Thermo Drying cabinet Heratherm™ Advanced Protocol with air-circulation fan, 97 l, OMH100 User guide

©

2011 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 Fisher Scientific.
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 Electron LED GmbH
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.

ii Heratherm Thermo Scientific

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.................................................................................................................................. 1-6

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

Intermediate Storage........................................................................................................................... 3-2

Room Ventilation............................................................................................................................... 3-2

Use with Air Exhaust Systems............................................................................................................. 3-2

Space Requirements............................................................................................................................ 3-3

Transport ........................................................................................................................................... 3-4

Stacking Kit........................................................................................................................................ 3-5

Installing the Stacking Feet................................................................................................................. 3-5

Installing the Stacking Adapter........................................................................................................... 3-6

Installing the Anti-tilt Anchor ............................................................................................................ 3-6

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

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

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

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

Heratherm OMH-S Series Oven Overview ........................................................................................ 4-7

Safety Devices................................................................................................................................... 4-10

Operating Environment ................................................................................................................... 4-10

Door switch...................................................................................................................................... 4-10

Sensing and Control System............................................................................................................. 4-10

Data Communications & Alarm Interface........................................................................................ 4-11

RS 232 interface ........................................................................................................................... 4-11

Thermo Scientific Heratherm i

Contents

Alarm contact ............................................................................................................................... 4-12

AC Power Socket.......................................................................................................................... 4-12

Fuses............................................................................................................................................. 4-12

Work Space Components................................................................................................................. 4-12

Inner Chamber............................................................................................................................. 4-12

Product Options............................................................................................................................... 4-14

Door Fitted with Viewing Windows and Workspace Lighting ......................................................... 4-14

Tube Access Ports............................................................................................................................. 4-15

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

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

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

Installing the Shelving ........................................................................................................................ 5-1

Preparing the Work Space .................................................................................................................. 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

Installing the Shelf Support Brackets .............................................................................................. 5-6

Installing the Wire-mesh Shelves .................................................................................................... 5-7

Levelling the Oven ......................................................................................................................... 5-7

Connecting Power.............................................................................................................................. 5-8

Connection to the Power Supply Source......................................................................................... 5-8

Connecting the RS-232 Interface ....................................................................................................... 5-9

Interconnecting the Oven with a Computer ................................................................................... 5-9

Wiring the Alarm Contact................................................................................................................ 5-11

Functional Description................................................................................................................. 5-11

Alarm Relay Specifications............................................................................................................ 5-12

Connection Example .................................................................................................................... 5-12

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

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

Timer ................................................................................................................................................. 7-8

Setting a Fixed-time On or Off Timer.......................................................................................... 7-10

Setting a Weekly Timer................................................................................................................ 7-11

Stopping a Timer.......................................................................................................................... 7-13

Light................................................................................................................................................. 7-15

Boost ................................................................................................................................................ 7-17

Fan ................................................................................................................................................... 7-19

Damper ............................................................................................................................................ 7-21

Settings............................................................................................................................................. 7-23

Error Log...................................................................................................................................... 7-23

Calibration ................................................................................................................................... 7-24

Date and Time ............................................................................................................................. 7-28

Temperature Display Unit............................................................................................................ 7-31

ii Heratherm Thermo Scientific

Contents

Process Protection .........................................................................................................................7-32

Program Preferences ......................................................................................................................7-33

Configuration................................................................................................................................7-35

Programming ....................................................................................................................................7-37

End of Program.............................................................................................................................7-37

ECO Convenience Program..........................................................................................................7-37

Instructions ...................................................................................................................................7-39

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

WEEE Conformity ...........................................................................................................................11-2

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

Thermo Scientific Heratherm iii

Contents

iv Heratherm Thermo Scientific

L

List of Figures

Figure 3-1 Oven Dimensions and Required Clearance........................................................................................... 3-3

Figure 3-2 Lift Points............................................................................................................................................. 3-4

Figure 4-1 Heratherm OGH Series Front View ..................................................................................................... 4-2

Figure 4-2 Heratherm OGH 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 Series Front View .................................................................................................... 4-6

Figure 4-6 Heratherm OMH Series Rear View...................................................................................................... 4-7

Figure 4-7 Heratherm OMH-S Front View........................................................................................................... 4-8

Figure 4-8 Heratherm OMH-S Rear View............................................................................................................. 4-9

Figure 4-9 Sensor Mounting Location - OGH Series............................................................................................. 4-10

Figure 4-10 Sensor Mounting Location - OMH Series .......................................................................................... 4-11

Figure 4-11 Signal Interfaces and Power Socket ..................................................................................................... 4-12

Figure 4-12 Shelf System - OGH Series and OGH-S Series Oven ......................................................................... 4-13

Figure 4-13 Shelf System - OMH Series and OMH-S Series Oven........................................................................ 4-14

Figure 4-14 Viewing Package Front View .............................................................................................................. 4-15

Figure 4-15 Tube Access Ports............................................................................................................................... 4-16

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 Shelf Support Bracket Installation ........................................................................................................ 5-7

Figure 5-10 Wire-mesh shelf.................................................................................................................................. 5-7

Figure 5-11 AC Power Supply Socket.................................................................................................................... 5-9

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

Thermo Scientific Heratherm i

List of Figures

ii Heratherm Thermo Scientific

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.

1

• 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 Scientific Heratherm 1-1

Safety Notes
Warranty

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 Scientific 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 Scientific

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 Scientific 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!

1-4 Heratherm Thermo Scientific

Symbols on the Oven

Observe operating instructions

VDE test mark

CE-conformity mark: confirms conformity according to EU Guidelines

RS 232 interface

Safety Notes

Intended Purpose of the Oven

PT 100 Sample Sensor - accessory part

Alarm contact

Intended Purpose of the Oven

Correct use

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), 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.

Thermo Scientific Heratherm 1-5

Safety Notes
Standards and Directives

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;

• 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 Scientific

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)

2

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.

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.

Risk of injury

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 0 2

Shelf support 4 4

Power cord 1 1

Connector, potential-free contact 1 1

Clip springs 0 2

Operating manual 1 1

Short reference guide 1 1

2-2 Heratherm Thermo Scientific

Inst allation

Ambient Conditions

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

Location Requirements

• Draft-free and dry indoor location.

• Dust loading should be in keeping with the degree of contamination, which is Pollution
Degree 2 according to IEC EN 61010-1. Using the oven in an atmosphere with
electrically conductive dust is prohibited.

3

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

“Space Requirements” on page 3-3.

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

• 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.

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

• Condensation must be avoided - for example, after moving or transporting the device.
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.

Thermo Scientific Heratherm 3-1

Installation
Intermediate Storage

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

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.

• 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.

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.

3-2 Heratherm Thermo Scientific

Space Requirements

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

The specified side clearances represent minimum distances.

