Thermo Scientific OGH 100, OGH 180-S, OGH 180, OGH 60-S, OMH 60 Operating Instructions Manual

©

2012 Thermo Fisher Scientific Inc. All rights reserved.

These operating instructions are protected by copyright. Rights resulting thereof, particularly reprint,
photomechanical or digital postprocessing or reproduction, even in part, are only allowed with the written
consent of Thermo Electron LED GmbH.
This regulation does not apply to reproductions for in-plant use.
The contents of this operating instructions manual may change at any time and without any prior notice. In
case of conflicting translations into foreign languages the German-language version of these operating
instructions shall be binding.

Trademarks

Heratherm™ is a registered trademark of Thermo Scientific.
Thermo Scientific is a brand owned by Thermo Fisher Scientific, Inc.

All other trademarks mentioned in the operating instructions are the exclusive property of the respective man­ufacturers.

Thermo Fisher Scientific
Robert-Bosch-Straße 1
D - 63505 Langenselbold
Germany

Thermo Electron LED GmbH is an affiliate to:
Thermo Fisher Scientific Inc.
81 Wyman Street
Waltham, MA 02454
USA

Thermo Fisher Scientific Inc. provides this document to its customers with a product purchase to use in the
product operation. This document is copyright protected and any reproduction of the whole or any part of this
document is strictly prohibited, except with the written authorization of Thermo Fisher Scientific Inc.

The contents of this document are subject to change without notice. All technical information in this
document is for reference purposes only. System configurations and specifications in this document supersede
all previous information received by the purchaser.

Thermo Fisher Scientific Inc. makes no representations that this document is complete, accurate or error­free and assumes no responsibility and will not be liable for any errors, omissions, damage or loss that might
result from any use of this document, even if the information in the document is followed properly.

This document is not part of any sales contract between Thermo Fisher Scientific Inc. and a purchaser. This
document shall in no way govern or modify any Terms and Conditions of Sale, which Terms and Conditions of
Sale shall govern all conflicting information between the two documents.

C

Contents

Chapter 1 Safety Notes ..................................................................................................................... 1-1

Basic Operating Precautions ............................................................................................................... 1-1

Operational Safety Rules .................................................................................................................... 1-2

Warranty ............................................................................................................................................ 1-2

Explanation of Safety Information and Symbols ................................................................................. 1-3

Safety Notes and Symbols Used Throughout These Operating Instructions ................................... 1-3

Additional Symbols for Safety Information..................................................................................... 1-4

Symbols on the Oven ..................................................................................................................... 1-5

Intended Purpose of the Oven............................................................................................................ 1-5

Correct Use .................................................................................................................................... 1-5

Incorrect Use .................................................................................................................................. 1-5

Standards and Directives .................................................................................................................... 1-6

Chapter 2 Delivery of the Oven ........................................................................................................ 2-1

Packaging ........................................................................................................................................... 2-1

Acceptance Inspection ........................................................................................................................ 2-1

Scope of Supply .................................................................................................................................. 2-2

Chapter 3 Installation........................................................................................................................ 3-1

Ambient Conditions ........................................................................................................................... 3-1

Location Requirements ................................................................................................................... 3-1

Use with Air Exhaust Systems......................................................................................................... 3-1

Intermediate Storage........................................................................................................................... 3-3

Room Ventilation............................................................................................................................... 3-3

Use with Air Exhaust Systems............................................................................................................. 3-3

Space Requirement ............................................................................................................................. 3-4

Installation Built-in Units............................................................................................................... 3-4

Table-top ovens .............................................................................................................................. 3-5

Floor Stand Ovens .......................................................................................................................... 3-6

Transport ........................................................................................................................................... 3-8

Table-top ovens .............................................................................................................................. 3-8

Stacking Kit...................................................................................................................................... 3-10

Installing the Stacking Feet............................................................................................................... 3-10

Installing the Stacking Adapter ......................................................................................................... 3-11

Installing the Anti-tilt Anchor .......................................................................................................... 3-12

Table-top ovens ............................................................................................................................ 3-12

Floor stand ovens.......................................................................................................................... 3-13

Floor stand oven spacers ................................................................................................................... 3-14

Chapter 4 Product Description ........................................................................................................ 4-1

Heratherm OGH Series Oven Overview ............................................................................................ 4-1

Thermo Scientific Heratherm i

Contents

Heratherm OGH-S Series Oven Overview ......................................................................................... 4-3

Heratherm OMH Series Oven Overview............................................................................................ 4-5

Heratherm OMH-S Series Oven Overview ...................................................................................... 4-12

Safety Devices................................................................................................................................... 4-15

Operating Environment ................................................................................................................... 4-15

Door Switch ..................................................................................................................................... 4-15

Sensing and Control System ............................................................................................................. 4-16

Data Communications & Alarm Interface ........................................................................................ 4-17

Alarm Contact .............................................................................................................................. 4-18

AC Power Socket.......................................................................................................................... 4-18

Fuses............................................................................................................................................. 4-18

Work Space Components ................................................................................................................. 4-18

Inner Chamber ............................................................................................................................. 4-18

Product Options of Table-top Ovens ............................................................................................... 4-20

Door Fitted with Viewing Windows and Workspace Lighting ......................................................... 4-20

Tube Access Ports of Table-top ovens............................................................................................... 4-21

Chapter 5 Start-up ............................................................................................................................. 5-1

Table-top ovens .................................................................................................................................. 5-1

Installing the Shelf System .................................................................................................................. 5-1

Initial installation ............................................................................................................................... 5-1

Installing the Shelving ........................................................................................................................ 5-2

Preparing the Work Space .................................................................................................................. 5-3

Table-top ovens .............................................................................................................................. 5-3

Installation or Removal of the Support Rails (OMH Series and OMH-S Series only)..................... 5-3

Installing and Uninstalling the Rear Air Baffle (OMH Series and OMH-S Series only).................. 5-4

Installing and Uninstalling the Lateral Air Baffles (OGH Series and OGH-S Series only) .............. 5-5

Levelling the Oven ......................................................................................................................... 5-6

Commissioning of floor stand ovens ................................................................................................... 5-7

Installing/Removing air baffles (OMH Series) ................................................................................ 5-7

Commissioning, general ..................................................................................................................... 5-8

Installing the Shelf Support Brackets .............................................................................................. 5-8

Installing the Wire-mesh Shelves .................................................................................................... 5-9

Connecting Power .............................................................................................................................. 5-9

Connection to the Power Supply Source....................................................................................... 5-10

Connecting the RS-232 Interface ..................................................................................................... 5-11

Interconnecting the Oven with a Computer ................................................................................. 5-12

Wiring the Alarm Contact................................................................................................................ 5-14

Functional Description ................................................................................................................. 5-14

Alarm Relay Specifications............................................................................................................ 5-14

Connection Example .................................................................................................................... 5-15

Chapter 6 Operation.......................................................................................................................... 6-1

Preparing the Oven ............................................................................................................................ 6-1

Starting Operation.............................................................................................................................. 6-1

Chapter 7 Handling and Control ...................................................................................................... 7-1

Powering Up ...................................................................................................................................... 7-6

Switching the Oven Off / Powering Down ......................................................................................... 7-6

ii Heratherm Thermo Scientific

Contents

Temperature Set Value ........................................................................................................................7-7

Timer..................................................................................................................................................7-9

Setting a Fixed-time On or Off Timer...........................................................................................7-11

Setting a Weekly Timer.................................................................................................................7-12

Stopping a Timer ..........................................................................................................................7-14

Boost.................................................................................................................................................7-16

Fan....................................................................................................................................................7-18

Table-top ovens.................................................................................................................................7-18

Floor stand ovens ..............................................................................................................................7-20

Damper.............................................................................................................................................7-22

Settings .............................................................................................................................................7-24

Error Log ......................................................................................................................................7-24

Calibration ....................................................................................................................................7-25

Date and Time ..............................................................................................................................7-29

Temperature Display Unit ............................................................................................................7-32

Process Protection .........................................................................................................................7-33

Program Preferences ......................................................................................................................7-34

Configuration................................................................................................................................7-36

Programming ....................................................................................................................................7-38

End of Program.............................................................................................................................7-38

ECO Convenience Program (only for table-top ovens)..................................................................7-38

Preparing the Oven for the Eco Convenience Program..................................................................7-39

Instructions ...................................................................................................................................7-40

Chapter 8 Shut-down .........................................................................................................................8-1

Shutting the Oven Down ....................................................................................................................8-1

Chapter 9 Cleaning and Disinfection ...............................................................................................9-1

Cleaning..............................................................................................................................................9-1

Cleaning exterior surfaces ................................................................................................................9-1

Wipe / Spray Disinfection...................................................................................................................9-1

Preparing the manual wipe/spray disinfection..................................................................................9-2

Predisinfection ................................................................................................................................9-3

Chapter 10 Maintenance....................................................................................................................10-1

Inspections and checks ......................................................................................................................10-1

Service Intervals.................................................................................................................................10-2

Preparing Temperature Calibration...................................................................................................10-2

Comparison Measurement Procedure................................................................................................10-3

Temperature Calibration Procedure ..................................................................................................10-3

Replacing the Door Seal ....................................................................................................................10-3

Replacing the Power Cord.................................................................................................................10-4

Returns for Repair .............................................................................................................................10-4

Chapter 11 Disposal...........................................................................................................................11-1

Overview of Materials Used ..............................................................................................................11-1

Thermo Scientific Heratherm iii

Contents

Chapter 12 Error Codes .................................................................................................................... 12-1

Chapter 13 Technical Data ............................................................................................................... 13-1

Chapter 14 Spare Parts and Accessories ....................................................................................... 14-1

Chapter 15 Device Log...................................................................................................................... 15-1

Chapter 16 Contact ........................................................................................................................... 16-1

iv Heratherm Thermo Scientific

L

List of Figures

Figure 3-1 Table-top ovens, dimensions and required clearances ........................................................................... 3-5

Figure 3-2 Floor stand ovens, dimensions and required clearances ......................................................................... 3-6

Figure 3-3 Floor stand ovens, dimensions and required clearances ......................................................................... 3-7

Figure 3-4 Lift Points............................................................................................................................................. 3-8

Figure 4-1 Heratherm OGH 60/ OGH 100/ OGH 180 Series Front View........................................................... 4-2

Figure 4-2 Heratherm OGH 60/ OGH 100/ OGH 180 Series Rear View ............................................................ 4-3

Figure 4-3 Heratherm OGH-S Front View............................................................................................................ 4-4

Figure 4-4 Heratherm OGH-S Rear View ............................................................................................................. 4-5

Figure 4-5 Heratherm OMH 60/ OMH 100/ OMH 180 Series Front View......................................................... 4-6

Figure 4-6 Heratherm OMH 60/ OMH 100/ OMH 180 Series Rear View .......................................................... 4-7

Figure 4-7 Heratherm OMH 400 Series Front View ............................................................................................. 4-8

Figure 4-8 Heratherm OMH 400 Series Rear View ............................................................................................... 4-9

Figure 4-9 Heratherm OMH 750 Series Front View ............................................................................................. 4-10

Figure 4-10 Heratherm OMH 750 Series Rear View ............................................................................................. 4-11

Figure 4-11 Heratherm OMH-S Front View ......................................................................................................... 4-13

Figure 4-12 Heratherm OMH-S Rear View........................................................................................................... 4-14

Figure 4-13 Sensor Mounting Location - OGH Series - Table-top ovens............................................................... 4-16

Figure 4-14 Sensor Mounting Location - OMH Series - Table-top ovens.............................................................. 4-16

Figure 4-15 Sensor Mounting Location - OMH Series - Floor stand ovens............................................................ 4-16

Figure 4-16 Signal Interfaces and Power Socket ..................................................................................................... 4-17

Figure 4-17 Shelf System - OGH Series and OGH-S Series Oven ......................................................................... 4-19

Figure 4-18 Shelf System - OMH Series and OMH-S Series Oven........................................................................ 4-20

Figure 4-19 Viewing Package Front View .............................................................................................................. 4-21

Figure 4-20 Tube Access Ports............................................................................................................................... 4-22

Figure 5-1 Sliding the Retaining Spring into the Support Rail ............................................................................... 5-1

Figure 5-2 OGH and OGH-S Series - Installing the Shelving................................................................................ 5-2

Figure 5-3 OMH and OMH-S Series - Installing the Shelving .............................................................................. 5-2

Figure 5-4 Support Rail Installation....................................................................................................................... 5-3

Figure 5-5 Installing the Rear Air Baffle................................................................................................................. 5-4

Figure 5-6 Removing the Bottom Panel................................................................................................................. 5-5

Figure 5-7 Bottom Panel Removed ........................................................................................................................ 5-5

Figure 5-8 Removing the Lateral Air Baffle ............................................................................................................ 5-6

Figure 5-9 Removing the left and right support profiles......................................................................................... 5-7

Figure 5-10 Removing the rear air baffle OMH 400/750 ...................................................................................... 5-7

Figure 5-11 Shelf Support Bracket Installation ...................................................................................................... 5-8

Thermo Scientific Heratherm i

List of Figures

Figure 5-12 Wire-mesh shelf.................................................................................................................................. 5-9

Figure 5-13 AC Power Supply Socket .................................................................................................................... 5-10

Figure 5-14 Alarm Relay Connection Example ...................................................................................................... 5-15

Figure 7-1 Control Panel for Heratherm OGH Series, OMH Series, OGH-S Series and OMH-S Series Ovens.... 7-1

Figure 10-1 Door seal replacement (example showing OMH Series oven) ............................................................. 10-4

ii Heratherm Thermo Scientific

1

Safety Notes

Basic Operating Precautions

These operating instructions describe Heratherm ovens.

