OHAUS Guardian 2000 User manual

GuardianTM 2000
Hotplate-Stirrer, e-G21
Instruction Manual

GuardianTM Hotplate-Stirrers EN-1
Table of Contents
1. INTRODUCTION..............................................................................................2
1.1. Safety Information............................................................................2
1.2. Intended Use ...................................................................................3
1.3. Package Contents ...........................................................................3
1.4. Installation........................................................................................4
2. OVERVIEW......................................................................................................5
2.1. Dimensions......................................................................................5
2.2. Control Panel...................................................................................8
3. OPERATION ....................................................................................................9
3.1. Getting Ready..................................................................................9
3.2. Standby Mode..................................................................................9
3.3. Controlling the Stirrer.......................................................................9
3.4. Controlling the Top Plate Heater....................................................10
4. MAINTENANCE .............................................................................................11
4.1 Cleaning.........................................................................................11
4.2 Replacing Power Fuse...................................................................11
4.3 Troubleshooting.............................................................................13
4.4 Service Information........................................................................13
5. TECHNICAL DATA.........................................................................................14
6. COMPLIANCE................................................................................................14

EN-2 GuardianTM Hotplate-Stirrers
1. INTRODUCTION
This manual contains installation, operation and maintenance instructions for the
OHAUS GuardianTM 2000 hotplate-stirrer. Please read the manual completely
before using.
1.1. Safety Information
Definition of Signal Warnings and Symbols
Safety notes are marked with signal words and warning symbols. These show
safety issues and warnings. Ignoring the safety notes may lead to personal injury,
damage to the instrument, malfunctions and false results.
WARNING
For a hazardous situation with medium risk, possibly resulting in
severe injuries or death if not avoided.
CAUTION
For a hazardous situation with low risk, resulting in damage to
the device or the property or in loss of data, or minor or medium
injuries if not avoided.
ATTENTION
For important information about the product. May lead to
equipment damage if not avoided.
NOTE
For useful information about the product.
Warning Symbols
General
hazard
Explosion
hazard
Caution, hot
surface
Protective
conductor
terminal
Alternating
current
Electrical shock
hazard
Safety Precautions
WARNING! The protection provided by the unit may be impaired if used
with accessories not provided or recommended by the manufacturer, or
used in a manner not specified by the manufacturer.
•Always operate unit on a level surface for best performance and maximum
safety.
•DO NOT lift unit by the top plate.
•To avoid electrical shock, completely cut off power to the unit by
disconnecting the power cord from the unit or unplugging from the wall outlet.
•Disconnect unit from the power supply prior to maintenance and servicing.
•Spills should be removed promptly, after the unit has cooled down.
•Alkalis spills, hydrofluoric acid or phosphoric acid spills may damage the unit
and lead to thermal failure.
•DO NOT immerse the unit for cleaning.
•DO NOT operate the unit at high temperatures without a vessel/sample on the
top plate.
•DO NOT operate the unit if it shows signs of electrical or mechanical damage.
•Protective earthing of the equipment is achieved via connection of the
provided power cord to a compatible grounded power outlet.

GuardianTM Hotplate-Stirrers EN-3
WARNING: unit is not explosion proof. Use caution when unit is on or when
heating volatile materials.
WARNING! DO NOT use the unit in explosive atmospheres or with
materials that could cause a hazardous environment from processing. Keep
in mind the material flash point relative to the target temperature that has
been set.
CAUTION! The top plate can reach 500°C, DO NOT touch the heated
surface. Use caution at all times. Keep the unit away from explosive vapors
and clear of papers, drapery and other flammable materials. Keep the
power cord away from the heater plate.
CAUTION! Beware of the following risks when heating.
-Flammable materials
-Low boiling point combustible substances
-Glass breakage as a result of mechanical shaking power
-Incorrect container size
-Too much medium
-Unsafe condition of container
Earth Ground - Protective Conductor Terminal
Alternating Current
1.2. Intended Use
This instrument is intended for use in laboratories, pharmacies, schools, businesses
and light industry. It must only be used for processing materials as described in
these operating instructions. Any other type of use and operation beyond the limits
of technical specifications, without written consent from OHAUS, is considered as
not intended. This instrument complies with current industry standards and the
recognized safety regulations; however, it can constitute a hazard in use. If the
instrument is not used according to these operating instructions, the intended
protection provided by the instrument may be impaired.
1.3. Package Contents
•Hotplate Stirrer
•Power Cord
•Stir Bar