Installation

Space Requirements

Figure 3-1 Oven Dimensions and Required Clearance
Table 3-1 Heratherm Oven Dimensions

Type

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.

Thermo Scientific Heratherm 3-3

Installation
Transport

Table 3-2 Required Clearances

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

Transport

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

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

Figure 3-2 Lift Points

Heavy loads! Lift with care!

T o avoid injury through physical strain,
such as strain traumata and slipped discs, do not attempt to lift the
oven alone!
T o avoid injury through dropped loads, be sure to wear Personal Pro­tection Equipment, such as safety shoes, when lifting the oven.
T o 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.

3-4 Heratherm Thermo Scientific

Stacking Kit

Material Number Description

Installation

Stacking Kit

50126665

50126666

50126667

Stacking adapter Heratherm 60L

Stacking adapter Heratherm 100L

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

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

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

Thermo Scientific Heratherm 3-5

Installation
Installing the Anti-tilt Anchor

Installing the Stacking Adapter

1

Stacking adapter Heratherm 60L

2

Stacking adapter Heratherm 100L

3

Stacking adapter Heratherm 180L

4

Anti-tilt anchor

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

• for 60/60/100 on 180 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.

Installing the Anti-tilt Anchor

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.

3-6 Heratherm Thermo Scientific

Installation

Installing the Anti-tilt Anchor

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 (see figure).

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.

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.

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

Thermo Scientific Heratherm 3-7

Installation
Installing the Anti-tilt Anchor

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

Y ou should be aware at all times that st acked 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.

3-8 Heratherm Thermo Scientific

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 natural convection ovens come
equipped with the features also found in OGH Series devices, including (see “Heratherm

OGH-S Series Oven Overview” on page 4-3):

• Heratherm OMH Series (OMH is brief for Oven with Mechanical convection) advanced
protocol fan convection ovens come equipped with the following features (see “Heratherm

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

4

• Heratherm OMH-S Series advanced protocol fan convection ovens come equipped with
the following features (see “Heratherm OMH-S Series Oven Overview” on page 4-7):

Heratherm OGH Series Oven Overview

Heratherm OGH Series (OGH is brief for Oven with Gravity convection) advanced protocol
natural 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 figure 4-3 and figure 4-4 below.

Figure 4-1 Heratherm OGH 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 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;

• 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 figure 4-5 and figure 4-6 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;

• 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;

Thermo Scientific Heratherm 4-5

Product Description
Heratherm OMH Series Oven Overview

The individual features of OMH Series ovens are shown in figure 4-9 and figure 4-10 below.

Figure 4-5 Heratherm OMH 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-S Series Oven Overview

Figure 4-6 Heratherm OMH 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] Fan
[9] Air inlet flap, with electrical drive
[10] ­[11] Electronics compartment
[12] Levelling foot

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:

Thermo Scientific Heratherm 4-7

Product Description
Heratherm OMH-S Series Oven Overview

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

• 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)

The individual features of OMH-S Series ovens are shown in figure 4-11 and figure 4-12 below.

Figure 4-7 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

4-8 Heratherm Thermo Scientific

Product Description

Heratherm OMH-S Series Oven Overview

Figure 4-8 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] Fan
[9] Air inlet flap, with electrical drive
[10] ­[11] Electronics compartment
[12] Levelling foot
[13] Sample sensor connection

Thermo Scientific Heratherm 4-9

Product Description
Safety Devices

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.

Door switch

Heratherm OGH 60/100/180-S and Heratherm OMH 60/100/180-S 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.

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 4-9 Sensor Mounting Location - OGH Series

4-10 Heratherm Thermo Scientific

Product Description

Data Communications & Alarm Interface

Figure 4-10 Sensor Mounting Location - OMH Series

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 4-11 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.).

Thermo Scientific Heratherm 4-11

Product Description
Work Space Components

Figure 4-11 Signal Interfaces and Power Socket

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 5-11). For this purpose, the devices come with a

pre-wired potential-free alarm contact (see figure 4-11). 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 device is connected to the AC supply mains via an IEC socket, which accepts a power
cord with an IEC standard plug (see figure 4-11).

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.

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

Inner Chamber

Fuse replacement

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.

4-12 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, side
[3] Support rail for wire mesh shelf
[4] Wire-mesh shelf
[5] Air baffle, bottom

Figure 4-12 Shelf System - OGH Series and OGH-S Series Oven

Thermo Scientific Heratherm 4-13

Product Description
Product Options

[1] Retaining spring
[2] Air baffle, rear
[3] Support rail for wire mesh shelf
[4] Wire-mesh shelves,
[5] Support rail

Figure 4-13 Shelf System - OMH Series and OMH-S Series Oven

Product Options

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

Door Fitted with Viewing Windows and W orkspace 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. Use it for
brief visual checks of the device‘s interior only. The View Package limits the operating
temperature range of the heating and drying oven to 250 °C (482 °F).

Instructions for turning the workspace lighting on and off can be taken from the section

“Light” on page 7-15.

4-14 Heratherm Thermo Scientific

Product Description

Tube Access Ports

1

2

6

5

4

Figure 4-14 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

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

Side Panel Mounted
Port, dia. in mm

3

Top Panel Mounted
Port, dia. in mm

OMH and OMH-S 24 or 58 24 or 58

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

figure 4-15).

Thermo Scientific Heratherm 4-15

Product Description
Tube Access Ports

Figure 4-15 Tube Access Ports

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

1

3

2

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.

4-16 Heratherm Thermo Scientific

Start-up

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.

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.

5

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

• Peel off the protective foil from the support rails.

• 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

Installing the Shelving

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

Thermo Scientific Heratherm 5-1

Start-up
Initial installation

[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 Scientific

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 and Disinfection” on page 9-1.

Preparing the Work Space

Cleaning and disinfection

Start-up

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.

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].

Thermo Scientific Heratherm 5-3

Start-up
Preparing the Work Space

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 Uninst alling 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 Scientific

Start-up

Preparing the Work Space

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

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

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 Scientific 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].

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.

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

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.

5-6 Heratherm Thermo Scientific

Figure 5-9 Shelf Support Bracket Installation

Start-up

Preparing the Work Space

Installing the Wire-mesh Shelves

Figure 5-10 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.

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.

Levelling the Oven

1. Position a bubble level onto the center shelf.

Thermo Scientific Heratherm 5-7

Start-up
Connecting Power

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.

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:

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!

• T 16 A slow-blow fusing

• B 16 circuit breaker

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.

5-8 Heratherm Thermo Scientific

Start-up

Connecting the RS-232 Interface

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] IEC power socket

Figure 5-11 AC Power Supply Socket

the first time allow some time for stabilization before switching on to
avoid condensation forming on live parts.