Heratherm ovens have been manufactured to the latest state of the art and been tested
thoroughly for flawless functioning prior to shipping. However, the oven may present
potential hazards, particularly if it is operated by inadequately trained personnel or if it is not
used in accordance with the intended purpose. Therefore, the following must be observed for
the sake of accident prevention:

• Heratherm ovens must be operated by adequately trained and authorized professional
personnel.

• Heratherm ovens must not be operated unless these operating instructions have been fully
read and understood.

• The present operating instructions, applicable safety data sheets, plant hygiene guidelines
and the corresponding technical rules issued by the operator shall be used to create written
procedures targeted at personnel working with the subject matter device, detailing:

• the safety precautions to be taken when processing specific agents,

• the measures to be taken in case of accidents.

• Repair work on the oven must be carried out only by trained and authorized expert
personnel.

• The contents of these operating instructions are subject to change at any time without
further notice.

• Concerning translations into foreign languages, the German version of these operating
instructions is binding.

• Keep these operating instructions close to the oven so that safety instructions and
important information are always accessible.

• Should you encounter problems that are not detailed adequately in these operating
instructions, please contact Thermo Electron LED GmbH immediately for your own safety.

Thermo Electron LED GmbH Heratherm 1-1

Safety Notes
Operational Safety Rules

Operational Safety Rules

The following rules must be heeded when working with Heratherm ovens:

• Observe the sample weight limits specified for your Heratherm oven as a whole and its
shelving in particular; see “Technical Data” on page 13-1.

• Do not load the bottom of the interior workspace to avoid the risk of overheating any
samples placed there.

• Arrange the samples evenly throughout the work space, making sure not to place them
too closely to the interior walls to ensure a uniform temperature distribution.

• Do not load your Heratherm oven with substances that exceed the capabilities of the
available lab apparatus and Personal Protection Equipment to provide sufficient degrees
of protection to users and third parties.

• Check the door seal once a week for proper sealing performance and possible damage.

• Do not process any samples containing hazardous chemical substances that may be
released into the ambient air through defective seals or may cause corrosion or other
defects on parts of the Heratherm oven.

Warranty

Thermo Electron LED GmbH warrants the operational safety and functions of the
Heratherm ovens only under the condition that:

• the oven is operated and serviced exclusively in accordance with its intended purpose
and as described in these operating instructions,

• the oven is not modified,

• only original spare parts and accessories that have been approved by Thermo Electron
LED GmbH are used (third-party spares without Thermo Electron LED GmbH
approval void the limited warranty),

• inspections and maintenance are performed at the specified intervals,

• an installation verification test is performed on commissioning the oven for the first time
and repeated after each inspection and repair activity.

• The warranty is valid from the date of delivery of the oven to the customer.

1-2 Heratherm Thermo Electron LED GmbH

Safety Notes

Explanation of Safety Information and Symbols

Explanation of Safety Information and Symbols

Safety Notes and Symbols Used Throughout These Operating Instructions

Indicates a hazardous situation which, if not avoided, will result in
death or serious injuries.

Indicates a hazardous situation which, if not avoided, could result in
death or serious injuries.

Indicates a situation which, if not avoided, could result in damage to
equipment or property.

Is used for useful hints and information regarding the application.

Thermo Electron LED GmbH Heratherm 1-3

Safety Notes
Explanation of Safety Information and Symbols

Additional Symbols for Safety Information

Wear safety gloves!

Wear safety goggles!

Harmful liquids!

Electric shock!

Hot surfaces!

Fire hazard!

Explosion hazard!

Suffocation hazard!

Danger of tipping!

1-4 Heratherm Thermo Electron LED GmbH

Symbols on the Oven

Observe operating instructions

Mark of conformity USA/Canada

120 Volts AC power socket (60 l devices only)

Alarm contact

Safety Notes

Intended Purpose of the Oven

Intended Purpose of the Oven

Correct Use

Built-in heating and drying ovens Heratherm OGH, OGH-S, OMH and OMH-S are to be
operated up to a working temperature of max. 250 °C (482 °F), only.

Heratherm ovens are laboratory devices for heating applications, equipped with precision
temperature control.

They are designed for heat treating samples or materials at operating temperatures between
50 °C (122 °F) and 330 °C (626 °F) (floor stand ovens: up to 250 °C/482 °F), including - for
example, drying, ageing, analyzing, decomposing, burn-in, oxidizing, reducing, and
preheating.

Heratherm ovens have been designed for installation and operation in the following
environments:

• heat treatment;

• drying of material.

Incorrect Use

To avoid the risk of explosion do not load the oven with tissue, material, or liquids that:

• are easily flammable or explosive;

• release vapor or dust that forms combustible or explosive mixtures when exposed to air;

• release poisons;

Thermo Electron LED GmbH Heratherm 1-5

Safety Notes
Standards and Directives

• create a humid atmosphere;

• release dust;

• exhibit exothermic reactions;

• are pyrotechnical substances;

• exceed the specified hurdle load.

Standards and Directives

The oven complies with the following standards and guidelines:

• IEC EN 61010 - 1, IEC EN 61010 - 2 - 010

• Low Voltage Directive 2006/95/EC

• EMC Directive 2004/108/EC

Additionally, the oven is in compliance with many other international standards, regulations
and directives not listed here. Should you have any questions regarding compliance with
national standards, regulations and directives applicable for your country, please contact
your Thermo Fisher Scientific sales organization.

1-6 Heratherm Thermo Electron LED GmbH

2

Delivery of the Oven

Packaging

Heratherm ovens are delivered in a rugged packaging box. All packaging materials can be
separated and are reusable:

Packaging materials

Packaging carton: Recycled paper

Foam elements: Styrofoam (CFC-free)

Pallet: Chemically untreated wood

Packaging film: Polyethylene

Packaging ribbons: Polypropylene

Acceptance Inspection

After the oven has been delivered, check the delivery immediately for:

• completeness,

• possible damage.

If components are missing or damage is found on the oven or the packaging, in particular
damage caused by humidity and/or water, please notify the carrier as well as Technical
Support immediately.

Risk of injury

Should sharp edges have formed in damaged areas or elsewhere
on the device, take all necessary precautions to protect
personnel handling the oven. For example, have them wear
protective gloves and other personal protection equipment.

Thermo Scientific Heratherm 2-1

Delivery of the Oven
Scope of Supply

Scope of Supply

Ovens

Quantity of components supplied (pieces)

OGH Series
OGH-S Series

OMH-S Series
OMH Series

Wire-mesh shelf 2 2

Support rail for shelf (only for table-top ovens) 0 2

Shelf support 4 4

Power cord 1 1

Connector, potential-free contact 1 1

Clip springs (only for table-top ovens) 0 2

Operating manual 1 1

Short reference guide 1 1

2-2 Heratherm Thermo Scientific

3

Installation

During installation of built-in units, ensure that the
escaping air will be safely discharged out of the
installation space.

Fig. 1

Fig. 2

Ambient Conditions

Location Requirements

Built-in units of incubators can, heating and drying ovens must be operated with an air
exhaust system and exhaust hose (only original Thermo accessory should be used).

For safety reasons, the installation space should be made of non-combustible materials,
according to DIN 4102.

Use with Air Exhaust Systems

For built-in units, a temperature-resistant and corrosion-proof exhaust hose (only original
Thermo accessory) should be used, which can be connected to the air exhaust port with a draft
interrupter.

If several built-in units in a row are connected to a central air exhaust system (see illustration),
a draft interrupter should be installed.

Thermo Scientific Heratherm 3-1

Installation
Ambient Conditions

The oven must only be operated in a location that meets all of the ambient condition
requirements listed below:

• Draft-free and dry indoor location.

• The dust burden may not exceed the contamination category 2 based on EN 61010-1.

• The minimal distance to adjacent surfaces must be observed on all sides (see section

• The operating room must be equipped with appropriate ventilation.

• Solid, level, fire-proof surface and no flammable materials opposite to the rear panel of the oven.

• Vibration-proof substructure (floor stand, lab table) capable of bearing the dead weight

• The ovens have been designed for an operating height of up to 2000 m above sea level.

• Ambient temperature range from 18 °C to 32 °C / 64.4 °F to 89.6 °F.

Using the oven in an atmosphere with electrically conductive dust is prohibited.

“Space Requirement” on page 3-4).

of the oven and its accessories (particularly if two devices are stacked).

• Relative humidity up to 80% (maximum; preferably 60-70%), non condensing.

• Should condensation exist, wait until the moisture has evaporated completely before
connecting the oven to a power source and powering up.

• Avoid direct exposure to sunlight.

• Devices that produce excessive amounts of heat must not be placed near the oven.

• To avoid drying operation without an appropriate fresh air supply make sure that the air
inlet (which may be equipped with an optional fresh air filter) is not obstructed or
blocked by any adjacent objects.

• Power line voltage variations must not exceed ±10 % of the nominal voltage.

• Transient overvoltages must not exceed the values usually encountered throughout the
power supply network. The nominal transient overvoltage level shall be the surge
withstand voltage according to overvoltage category II of IEC 60364-4-443.

• Place the oven on a floor stand (option; to be ordered separately), never on the lab floor.

• Consider installing one dedicated upstream circuit breaker per oven to avoid multiple
device failures in case of an electrical fault.

3-2 Heratherm Thermo Scientific

Intermediate Storage

When the oven is placed in intermediate storage, which is permissible for a maximum of four
weeks, make sure that the ambient temperature is between 20 °C to 60 °C (68 °F to 140 °F)
and the maximum relative humidity does not exceed 90%, non-condensing.

Room Ventilation

Heat dissipating from the oven during continuous operation may cause a change in the room
climate.

• Therefore, the oven must only be installed in rooms with sufficient ventilation.

• Do not install the oven in room recesses without ventilation.

• When several devices are to be placed in the same room, additional ventilation may have to
be provided as necessary.

Installation

Intermediate Storage

• To avoid any impact of the heat dissipated by the oven on the ambient climate the room
must be vented by means of a laboratory-grade ventilation system that complies with
applicable local and national health and safety regulations and has sufficient capacity.

• If excessive temperatures tend to occur in the operating room, be sure to provide a thermal
protection means that cuts out the power supply to mitigate the impact of
overtemperature scenarios.

Use with Air Exhaust Systems

When the oven is connected to an air exhaust system be sure to adjust its air flow so the
temperature distribution pattern throughout the oven's workspace remains unchanged and
precision temperature control is maintained.

Also, be sure to interlock the oven and its exhaust system so both start and run at the same time.
The oven may be unable to overcome the extra flow resistance introduced by the idle air exhaust
system, which may cause the exhaust air to be vented into the surrounding lab room.

Before using existing piping in the building to exhaust hot air from the oven, be sure that such
exhaust piping is made of heat-resistant material, so it will not overheat, melt and/or cause a
fire.

The oven’s outer surfaces and its air exhaust piping may become hot, so be sure to maintain the
proper spacing from walls and ceilings specified by local building codes and/or fire protection
regulations.

• Mark hot exhaust air piping with appropriate hot surface warning signs or restrict access to
such piping altogether to avoid the risk of injury through contact with hot surfaces.

Thermo Scientific Heratherm 3-3

Installation

Fig. 3

After connecting the built-in unit to the electrical
power supply, avoid damaging the power cord, then
sliding into the installation position.

Space Requirement

Space Requirement

For built-in units following clearances should be kept:

A, B, C and D see Operating Instructions of the unit.

E (mm/inch) F (mm/inch) G (mm/inch) H (mm/inch)

100 / 4 50 / 2 80 / 3.2 30 / 1.2

Installation Built-in Units

IGS

IMH/IMH-S

OGS/OMS

OGH/OGH-S
OMH/OMH-S

Clearances, as fig. 3, without exhaust hose.

Clearances, as fig. 3, Close air port with plug, supplied with the unit.

Clearances, as fig. 3, with additional space to operate to air slide, with air exhaust
system and exhaust hose Ø 40 mm (1.58 in)/1.5 m (59 in) (original Thermo
accessory), shortened to required length, installed according to Fig. 1 and 2.

Clearances, as fig. 3, with air exhaust system and exhaust hose Ø 40 mm (1.58 in)/ 1.5
m (59 in) (original Thermo accessory), shortened to required length, installed accord­ing to Fig. 1 and 2, Operating temperature up to max. 250 °C (482 °F).

When installing the oven, make sure that the installation and supply connections remain
freely accessible.

The specified side clearances represent minimum distances.