EN-4 GuardianTM Hotplate-Stirrers
1.4. Installation
Upon receiving the Ohaus Hotplate-Stirrer, check to ensure that no damage has
occurred during shipment. It is important that any damage that occurred in transport
is detected at the time of unpacking. If you do find such damage, the carrier must
be notified immediately.
After unpacking, place the Hotplate-Stirrer on a level bench or table, away from
explosive vapors. Ensure that the surface on which the unit is placed will withstand
typical heat produced by the unit and place the unit a minimum of six (6) inches
from vertical surfaces. Do not position the equipment such that it is difficult to
disconnect the power cord during use. Always place the unit on a sturdy work
surface.
The Hotplate-Stirrer is supplied with a 3 conductor, grounded power cord that
should be plugged into a matching standard grounded outlet. If the cord supplied
does not meet your needs, please use an approved power cord that has ratings
equal or exceeding those of the originally provided cord and that complies with the
local/national regulations of the country in which the equipment is to be used.
Replacement of the plug must be made by a qualified electrician.

GuardianTM Hotplate-Stirrers EN-5
2. OVERVIEW
2.1. Dimensions
Round Top Hotplate-Stirrer
Overall Dimensions (L x W x H)
264 x 163 x 101 mm (10.4 x 6.4 x 4.0'')
Top Plate Dimensions
Ø 13.5 cm (5.3”)
Top Plate Material
Ceramic coated stainless steel
Electrical (50 / 60 Hz)
- Hotplate Stirrer
- Hotplate
100 - 120 V ~5A / 220 - 240 V ~ 4 A
Electrical (50 / 60 Hz)
- Stirrer
100 - 120 V ~ 2 A / 220 - 240 V ~ 1 A
Fuses
- Hotplate Stirrer
- Hotplate
10 A, 5 x 20 mm, 250 VAC /
6.3 A, 5 x 20 mm, 250 VAC
Fuses
- Stirrer
6.3 A, 5x20 mm, 250 VAC
Temperature Range
50°to 380°C
Temperature Stability of Top Plate+
±3% (> 100°C), ±3°C (≤100°C)
Stir Capacity
15 L
Speed Range++
200 to 1600 rpm
Weight Capacity
Up to 15 kg (33 lbs)
Shipping Weight
- Hotplate Stirrer
- Hotplate
- Stirrer
3.1 kg
2.4 kg
2.9 kg
Note:
⚫+ The parameter in the specification table are applicable to 2” (5 cm) diameter
center of the top plate.
⚫++ Minimal speed varies depending on the stir bar, vessel and fluid conditions.

EN-6 GuardianTM Hotplate-Stirrers
4x4 Hotplate-Stirrer
Overall Dimensions (L x W x H)
264 x 163 x 110 mm (10.4 x 6.4 x 4.3'')
Top Plate Dimensions
10.2 x 10.2 cm (4 x 4”)
Top Plate Material
- Hotplate Stirrer
- Hotplate
Ceramic
Top Plate Material
- Stirrer
Resin
Electrical (50 / 60 Hz)
- Hotplate Stirrer
- Hotplate
100 –120 V ~5A / 220 –240 V ~ 4 A
Electrical (50 / 60 Hz)
- Stirrer
100 –120 V ~ 2 A / 220 –240 V ~ 1 A
Fuses
- Hotplate Stirrer
- Hotplate
10 A, 5 x 20 mm, 250 VAC /
6.3 A, 5 x 20 mm, 250 VAC
Fuses
- Stirrer
6.3 A, 5x20 mm, 250 VAC
Temperature Range
70°to 500°C
Temperature Stability of Top Plate+
±3% (> 100°C), ±3°C (≤100°C)
Stir Capacity
15 L
Speed Range++
200 to 1600 rpm
Weight Capacity
Up to 15 kg (33 lbs)
Shipping Weight
- Hotplate Stirrer
- Hotplate
- Stirrer
3.1 kg
2.4 kg
2.6 kg
Note:
⚫+The parameter in the specification table are applicable to 2” (5 cm) diameter
center of the top plate.
⚫++ Minimal speed varies depending on the stir bar, vessel and fluid conditions.