Connecting the RS-232 Interface

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.

Condensation

When taking the oven into operation for

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.

Thermo Scientific Heratherm 5-9

Start-up
Connecting the RS-232 Interface

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 “RS 232 interface” on page 4-11).

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 5-1 below, depending on what
type of information you want to query.

Command Syntax Rules

Be sure to enter the commands exactly as shown in the examples
in table 5-1 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;

— 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;

5-10 Heratherm Thermo Scientific

Wiring the Alarm Contact

— 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 5-1 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

Start-up

?: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.

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!

Time

T1 T2 T3 T4

Skilled work

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.

Thermo Scientific Heratherm 5-11

Start-up
Wiring the Alarm Contact

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

Alarm Relay Specifications

Switching behavior

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.

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 serial interface 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.

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.

5-12 Heratherm Thermo Scientific

Start-up

Wiring the Alarm Contact

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 Scientific Heratherm 5-13

Start-up
Wiring the Alarm Contact

5-14 Heratherm Thermo Scientific

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.

6

• The shelving components must be installed safely.

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 1-6

• 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

Hot surfaces

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!

Risk of overloading

Overloading may damage the
wire-mesh shelves or cause the shelves and/or the oven to tilt
when the shelves are being drawn out, ultimately destroying the
samples. T o avoid overloadi ng the oven or it s wire-mesh shelving
be sure to observe the sample weight limits specified in section

“Technical Data” on page 13-1.

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

Handling and Control

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,
Heratherm OGH 60/100/180-S, and Heratherm OMH 60/100/180-S control panel with all
of its visualization elements and controls.

7

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

Series and OMH-S Series Ovens

D1

D2

D3
K1
K2

K3

16.04.2010 13:33

Timer

On Off

D4
D5

D6

K4
K5

The table below contains brief descriptions of the buttons on the control panel (items K2
through K5 in figure 7-1).

Thermo Scientific Heratherm 7-1

Handling and Control

Table 7-1 Control Buttons

Icon Item Function

K1

K2 Left button

K3 On/Off button

K4 Right

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.

After the first press of 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

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).

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
the timer to

Off state of

On.

On state of

Off.

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.

7-2 Heratherm Thermo Scientific

button

Handling and Control

The table below contains brief descriptions of the display features of the control panel (items
D1 through D6 in figure 7-1; the identifiers K1 through K4 refer to the buttons shown in that
figure).

Table 7-2 Display Features

Feature Item Function

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

ture in the work space either in °C or °F (depending on the user’s
preferences, see “Temperature Display Unit” on page 7-31).
Alternatively, a flashing time entry prompt of the general format

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

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

2010-03-29 12:59

On Off

29.03.2010 12:59

heating relay

Timer

error

(E109)

PM

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
selected using the Menu (K1) and arrow buttons

Menü item, as

Left (K2) and

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

given in table 7-3.

Note If a menu item cannot be selected, then the function it

represents is not part of the equipment configuration of your unit.

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 4-10).

Door open icon is only functional with OGH-S Series and

D2. The alarm may be acknowledged by

On/Off button (item K3 in figure 7-1).

Set for temperature set value in either °C

Fan

D5

D6

Note The

OMH-S Series 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

pressing the button .

- The readiness indicator icon appears when the oven has been

switched off using the

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

Display Unit” on page 7-31).

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)

- 20% (chevron 1 illuminated)

- 40% (chevrons 1 and 2 illuminated)

- 60% (chevrons 1 through 3 illuminated)

- 80% (chevrons 1 through 4 illuminated)

- 100% (chevrons 1 through 5 illuminated)

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 (position D3 in figure 7-1)

.

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

Te mperature Set Value

Allows for changing the temperature set value (factory-preset to
50 °C/122 °F) within the permissible temperature range. The set value
can be changed by pressing the

can, after confirming your changes with the

Left and Right (item K2 or K4) and you

Menu/Enter button (item

K1), track the impact on the actual temperature in the multifunctional dis­play pane at D1.

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 arrow 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 7-8.

Booster

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 7-17.

Fan

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 7-19.

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 7-21.

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 7-23)
Program (Instructions: “Programming” on page 7-37)

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

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
Switching the Oven Off / Powering Down

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 ≥ 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

Switching the Oven Off / Powering Down

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. The usable set temperature range of Heratherm ovens has a factory-preset
lower limit of 50 °C (122 °F). 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.

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.

Thermo Scientific Heratherm 7-7

Handling and Control
Switching the Oven Off / Powering 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 7-9 and

table 7-8 on page 7-9, 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, while its use as an off timer
and on timer are described in table 7-10 on page 7-10 and table 7-11 on page 7-10,
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, while
instructions for programming the daily turn-on and turn-off times are given in table 7-13

on page 7-11.

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.

2010-04-12 10:14

Settings

Timer

2010-04-12 10:14

Settings

Timer

Count Down

PM

Press to switch to the Timer menu item and

confirm the selection with .

PM

Press or to preselect the Countdown timer

as the mode of your choice, then use to confirm

the selection.

The display returns to its default mode.

7-8 Heratherm Thermo Scientific

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.

Handling and Control

Switching the Oven Off / Powering Down

2010-03-29 12:59

Timer

On Off

2010-03-29 1:05

Off-Timer

00:00

PM

PM

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 an

arrow 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.

2010-03-29 12:59

Timer

On Off

PM

Press to select the on timer option On, then

to confirm.

2010-03-29 1:05

On-Timer

00:00

PM

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

the menu bar with a hand rotating on its face.

Additionally, the readiness indicator icon is illuminated.

Thermo Scientific Heratherm 7-9

Handling and Control
Switching the Oven Off / Powering Down

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 .

2010-04-12 10:14

Settings

Timer

Absolute

Table 7-10Setting a Fixed-time Off Timer

PM

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.

Press to activate the menu bar, then use to

select the Timer icon and press to confirm.

2010-03-29 12:59

Timer

On Off

2010-03-29 1:05

Off-Timer

2010-03-29 1:05

PM

Press to select the off timer option Off.

PM

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

PM

, followed by to confirm.

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

arrow is rotating on the icon’s face.

Table 7-11Setting a Fixed-time On Timer

Press to activate the menu bar, then use to

select the Timer icon and press to confirm.

2010-03-29 12:59

Timer

On Off

7-10 Heratherm Thermo Scientific

PM

Press to select the on timer option On, then

to confirm.

Table 7-11Setting a Fixed-time On Timer

Handling and Control

Switching the Oven Off / Powering Down

2010-03-29 1:05

On-Timer

2010-03-29 1:05

Setting a Weekly Timer

Table 7-12Presetting the Weekly Timer Mode of Operation

2010-04-12 10:14

Settings

Timer

PM

PM

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

, followed by to confirm.

The oven switches off.