3-4 Heratherm Thermo Scientific

Table-top ovens

Installation

Space Requirement

Figure 3-1 Table-top ovens, dimensions and required clearances

Table 3-1 Heratherm Oven Dimensions

Model A (mm/inch*)

B (mm/inch) C (mm/inch D (mm/inch)

OMH 60 530 / 20.8 565 / 25.2 720 / 28.3 540 / 21.3

OMH 100 640 / 25.2 565 / 25.2 820 / 32.3 650 / 25.6

OMH 180 640 / 25.2 738 / 29.1 920 / 36.2 650 / 25.6

OMH 60-S 530 / 20.8 565 / 25.2 720 / 28.3 540 / 21.3

OMH 100-S 640 / 25.2 565 / 25.2 820 / 32.3 650 / 25.6

OMH 180-S 640 / 25.2 738 / 29.1 920 / 36.2 650 / 25.6

*

Dimensions in inches are rounded equivalents specified for information only. Depth of handle /display (66 mm/2.6 in) not

included in overall depth specified; height of adjustable feet (36 mm/1.4 in) not included in overall height specified.

Table 3-2 Required Clearances

E (mm/inch) F (mm/inch) G (mm/inch) H (mm/inch)

80 / 3.2 50 / 2 300 / 12 300 / 12

Thermo Scientific Heratherm 3-5

Installation
Space Requirement

Floor Stand Ovens

400 liter units

Figure 3-2 Floor stand ovens, dimensions and required clearances

Table 3-3 Oven Dimensions

Model A (mm/inch) B (mm/inch) C (mm/inch) D (mm/inch)

OMH 400 755 / 29.7 770 / 30.3 1655 / 65.2 810 / 31.9

*

Depth of handle /display (66 mm/2.6 in) not included in overall depth specified. Width of hinge (23 mm) not included in overall width.

Table 3-4 Required clearances

E (mm/inch) F (mm/inch) H (mm/inch) I (mm/inch)

120 / 4.7 50 / 2.0 200 / 7.9 200 / 7.9

3-6 Heratherm Thermo Scientific

750 liter units

Figure 3-3 Floor stand ovens, dimensions and required clearances

Table 3-5 Oven Dimensions

Installation

Space Requirement

Model A (mm/inch) B (mm/inch) C (mm/inch) D (mm/inch)

OMH 750 1215 / 47.8 770 / 30.3 1655 / 65.2 670 / 26.4

*

Depth of handle /display (66 mm/2.6 in) not included in overall depth specified. Width of hinge (23 mm) not included in overall width.

Table 3-6 Required clearances

E (mm/inch) F (mm/inch) H (mm/inch) I (mm/inch)

120 / 4.7 50 / 2.0 200 / 7.9 350 / 13.8

Thermo Scientific Heratherm 3-7

Installation
Transport

Transport

Table-top ovens

For transport, do not lift the oven using the doors or components attached to the oven as lift
points.

Figure 3-4 Lift Points

To avoid injury through physical strain, such as strain traumata
and slipped discs, do not attempt to lift the oven alone!
To avoid injury through dropped loads, be sure to wear Personal
Protection Equipment, such as safety shoes, when lifting the oven.
To avoid crushing your fingers or hands (particularly in a closing
door) or damaging the oven, do not use any other lift points than
those indicated in the illustration above.

Heavy loads! Lift with care!

3-8 Heratherm Thermo Scientific

Floor stand ovens

The floor stand ovens come equipped with four (4) casters. The lever for releasing the caster is
located above the locking lever. After positioning the unit in its installation location ensure
that the locking levers are pressed down on the casters.

To ensure the degree of stability specified by safety requirements the front casters must be
turned so that they are facing forward after the unit has been positioned in its installation
location and the locking levers pressed down on these casters.

Installation

Transport

Danger of tipping when moving!

Before moving the unit, ensure that it has been unplugged.

Move the Heratherm floor stand ovens with caution.

Quick starts and stops can result in tipping!

Always ensure that the doors are closed when moving the unit.

Thermo Scientific Heratherm 3-9

Installation
Stacking Kit

Stacking Kit

The stacking adapter is available only for table-top ovens.

Material Number Description

50126665 Stacking adapter Heratherm 60L

50126666 Stacking adapter Heratherm 100L

50126667 Stacking adapter Heratherm 180L

Scope of Delivery

• 1 stacking adapter

• 1 anti-tilt anchor

• 1 plastic bag with 2 stacking feet and 2 M4x16 Torx screws.

Required Tools

• Slotted screwdriver 5,5x100 or Torx screwdriver 20x100.

Installing the Stacking Feet

1. Remove the left and right blank plugs at the top blank.

2. Install the stacking feet with the enclosed screws using a slotted or Torx screwdriver.

3-10 Heratherm Thermo Scientific

Installing the Stacking Adapter

1

Stacking adapter HTM 60

2

Stacking adapter HTM 100

3

Stacking adapter HTM 180

4

Anti-tilt anchor

Installation

Installing the Stacking Adapter

Stack as follows when using a stacking adapter (numbers denote oven volumes in liters):

• for 60/100/180 on 180 use stacking adapter Heratherm 180L,

• for 60/100 on 100 use stacking adapter Heratherm100L,

• for 60 on 60 use stacking adapter Heratherm 60L.

To prevent the top oven from slipping and dropping down, the following requirements must
be fulfilled before devices may be stacked:

• Only two units may be stacked together. When stacking devices with the same type of
enclosure, yet with a different footprint the device with the smaller footprint must be
placed on top of the one with the larger footprint at all times.

• The bottom device must be correctly levelled.

• Be sure to use the appropriate stacking adapter.

• The levelling feet on the top device must be screwed in all the way.

• The levelling feet of the top device must be aligned with and placed exactly on the stacking
pads of the stacking adapter.

• The anti-tilt anchor must be installed on the top device.

Thermo Scientific Heratherm 3-11

Installation
Installing the Anti-tilt Anchor

Installing the Anti-tilt Anchor

Table-top ovens

The anti-tilt anchor secures the top device in a stack to a solid part of a building. The
anti-tilt anchor is to be mounted on the side opposite of the door hinges.

Bend the fixing tabs of the anti-tilt anchor up on one side and down on the other by an
angle of approx. 90°.

1. Do not use this position if the door is hinged on this side. Right-hand hinges represent
the standard configuration.

2. Preferred position.

3. Alternative position. Do not use if the door is hinged on this side.

Remove the bracket screws. Use the preferred position, if possible.

Fix the anti-tilt anchor with the bracket side down to the unit.

Position the unit with the anti-tilt anchor to in an angle of approx. 90° +/- 20%.

Take care that the stacking feet of the unit are still in correct place on the lower unit or on
the stacking adapter.

Fix the anti-tilt anchor to a solid part of the building.

3-12 Heratherm Thermo Scientific

Floor stand ovens

Unsafe part of the building!

Install the anti-tilt anchor to a solid part of the building, which is able for shoring
loads.

The installation has to be carried out by qualified personnel only.

The connection to the building must be carried out with appropriate screws and
dowels according to the consistence of the building part.

Heratherm floor stand ovens must always be attached to the wall using two (2) retaining
brackets on the outer left and right side on the back of the unit.

Anti-tilt anchors

Installation

Installing the Anti-tilt Anchor

Remove the screws.

Attach the end of the retaining bracket that is facing downward to the unit.

Align the device at roughly 90°, +/-20° to the retaining bracket.

Affix the retaining bracket to the wall.

Thermo Scientific Heratherm 3-13

Installation

Risk of overheating with stacked devices

To avoid the risk of electrical components and the outer enclosure overheating
or temperature control failing due to insufficient ventilation, do not exceed the
specified stacking height!

Risk of tipping and dropping of stacked devices

You should be aware at all times that stacked devices do not form a stable unit,
even when the stacking pads and frames are used correctly. The top device may
tip over and drop down when being transported in a stack. To avoid injury to
persons and damage to equipment, do not attempt to move stacked devices as
a unit! Separate and move each device one by one, then restack them.

Thermo Scientific accepts no responsibility or liability whatsoever with regard
to stacked third party devices; this is at the user’s own risk.

Floor stand oven spacers

Additionally, the following caution notes must be heeded at all times:

Floor stand oven spacers

The spacer on the electrical module must be pulled out and fixed in place before installing
the floor stand oven at its installation location.

1 Loosen the 2 screws

3-14 Heratherm Thermo Scientific

2 Pull out the spacer and slide the screws into the recesses

3 Tighten the two screws

Installation

Floor stand oven spacers

Condensation forming while
operating stacked devices

If stacked devices are operated at an ambient temperature of more than
26 °C (79 °F), temperature control may be adversely affected on the top
device while the decontamination routine is running on the bottom
device. To prevent any impairment of temperature control, make sure that
the space between and around any two stacked devices is well-ventilated
for optimum heat removal.

Thermo Scientific Heratherm 3-15

Installation
Floor stand oven spacers

3-16 Heratherm Thermo Scientific

4

Product Description

This section describes Heratherm advanced protocol ovens for high-end laboratory
applications, which are available in four different versions distinguished by convection method
and safety level:

• Heratherm OGH Series advanced protocol gravity convection ovens (see “Heratherm

OGH Series Oven Overview” on page 4-1);

• Heratherm OGH-S Series advanced protocol security gravity convection ovens and
additional safety functions for the customer (see “Heratherm OGH-S Series Oven

Overview” on page 4-3);

• Heratherm OMH Series advanced protocol mechanical convection ovens (see “Heratherm

OMH Series Oven Overview” on page 4-5);

• Heratherm OMH-S Series advanced protocol security mechanical convection ovens and
additional safety functions for the customer (see “Heratherm OMH-S Series Oven

Overview” on page 4-12).

Heratherm OGH Series Oven Overview

Heratherm OGH Series (OGH is brief for Oven with Gravity convection) advanced protocol
gravity convection ovens come equipped with the following features:

• high-precision work space temperature control, adjustable in steps of one degree up to
330 °C/626 °F;

• boost feature for speed-heating a cold and empty oven;

• an electrically driven damper for venting the work space, adjustable on the control panel;

• countdown, fixed-time, and weekly timers for timed process control;

• two wire-mesh shelves;

• user program support for automating process control;

• an access port for tubing, sensor leads, etc.

Thermo Scientific Heratherm 4-1

Product Description
Heratherm OGH Series Oven Overview

The individual features of OGH Series ovens are shown in the figures below.

Figure 4-1 Heratherm OGH 60/ OGH 100/ OGH 180 Series Front View

[1] Outer door
[2] Door latch cutout
[3] Door latch and handle
[4] Door hinge, lower
[5] Levelling foot
[6] Nameplate
[7] Air baffle, bottom
[8] Air baffle, side
[9]
[10] Door hook catch
[11] Wire-mesh shelf
[12] Support rail for wire mesh shelf
[13] Door seal
[14] Stacking pad
[15] Temperature sensor
[16] Exhaust air tube
[17] Access port

4-2 Heratherm Thermo Scientific

Product Description

Heratherm OGH-S Series Oven Overview

Figure 4-2 Heratherm OGH 60/ OGH 100/ OGH 180 Series Rear View

[1] Door latch and handle
[2] Control panel
[3] Stacking pad
[4] Access port slide
[5] Access port
[6] Spacer
[7] Air outlet aperture
[8]
[9] Air inlet flap, with electrical drive
[10] ­[11] Electronics compartment
[12] Levelling foot

Heratherm OGH-S Series Oven Overview

Heratherm OGH-S Series (OGH-S is brief for Oven with Gravity convection with exacting
Safety requirements) advanced protocol security natural convection ovens come equipped with
the features also found in OGH Series devices, including:

• high-precision work space temperature control, adjustable in steps of one degree up to
330 °C/626 °F;

• boost feature for speed-heating a cold and empty oven;

• an electrically driven damper for venting the work space, adjustable on the control panel;

• countdown, fixed-time, and weekly timers for timed process control;

• two wire-mesh shelves;

• an access port for tubing, sensor leads, etc.;

• user program support for automating process control.

Additionally, OGH-S Series ovens offer the following extra functionality:

• a lockable door to secure a running process against unauthorized access;

• a door switch and indicator on the control panel to indicate that the door is open;

Thermo Scientific Heratherm 4-3

Product Description
Heratherm OGH-S Series Oven Overview

• a sample protection feature that reduces the oven’s work space temperature to a safe level
when the internal controller is subject to an error condition;

• monitoring of lower temperature;

• preparation for sample sensor accessory;

• ECO drying support (requires optional sample sensor).

The individual features of OGH-S Series ovens are shown in the figures below.

