to 250 |'C

Temperature deviations, circulating mode, air flap closed

Spatial" at 70 *C + 0.6

at 150 "C

± 1 8

+ 0.7

+ 1.9

+ 1.5

+ 2.8

K

K

Temporal '> at 250 *C + 0.7

Temperature deviations, fresh-air mode, air flap open

Operating temperature at 250 *C at 70 *C at150*C

70 *C

150 "C

250 *C

+ 3.4

+ 0.2

+ 0.4

8

19

42

+ 3.5

+ 0.2

±0.3

+ 0.8

+ 6.0

+ O.1

+ 0 7

+ 0.8

K

K

K

K

Spatial"

Temporal '• at 70 *C at150*C at 250 *C at 70 *C at 150 'C at 250 'C

+ 1.3

+ 3.5

+ 5.3

+ 0.2

+ 0.4

+ 1.0

• 0.7

+ 2.1

+ 3.5

+ 0.2

+ 0.4

+ 0.8

± 1 - 7

• 3.1

+ 5 6

+ 0.2

+ 0.5

+ 1.5

|K_

K

K

K

K

K

Warm-up times, circulating mode (unit empty, air flap closed, to 98 % of the operating temperature)

8

12

50

9

20

60 min min min

1) in accordance with DIN 12 880 Part 2 / 1 1 . 7 8

Issue: May, 1994

50 042 750

31/34

TECHNICAL DATA

DATA

Model U T 6 P UT12P U T 2 0 P

THERMAL

Warm-up-timos, (resh-air mode (unit empty, air (lap open, to 98 % of the operating temperature)

Unit

Operating temperature

70 'C

150

#

C

10

25

10

20

250'C 55

50

Cool-down times, circulating mode (unit empty, air flap closed, to 50 *C)

10

25

55 min min min

Operating temperature

Recovery times

Operating temperature

250 *C

150'C

70'C unit empty, door open 60 s, to 98 % of the operating temperature)

70

-

C 2 1

150 'C 5 4

250 "C

120

90

32

9

150

120

40

8

1

4

8

180

140

50 min min min min min min

Heat radiation to surrounding areas (at a room temperature of 25 "C)

Operating temperature

70 "C

150 *C approx. 0.16

approx. 0.43

approx. 0.18

approx. 0.42

250

#

C approx. 0.7

approx. 0.6

VENTILATION •-• ;:.

; ysjMfe-s ; , , ; , - : : • v;;#li||V:!f<j,':,

: f

;

¥;

Air volume flow inside the chamber

2.7

4.7

Circulating mode at 25 'C

Fresh-air mode at 250 *C

Rate of air replacment

Fresh-air mode at 250 'C

Exhaust air volume flow

3.7

50

5.1

40

Fresh-air mode at 250 'C

Speed of exhaust air

Air outlet 0 / air inlet 0

Flue gas temperature at duel at 250 *C

6.5

1,44

40

250

10.1

2,23

40

250 approx. 0.2

approx. 0.5

approx. 0.6

4.8

5.1

20

10.1

2,23

40

250 kW kW kW m h ' m"/h m/s mm

•c s

/min m'/h

NOISE [In accordance with DIN 45 635] ;

;

^ : ;

Sound level [20 uPa) 47

Sound power level (1 pW] 60

54

68

. . • • • - v-^sv*;;*!-;;. •

54

68 dB(A) dB

32/34

50 042 750 Issue: May, 1994

TECHNICAL DATA

DATA

ELECTRICAL (rated values)

Rated voltage

Model

Rated frequency

Power consumption

Connected load

Current input

Protection class

Protective measure

Degree of protection

U T 6 P

1.27

1.4

5.5

U T 1 2 P

1/PEAC. 230

5 0 / 6 0

2.32

2 5

10.1

I

UT20P [Unit

2 32

2 5

10.1

PE terminal

IP 20 |

V

Hz

KW kVA

A

Circuit protection to be provided at the installation location "

T 1$ A fusible link (slow-blow) or B 16 circuit-breaker

Connection via an earth-leakage circuit-breaker (Iripping current

< 30 mA) is recommended.

£llCJ|((CAl<(ra(0<) values) - > • ,

Rated voltage

Rated frequency

Power consumption

Connected load

Current Input

Protection class

Protective measure

Degree of protection

Circuit protection to be provided at the installation location "

<

;

' . \

1/PEAC, 120

5 0 / 6 0

1.27

1.4

10.6

I -

-

-

-

-

-

V

Hz kW kVA

A

PE terminal

IP 20

-

-

-

T16 A fusible link (slow-blow) or B 16 circuit-breaker

Connection via an earth-leakage circuit-breaker (tripping current

< 30 mA) is recommended.

5) The applicable national electrical engineering regulations and technical requirements must be observed when connecting up to mains power supply circuits

Issue: May. 1994

50 042 750 33/34

TECHNICAL DATA

©

Component

Outer casing

Heat sink (rear panel)

Inner chamber

Components litted in the chamber

Trays

Door seal

Door bearing

Door handle

Control unit

Switchgear unit

Operator control membrane

Feet

Thermal insulation

Filling medium - overtemp. protection device

Leads

Electronic / electrical components

Heating element

Materials used

Galvanized sheet steel, painted RAL 9002

Aluminium

Stainless steel, material No. 1.4301

Stainless steel, material No. 1.4301

Chromium-plated steel wire

Seasoned silicone rubber

PA, glass fiber reinforced

PA, glass liber reinforced

ABS

PC, glass fiber reinforced

PVS, printed polyester foil

PPN

Mineral fiber wool

Polydimethyldisiloxane

PVC -sheathed copper wire

Encapsulated components coated with various plastics, some mounted on glass fiber reinforced

PCBs with epoxy resin

Stainless steel tubing filled with magnesium oxide and heating conductors

Fibrous materials used for insulation sre ctassiried is health hazards in somt countrias. AHhough the fibers which may be reteased into the environment during normat operation do not constitute a serious risk, greater, more hazardous quantities may be released as a result of Improper handling during repair work or as a result ol mechanical damage.

34/34

50 042 750

Issue: May. 1994