The display goes out, the Timer icon is illuminated in

the menu bar with a hand rotating on its face.

Additionally, the readiness indicator icon is illuminated.

Press to activate the menu bar, then use to

select the Settings icon and press to confirm.

PM

Press to switch to the Timer menu item and

confirm the selection with .

2010-04-12 10:14

Settings

Timer

Weekly

PM

Press or to preselect the Weekly timer as the

mode of your choice, then to confirm the selection.

The display returns to its default mode.

Table 7-13Setting a Weekly Timer

Press to activate the menu bar, then use to

select the Timer icon and press to confirm.

2010-03-29 12:59

Timer

On

2010-03-29 12:59

Timer

Edit

PM

In the selection screen shown at left, press to

switch from Onto the Edit option.

PM

Select the Edit option by pressing .

Thermo Scientific Heratherm 7-11

Handling and Control
Switching the Oven Off / Powering Down

Table 7-13Setting a Weekly Timer

2010-03-29 12:59

2010-03-29 1:05

Monday

Off-Timer

On: 08:00

2010-03-29 1:05

Off: 06:00

2010-03-29 12:59

2010-03-29 1:05

Sunday

Off-Timer

On: --:--

2010-03-29 1:05

Off: --:--

AM

PM

AM

PM

PM

Press to select the On time” for Monday, which

PM

should start flashing when selected (or continue to the

PM

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

PM

PM

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

PM

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

2010-03-29 12:59

Save ?

No Yes

2010-03-29 12:59

Timer

On

Sunday are disabled by default.)

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.

PM

When prompted to save your changes, press to

confirm.

Note This prompt for saving also appears when you press the

button

PM

To enable the weekly timer press .

Esc while working on the weekly timer’s settings.

Alternatively, press and to select the Off

option if the weekly timer you have just saved should be

activated at a later date.

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

arrow is rotating on the icon’s face.

7-12 Heratherm Thermo Scientific

Stopping a Timer

Table 7-14Stopping an Off Timer Before It Expires

Handling and Control

Switching the Oven Off / Powering Down

Press to activate the menu bar, then use to

select the Timer icon and press to confirm.

2010-03-29 1:12

Stop Timer ?

No Yes

PM

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 7-15Stopping 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.

2010-03-29 1:12

Stop Timer ?

No Yes

PM

In the Stop Timer? prompt that appears, confirm the

default selection Ye s by pressing .

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

The display returns to its default mode.

Table 7-16Stopping a Weekly Timer Before It Expires

Press to activate the menu bar, then use to

select the Timer icon and press to confirm.

2010-03-29 12:59

Timer

On

The flashing word On appears in the multifunctional

PM

display pane.

Press to switch to Off state, then press .

2010-03-29 12:59

Timer

Off

PM

Thermo Scientific Heratherm 7-13

Handling and Control

-

Switching the Oven Off / Powering Down

Table 7-16Stopping a Weekly Timer Before It Expires

03-29 4:05

er stopped!

PM

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.

7-14 Heratherm Thermo Scientific

Handling and Control

Switching the Oven Off / Powering Down

Light

This menu item toggles the interior light in the work space of the device on and off (requires
optional inspection package). While the light is switched on the Light icon is illuminated in
the menu bar.

Table 7-17Turning the Light On

Press to activate the menu bar, then use to

select the Light icon and press to confirm.

2010-03-31 1:34

Timer

On Off

2010-03-31 1:34

Timer

On

PM

PM

In the selection screen that appears confirm the

selection by pressing .

The selected option On remains in the multifunctional

display pane for a few seconds to let you track your

action.

The display returns to its default mode.

The Light icon in the menu bar is illuminated to indicate

that the light is on inside the oven.

Table 7-18Turning the light off

Press to activate the menu bar, then use to

select the Light icon and press to confirm.

2010-03-31 1:34

Timer

On Off

PM

In the selection screen that appears confirm the

selection by pressing .

2010-03-31 1:35

Timer

Off

PM

The selected option Off remains in the multifunctional

display pane for two seconds to let you track your

action.

The display returns to its default mode.

The Light icon in the menu bar is extinguished to

indicate that the light is off inside the oven.

Thermo Scientific Heratherm 7-15

Handling and Control
Switching the Oven Off / Powering Down

The workspace lighting is not designed for use as a permanent
illumination source. Use it for brief visual checks of the device‘s interior
only.

The Viewing Package with viewing windows and workspace lighting
limits the operating temperature range of the heating and drying oven to
250 °C (482 °F).

Lighting Restrictions

Maximum Operating Temperature

7-16 Heratherm Thermo Scientific

Handling and Control

Switching the Oven Off / Powering Down

Boost

The boost feature 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 temperature­sensitive 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 7-19Turning 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.

2010-03-31 1:34

Timer

On Off

2010-03-31 1:34

Timer

On

PM

PM

In the selection screen that appears, confirm the

preselected option On by pressing .

The selected option On remains in the multifunctional

display pane for a few seconds to let you track your

action.

Thermo Scientific Heratherm 7-17

Handling and Control
Switching the Oven Off / Powering Down

Table 7-19Turning Boost On

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
protection equipment when loading the work space
of the oven!

Table 7-20Turning boost off prematurely

Press to activate the menu bar, then use to

select the Boost icon and press to confirm.

2010-03-31 1:34

Timer

On Off

2010-03-31 1:35

Timer

Off

PM

PM

In the selection screen that appears, confirm the

preselected option Off by pressing .

The selected option Off remains in the multifunctional

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

indicate that boost mode has been turned off.

7-18 Heratherm Thermo Scientific

Handling and Control

Switching the Oven Off / Powering Down

Fan

This menu item (OMH Series and OMH-S Series only) allows for gradually adjusting the
speed of the fan between 20 and 100 percent. OMH Series and OMH-S Series ovens employ
forced ventilation, that is, the fan runs continuously with at least 20% of its maximum speed
to ensure forced ventilation of the oven’s work space. 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. The fan can

be adjusted in 5 levels:

• 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 7-21Turning on the Fan

Press to activate the menu bar, then use or

31.03.2010 14:15

20%

The settings dialog shown at the left appears in the

multifunctional display pane now, with the value 20%

flashing.

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

31.03.2010 14:15

100%

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.

to select the Fan icon and press to confirm.

The display returns to its default mode.

The Fan icon in the menu bar is illuminated now to

indicate that the fan is running.

Thermo Scientific Heratherm 7-19

Handling and Control
Switching the Oven Off / Powering Down

Table 7-22Adjusting Fan Speed

Press to activate the menu bar, then use or

to select the Fan icon and press to confirm.

31.03.2010 14:15

20%

31.03.2010 14:15

80%

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.

If the Heater prot. message appears when you try to turn
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 in the multifunctional display pane.

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 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.