Figure 4-3 Heratherm OGH-S Front View

[1] Outer door
[2] Door switch
[3] Door latch and handle
[4] Door hinge, lower
[5] Levelling foot
[6] Nameplate
[7] Air baffle, bottom
[8] Air baffle, side
[9]
[10] Door hook catch
[11] Wire-mesh shelf
[12] Support rail for wire mesh shelf
[13] Door seal
[14] Stacking pad
[15] Temperature sensor
[16] Exhaust air tube
[17] Access port

4-4 Heratherm Thermo Scientific

Product Description

Heratherm OMH Series Oven Overview

Figure 4-4 Heratherm OGH-S Rear View

[1] Door latch and handle
[2] Control panel
[3] Stacking pad
[4] Access port slide
[5] Access port
[6] Spacer
[7] Air outlet aperture
[8] Sample sensor connection
[9] Air inlet flap, with electrical drive
[10] ­[11] Electronics compartment
[12] Levelling foot

Heratherm OMH Series Oven Overview

Heratherm OMH Series (OMH is brief for Oven with Mechanical convection) advanced
protocol mechanical convection ovens come equipped with the following features:

• high-precision work space temperature control, adjustable in steps of one degree up to
330 °C/626 °F (floor stand oven: up to 250 °C/482 °F);

• boost feature for speed-heating a cold and empty oven (only for table-top ovens);

• a variable-speed fan for optimizing temperature uniformity throughout the work space;

• an electrically driven damper for venting the work space, adjustable on the control panel;

• countdown, fixed-time, and weekly timers for timed process control;

• two wire-mesh shelves;

• an access port for tubing, sensor leads, etc.

• user program support for automating process control.

• door switch for floor stand ovens

Thermo Scientific Heratherm 4-5

Product Description
Heratherm OMH Series Oven Overview

The individual features of OMH Series ovens are shown in the figures below.

Figure 4-5 Heratherm OMH 60/ OMH 100/ OMH 180 Series Front View

[1] Outer door
[2] Door latch cutout
[3] Door latch and handle
[4] Door hinge, lower
[5] Levelling foot
[6] Nameplate
[7] Air baffle, top piece
[8] Support rail for wire mesh shelf
[9]
[10] Door hook catch
[11] Wire-mesh shelf
[12] Support rail for wire mesh shelf
[13] Door seal
[14] Stacking pad
[15] Spring for support rail
[16] Temperature sensor
[17] Exhaust air tube
[18] Access port

4-6 Heratherm Thermo Scientific

Product Description

Heratherm OMH Series Oven Overview

Figure 4-6 Heratherm OMH 60/ OMH 100/ OMH 180 Series Rear View

[1] Door latch and handle
[2] Control panel
[3] Stacking pad
[4] Access port slide
[5] Access port
[6] Exhaust air tube
[7] Air outlet aperture
[8] Fan
[9] Air inlet flap, with electrical drive
[10] ­[11] Electronics compartment
[12] Levelling foot

Thermo Scientific Heratherm 4-7

Product Description
Heratherm OMH Series Oven Overview

Figure 4-7 Heratherm OMH 400 Series Front View

[1] Outer door
[2] Door latch
[3] Unit caster
[4] ­[5] Wire-mesh shelf
[6] Door hook catch
[7] ­[8] Temperature sensor
[9] Access port
[10] ­[11] ­[12] ­[13] ­[14] ­[15] ­[16] ­[17] ­[18] ­[19] ­[20] ­[21] Fan opening, air baffle

4-8 Heratherm Thermo Scientific

Product Description

10

Heratherm OMH Series Oven Overview

Figure 4-8 Heratherm OMH 400 Series Rear View

[1] Outer door
[2] ­[3] Unit caster
[4] ­[5] ­[6] ­[7] ­[8] ­[9] ­[10] Exhaust air tube
[11] Access port
[12] Anti-tilt anchor
[13] Electronics compartment
[14] Air inlet flap, with electrical drive
[15] Hinge, right
[16] Handle
[17] Display
[18] Nameplate
[19] ­[20] ­[21] ­[22] Fan

Thermo Scientific Heratherm 4-9

Product Description
Heratherm OMH Series Oven Overview

Figure 4-9 Heratherm OMH 750 Series Front View

[1] Outer door
[2] Door hook catch
[3] Unit caster
[4] Air baffle
[5] Wire-mesh shelf
[6] Door latch
[7] ­[8] Temperature sensor
[9] Access port
[10] ­[11] ­[12] ­[13] ­[14] ­[15] ­[16] ­[17] ­[18] ­[19] ­[20] ­[21] Fan opening, air baffle

4-10 Heratherm Thermo Scientific

Product Description

Heratherm OMH Series Oven Overview

Figure 4-10 Heratherm OMH 750 Series Rear View

[1] Outer door
[2] ­[3] Unit caster
[4] ­[5] ­[6] ­[7] ­[8] ­[9] ­[10] ­[11] Access port
[12] Anti-tilt anchor
[13] Electronics compartment
[14] ­[15] Hinge, right
[16] Handle
[17] Display
[18] Nameplate
[19] Hinge, left
[20] Air inlet flap, with electrical drive
[21] ­[22] Fan

Thermo Scientific Heratherm 4-11

Product Description
Heratherm OMH-S Series Oven Overview

Heratherm OMH-S Series Oven Overview

Heratherm OMH-S Series (OMH-S is brief for Oven with Mechanical convection for
High-end laboratory applications with exacting Safety requirements) advanced protocol
security mechanical convection ovens come equipped with the features also found in OMH
Series devices, including:

• high-precision work space temperature control, adjustable in steps of one degree up to
330 °C/626 °F;

• boost feature for speed-heating a cold and empty oven;

• a variable-speed fan for optimizing temperature uniformity throughout the work space;

• an electrically driven damper for venting the work space, adjustable on the control panel;

• countdown, fixed-time, and weekly timers for timed process control;

• two wire-mesh shelves;

• an access port for tubing, sensor leads, etc.;

• user program support for automating process control.

Additionally, OMH-S Series ovens offer the following extra functionality:

• a lockable door to secure a running process against unauthorized access;

• a door switch and indicator on the control panel to indicate that the door is open;

• a sample protection feature that reduces the oven’s work space temperature to the
setpoint when the heating control system is subject to an error condition.

• Monitoring of lower temperature

• Preparation for sample sensor accessory

• ECO drying support (requires optional sample sensor).

4-12 Heratherm Thermo Scientific

Product Description

Heratherm OMH-S Series Oven Overview

The individual features of OMH-S Series ovens are shown in the figures below.

Figure 4-11 Heratherm OMH-S Front View

[1] Outer door
[2] Door switch
[3] Door latch and handle
[4] Door hinge, lower
[5] Levelling foot
[6] Nameplate
[7] Air baffle, top piece
[8] Shelf support
[9] ­[10] Door hook catch
[11] Wire-mesh shelf
[12] Support rail for wire mesh shelf
[13] Door seal
[14] Stacking pad
[15] Spring for support rail
[16] Temperature sensor
[17] Exhaust air tube
[18] Access port, exhaust air port

Thermo Scientific Heratherm 4-13

Product Description

10

8

Heratherm OMH-S Series Oven Overview

Figure 4-12 Heratherm OMH-S Rear View

[1] Door latch and handle
[2] Control panel
[3] Stacking pad
[4] Access port slide
[5] Access port
[6] Spacer
[7] Air outlet aperture
[8] Sample sensor connection
[9] Air inlet flap, with electrical drive
[10] Fan
[11] Electronics compartment
[12] Levelling foot

4-14 Heratherm Thermo Scientific

Safety Devices

The oven is equipped with the following safety features:

• a sample protection feature that safeguards the samples against destruction through
overheating in case of contoller failure;

• an overheat protection cut-out feature that shuts down the oven completely when excessive
temperatures occur in the workspace;

• dual fuses rated at 16 amperes.

Operating Environment

To ensure undisturbed operation, the ambient temperature in the operating room must be at
least 18 °C (64.4 °F). The heating system controls the temperature in the oven’s workspace of
50 °C/122 °F up to the maximum of 330 °C/626 °F (floor stand oven: 250 °C/482 °F).

Product Description

Safety Devices

Door Switch

Heratherm OGH 60/100/180-S and Heratherm OMH 60/100/180/400/750 ovens come
with a door switch integrated into the latch mechanism. If the door switch is activated by
opening the door, heating operations in the work space are suspended and an icon is
illuminated in the display window (see D4 in figure 7-1 on page 7-1).

If the door remains open for more than 30 seconds, a short audible alarm is sounded in
addition to the icon in the display window. If the door is left open for more than 10 minutes,
an audible alarm is sounded, a “door open” (E001) alarm message appears in the display and is
issued through the RS-232 interface, and the alarm relay is energized.

Thermo Scientific Heratherm 4-15

Product Description
Sensing and Control System

Sensing and Control System

The PT 100-type sensor for the control of the work space temperature and for the thermal
protection [1] is mounted in the top panel of the work space compartment.

Figure 4-13 Sensor Mounting Location - OGH Series - Table-top ovens

Figure 4-14 Sensor Mounting Location - OMH Series - Table-top ovens

Figure 4-15 Sensor Mounting Location - OMH Series - Floor stand ovens

4-16 Heratherm Thermo Scientific

Product Description

Data Communications & Alarm Interface

The work space temperature sensor provides the inputs to the oven’s built-in controller, which
continuously compares the measured values to the user-specified set value and adjusts the
heaters according to the result.

Do not remove the protective hose from the sensor.
Protect the sensor from mechanical damage.

The unit features a thermal protection function that is factory-preprogrammed and not
adjustable. It protects the samples in the work space from overheating: Thermal protection
kicks in on a brief violation of the upper limit, based on the user-selected temperature set
value, automatically reducing the work space temperature to the user-specified set value and
allowing the heating process to continue even in case of a controller malfunction. If the
thermal protection is activated, the error message (E111) “Temperature too high” appears in
the display window and an audible alarm is sounded.

When the user acknowledges the error message, the red alarm icon (D4 in figure 7-1 on

page 7-1) is illuminated and the Temperature Set Value icon (see table 7-3 on page 7-4) is

highlighted by a red border to indicate that thermal protection has kicked in.

Data Communications & Alarm Interface

All signal connections are installed in the electrical interface panel at the rear of the oven.

RS-232 Interface

The RS- 232 interface (left in figure 4-16 below) may be used to connect ovens to the serial
interface port of a computer to allow for the computer-aided acquisition and documentation
of major operating parameters (temperature, error codes, etc.).

Figure 4-16 Signal Interfaces and Power Socket

Thermo Scientific Heratherm 4-17

Product Description
Work Space Components

Alarm Contact

The oven can be connected to an on-site, external alarm system (such as a private branch
telephone exchange, a facility monitoring system, visual or audible alarm indicators; see

“Wiring the Alarm Contact” on page 5-14). For this purpose, the devices come with a

pre-wired potential-free alarm contact (see figure 4-16). The alarm contact is energized
whenever an error occurs in an internal control loop or the oven’s electrical circuits or
hardware.

AC Power Socket

The oven is connected to the AC supply mains via the socket at right in figure 4-16 above,
which accepts a power cord with an IEC standard plug [9].

Fuses

Two 16 A slow-blow fuses mounted on the oven’s main electronic circuit board protect
internal circuitry from the impact of excessive power consumption.

With product option “Viewing Windows with Workspace Lighting”, the lamps are
protected with a 5 A fuse placed in the electronic compartment.

Replacement should only be carried out by skilled and authorized
qualified personnel of electrotechnology/signal engineering!

The device fuses are not user-serviceable. When the oven exhibits the
typical signs of a blown fuse (no response to pressing the On/Off button,
control panel remains extinguished, no heating operation), call
Customer Service to have the fuses replaced.

Work Space Components

Fuse replacement

Inner Chamber

All components of the work space are made of corrosion-resistant stainless steel and have an
absolutely smooth and easy-to-clean surface. Any embossings have a large radius.

4-18 Heratherm Thermo Scientific

Shelf System

The oven is supplied with two wire-mesh shelves. The shelf support rails have an alternating
pattern of oblong and round perforations spaced evenly at 30 mm, allowing the shelf support
brackets to be inserted without any room for error, yet in a very flexible way to accommodate
different heights of sample containers. The shelves have an integrated tilt protection and
withdrawal stop. For details on using the shelf system, see the section “Start-up” on page 5-1.

.

Product Description

Work Space Components

[1] Retaining spring
[2] Air baffle, lateral
[3] Shelf support
[4] Wire-mesh shelf
[5] Air baffle, bottom

Figure 4-17 Shelf System - OGH Series and OGH-S Series Oven

Thermo Scientific Heratherm 4-19

Product Description
Product Options of Table-top Ovens

[1] Retaining spring
[2] Air baffle, rear
[3] Shelf support
[4] Wire-mesh shelf
[5] Support rail

Figure 4-18 Shelf System - OMH Series and OMH-S Series Oven

Product Options of Table-top Ovens

This section describes the options available for the Heratherm heating and drying ovens for
high end laboratory applications.

Door Fitted with Viewing Windows and Workspace Lighting

Heratherm heating and drying ovens may be equipped with a Viewing Package. With
devices of 60 and 100 liters workspace volume, this package consists of one viewing window
plus workspace lighting, while devices with 180 liters are fitted with two viewing windows
and workspace lighting.

The workspace lighting is not designed for use as a permanent illumination source, but
rather intended to allow brief visual checks of the device‘s interior. The Viewing Package
limits the operating temperature range of the heating and drying oven to 250 °C (482 °F).

4-20 Heratherm Thermo Scientific

Product Description

1

2

3

4

5

6

Tube Access Ports of Table-top ovens

Figure 4-19 Viewing Package Front View

[1] Control panel
[2] Door latch and handle
[3] Levelling foot
[4] Nameplate
[5] Door hinge, lower
[6] Viewing window

Tube Access Ports of Table-top ovens

Heratherm heating and drying ovens may be equipped with additional tube access ports in the
side and top panels.