GuardianTM Hotplate-Stirrers EN-7
7x7 Hotplate-Stirrer
Overall Dimensions (L x W x H)
318 x 223 x 112 mm (12.5 x 8.8 x 4.4'')
Top Plate Dimensions
17.8 x 17.8 cm (7 x 7”)
Top Plate Material
- Hotplate Stirrer
- Hotplate
Ceramic
Top Plate Material
- Stirrer
Resin
Electrical (50 / 60 Hz)
- Hotplate Stirrer
- Hotplate
100 - 120 V ~ 10 A / 220 - 240 V ~ 7 A
Electrical (50 / 60 Hz)
- Stirrer
100 - 120 V ~ 2 A / 220 - 240 V ~ 1 A
Fuses
- Hotplate Stirrer
- Hotplate
15 A, 5 x 20 mm, 250 VAC /
10 A, 5 x 20 mm, 250 VAC
Fuses
- Stirrer
6.3 A, 5x20 mm, 250 VAC
Temperature Range
70°to 500°C
Temperature Stability of Top Plate+
±3% (> 100°C), ±3°C (≤100°C)
Stir Capacity
15 L
Speed Range++
200 to 1600 rpm
Weight Capacity
Up to 15 kg (33 lbs)
Shipping Weight
- Hotplate Stirrer
- Hotplate
- Stirrer
4.6 kg
3.9 kg
3.5 kg
Note:
⚫+The parameter in the specification table are applicable to 2” (5 cm) diameter
center of the top plate.
⚫++ Minimal speed varies depending on the stir bar, vessel and fluid conditions.

EN-8 GuardianTM Hotplate-Stirrers
2.2. Control Panel
1. Left Knob: Controls temperature.
2. Standby Switch
3. Heater Indicator: Illuminates when heater is running.
4. Hot Top Caution Indicator: Illuminates when the top plate surface is hot. Do
not touch!
5. Speed Indicator: Illuminates when stirrer is running.
6. Right Knob: Controls speed.
7. Power Entry Module (PEM)
8. Fuse
9. Accessory Rod Mounting Hole
Note: The top plates are of different dimensions and materials. Please refer to the
actual product for details.
3
4
2
5
1
6
9
8
7

GuardianTM Hotplate-Stirrers EN-9
3. OPERATION
3.1. Getting Ready
To get ready:
1. Plug the female end of the provided power cord into Power Entry Module
(PEM) on the rear side of the unit.
2. Plug the male end of the power cord into a matching standard grounded outlet.
3.2. Standby Mode
The standby switch on the front side of the unit controls standby mode.
1. When the unit is switched off:
a) All heating and stirring function will turn off.
b) If the top plate is hot, the on the control panel will remain illuminated.
2. When the unit is switched on:
a) The unit is ready for normal use.
b) If the heating and stirring knobs are turned off, heating and stirring
functions will remain off.
c) If the heating or stirring knobs are turned on, it starts heating or stirring
immediately.
3.3. Controlling the Stirrer
1 Rotate the right knob to control the speed setting.
a) Clockwise rotation will increase the speed setting.
b) Counterclockwise rotation will decrease the speed setting.