7-20 Heratherm Thermo Scientific

Handling and Control

Switching the Oven Off / Powering Down

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 through 4 illuminated

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

Table 7-23Opening the Damper

10.04.2010 14:37

0

2010-04-10 2:37

1

10.04.2010 14:37

3

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.

PM

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.

The Damper icon in the menu bar is illuminated now to

indicate that the damper has been opened and how far.

Thermo Scientific Heratherm 7-21

Handling and Control
Switching the Oven Off / Powering Down

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

Press to activate the menu bar, then use or

to select the Damper icon and press to

confirm.

10.04.2010 14:37

3

2010-04-10 2:37

1

10.04.2010 14:37

0

The settings dialog shown at left appears in the

multifunctional display pane now, with the current

damper position flashing already.

PM

Use or to change the damper position, then

confirm with .

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.

7-22 Heratherm Thermo Scientific

Handling and Control

Switching the Oven Off / Powering Down

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 7-25Reading the Error Log

Press to activate the menu bar, then use or

to select the Settings icon and press to

confirm.

2010-04-06 1:33

Settings

Error

PM

Press to select the Error item from the Settings

submenu.

2010-04-06 1:36

Error 0

2010-04-06 1:31

Fan Error (E009)

Thermo Scientific Heratherm 7-23

The first entry of the error log is displayed, numbered

PM

“0”. This entry represents the most recently registered

PM

error.

Handling and Control
Switching the Oven Off / Powering Down

Table 7-25Reading the Error Log

Calibration

2010-04-06 1:37

Error 1

2010-04-06 1:34

Heat Relay (E109)

PM

PM

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 .

The Settings icon in the menu bar will go out.

The Settings -> Calibration menu item enables the user to initiate a temperature calibration
routine (see “Temperature Calibration Procedure” on page 10-3) 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” on page 7-37.

• 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.

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.

7-24 Heratherm Thermo Scientific

Handling and Control

Switching the Oven Off / Powering Down

Table 7-26Entering the Calibration Reference Temperature Manually

Press to activate the menu bar, then use or

to select the Settings icon and press to

confirm.

2010-04-06 1:33

Settings

Error

2010-04-06 1:33

Settings

Calibration

2010-04-06 1:33

Settings

Calibration

Manual

2010-04-06 1:33

Settings

Calibration

36.9°C

PM

PM

PM

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 .

PM

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 7-27ECO Temperature Calibration

Place the temperature sensor at the location where the

sample is to be placed. Route the sensor lead through

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.

Thermo Scientific Heratherm 7-25

Handling and Control
Switching the Oven Off / Powering Down

Table 7-27ECO Temperature Calibration

2010-04-06 1:33

Settings

Error

2010-04-06 1:33

Settings

Calibration

2010-04-06 1:33

Settings

Calibration

Eco

2010-04-06 1:33

2010-04-06 1:33

Calibration

Calibration

Auto

Eco

On

Off

PM

PM

PM

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 .

PM

In the Calibration selection screen, press to

choose the Eco option and confirm the selection with

.

The current operating status appears in the display

PM

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

2010-04-06 1:33

Calibration

Eco

On

2010-04-06 1:35

Eco Calib. Running

PM

a few seconds to let you track your action.

The confirmation message Eco Calib. Running appears

PM

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.

7-26 Heratherm Thermo Scientific

Handling and Control

Switching the Oven Off / Powering Down

Table 7-28Entering 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.

2010-04-06 1:33

Settings

Error

2010-04-06 1:33

Settings

Calibration

2010-04-06 1:33

Settings

Calibration

Sample

2010-04-06 1:33

Settings

Calibration

36.9°C

PM

PM

PM

PM

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

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.

Thermo Scientific Heratherm 7-27

Handling and Control
Switching the Oven Off / Powering Down

Date and Time

The Settings -> Time / Date option allows for switching between the international time and
date display formats and for setting the time and date of the internal clock. There are two
display formats to choose from:

• European date format DD.MM.YYYY and 24-hours time format. Example: 07.04.2010
and 15:05.

• US standard date format YYYY-MM-DD and 12-hour time format with AM/PM suffix.
Example: 2010-04-07 and 3:05 PM.

Table 7-29Setting the Date Format

Press to activate the menu bar, then use or

to select the Settings icon and press to

confirm.

2010-04-06 1:33

Settings

Error

2010-04-07 3:05

Settings

Time / Date

2010-04-07 3:05

Settings

Time / Date

Date

07.04.2010 3:05

Settings

Time / Date

Date

PM

PM

The Error menu item from the Settings submenu

appears in the multifunctional display pane.

Press to switch to the Time / Date menu item and

confirm the selection with .

The Date menu item is flashing in the multifunctional

PM

display pane.

Choose the preselected option Date by pressing .

The date field will start flashing in the upper left corner

of the multifunctional display pane.

PM

Press or to switch to the desired date format

DD.MM.YYYY or YYYY-MM-DD and confirm the

selection with .

The date field in the upper left corner will change its

appearance according to your selection (and stop

flashing).

The display returns to its default mode.

The Settings icon in the menu bar will go out.

7-28 Heratherm Thermo Scientific

Table 7-30Setting the Time Format

Press to activate the menu bar, then use or

to select the Settings icon and press to

confirm.

Handling and Control

Switching the Oven Off / Powering Down

2010-04-06 1:33

Settings

Error

2010-04-07 3:05

Settings

Time / Date

2010-04-07 3:05

Settings

Time / Date

Date

2010-04-07 3:05

Settings

Time / Date

Time

PM

The Error menu item from the Settings submenu

appears in the multifunctional display pane.

PM

Press to switch to the Time / Date menu item and

confirm the selection with .

The Date menu item is flashing in the multifunctional

PM

display pane.

PM

In the flashing Date menu item, press to switch to

the Time option and confirm the selection with .

The Time menu item is flashing in the multifunctional

display pane, along with the time field in the upper right

2010-04-07 15:05

Settings

Time / Date

Time

corner.

Press or to switch to the desired time format

hh:mm or hh:mm AM/PM and confirm the selection with

.

The time field in the upper left corner will change its

appearance according to your selection (and stop

flashing).

The display returns to its default mode.

The Settings icon in the menu bar will go out.

Thermo Scientific Heratherm 7-29

Handling and Control
Switching the Oven Off / Powering Down

Table 7-31Setting Date and Time

Press to activate the menu bar, then use or

to select the Settings icon and press to

confirm.

2010-04-06 1:33

Settings

Error

2010-04-07 3:05

Settings

Time / Date

2010-04-07 3:05

Settings

Time / Date

Date

2010-04-07 3:05

Settings

Time / Date

Set

PM

PM

The Error menu item from the Settings submenu

appears in the multifunctional display pane.