Available tube access port options are listed in table 4-1 below.

Table 4-1 Tube Access Ports for Heratherm Heating and Drying Ovens (Option)

Model

OGH and OGH-S 19 or 53 24 or 58

OMH and OMH-S 24 or 58 24 or 58

Side Panel Mounted Port,
dia. in mm

Top Panel Mounted Port,
dia. in mm

The tube access ports are mounted in fixed locations in the side and top panels (see

figure 4-20).

Thermo Scientific Heratherm 4-21

Product Description

1

2

3

Tube Access Ports of Table-top ovens

Figure 4-20 Tube Access Ports

[1] Top panel mounted tube access port
[2] Side panel mounted tube access port
[3] Sealing cover for side panel mounted tube access port

Once the cables, tubes or other conduits have been inserted, the tube access ports must be
padded with the heat-resistant fiber pads shipped with the device and the cap must be
mounted to seal the port as far as possible.

Risk of Burning on Hot Surface

The surface around the tube access ports may become extremely
hot.

4-22 Heratherm Thermo Scientific

5

Start-up

Table-top ovens

Installing the Shelf System

The installation of the shelf system does not require any tools. The support rails are secured in
place by spring action. Once the shelf support brackets have been inserted into the rails, the
wire-mesh shelves can be simply pushed onto their support hooks to complete the installation.

The support rails of the floor stand ovens cannot be removed.

Initial installation

Heratherm OGH and OGH-S Series ovens have the shelving support rails integrated with the
air baffles, which are readily pre-installed when the devices are shipped from the factory.

Heratherm OMH and OMH-S Series ovens come with separate support rails, which need to
be installed as follows:

1. Peel off the protective foil from the support rails.

2. Push the retaining spring [1] into the guide on the support rail [2], making sure that the
locking nub [3] on the retaining spring safely engages with the matching hole in the
support rail.

.

Figure 5-1 Sliding the Retaining Spring into the Support Rail

Thermo Electron LED GmbH Heratherm 5-1

Start-up
Installing the Shelving

Installing the Shelving

The illustrations below show the placement of the shelf system elements.

[1] Retaining spring
[2] Air baffle, lateral
[3] Shelf support
[4] Wire-mesh shelf
[5] Air baffle, bottom

Figure 5-2 OGH and OGH-S Series - Installing the Shelving

[1] Retaining spring
[2] Air baffle, rear
[3] Shelf support
[4] Wire-mesh shelf
[5] Support rail

Figure 5-3 OMH and OMH-S Series - Installing the Shelving

5-2 Heratherm Thermo Electron LED GmbH

Preparing the Work Space

The following work space components should be checked for cleanliness and cleaned prior to
use:

• support rails,

• shelf support,

• wire-mesh shelves,

• work space surfaces,

• work space seals and gaskets,

For details about the cleaning of the oven, please refer to the section

“Cleaning” on page 9-1.

Disinfection

Start-up

Preparing the Work Space

Table-top ovens

Installation or Removal of the Support Rails (OMH Series and OMH-S
Series only)

Figure 5-4 Support Rail Installation

The embossings at [2] and [7] act as lateral guides for the support rails, while the embossings
at [1] and [6] secure the support rails in place. For the support rails to install correctly the
retaining spring [3] must be facing upwards.

Thermo Electron LED GmbH Heratherm 5-3

Start-up
Preparing the Work Space

1. Place the support rail [4] on the lower embossing [6] and tilt it upwards against the work
space side wall so that the rail is positioned over the two embossings at [5] and [2].

2. Clamp the retaining spring [3] behind the upper embossing [1].

3. To remove the support rails, pull the retaining spring tab down out of the embossing and
remove the support rail assembly.

Installing and Uninstalling the Rear Air Baffle (OMH Series and OMH-S
Series only)

Heratherm OMH Series and OMH-S Series ovens are shipped from the factory with an air
baffle readily pre-installed at the back wall of the work space (while OGH Series and
OGH-S Series ovens do not have this feature). Before the air baffle can be removed from the
back wall, the support rails need to be uninstalled as explained further above.

Figure 5-5 Installing the Rear Air Baffle

1. Losen the two screws [1] that hold the air baffle to the back wall of the work space.

Risk of damage to sensor!

To prevent accidental damage, be sure to avoid collision with the sensor
when installing or uninstalling panels in the oven‘s workspace.

2. Grab the two retaining springs [2] at their tabs and pull them downwards out of the
embossings, then pull off the rear air baffle.

3. For the rear air baffle to install correctly, the two retaining springs [2] must be facing
upwards. Place the air baffle on the lower embossings and tilt it upwards against the back
wall of the work space.

4. Clamp the two retaining springs [2] into the upper embossings.

5. Secure the air baffle to the work space back wall by fastening the two screws at [1].

5-4 Heratherm Thermo Electron LED GmbH

Preparing the Work Space

Installing and Uninstalling the Lateral Air Baffles (OGH Series and
OGH-S Series only)

The following section describes the installation and removal of the lateral air baffles.

Start-up

Figure 5-6 Removing the Bottom Panel

1. Losen the two screws [1] in the bottom panel, then remove the entire bottom panel by
lifting it out of its two embossings.

Figure 5-7 Bottom Panel Removed

2. Grab the two retaining springs [1] at their tabs and pull them downwards out of the
embossings, then pull off the lateral air baffle.

Thermo Electron LED GmbH Heratherm 5-5

Start-up
Preparing the Work Space

Risk of damage to sensor!

To prevent accidental damage, be sure to avoid collision with the sensor
when installing or uninstalling panels in the oven‘s workspace.

Figure 5-8 Removing the Lateral Air Baffle

3. For the lateral air baffles to install correctly, the two retaining springs [1] must be facing
upwards. Place the lateral air baffle on the lower embossings and tilt it upwards against
the side wall of the work space.

4. Clamp the two retaining springs [1] into the upper embossings.

5. Replace the bottom panel into the embossings and secure it by fastening the two screws
at [1].

Levelling the Oven

1. Position a bubble level onto the center shelf.

2. Manually adjust the levelling feet until the wire-mesh shelf is horizontally aligned in all
directions. Perform the adjustment of the levelling feet from left to right and from rear to front.

5-6 Heratherm Thermo Electron LED GmbH

Commissioning of floor stand ovens

Installing/Removing air baffles (OMH Series)

Start-up

Commissioning of floor stand ovens

Figure 5-9 Removing the left and right support profiles

Loosen and remove the eight (8) screws for the left and right support profiles and then take out
the lateral air baffles.

Figure 5-10 Removing the rear air baffle OMH 400/750

On the OMH 400 model loosen and remove the six (6) screws for the rear air baffle and for
model OMH 750 loosen and remove the six (6) screws for the top and bottom rear air baffles
and then remove the air baffle(s).

Thermo Electron LED GmbH Heratherm 5-7

Start-up
Commissioning, general

Commissioning, general

Installing the Shelf Support Brackets

1. Insert the shelf support brackets [3] into the perforations [1] of the support rail and air
baffle and tilt them downwards.

Please note the alternating sequence of round and oblong holes. Be
sure to use the correct pair of opposite holes, so the support rails are
truly horizontal.

2. Make sure that the two vertical elements [2] of the shelf support bracket butt against the
support rail and air baffle.

Horizontal position of support rails

Figure 5-11 Shelf Support Bracket Installation

5-8 Heratherm Thermo Electron LED GmbH

Installing the Wire-mesh Shelves

Figure 5-12 Wire-mesh shelf

1. Push the wire-mesh shelf onto the shelf support brackets with the tilt protection devices
[1] facing the rear panel of the oven. The tilt protection devices [1] also serve as guides for
the wire-mesh shelves.

Start-up

Connecting Power

2. Slightly raise the wire-mesh shelf so that the pull-out stops [2] can slide over the shelf
support brackets.

3. Make sure that the shelves and both of their tilt protection devices are free to move over
the shelf support brackets.

Connecting Power

The oven has a class I, protection-earthed enclosure. To minimize the risk of electrical shock,
use the AC power cord supplied to connect the oven to a correctly installed and
protection-earthed power supply source, with the following features in place for each oven:

• T 16 A slow-blow fusing

Electric shock

Contact with live electrical components may cause a lethal electric
shock. Before connecting the oven to the power supply, check the
power cord and the plug for damage. Do not use damaged cables
for connecting the oven to the power supply!

• B 16 circuit breaker

Thermo Electron LED GmbH Heratherm 5-9

Start-up
Connecting Power

Although several devices may be operated on the same electrical feeder
if the rated current is not exceeded, we strongly recommended to
provide one feeder with a dedicated upstream circuit breaker per oven to
avoid the failure of multiple devices in case of an electrical fault.

Connection to the Power Supply Source

1. Before connecting the oven to the power source, check to see if the power supply voltage
corresponds with the specifications on the nameplate on the front of the oven. If the
voltage (V) and current (A) ratings given are not as required, do not connect the oven to
the power source!

2. Make sure the alarm contact remains disconnected at this time. If connected, disconnect
it now to avoid a false alarm on the receiving end. You will get back to the alarm contact
later on as you work your way through this start-up procedure.

Benefits of using separate electrical
feeders

3. Connect the IEC connector to the socket at the rear of the oven.

4. Route the power cord along a path that does not cross exhaust air piping or passageways
and aisles. With stacked devices, keep the power cord away from hot spots on the other
oven in the stack.

5. Connect the protection-earthed plug of the power cord to a correctly protection-earthed
and earth leakage circuit breaker fused power socket.

6. Make sure the power cord is not subjected to tensile or compressive force.

Make sure that power outlets remain
freely accessible at all times!

In an emergency the power connection
must be rapidly disconnectable; so be sure to have the power outlets
freely accessible at all times!

[1] Sample /ECO Sensor
[2] RS 232 interface
[3] Alarm contact
[4] Power socket
[5] 5 A fuse (with option “Viewing Windows with Workspace Lighting”, only)

Figure 5-13 AC Power Supply Socket

5-10 Heratherm Thermo Electron LED GmbH

Start-up

Connecting the RS-232 Interface

Condensation

When taking the oven into operation for the first time allow some time for
stabilization before switching on to avoid condensation forming on live
parts.

Switching the Power Line Voltage

The 240 V versions of Heratherm ovens are equipped with a wide-range power supply unit
that permits them to be operated on a 240 V or 208 V power source. For optimum heating
performance, though, the operating parameters of the built-in controller can be customized in
software to obtain the best performance on either line voltage, 240 V or 208 V. This is
achieved by entering two specific configuration codes in the Settings -> Configuration
dialog explained in “Configuration” on page 7-36.

Q

Table 5-1 Line Voltage Selection Codes

Line Voltage Enter Code

208 V 0208

240 V 0240

Connecting the RS-232 Interface

Replacement should only be carried out by skilled and authorized
qualified personnel of electrotechnology/signal engineering!

The RS-232 data communication interface supports the querying of status information and
temperature data from the oven by entering basic commands in a standard terminal window
provided by your computer’s operating system. The interconnection requires a standard
RS-232 cable with 9-pin connectors and a straight “1:1” pinout without any crossed wires,
which is not supplied with the oven.

Thermo Electron LED GmbH Heratherm 5-11

Start-up
Connecting the RS-232 Interface

Users may employ the RS-232 command inventory listed in table 5-2 below for automating
process data logging - for example, by embedding these commands in scripts that run on a
remote computer.

To avoid overloading and damaging the RS-232 interface check the
interfacing parameters against the pin-out description given above and
make sure that computer’s interface port works with a signal level of +/­5V DC.

Interconnecting the Oven with a Computer

1. Turn the computer off.

2. Route the serial interface cable along a path that does not cross hot exhaust air piping,
tables, aisles or passageways.
With stacked devices, keep the serial interface cable away from hot spots on the other
oven in the stack.

RS-232 interface compatibility

3. Connect one connector of the serial interface cable (cable length, 5 to max. 10 m, not
supplied as a standard item) to the socket labeled RS 232 in the electrical interfaces
section at the rear of the oven (see “Signal Interfaces and Power Socket” on page 4-17).

4. Connect the second connector to an unused COM 1 /COM 2 or other serial port on the
computer.

5. Boot the computer.

6. Launch your standard terminal program and set up the connection with the following
parameters:

— 57600 bits per second

— 8 data bits

— 1 stop bit

— No Parity

7. Once your terminal indicates that serial communication has been established
successfully, enter any of the commands listed in table 5-2 below, depending on what
type of information you want to query.

5-12 Heratherm Thermo Electron LED GmbH

Command Syntax Rules

Be sure to enter the commands exactly as shown in the examples
in table 5-2 below. Unsupported parameter addresses may lead to
serious hardware malfunctions or damage the device, while
unknown characters will result in error messages.

8. Use the following generic command syntax:

?:aaaa:bb::cc<CR> , where:

— ?: identifies the command line as a query;

— aaaa: is the parameter address;

— bb:: is a query, that must be left at „00“ for technical reasons;

Start-up

Connecting the RS-232 Interface

— cc is for a command - specific checksum listed in the table below.