EN-10 GuardianTM Hotplate-Stirrers
2 To turn on the stirrer, rotate the knob clockwise from the OFF position. The
illuminates to indicate that the stirrer is on.
3 To turn off the stirrer, rotate the knob counterclockwise and return to the OFF
position. The light turns off to indicate that the stirrer is off.
STIRRING OPERATING TIPS
The stirrer increases speed at a steady rate until the setpoint is reached. If the
stirrer is not reaching its setpoint: 1) the stir bar may be too large, 2) the liquid may
be too viscous, 3) the setpoint speed may need to be reduced. Additionally, the
magnetic strength of stir bars reduce over time and may need to be replaced. Apart
from that, the bottom surface of the vessel can affect the stirring performance of the
magnetic stir bar. Adjust the vessel being used or change the stir bar to optimize
mixing in the sample.
When heating and stirring a reaction vessel within an oil bath or similar set-up, the
stirring function will stir up to approximately one inch (2.5 cm) from the top plate.
The stirring speed will vary according to liquid viscosity, spin bar length, and
distance from top plate. Adjust one or all of these to achieve the desired stirring
speed. For example: the closer the reaction vessel is to the top plate, the strong the
magnetic connection between the unit and the stir bar.
3.4. Controlling the Top Plate Heater
1 Rotate the left knob to control the heat setting.
a) Clockwise rotation will increase the heat setting.
b) Counterclockwise rotation will decrease the heat setting.
2 To turn on the heater, rotate the knob clockwise from the OFF position. The
illuminates to indicate that the heater is running.
3 To turn off the heater, rotate the knob counterclockwise and return to the OFF
position. The light turns off to indicate that the heater is off.

GuardianTM Hotplate-Stirrers EN-11
CAUTION: THIS DOES NOT MEAN THAT THE TOP PLATE IS SAFE TO TOUCH.
Once the heater is turned off and the heater’s temperature cools, the on the
control panel will disappear.
Typical Time to Boil Water
The chart below is an example of an approximate time to boil for the specified
amount of water in a specific vessel. These values are only approximate and can
vary from unit to unit. Values are based on 23°C water in an ambient environment
of 23°C.
Unit Size
Heater Temp. Limit
Volume of Water
Typical Time to Boil
Round Top
380°C
500mL in 1L beaker
≈25 min
7×7
500°C
500mL in 1L beaker
≈18 min
4×4
500°C
500mL in 1L beaker
≈30 min
4. MAINTENANCE
4.1 Cleaning
WARNING: Electric Shock Hazard. Disconnect the equipment from
the power supply before cleaning.
Make sure that no liquid enters the interior of the instrument.
Attention: Do not use solvents, harsh chemicals, ammonia or
abrasive cleaning agents.
The housing may be cleaned with a cloth dampened with a mild detergent if
necessary.
4.2 Replacing Power Fuse
The use of a fuse of a different type or with a different value, or
bridging or shunting the fuse is not allowed and can possibly
cause a hazard to your safety and lead to instrument damage!
WARNING: Electric Shock Hazard. Disconnect
the equipment from the power supply before
replacing the fuse.

EN-12 GuardianTM Hotplate-Stirrers
To replace the fuse:
1. Put the tip of a screwdriver or a test pen in the circled position below, and then
pull the fuse holder out.
2. Take out the old fuse and then push the new fuse into the slot. Choose the
correct fuse to replace according to the fuse specification listed in the
Dimensions Section.
Note: the unit comes with a spare fuse in the fuse holder (in the circled
position above).
Attention: If the fuse is good and power is available at the outlet, the cord or
unit may be defective. Try a new cord. If this does not work, the unit should be
sent back for servicing.
3. Push the fuse holder back in to finish the replacement.