Press to switch to the Time / Date menu item and

confirm the selection with .

The Date menu item is flashing in the multifunctional

PM

display pane.

PM

From the flashing Date menu item, press to switch

to the Set option and confirm the selection with .

The Set menu item is flashing in the multifunctional

display pane now, along with the year section of the

date field in the upper left corner.

Press or to set the year and confirm your

settings with .

The flashing selection moves on to the month section of

the date field. Set months, days, hours and minutes

using or and confirm each setting with .

When you confirm with the button after setting the

minutes, the date and time field in the upper right

corner will be updated according to your settings (and

stop flashing).

The display returns to its default mode.

The Settings icon in the menu bar will go out.

7-30 Heratherm Thermo Scientific

Temperature Display Unit

The Settings ->°C / °F menu item allows for toggling the unit used for displaying
temperatures between degrees Centigrade and Fahrenheit.

Note This setting does not have any impact on data logging via the RS-232 interface. Any

temperature data that is logged to a computer for operational parameter documentation
purposes is handed over in °C.

Table 7-32Toggling the Temperature Display Unit

Handling and Control

Switching the Oven Off / Powering Down

Press to activate the menu bar, then use or

to select the Settings icon and press to

confirm.

2010-04-06 1:33

Settings

Error

2010-04-07 10:31

Settings

°C / °F

2010-04-07 10:31

Settings

°C / °F

°C

2010-04-07 10:31

Settings

°C / °F

°F

PM

The Error menu item from the Settings submenu

appears in the multifunctional display pane.

AM

Press to switch to the °C / °F menu item and

confirm the selection with .

The multifunctional display pane changes to the

AM

following selection screen, with the currently unused

temperature display unit flashing (°C or °F) (The factory

default setting is °F).

Confirm the selection with .

AM

The temperatures in the display pane (item D1 in

figure 7-1 on page 7-1) and settings pane Set (item D5

in the same figure) will be displayed with the newly

selected unit.

The display returns to its default mode.

The Settings icon in the menu bar will go out.

Thermo Scientific Heratherm 7-31

Handling and Control
Switching the Oven Off / Powering Down

Process Protection

Process Protection kicks in when a program enters hold mode. When the temperature
measured by the built-in sensor is found to depart from the set value by more than 0.5 °C
(32.9 °F), the remaining time in hold mode is suspended until the temperature difference
between the actual value and set value returns to less than 0.5 °C /32.9 °F).

Table 7-33Toggling Process Protection On and Off

Press to activate the menu bar, then use or

to select the Settings icon and press to

confirm.

2010-04-06 1:33

Settings

Error

2010-04-07 10:31

Settings

Protection

2010-04-07 12:43

Settings

Protection

On

2010-04-07 12:43

Settings

Protection

Off

PM

AM

PM

PM

The Error menu item from the Settings submenu

appears in the multifunctional display pane.

Press to switch to the Protection menu item and

confirm the selection with .

In the selection screen that appears, press to

switch from On to Off state.

To activate switch from Off to On state accordingly.

Confirm the selection with .

The display returns to its default mode.

The Settings icon in the menu bar will go out.

7-32 Heratherm Thermo Scientific

Program Preferences

The Settings ->Program menu item supports the preferences described in the following for
the execution of user programs (see “Programming” on page 7-37.) used to control the oven’s
operations. When a program terminates after running through one or more program cycles
(see the section “Program Cycle Prompt” below), a single audible signal consisting of 5 beeps is
given when no error condition is present. The oven is then switched off, unless the user has set
the preferences to keep it running, as explained in the section “Mode after End (of Program)”
on page 7-34.

Program Cycle Prompt

This menu item allows for enabling a prompt (deactivated when the oven ships from the
factory) that asks for the number of times a program should be repeated (see “Launching a

Program” on page 7-39) whenever the user launches a program.

Table 7-34Activating / Deactivating the Program Cycle Prompt

Handling and Control

Switching the Oven Off / Powering Down

2010-04-06 1:33

Settings

Error

2010-04-09 13:43

Settings

Program

2010-04-09 13:43

Settings

Program

Loops

PM

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.

PM

Press to switch to the Program menu item and

confirm the selection with .

In the selection screen that appears, choose the

PM

preselected option Loops by pressing .

Thermo Scientific Heratherm 7-33

Handling and Control
Switching the Oven Off / Powering Down

Table 7-34Activating / Deactivating the Program Cycle Prompt

2010-04-09 13:43

Program

Loops

On

2010-04-09 13:43

Program

Loops

Off

Mode after End (of Program)

Additionally this command allows for enabling a second prompt (also deactivated when the
oven ships from the factory) that appears when the user launches a program and asks for the
mode of operation the oven should continue to run upon completion of the program (see

“Launching a Program” on page 7-39):

PM

In the subsequent selection screen, enable the prompt

(deactivated in “as shipped” state) by using to

move the selection from Off to On state and confirm the

selection with .

To deactivate the prompt, switch back from On to Off.

PM

Confirm your selection by pressing .

When you choose Off, the oven is switched off after just

one program cycle. You may change this default

behavior by changing the “Mode after End (of

Program)” preference explained in the next section.

The display returns to its default mode.

The Settings icon in the menu bar will go out.

• Off: This option does not prompt the user to confirm before program start. It turns the
device off when the program ends.

• On: When the user launches a program, this option prompts whether the oven should be
turned off or continue to run in hold mode with the latest settings until the user
acknowledges the end of the program.

An active weekly timer will be suspended until the Program End message is acknowledged.
Upon resuming the timer, the oven will seek to establish the set value that was in place before
the program was started (including fan speed and damper position).

Table 7-35Changing the Mode after End

Press to activate the menu bar, then use or

to select the Settings icon and press to

confirm.

2010-04-06 1:33

Settings

Error

PM

The Error menu item from the Settings submenu

appears in the multifunctional display pane.

7-34 Heratherm Thermo Scientific

Table 7-35Changing the Mode after End

Handling and Control

Switching the Oven Off / Powering Down

2010-04-09 13:43

Settings

Program

2010-04-09 13:43PM

Settings

Program

Loops

2010-04-09 13:43

Settings

Program

Mode after End

2010-04-09 13:43

Program

Mode after End

On

PM

PM

Press to switch to the Program menu item and

confirm the selection with .

In the selection screen that appears press to

switch from the preselected option Loops to Mode after

End, then confirm the selection with .

PM

In the subsequent selection screen press or

to switch between the On (Temperature Hold) and Off

(factory default) states, then confirm the selection with

2010-04-09 13:43

Configuration

The Settings -> Configuration menu item enables the user to enter a four-digit code that
loads a specific set of operating parameters for the oven - for example, in order to make the
voltage selection described in the section “Connecting the RS-232 Interface” on page 5-9.

.