— <CR> is for carriage return.

You will receive a response of the following general format:

!:aaaa:bb:XXXXX:cc<CR>

, where:

— !: identifies the line as a response to a query;

— aaaa: is the parameter address entered with the query;

— bb: is the number of payload bytes in hexadecimal code - for example, 1F for the

decimal value 31;

— XXXXXX: is the significant status information queried;

— cc: is a check sum (technically an inverted XOR of all bytes returned, excluding the

check sum bytes and the <CR> character);

— <CR> is for carriage return.

Table 5-2 Terminal Commands for Querying Data

Command Syntax Response Example

Combined Date and Time

?:0010:00::c1 !:0010:11:31.07.10;01:02:23:e2

Date Time

Date only

?:0011:00::c0 !:0011:08:31.07.10:d2

Date

Time only

Thermo Electron LED GmbH Heratherm 5-13

Start-up

2

Wiring the Alarm Contact

Table 5-2 Terminal Commands for Querying Data

Command Syntax Response Example

?:0012:00::c3 !:0012:08:01:02:23:dc

Temperature Set Value (T1); Current Work Space Temperature (T2); Reference
Temperature (T3); Sample Sensor Temperature (T4)

?:3010:00::c2 !:3010:1f:+125.00;+124.96;+000.000;+000.00:b0

Wiring the Alarm Contact

Thermo Electron LED GmbH warrants the operational safety and the
operativeness of the oven only if installation and repairs are performed
by skilled personnel.

Time

T1 T2 T3 T4

Skilled work

The connection of the oven to an external alarm system must only be
carried out by adequately trained and authorized electrical engineering
or telecommunications expert personnel!

Functional Description

When system errors and failures occur in the temperature control circuits, an alarm message
is issued to the connected alarm monitoring system. The potential-free contact (single
changeover-type contact) has been designed for the circuit configuration specified below.

The alarm relay is energized by all error conditions reported by internal control
loops.

Alarm Relay Specifications

Switching behavior

5-14 Heratherm Thermo Electron LED GmbH

Connection Example

The connector [5] for the interface cable is supplied with the oven as a standard item.
Specifications for the operating voltage and the fusing of external alarm circuitry are given in
the table on the previous page.

1. Wire the individual conductors [1] through [4] of the interface cable as shown in the
wiring diagram.

Start-up

Wiring the Alarm Contact

Alarm contact electrical compatibility
considerations

To avoid overloading and damaging the alarm contact, check the
electrical interfacing parameters of the alarm-receiving system for
compatibility with the alarm relay specifications given above.

2. Route the alarm cable along a path that does not cross hot exhaust air piping, tables, aisles
or passageways.
With stacked devices, keep the alarm cable away from hot spots on the other oven in the
stack.

3. Plug the alarm system interface cable connector into the interface port [5] in the rear panel
of the oven.

Figure 5-14 Alarm Relay Connection Example

The circuit diagram shown above represents the undisturbed condition of operation. In case of
an error condition - including a power outage - contact closure occurs on the path between
contacts 1-4.

Thermo Electron LED GmbH Heratherm 5-15

Start-up
Wiring the Alarm Contact

5-16 Heratherm Thermo Electron LED GmbH

6

Operation

Preparing the Oven

The oven must not be released for operation before all major start-up activities have been
completed (see “Start-up” on page 5-1).

Device Check

Prior to starting operation, the following oven components must be checked for their correct
function:

• The door seal in the front frame must not be damaged.

• The shelving components must be installed safely.

Disinfecting the Oven’s Work Space

Disinfect the work space according to the operator-specified hygiene guidelines.

Starting Operation

1. Turn the oven on using the control panel.

2. Adjust the temperature set value on the control panel.

3. The temperature controller starts adjusting the work space to the user-specified
temperature set value now.

4. Load the work space with samples.

To avoid any risk of explosion or fire

• refrain from loading the oven with any of the substances listed
in the section “Incorrect Use” on page 1-5

• make sure that the ambient air is free of any solvents

• do not operate the oven in areas with an explosion hazard

Thermo Scientific Heratherm 6-1

Operation
Starting Operation

Risk of overloading

Overloading may damage the
shelves or cause the shelves and/or the oven to tilt when the
shelves are being drawn out, ultimately destroying the samples.
To avoid overloading the oven or its shelving be sure to observe
the sample weight limits specified in see “Technical Data” on
page 13-1

Hot surfaces

After opening the door, this may swing back automatically.

The interior panel of the outer door as well as the surfaces of the outer
housing, the shelving and the work space become extremely hot while
the oven runs through its heating cycles.

When removing samples from a running or recently completed heating
cycle, always wear safety gloves and other appropriate personal
protection equipment to avoid burns on hot surfaces!

Proper loading

To ensure sufficient air circulation and uniform heating of the samples,
do not use more than 70% of the maximum surface area of the work
space. Bulky objects in the work space that dissipate heat may impair
heat distribution.

6-2 Heratherm Thermo Scientific

7

Handling and Control

D1

D2

K2

K1

K3

16.04.2010 13:33

Timer

On Off

D3

D5

D6

K4

K5

D4

Heratherm OGH Series, OMH Series, OGH-S Series and OMH-S Series ovens come with a
front panel mounted control unit consisting of a multifunctional display, four control buttons,
and an on/off button. The four control buttons interact with the display window to let users
access all of the user control functions and adjustments of the oven, including - for example,
the temperature set value, timer, as well as a variety of other functions.

Under normal operating conditions the display presents user with the work space temperature.
The display returns to its default mode upon completion of the adjustments or whenever no
entries have been made for a period of 30 seconds.

The graphic below shows the Heratherm OGH 60/100/180, Heratherm
OMH 60/100/180/400/750, Heratherm OGH 60/100/180-S, and Heratherm OMH
60/100/180-S control panel with all of its visualization elements and controls.

Figure 7-1 Control Panel for Heratherm OGH Series, OMH Series, OGH-S

Series and OMH-S Series Ovens

The table below contains brief descriptions of the buttons on the control panel (items K1
through K5 in figure 7-1 above).

Thermo Scientific Heratherm 7-1

Handling and Control

Table 7-1 Control Buttons

Icon Item Function

K1 Menu/Enter button

First key press: Activates the menu, highlighting the first menu

item with a red border.
Second key press: Selects the currently activated menu item
(as highlighted by the red border), depending on the currently
selected function, pressing this button enables entries with item
D2, D5 or D6.
Third key press (once a setting has been changed): Confirms
a previous entry or selection.

K2 Left button

After the first press of the Menu/Enter button:

- Moves the selection in the menu (see item D3) to the next icon
on the left.

Once a menu item has been selected:

- Decreases an adjustable parameter value - for example, the
temperature set value in D5 or the fan speed level at D6. Hold­ing this button depressed for a few seconds changes the
selected value in quick run mode.

- Moves the selection in the multifunctional display pane at D2 to
the next option on the left - for example, from the
the timer to On.

Off

state of

K3 On/Off button

Holding this button depressed for 2 seconds switches the oven
off. The display window goes out, except for the readiness indi­cator icon in the status display area at item D4.
The temperature display pane D1 provides as dimmed readout
of the work space temperature, provided that the temperature
exceeds 50 °C (122 °F).

K4 Right button

After the first press of Menu/Enter button:

- Moves the selection in the menu (see item D3) to the next icon
on the right.

Once a menu item has been selected:

- Increases an adjustable parameter value - for example, the
temperature set value in D5 or the fan speed level at D6. Hold­ing this button depressed for a few seconds changes the
selected value in quick run mode.

- Moves the selection in the multifunctional display pane at D2 to
the next option on the right - for example, from the On state of
the timer to

K5

Escape

Returns to the previous level of the menu or standard display.
Upon exiting from the current menu item the user may be
prompted to save any previously made settings.

button

Off

.

The table below contains brief descriptions of the display features of the control panel (items D1
through D6 in

7-2 Heratherm Thermo Scientific

figure 7-1; the identifiers K1 through K4 refer to the buttons shown in that figure).

Table 7-2 Display Features

29.03.2010 12:59

heating relay

error

(E109)

2010-03-29 12:59

PM

Timer

On Off

Feature Item Function

D1 Display pane showing a permanent readout of the actual tem-

perature in the work space either in °C or °F (depending on the
user's preferences, see “Temperature Display Unit” on

page 7-32).

Alternatively, a flashing time entry prompt of the general format

hh:mm

place while the user is setting the oven's built-in clock.

D2 Four-line multifunctional display pane with fields for date and

time, a display area for the specific options of the selected menu
item, detailed alarm messages with alarm codes, progress indi­cators for continuous processes (for example, program-con­trolled temperature ramping), etc.

D3 Menu bar with iconized representations of adjustable parame-

ters. A red border is used to highlight the current menu item, as
selected using the

Right

(K4). Brief descriptions of the individual menu items are

given in table 7-3 below.

Note

If a menu item cannot be selected, then the function it
represents is not part of the equipment configuration of your
unit.

Handling and Control

(hours:minutes, both with two digits) appears in this

Menu

(K1) and arrow buttons

Left

(K2) and

D4 Status display area with three icons representing specific sta-

tuses of the oven (from left to right):

- The

Door Open

icon appears when the front door of the oven
is open or has not been closed correctly (see “Door Switch” on

page 4-15).

Note

The Door Open icon is only functional with OGH-S

Series, OMH-S Series and OMH floor stand devices.

- Upon occurrence of an error condition, the red alarm icon will
be illuminated. At the same time the current error code will flash
in the display pane D2. The alarm may be acknowledged by

pressing the button.

- The readiness indicator icon appears when the oven has been

D5

D6

switched off using the

page 7-1).

Settings pane labeled
or °F (depending on the user's preferences; see “Temperature

Display Unit” on page 7-32).

The left one of the two vertical bar graphs belongs to the
icon directly beneath it and displays the current fan speed level.
Bar graph for fan speed setting (in 5 steps: 1 – 5)

- level 1 (chevron 1 illuminated)

- level 2 (chevrons 1 and 2 illuminated)

- level 3 (chevrons 1 through 3 illuminated)

- level 4 (chevrons 1 through 4 illuminated)

- level 5 (chevrons 1 through 5 illuminated)

On/Off

Set

button (item K3 in figure 7-1 on

for temperature set value in either °C

Fan

Thermo Scientific Heratherm 7-3

Handling and Control

Table 7-2 Display Features

Feature Item Function

The table below contains brief descriptions of the menu bar icons.

.x

Table 7-3 Menu Bar Icons

Icon Function

D6 The right one of the two vertical bar graphs belongs to the

Damper icon directly beneath it and displays the current damper
position.
Bar graph for damper position (in 4 steps: 0 – 3)

- position 0 (damper closed - all chevrons extinguished)

- position 1 (chevrons 1 and 2 illuminated)

- position 2 (chevrons 1 through 4 illuminated) position

- position 3 (damper fully opened; chevrons 1 through 5 illumi­nated)

Temperature Set Value

Allows for changing the temperature set value within the permissible tem­perature range. The set value can be changed by pressing the

Right

(item K2 or K4) and you can, after confirming your changes with

the

Menu/Enter

button (item K1), track the impact on the actual temper-

Left

and

ature in the multifunctional display pane at D5.

Instructions: “Temperature Set Value” on page 7-7.

Timer

Allows for having the oven turn on or off upon expiry of a user-specified
countdown period or at a fixed on or off time, or having it operate on a
complete weekly schedule of daily on and off times. When the user
enables an “on timer” the oven is turned off. A rotating in the

Timer

icon
and the illuminated readiness indicator icon in the status display area
indicate that the timer is running.

Instructions: “Timer” on page 7-9.

Booster (only for table-top ovens)

A convenience feature designed to allow for speed-heating a cold and
empty unit spontaneously (requires a set temperature of at least
150 °C/302 °F).

Instructions: “Boost” on page 7-16.

Fan (OMS Series, OMH Series and OMH-S Series only)

Turns the fan on and allows for choosing the fan speed levels described
under D6. The current setting is shown by the bar graph located directly
above the icon and spelled out as a numeric value in the display pane at
D2.

Instructions: “Fan” on page 7-18.

Damper

Opens and closes the damper in graded steps. The current damper posi­tion is shown by the bar graph located directly above the icon and spelled
out as a percentage in the display pane at D2.

Instructions: “Damper” on page 7-22.

7-4 Heratherm Thermo Scientific

Table 7-3 Menu Bar Icons

Icon Function

Settings

Invokes a submenu with the following functions:

- Read access to error log

- Calibrating the oven

- Setting date and time

- Toggling the temperature display unit between °C and °F

- Setting preferences for user programs (program cycles / mode after
end)

- Selecting the timer mode of operation (countdown / fixed time of day /
weekday timer)

- Entering a configuration control code

(Instructions: “Settings” on page 7-24)

Program

Allows for launching, creating, deleting, copying, and editing user pro­grams.

(Instructions: “Programming” on page 7-38)

Handling and Control

Button Inactivity Monitoring

When no button is pressed for more than 30 seconds in any selected
menu item, the display exits from the selected screen and returns to
default display mode.