GuardianTM Hotplate-Stirrers EN-13
4.3 Troubleshooting
The following table lists common problems and possible causes and remedies. If
the problem persists, contact OHAUS or your authorized dealer.
Table 4-1 Troubleshooting
Error
Cause of Error
How to Fix
Unit fails to
power on
Missing or blown fuse
Add or replace fuse as necessary.
Unit fails to
heat
Heater over temperature
or
Heater damage
Unplug and replug the power cord
for reset, if the failure consistent,
please contact Ohaus.
Unit fails to
stir
Motor overload
or
Motor damage
Smaller vessel or reduce volume in
vessel and wait for auto reset, if
the failure consistent, please
contact Ohaus.
4.4 Service Information
If the troubleshooting section does not resolve your problem, contact an authorized
OHAUS Service Agent. For Service assistance in the United States, call toll-free 1-
800-526-0659 between 8:00 AM and 5:00 PM Eastern Standard Time. An OHAUS
Product Service Specialist will be available to assist you. Outside the USA, please
visit our website www.ohaus.com to locate the OHAUS office nearest you.

EN-14 GuardianTM Hotplate-Stirrers
5. TECHNICAL DATA
Equipment Ratings:
Indoor use only
Altitude:
0 to 2000m
Operating temperature:
5°C to 40°C
Storage temperature:
-20°C to 65°C
Operating humidity:
20 to 80% relative humidity, non-condensing
Storage humidity:
20 to 80% relative humidity, non-condensing
Voltage fluctuations:
Mains supply voltage fluctuations up to ±10% of the
nominal voltage.
Overvoltage category
(Installation category):
II
Pollution degree:
2
6. COMPLIANCE
Compliance to the following standards is indicated by the corresponding mark on
the product.
Mark
Standard
This product complies with the applicable harmonized standards of
EU Directives 2011/65/EU (RoHS), 2014/30/EU (EMC) and
2014/35/EU (LVD). The EU Declaration of Conformity is available
online at www.ohaus.com/ce.
This product complies with the applicable statutory standards of the
Restriction of the Use of Certain Hazardous Substances in
Electrical and Electronic Equipment Regulations 2012, UK
Electromagnetic Compatibility Regulations 2016 and Electrical
Equipment (Safety) Regulations 2016. The UK Declaration of
Conformity is available online at www.ohaus.com/uk-declarations.
This product complies with the EU Directive 2012/19/EU (WEEE).
Please dispose of this product in accordance with local regulations
at the collecting point specified for electrical and electronic
equipment. For disposal instructions in Europe, refer to
www.ohaus.com/weee.
EN 61326-1
CAN/CSA-C22.2 No. 61010-1, CAN/CSA-C22.2 No. 61010-2-010,
CAN/CSA-C22.2 No. 61010-2-051
UL 61010-1, UL 61010-2-010, UL 61010-2-051
ISED Canada Compliance Statement:
CAN ICES-003(A) / NMB-003(A)
ISO 9001 Registration
The management system governing the production of this product is ISO 9001
certified.

GuardianTM Hotplate-Stirrers EN-15
FCC Supplier Declaration of Conformity
Unintentional Radiator per 47CFR Part B
Trade Name: OHAUS CORPORATION
Model or Family identification: e-G21xxxxx
Party issuing Supplier’s Declaration of Conformity:
Ohaus Instruments (Changzhou) Co., Ltd.
2F, 22 Block, 538 West Hehai Road, Xinbei District, Changzhou
Jiangsu 213022
China
Phone: [phone]
Responsible Party –U.S. Contact Information:
Ohaus Corporation
7 Campus Drive, Suite 310
Parsippany, NJ 07054
United States
Phone: [phone]
Web: www.ohaus.com
FCC Compliance Statement:
Note: This equipment has been tested and found to comply with the limits for a
Class A digital device, pursuant to part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause
harmful interference in which case the user will be required to correct the
interference at his own expense.
Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.

EN-16 GuardianTM Hotplate-Stirrers
LIMITED WARRANTY
OHAUS products are warranted against defects in materials and workmanship from
the date of delivery through the duration of the warranty period. During the warranty
period OHAUS will repair, or, at its option, replace any component(s) that proves to
be defective at no charge, provided that the product is returned, freight prepaid, to
OHAUS.
This warranty does not apply if the product has been damaged by accident or
misuse, exposed to radioactive or corrosive materials, has foreign material
penetrating to the inside of the product, or as a result of service or modification by
other than OHAUS. In lieu of a properly returned warranty registration card, the
warranty period shall begin on the date of shipment to the authorized dealer. No
other express or implied warranty is given by OHAUS Corporation. OHAUS
Corporation shall not be liable for any consequential damages.
As warranty legislation differs from state to state and country to country, please
contact OHAUS or your local OHAUS dealer for further details.

