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.
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