Thermo Scientific Heratherm 7-5

Handling and Control
Powering Up

Powering Up

1. Plug the power plug of the oven into a suitable protection-earthed AC power outlet.

In the display window on the front panel the readiness indicator icon (rightmost icon in
the status display area at D4 in figure 7-1 on page 7-1) is illuminated.

2. Keep the On/Off button depressed for two seconds.

An initialization routine will be run after the oven has been powered up. Once
initialization has been completed, the display will light up and the current work space
temperature will appear in the temperature display pane (item D1 in figure 7-1 on

page 7-1). The oven is ready for use now.

Switching the Oven Off / Powering Down

1. Keep the On/Off button depressed for two seconds.

The display window goes out, except for the readiness indicator icon (rightmost icon in
the status display area at D4 in figure 7-1 on page 7-1) and a residual heat temperature
readout in case the work space temperature is still higher than 50 °C/122 °F. The oven is
switched off now.

2. If required, unplug the AC power plug to power down the oven completely.

7-6 Heratherm Thermo Scientific

Handling and Control

Built-in heating and drying ovens Heratherm OGH,
OGH-S, OMH und OMH-S are to be operated up to a
working temperature of max. 250 °C (482 °F), only.

Temperature Set Value

Temperature Set Value

Heratherm ovens allow for setting the desired work space temperature directly using only a few
button presses. After confirming the new temperature set value in the settings pane Set (item
D5 in figure 7-1 on page 7-1), the user may trace the resulting temperature change in the
temperature display pane (item D1 in figure 7-1 on page 7-1).

You can also use the temperature set value to speed up cool-down subsequent to a drying or
heating process. Temperatures as low as ambient +10 °C can be selected, this requires open
damper and no additional heat in unit. You can set the oven to a set temperature of 0 °C (32
°F), though, to speed up cool-down. This is achieved in one single step, as described further
below.

Table 7-4 Adjusting the Temperature Set Value

Press to activate the menu bar, then use to

select the Temperature icon and press to confirm.

In the flashing settings pane Set, press or to

adjust a new temperature set value, then press to

confirm your settings.

The display returns to its default mode.

The actual temperature measured in the work space

and shown in the temperature display area starts to

change until it reaches the newly adjusted set value.

Thermo Scientific Heratherm 7-7

Handling and Control
Temperature Set Value

Table 7-5 Using the Temperature Set Value to Speed Up Cool-Down

At the end of the drying or heating process, press

to activate the menu bar, then use to select the

Temperature icon and press to confirm.

In the flashing settings pane Set, press to lower the

temperature set value to 50 °C (122 °F), then on to 0 °C

(32 °F) in one additional step. When the display reads

0 °C (32 °F), press to confirm your settings.

The display returns to its default mode.

The actual temperature measured in the work space

and shown in the temperature display area starts to

drop, showing the progress of the cool-down process.

7-8 Heratherm Thermo Scientific

Handling and Control

2010-04-12 10:14PM

Settings

Timer

2010-04-12 10:14PM

Settings

Timer

Count Down

Timer

The Timer feature from the menu bar enables the user to turn the oven on and off at
scheduled times. The timer supports three different modes of operation, depending on the
user's preferences:

• Countdown-type on or off timer: Turns the oven on or off after a user-specified period of

time. Instructions on setting the preferences for this option are given in table 7-6 below,
while its use as an off timer and on timer are described in table 7-7 on page 7-10 and

table 7-8 on page 7-10, respectively.

• Fixed-time on or off timer: Turns the oven on or off at a scheduled time. Instructions on

setting the preferences for this option are given in table 7-9 on page 7-11, while its use as
an off timer and on timer are described in table 7-10 on page 7-11 and table 7-11 on

page 7-12, respectively.

• Weekly timer: Turns the oven on or off at scheduled times on specific days of the week.

The process for setting the preferences for this option is described in table 7-12 on

page 7-12, while instructions for programming the daily turn-on and turn-off times are

given in table 7-13 on page 7-13.

Timer

Programming a turn-on time causes the oven to shut down until it is scheduled to restart,
while a turn-off time keeps it running before it shuts down at the user-specified time. The
timer starts running immediately as soon as the user confirms his or her entries.

Pre-programmed routines (user programs, decontamination) override timer schedules. A timer
will not start before a concurring program has finished execution.

Table 7-6 Presetting the Countdown Timer Mode of Operation

Press to activate the menu bar, then use to

select the Settings icon and press to confirm.

Press to switch to the Timer menu item and

confirm the selection with .

Press or to preselect the Countdown timer

as the mode of your choice, then use to confirm

the selection.

Thermo Scientific Heratherm 7-9

The display returns to its default mode.

Handling and Control

2010-03-29 12:59PM

Timer

On Off

2010-03-29 1:05PM

Off-Timer

00:00

2010-03-29 12:59PM

Timer

On Off

2010-03-29 1:05PM

On-Timer

00:00

Timer

Table 7-7 Setting a Countdown-type Off Timer

Press to activate the menu bar, then use to

select the Timer icon and press to confirm.

Press to select the off timer option Off.

Set the hours and minutes until the oven is supposed to

shut down by pressing or , then press to

confirm.

The display returns to its default mode.

In the menu bar, the Timer icon is illuminated and a is

rotating on the icon's face.

.

Table 7-8 Setting a Countdown-type On Timer

Press to activate the menu bar, then use to

select the Timer icon and press to confirm.

Press to select the on timer option On, then

to confirm.

Set the hours and minutes until the oven is supposed to

turn on by pressing or , then press to

confirm.

The oven switches off.

The display goes out, the Timer icon is illuminated in

7-10 Heratherm Thermo Scientific

the menu bar with a hand rotating on its face.

Additionally, the readiness indicator icon is illuminated.

Handling and Control

2010-04-12 10:14PM

Settings

Timer

2010-04-12 10:14PM

Settings

Timer

Absolute

2010-03-29 12:59PM

Timer

On Off

2010-03-29 1:05PM

Off-Timer

2010-03-29 1:05PM

Timer

Setting a Fixed-time On or Off Timer

.

Table 7-9 Presetting the “Fixed-time” Timer Mode of Operation

Press to activate the menu bar, then use to

select the Settings icon and press to confirm.

Press to switch to the Timer menu item and

confirm the selection with .

Press or to preselect the Absolute fixed-time

timer as the mode of your choice, then to confirm

the selection.

The display returns to its default mode.

Table 7-10 Setting a Fixed-time Off Timer

Press to activate the menu bar, then use to

select the Timer icon and press to confirm.

Press to select the off timer option Off.

Set year, month, day, hours and minutes using

or , followed by to confirm.

In the menu bar, the Timer icon is illuminated and a is

rotating on the icon's face.

Thermo Scientific Heratherm 7-11

Handling and Control

2010-03-29 12:59PM

Timer

On Off

2010-03-29 1:05PM

On-Timer

2010-03-29 1:05PM

2010-04-12 10:14PM

Settings

Timer

2010-04-12 10:14PM

Settings

Timer

Weekly

Timer

Table 7-11 Setting a Fixed-time On Timer

Press to activate the menu bar, then use to

select the Timer icon and press to confirm.

Press to select the on timer option On, then

to confirm.

Set year, month, day, hours and minutes using or

, followed by to confirm.

The oven switches off.

Setting a Weekly Timer

Table 7-12 Presetting the Weekly Timer Mode of Operation

The display goes out, the Timer icon is illuminated in

the menu bar with a hand rotating on its face, and the

readiness indicator icon is illuminated additionally.

Press to activate the menu bar, then use to

select the Settings icon and press to confirm.

Press to switch to the Timer menu item and

confirm the selection with .

Press or to preselect the Weekly timer as the

mode of your choice, then to confirm the selection.

7-12 Heratherm Thermo Scientific

The display returns to its default mode.

Table 7-13 Setting a Weekly Timer

2010-03-29 12:59PM

Timer

On

2010-03-29 12:59PM

Timer

Edit

2010-03-29 1:05PM

Off-Timer

2010-03-29 1:05PM

2010-03-29 12:59PM

Monday

On: 08:00

AM

Off: 06:00PM

2010-03-29 1:05PM

Off-Timer

2010-03-29 1:05PM

2010-03-29 12:59PM

Sunday

On: --:--AM

Off: --:--PM

Press to activate the menu bar, then use to

select the Timer icon and press to confirm.

In the selection screen shown at left, press to

switch from On to the Edit option.

Select the Edit option by pressing .

Press to select the “on time” for Monday, which

Handling and Control

Timer

should start flashing when selected (or continue to the

desired weekday by pressing , which will cause the

“on time” of that day to start flashing).

Press or to set the hours, then continue to

minutes by pressing .

Use or to set the minutes, then continue to

Tuesday or any other desired weekday by pressing

.

To prevent the oven from turning on and back off on a

specific day, set both hours and minutes to --:--.

Set the scheduled turn-on and turn-off times for each

single day of the week all the way to Sunday and press

. (The turn-on and turn-off times for Saturday and

Sunday are disabled by default.)

Thermo Scientific Heratherm 7-13

If there is no need to set or change the turn-on and/or

turn-off times for a specific weekday, press and

or to go back and forth to the previous and

next day, respectively.

Handling and Control

2010-03-29 12:59PM

Save ?

No Yes

2010-03-29 12:59PM

Timer

On

2010-03-29 1:12PM

Stop Timer ?

No Yes

Timer

Table 7-13 Setting a Weekly Timer

When prompted to save your changes, press to

confirm.

Stopping a Timer

Table 7-14 Stopping an Off Timer Before It Expires

Note

This prompt for saving also appears when you press
the button while working on the weekly timer's
settings.

To enable the weekly timer press .

Alternatively, press and to select the Off

option if the weekly timer you have just saved should be

activated at a later date.

If you have chosen to enable the weekly timer

immediately, the Timer icon is illuminated in the menu

bar and a hand is rotating on the icon's face.

Press to activate the menu bar, then use to

select the Timer icon and press to confirm.

Press to confirm the Yes default selection.

In the menu bar, the Timer icon will go out.

The display returns to its default mode.

Table 7-15 Stopping an On Timer Before It Expires

To cancel a pre-programmed on timer while the oven is

switched off, hold the On/Off button depressed for a

few seconds.

7-14 Heratherm Thermo Scientific

Table 7-15 Stopping an On Timer Before It Expires

2010-03-29 1:12PM

Stop Timer ?

No Yes

2010-03-29 12:59PM

Timer

On

2010-03-29 12:59PM

Timer

Off

2010-03-29 4:05PM

Timer stopped!

In the Stop Timer? prompt that appears, confirm the

default selection Yes by pressing .

In the menu bar, the Timer icon will go out.

The display returns to its default mode.

Table 7-16 Stopping a Weekly Timer Before It Expires

Press to activate the menu bar, then use to

select the Timer icon and press to confirm.

The flashing word On appears in the multifunctional

Handling and Control

Timer

display pane.

Press to switch to Off state, then press to

confirm.

The message Timer stopped appears as a confirmation.

In the menu bar, the Timer icon will go out.

The display returns to its default mode.

Thermo Scientific Heratherm 7-15

Handling and Control

2010-03-31 1:34PM

Timer

On Off

2010-03-31 1:34PM

Timer

On

Boost

Boost

The boost feature (only for table-top ovens) allows for speed-preheating a cold, empty oven
to a previously adjusted temperature set value (see “Temperature Set Value” on page 7-7) of
at least 150 °C (302 °F). In boost mode, the oven‘s heaters work at their full capacity to
approximate the set temperature as fast as possible. This feature may disable overheat
protection for up to 30 minutes and allow the heater to work with temporary peak
temperatures. Once the preset temperature has been reached, the unit is restored to normal
temperature control, and the user may proceed to loading the oven with the samples.

Risk of damage to samples!

Be sure to remove the material to be dried and all other
temperature-sensitive items from the oven’s workspace before speed-heating
the oven. High temperatures which could possibly damage the samples may
temporarily prevail in the work space once the oven has been speed-heated
using the boost feature.

Table 7-17 Turning Boost On

Set the temperature set value to at least 150 °C/302 °F

(see “Temperature Set Value” on page 7-9).

Press to activate the menu bar, then use to

select the Boost icon and press to confirm.

In the selection screen that appears, confirm the

preselected option On by pressing .

The selected option On remains in the display pane for

a few seconds to let you track your action.

7-16 Heratherm Thermo Scientific

Table 7-17 Turning Boost On

2010-03-31 1:34PM

Timer

On Off

2010-03-31 1:35PM

Timer

Off

The display returns to its default mode.

The Boost icon in the menu bar is illuminated to indicate

that boost mode has been activated.

Once the preset temperature set value has been

reached, the boost heater turns off automatically, and

the Boost icon goes out.

Risk of burns! Depending on the chosen

temperature set value, high temperatures may

prevail in the work space once the oven has been

speed-heated using the boost feature.

To avoid the risk of injury, users must wear

protective gloves or other suitable personal

Handling and Control

Boost

protection equipment when loading the work space

of the oven!

Table 7-18 Turning boost off prematurely

Press to activate the menu bar, then use to

select the Boost icon and press to confirm.

In the selection screen that appears, confirm the

preselected option Off by pressing .