Agitadoras con parilla de calentamiento GuardianTM ES-1
Índice
1. INTRODUCCIÓN..............................................................................................2
1.1 Información sobre seguridad ...........................................................2
1.2 Uso previsto.....................................................................................3
1.3 Contenido ........................................................................................3
1.4 Instalación........................................................................................4
2. DESCRIPCIÓN GENERAL ..............................................................................5
2.1 Dimensiones....................................................................................5
2.2 Panel de control...............................................................................8
3. FUNCIONAMIENTO.........................................................................................9
3.1 Preparándose..................................................................................9
3.2 Modo de reposo...............................................................................9
3.3 Control de la agitadora ....................................................................9
3.4 Control del calentador de la placa superior ...................................10
4. MANTENIMIENTO .........................................................................................11
4.1 Limpieza ........................................................................................11
4.2 Sustitución del fusible de alimentación..........................................12
4.3 Resolución de problemas ..............................................................13
4.4 Información sobre mantenimiento..................................................13
5. DATOS TÉCNICOS........................................................................................14
6. CONFORMIDAD ............................................................................................15

ES-2 Agitadoras con parilla de calentamiento GuardianTM
1. INTRODUCCIÓN
Este manual contiene instrucciones de instalación, funcionamiento y mantenimiento
para el agitador con parilla de calentamiento GuardianTM 2000 de OHAUS. Lea el
manual en su totalidad antes de utilizar el producto.
1.1 Información sobre seguridad
Definición de las señales de advertencia y los símbolos
Las notas de seguridad están marcadas con palabras y símbolos de advertencia.
Estos indican problemas de seguridad y advertencias. No seguir las indicaciones
de seguridad, pueden producirse daños personales o materiales, funcionamientos
anómalos y resultados incorrectos.
ADVERTENCIA
Corresponde a una situación peligrosa con un riesgo medio,
que puede provocar lesiones graves o la muerte si no se evita.
PRECAUCIÓN
Corresponde a una situación peligrosa con un riesgo bajo, que
puede provocar daños en el dispositivo o la propiedad, pérdida
de datos o lesiones de carácter leve o medio si no se evita.
ATENCIÓN
Corresponde a información importante sobre el producto.
Pueden provocarse daños en el equipo si no se evita.
NOTA
Corresponde a información útil sobre el producto.
Símbolos de advertencia
Riesgo
general
Riesgo de
explosión
Precaución,
superficie
caliente
Terminal
conductor
de protección
Corriente
alterna
Riesgo de
descarga
eléctrica
Precauciones de seguridad
ADVERTENCIA: La protección proporcionada por la unidad puede verse
afectada si se utiliza con accesorios no suministrados o recomendados por
el fabricante, o si se utiliza de una manera no especificada por el fabricante.
•Utilice siempre la unidad sobre una superficie nivelada para obtener el mejor
rendimiento y la máxima seguridad.
•NO levante la unidad por la placa superior.
•Para evitar descargas eléctricas, corte completamente la alimentación de la
unidad desconectando el cable de alimentación de la unidad o desenchufándolo
de la toma de corriente.
•Desconecte la unidad de la fuente de alimentación antes de realizar cualquier
tarea de mantenimiento o reparación.
•Los derrames deben eliminarse inmediatamente después de que la unidad
se haya enfriado.
•Los derrames de álcalis, ácido fluorhídrico o ácido fosfórico pueden dañar
la unidad y provocar un fallo térmico.
•NO sumerja la unidad para limpiarla.
•NO utilice la unidad a altas temperaturas sin un recipiente o una muestra
en la placa superior.