PM

Program

Mode after End

Off

The display returns to its default mode.

The Settings icon in the menu bar will go out.

Thermo Scientific Heratherm 7-35

Handling and Control
Switching the Oven Off / Powering Down

Table 7-36Entering the Four-digit Code

Press to activate the menu bar, then use or

to select the Settings icon and press to

confirm.

2010-04-06 1:33

Settings

Error

2010-04-12 12:00

Settings

Configuration

2010-04-12 12:00

Settings

Configuration

0208

2010-04-12 12:00

Settings

Configuration

0240

PM

PM

PM

The Error menu item from the Settings submenu

appears in the multifunctional display pane.

Press to switch to the Configuration menu item and

confirm the selection with .

The multifunctional display pane will present a prompt

similar to the example shown at left, with the first digit of

the four-digit configuration code flashing.

Set the first digit of the configuration code using (or

PM

) and confirm your setting with . Set the

remaining three digits exactly as described above.

By confirming your entry for the last digit with , the

new configuration is activated immediately.

The display returns to its default mode.

The Settings icon in the menu bar will go out.

Enter the four-digit code ‘1234’ to reset the user

calibration.

Enter the four-digit code ‘4321’ to reset the sensor

sample calibration.

7-36 Heratherm Thermo Scientific

Handling and Control

Switching the Oven Off / Powering Down

Programming

The menu item Program enables the user to create, store and launch up to 10 programs for
automating workflows. Each of the 10 programs may consist of a maximum of 10 steps.

The following properties may be defined for each step, depending on the current hardware
configuration:

• duration in hh:mm

• temperature set value

• fan speed level (1 through 5;

• damper position (0 through 3)

To ease the creation of programs users may choose to copy and edit existing programs.

End of Program

The end of a program is indicated by an audible signal (5 beeps). The oven is switched off or
changes to Temperature Hold mode, as preset in the preferences under “Changing the Mode

after End” on page 7-34). The display shows the message Program End as well as the

temperature of the residual heat.

ECO Convenience Program

With Heratherm OGH-S Series and OMH-S Series ovens, the Eco convenience program allows
for turning off an oven automatically from within an ongoing drying process as soon as the samples
are dry. This requires that a sample sensor (accessory to be ordered separately) be connected to a
dedicated port on the rear panel of the oven and inserted into the sample to be dried.

While the drying process is ongoing, the actual workspace temperature is continuously
compared with the sample temperature measured by the sample sensor. At the beginning of
the drying process, the cooling effect produced by evaporation prevents the sample from
reaching the specific temperature limit preset during the Eco calibration routine. As soon as
the entire humidity has evaporated from the sample to be dried, the sample sensor will
measure a rise in temperature. If monitoring of the sample temperature indicates that the limit
has been exceeded, the drying process is terminated and the oven shuts down automatically.

The temperature limit is computed from the differential between the actual workspace and
sample temperatures, which means that it is depends on the location of the sample in the
device‘s workspace and the temperature set value for the drying process. Therefore, using the
Eco convenience program requires a previous Eco calibration of the sample sensor. This
calibration routine should be repeated whenever the placement of the sample or the
temperature set value for the drying process are varied in a significant way.

The Eco calibration result is factored into the program termination criteria only and does not
have any impact on the sample sensor temperature readout in the multifunctional display pane.

Thermo Scientific Heratherm 7-37

Handling and Control
Switching the Oven Off / Powering Down

Preparing the Oven for the Eco Convenience Program - Carrying Out Eco Calibration

1. Connect the sample sensor to the port on the rear panel of the oven, then insert it through
the tube access port (also found on the rear panel of the device) into the oven‘s workspace.
The multifunctional display pane shows the temperature measured by the sample sensor.

2. Mount the sample sensor at the intended location of the sample to be dried in the device‘s
workspace.

Note The sample to be dried must not be placed in the oven‘s workspace for carrying out

Eco calibration.

3. Set the temperature set value for the future drying process on the oven.

4. Adjust the damper to position 3 so it is fully opened – as would be the case during the
drying process.
Once the intended temperature set value has been reached, allow for a 2 hour wait period
so the oven can establish a stable thermal state.

5. Choose the Eco option from the Settings -> Calibration menu and confirm with .
Eco calibration will start now.

Loading the Oven with the Sample to be Dried

1. Allow the oven to cool down.

2. Place the sample to be dried at the location in the workspace for which the most recent
Eco calibration has been carried out.

3. Insert the sample sensor into the sample.

Eco Convenience Program Flow

1. On the oven set the temperature set value for the drying process for which you have
carried out the most recent Eco calibration.

2. Launch the Eco program as explained in table 7-37, “Launching a Program,” on page 39.
Choose the Eco option instead of P1…P10. None of the possible prompts will appear in
that case. While the Eco convenience program is running, the multifunctional display
pane reads Eco.

3. Once the oven‘s built-in controller has established the workspace temperature at the
specified set value, monitoring for the sample temperature limit starts.

4. The drying process ends when the temperature limit is exceeded. The end of the program
is indicated by an audible signal (5 beeps), an Eco End! message appears in the
multifunctional display pane, and the oven turns off automatically.

7-38 Heratherm Thermo Scientific

Instructions

Table 7-37Launching a Program

Handling and Control

Switching the Oven Off / Powering Down

Press to activate the menu bar, then use or

to select the Program icon and press to

confirm.

2010-04-13 10:25

Program

Start

2010-04-13 10:25

Start

P1 P2 P3 P4

Eco

2010-04-13 10:25

Start

Loops

1

AM

In the selection screen shown at left, choose the

preselected option Start by pressing .

Stop Timer Prompt Upon Launching a Program

When a timer is running, an additional Stop Timer prompt
appears at this point (see “Stopping an Off Timer Before It

Expires” on page 7-13.). Choosing Yes aborts the timer and

launches the selected program. Choosing No allows the
timer to continue running. However, when a user program
and a timer overlap, the program about to launch has priority
over the timer, that is, the timer will be put on hold and exe­cute only after the program has finished.

AM

In the list of existing programs (for example: P1...P4)

shown at left, maintain the default selection P1 or

choose another program using (or ).

In either case, press to launch the program.

AM

If activated in the preferences for programs ( see

“Activating / Deactivating the Program Cycle Prompt”

on page 7-33.), the Loops prompt appears, asking for

the desired number of program cycles (= Loops).

Set the number of cycles by using or (default

is “1” for one cycle) and confirm with .

2010-04-13 10:25

Start

Mode after End

Off

AM

If activated in the preferences for programs (see

“Changing the Mode after End” on page 7-34.), the

Mode after End prompt will appear. You may use this dia-

log to select the desired mode of operation after a pro-

gram has finished executing, that is, to have the oven

2010-04-13 10:25

Start

Mode after End

Hold Settings

Thermo Scientific Heratherm 7-39

AM

turn off or go to hold mode when the program ends.