The selected option Off remains in the display pane for

a few seconds to let you track your action.

The display returns to its default mode.

The Boost icon in the menu bar is extinguished to

Thermo Scientific Heratherm 7-17

indicate that boost mode has been turned off.

Handling and Control

31.03.2010 14:15

20%

Fan

Fan

This menu item allows for turning on the fan in the work space and simultaneously
gradually adjusting the speed of the fan. The current setting of the fan is indicated by the
illuminated Fan icon in the menu bar and the five-level bar graph (see item D6 in figure 7-1
on page 7-1) for the fan speed setting located directly above the icon.

Table-top ovens

The unit contains a regulated fan; fan speed can be lowered (adjusted) in 5 stages:

• 20% (1 chevron illuminated)

• 40% (2 chevrons illuminated)

• 60% (3 chevrons illuminated)

• 80% (4 chevrons illuminated)

• 100% (5 chevrons illuminated)

To protect the oven from overheating, however, the built-in controller may override the
user’s setting and increase the fan speed automatically when the work space temperature rises
above the set value. A fan error will occur on a loss of speed.

Table 7-19 Turning on the Fan

Press to activate the menu bar, then use or

to select the Fan icon and press to confirm.

The settings dialog shown at the left appears in the

multifunctional display pane now, with the value 20%

flashing.

7-18 Heratherm Thermo Scientific

Table 7-19 Turning on the Fan

31.03.2010 14:15

80%

31.03.2010 14:15

100%

31.03.2010 14:15

20%

31.03.2010 14:15

80%

Keep this setting or press as often as needed to

accomplish the desired fan level, then press to

confirm.

The multifunctional display pane will show the current

fan speed level as a percentage (20%, 40%, 60%,

80% or 100%). Additionally, the matching number of

chevrons will be illuminated in the bar graph to the

right.

The display returns to its default mode.

The Fan icon in the menu bar is illuminated now to

indicate that the fan is running.

Handling and Control

Table-top ovens

Table 7-20 Adjusting Fan Speed

Press to activate the menu bar, then use or

to select the Fan icon and press to confirm.

The settings dialog shown at left appears in the

multifunctional display pane now, with the current fan

speed setting flashing already.

Change fan speed with or , then press to

confirm.

Thermo Scientific Heratherm 7-19

Handling and Control
Floor stand ovens

Table 7-20 Adjusting Fan Speed

If the

Heater prot.

off the fan or reduce its speed:

OMH Series and OMH-S Series ovens employ forced
ventilation, that is, the fan cannot be turned off completely and
will run at a variable minimum speed when a certain
temperature limit is exceeded. Any attempt to return the fan
speed level to 0% will be denied, as indicated by the message

heater prot

Likewise, the heater prot. message may appear upon the first
press of the button or any subsequent step when you try to
reduce fan speed. This indicates that the overheat protection
feature has taken over fan control, regulating fan speed
automatically to a safe level that rules out any thermal damage
to the oven‘s heating circuits.

in the multifunctional display pane.

message appears when you try to turn

Floor stand ovens

The unit contains a regulated fan; fan speed can be lowered (adjusted) in 2 stages:

Minimum fan speed (chevrons 1 through 3 illuminated)

Maximum fan speed (chevrons 1 through 5 illuminated)

M

Table 7-21 Turning on the Fan

In either case, fan speed control is restricted to the speed level
admitted by the controller or remains disabled altogether until
the workspace temperature has returned to a safe level.

The display returns to its default mode.

The Fan icon remains illuminated in the menu bar.

Press to activate the menu bar, then use or

to select the Fan icon and press to confirm.

The settings dialog shown at left appears in the

multifunctional display pane now, with the current fan

speed setting flashing already.

7-20 Heratherm Thermo Scientific

Table 7-21 Turning on the Fan

Press as often as needed to accomplish the 2. fan

level, then press to confirm.

The multifunctional display pane will show the current

fan speed level as a percentage (60% or 100%).

Additionally, the matching number of chevrons will be

illuminated in the bar graph to the right.

The display returns to its default mode.

The Fan icon in the menu bar is illuminated now to

indicate that the fan is running.

Table 7-22 Adjusting the Fan (only table-top ovens)

Handling and Control

Floor stand ovens

Press to activate the menu bar, then use or

to select the Fan icon an press to confirm.

The settings dialog shown at left appears in the

multifunctional display pane now, with the current fan

speed setting flashing already.

Change fan speed with or , then press to

confirm.

The display returns to its default mode.

The fan continues to run until the unit is switched off.

Thermo Scientific Heratherm 7-21

Handling and Control

10.04.2010 14:37

0

2010-04-10 2:37PM

1

10.04.2010 14:37

3

Damper

Damper

This menu item allows for gradually opening and closing the damper that vents the oven's
work space. The current status of the damper will be indicated by illumination of the
Damper icon in the menu bar and the four-level bar graph (see item D6 in figure 7-1 on

page 7-1) for the damper's angular position, located directly above the icon. The damper can

be adjusted in 4 steps:

• Position 0: damper closed - all chevrons extinguished

• Position 1: chevrons 1 and 2 illuminated

• Position 2: chevrons 1 and 4 illuminated

• Position 3: damper fully opened; chevrons 1 through 5 illuminated

Table 7-23 Opening the Damper

Press to activate the menu bar, then use or

to select the Damper icon and press to

confirm.

The settings dialog shown at left appears in the

multifunctional display pane, with the starting value 0

flashing.

Press as often as needed to accomplish the

desired damper setting, then confirm with .

The multifunctional display pane will show the current

damper setting as a numerical value between 0 and 3.

Additionally, the matching number of chevrons will be

illuminated in the bar graph to the right.

The display returns to its default mode.

7-22 Heratherm Thermo Scientific

The Damper icon in the menu bar is illuminated to

indicate that the damper has been opened and how far.

Table 7-24 Adjusting the Damper Position or Closing the Damper

10.04.2010 14:37

3

2010-04-10 2:37PM

1

10.04.2010 14:37

0

Press to activate the menu bar, then use or

to select the Damper icon and press to

confirm.

The settings dialog shown at left appears in the

multifunctional display pane, with the current damper

position flashing.

Use or to change the damper position, then

confirm with .

Handling and Control

Damper

To close, set the damper position to 0 using , then

confirm with .

The display returns to its default mode.

If you have just readjusted the damper position, the

Damper icon will remain illuminated in the menu bar.

Should you have chosen to turn close the damper

altogether, the Damper icon in the menu bar will be

extinguished.

Thermo Scientific Heratherm 7-23

Handling and Control

2010-04-06 1:33PM

Settings

Error

2010-04-06 1:36PM

Error 0

2010-04-06 1:31PM

Fan Error (E009)

Settings

Settings

The Settings menu item opens a submenu populated with various commands for viewing
general status information on the unit and setting preferences for the operation of the oven
or its display window:

• Read access to error log

• Calibrating the oven

• Setting date and time

• Toggling the temperature display unit between °C and °F

• Toggling process protection on and off

• Setting preferences for user programs (program cycles / mode after end)

• Selecting the timer mode of operation (countdown / fixed time of day / weekday timer)

• Entering a configuration control code

Instructions for using these features are given in the following.

Error Log

Users calling customer service for support may be asked by the agent to supply information
from the error log of the oven.This internal memory may be accessed by choosing the
Settings -> Error menu item It enables the user to browse through the most recent 22
alarm messages that were caused by hardware or control loop errors. Each error is displayed
with the date and time of its occurrence, a brief clear text description and an internal error
code.

Error codes and instructions for clearing alarm conditions appear in the section “Error

Codes” on page 12-1.

Table 7-25 Reading the Error Log

Press to activate the menu bar, then use or

to select the Settings icon and press to

confirm.

Press to select the Error item from the Settings

submenu.

7-24 Heratherm Thermo Scientific

The first entry of the error log is displayed, numbered

“0.” This entry represents the most recently registered

error.

Calibration

2010-04-06 1:37PM

Error 1

2010-04-06 1:34PM

Heat Relay (E109)

Handling and Control

Settings

Table 7-25 Reading the Error Log

Press to go to the next entry (or to go back to

the previous one).

After the entry numbered 21 the display wraps and

returns to the beginning of the error log, displaying

entry “Error 0.”

To exit from the error log and return to normal display

mode press twice.

The Settings icon in the menu bar will go out.

The Settings -> Calibration menu item enables the user to initiate a temperature calibration
routine for the built-in temperature sensors and choose whether calibration should be
accomplished manually or automatically:

• The Manual option allows for entering an absolute temperature directly, as measured - for
example, using an external reference sensor.

• The Eco function (optional) is required for using the Eco convenience program. It
computes the spatial temperature difference between the temperature prevailing at the
location of the sample (as measured by the sample sensor; accessory part to be ordered
separately) and the current workspace temperature (as measured by the built-in sensor of
the oven). The built-in controller uses the result to compute a temperature limit that
marks the end of the drying process. The temperature preset on the oven during the Eco
calibration process must be equal to the ultimate temperature set value for the drying
process. The Eco convenience program and its use are described in more detail in the
section “ECO Convenience Program (only for table-top ovens)” on page 7-38.

• The Sample function (optional) allows for a thermal calibration of a sample sensor
(accessory to be ordered separately) connected to the oven by direct entry of an absolute
value measured using an external temperature measuring device.

Calibration Prerequisites

Maintain the ambient conditions within the specified limits of the oven
and make sure that the damper is fully closed before launching
calibration.

Thermo Scientific Heratherm 7-25

Varying ambient conditions and/or an open damper may impact the
result of the calibration routine, which may lead to misadjustment of
the controller and unreliable temperature control operation.

Handling and Control

2010-04-06 1:33PM

Settings

Error

2010-04-06 1:33PM

Settings

Calibration

2010-04-06 1:33PM

Settings

Calibration

Manual

2010-04-06 1:33PM

Settings

Calibration

36.9°C

Settings

Table 7-26 Entering the Calibration Reference Temperature Manually

Press to activate the menu bar, then use or

to select the Settings icon and press to

confirm.

The Error menu item from the Settings submenu

appears in the multifunctional display pane.

Press to switch to the Calibration menu item and

confirm the selection with .

In the Calibration selection screen, press to

choose the preselected option Manual.

In the settings dialog that appears, set the temperature

measured with the external reference sensor by using

or and confirm the settings with .

The newly entered value will be stored and used to

calibrate the internal temperature sensors with the

value measured by the reference sensor.

The display returns to its default mode.

The Settings icon in the menu bar will go out.

Table 7-27 ECO Temperature Calibration (only for table-top ovens)

Place the temperature sensor at the location where the

sample is to be placed. Route the sensor lead through

7-26 Heratherm Thermo Scientific

the tube access port in the back wall of the oven and

plug it into the connect on the device’s back panel.

Press to activate the menu bar, then use or

to select the Settings icon and press to

confirm.

Table 7-27 ECO Temperature Calibration (only for table-top ovens)

2010-04-06 1:33PM

Settings

Error

2010-04-06 1:33PM

Settings

Calibration

2010-04-06 1:33PM

Settings

Calibration

Eco

2010-04-06 1:33PM

Calibration

Eco

On

2010-04-06 1:33PM

Calibration

Auto

On

2010-04-06 1:33PM

Calibration

Eco

Off

2010-04-06 1:35PM

Eco Calib. Running

The Error menu item from the Settings submenu

appears in the multifunctional display pane.

Press to switch to the Calibration menu item and

confirm the selection with .

In the Calibration selection screen, press to

choose the Eco option and confirm the selection with

.

The current operating status appears in the display

Handling and Control

Settings

pane, represented by the flashing word Off.

Press to switch to On state, then to confirm.

The selected option On remains in the display pane for

a few seconds to let you track your action.

The confirmation message Eco Calib. Running appears

in the multifunctional display pane to indicate that

automatic calibration is running.

The Settings icon in the menu bar will go out.

Once the calibration process has been accomplished,

the display returns to its default mode.

Thermo Scientific Heratherm 7-27

Handling and Control

2010-04-06 1:33PM

Settings

Error

2010-04-06 1:33PM

Settings

Calibration

2010-04-06 1:33PM

Settings

Calibration

Sample

2010-04-06 1:33PM

Settings

Calibration

36.9°C

Settings

Table 7-28 Entering the Calibration Reference Temperature for the Sample Sensor

Manually

Place the sample sensor at the location where the

sample is to be placed. Route the sensor lead through

the tube access port to an external temperature

measuring device.

Power up the measuring device and wait until the

sample sensor has stabilized and provides a constant

temperature reading.

Press to activate the menu bar, then use or

to select the Settings icon and press to

confirm.

The Error menu item from the Settings submenu

appears in the multifunctional display pane.

Press to switch to the Calibration menu item and

confirm the selection with .

In the Calibration selection screen, press to

choose the Sample option.

In the settings dialog that appears, set the temperature

measured with the external reference sensor by using

or and confirm the settings with .

The newly entered value will be stored and used to

7-28 Heratherm Thermo Scientific

calibrate the built-in controller to the absolute value

measured by the sample sensor.

The display returns to its default mode.

The Settings icon in the menu bar will go out.