Use or to choose the desired mode of

operation and confirm the selection with .

Handling and Control
Switching the Oven Off / Powering Down

Table 7-37Launching a Program

13.04.2010 11:05

P1 L1 3:02

1

2

The multifunctional display pane presents a progress

bar for the selected program, similar to the example

shown at left.

3 4 5

The functions of the display elements are explained in

table 7-39 on page 7-41 below.

The Program icon in the menu bar is illuminated to

indicate that a user program is running.

The functions of the display elements (save for the date and time fields; see table 7-2 on

page 7-3) are explained in the following table.

Table 7-38Display Elements Active during Program Execution

No. Function

These three fields show the following program execution information:

1

- ID of the active program - for example:

- number of the current program cycle - for example,
(appears only when the prompt for the number of program cycles is active; see

“Program Cycle Prompt” on page 7-33)

- overall remaining time - for example:

Note The remaining time does not include any phases whose duration has been

set to 00:00 in order to achieve rapid heat-up or cool-down of the oven.

This bar graph uses a variable number of bars to represent the progress of pro-

2

gram execution: Three bars - for example, indicate step No. 3, four bars step
No. 4 of a program, etc. Up to 10 bars may appear in this place, equivalent to a
maximum of 10 steps (see above).

P1 for Program 1

L1 for the first cycle

3:02

3 The Fan icon is illuminated to indicate that the fan has been turned on for the

current step of the program. The fan speed level can be determined from the bar
graph located directly above the icon (see table 7-2 on page 7-3).

4 The Damper icon is illuminated to indicate that the fan damper has been opened

for the current step of the program. The damper position can be determined
from the bar graph located directly above the icon (see table 7-2 on page 7-3).

5 The Program icon in the menu bar is illuminated to indicate that a user program

is running.

7-40 Heratherm Thermo Scientific

Table 7-39Abborting a Program

While a program is running (as indicated by the flashing

bar, program number and remaining time counter in the

multifunctional display pane and the Program icon

13.04.2010 11:05

P1 L1 3:02

1

2

3 4 5

illuminated in the menu bar) press or .

Handling and Control

Switching the Oven Off / Powering Down

2010-04-16 3:07

Stop Program?

No Yes

PM

When the prompt shown at left appears in the

multifunctional display pane, press to choose the

Yes option and confirm the selection with .

The display returns to its default mode.

The Program icon in the menu bar will go out.

Table 7-40Creating a New Program

Press to activate the menu bar, then use or

to select the Program icon and press to

confirm.

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Program

Start

AM

In the selection screen that appears press to

switch from the preselected option Start to New, then

confirm the selection with .

2010-04-13 10:25

Program

New

2010-04-13 10:25

New

P1 P2 P3 P4 P5

P6 P7 P8 P9 P10

AM

AM

In the following selection screen maintain the default

selection (for example P4) or choose any other program

from the list of free program memory slots (example at

left shows free memory slots at P4...P10) using (or

).

In either case press to start creating a new

program.

Thermo Scientific Heratherm 7-41

Handling and Control
Switching the Oven Off / Powering Down

Table 7-40Creating a New Program

New

P4

A programming screen appears for the first step of the

program, which is represented by a flashing empty bar.

If the first step is supposed to last longer than an hour

(up to 23 hours are supported), use to set the hour

count for the duration of the first step and confirm your

settings with .

Then, set the minute count using (or press :00 to

accept zero minutes) and confirm your settings with .

Setting the Duration of a Program Step

By letting the duration of the step default to
oven to heat up or cool down to the temperature set value as fast
as possible. If you enter a time span, the oven will rather try to
reach the set value along a continuously rising or falling ramp
curve. For each step that involves a temperature change, the
ramp is visually represented by a slanted top of the progress bar.

00:00, you instruct the

The selection moves on to the settings pane Set, which

will start flashing.

Use to set the desired temperature set value and

confirm your settings with .

Note If you need to set up a program that involves a subsequent cool-

down phase, you may want to consider programming the last step with a
set temperature value of 0 °C (32 °F) to speed up cool-down. For details
and instructions see

“Temperature Set Value” on page 7-7.

The selection moves on to the bar graph for the fan

speed, which will start flashing.

If you want the fan to run at more than 20% of its

maximum speed for the duration of the current program

step, use to set the desired fan speed level and

confirm your settings with .

The selection moves on to the bar graph for the

damper, which will start flashing.

If you want the damper to remain open for the duration

of the current program step, use to select the

desired damper position and confirm your settings with

.

7-42 Heratherm Thermo Scientific

Table 7-40Creating a New Program

Handling and Control

Switching the Oven Off / Powering Down

New

P4

Next

The Next prompt appears in the multifunctional display

pane.

If you wish to create an additional program step, press

the button .

The display returns to the initial stage of program

New

P4

Save

creation. Now, the second bar will be flashing,

representing the second program step.

If you do not wish to create an additional program step,

press or to continue to the Save option, then

press one more time to save the newly created

program.

The display returns to its default mode.

The newly created program may be launched now, as

described in “Launching a Program” on page 7-39.

Table 7-41Deleting an Existing Program

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Program

Start

2010-04-13 10:25

Program

Delete

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Delete

P1 P2 P3 P4

AM

AM

AM

Press to activate the menu bar, then use or

to select the Program icon and press to

confirm.

In the selection screen shown at left, press to

switch to the Delete option.

In the list of existing programs (for example:P1...P4;

default selection is P1) shown at left, choose any

program by pressing , then press to confirm

the deletion.

Thermo Scientific Heratherm 7-43

Handling and Control
Switching the Oven Off / Powering Down

Table 7-41Deleting an Existing Program

2010-04-13 10:25

Delete

P4

Yes No

AM

In the confirmation dialog for the deletion that appears,

press to choose the Ye s option (default selection is

No), then press to have the deletion carried out.

The display returns to its default mode.

The program memory is free to accept a new or copied

program (see “Creating a New Program” on page 7-41

and the procedure described below under “Copying an

Existing Program”).

Table 7-42Copying an Existing Program

Press to activate the menu bar, then use or

to select the Program icon and press to

confirm.

2010-04-13 10:25

Program

Start

AM

In the selection screen shown at left, press to

switch to the Copy option.

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Program

Copy

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Copy

P1 P2 P3 P4

2010-04-13 10:25

to

P5

P6 P7 P8 P9 P10

AM

AM

In the list of existing programs (for example P1...P4;

default selection is P1) shown at left, choose any

program by pressing , the press to start

copying.

In the list of free program memory slots in the selection

AM

screen that appears (for example: P5...P10) press

to choose a target slot for copying, then press to

confirm the copy target.

7-44 Heratherm Thermo Scientific