Thermo Scientific MaxQ 2000 User manual

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User Manual
MaxQ 2000
Open-Air Platform Shaker
Operating Manual 057-278-00 (7004310) Rev. 13

Thermo Scientific
MANUAL NUMBER 057-278-00 (7004310)
13 41101 8/4/16 Removed the leveling kit note from page 1-2 ccs
12 40139 4/15/15 Updated warranty Information ccs
11 31361 7/18/14 Removed CE reference on pg 2-4 ccs
10 30954 4/10/14 Updated Setting Timer for Continuous Shaking Step 3 - pg 4-3 ccs
9 30147 7/19/13 Clarified the continuous shaking timer display on pg 4-3 ccs
8 29034 9/10/12 Added note to hyperterminal config information - pg 4-4 ccs
7 28316 3/6/12 Added platform mntg plate replacement instructions to Maintenance section ccs
6 -- 11/1/11 Added missing line to Step 12 on page 4-4 _ lost during transfer ccs
5 27615 7/22/11 Revised warranty ccs
Preface
MaxQ 2000 Shaker i
Models Covered In This Manual
Model numbers Voltage
SHKA2000 (4310) 120V
SHKE2000 (4314) 120V
SHKA2000-1CE (4311) 240V
SHKE2000-1CE (4315) 240V
SHKE2000CO2 (4316) 120V
SHKE2000CO2-1CE (4317) 240V

Thermo Scientificii MaxQ 2000 Shaker
Preface
Contains Parts and Assemblies
Susceptible to Damage by
Electrostatic Discharge (ESD)
CAUTION
Preface
Important Read this instruction manual. Failure to read, understand and follow the instructions in this manual
may result in damage to the unit, injury to operating personnel, and poor equipment performance. s
Caution All internal adjustments and maintenance must be performed by qualified service personnel. s
Material in this manual is for information purposes only. The contents and the product it describes are subject
to change without notice. Thermo Fisher Scientific makes no representations or warranties with respect to this
manual. In no event shall Thermo be held liable for any damages, direct or incidental, arising out of or related to
the use of this manual.
©2010 Thermo Fisher Scientific. All rights reserved.

Thermo Scientific MaxQ 2000 Shaker iii
Preface
Important operating and/or maintenance instructions. Read the accompanying text carefully.
Potential electrical hazards. Only qualified persons should perform procedures associated with this
symbol.
Equipment being maintained or serviced must be turned off and locked off to prevent possible injury.
Hot surface(s) present which may cause burns to unprotected skin, or to materials which may be
damaged by elevated temperatures.
WEEE Compliance: Thermo Fisher Scientific has contracted with companies for recycling/disposal in
each EU Member State. For further information, send an email to [email protected].
4Always use the proper protective equipment (clothing, gloves, goggles, etc.)
4Always dissipate extreme cold or heat and wear protective clothing.
4Always follow good hygiene practices.
4Each individual is responsible for his or her own safety.

Thermo Scientificiv MaxQ 2000 Shaker
Preface
Do You Need Information or Assistance on
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Regardless of your needs, our professional telephone technicians are available to assist you
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International customers, please contact your local Thermo Scientific distributor.

MaxQ 2000 Shaker vThermo Scientific
Table of Contents
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
Declaration of Conformity (CE only) . . . . . . . . . . . . . . . . . . . . . . . .2-4
A-Class Control Panel Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
E-Class Control Panel Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6
Unpacking and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Platform Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Electrical Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Flask Clamp Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Test Tube Rack Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Turning the Shaker On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Setting Shaking Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Calibrating Shaking Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
RS232 Interface Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
Setting Timer for Continuous Shaking . . . . . . . . . . . . . . . . . . . . . . .4-3
Setting Timer for Timed Shaking . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
RS-232 Communication Configuration . . . . . . . . . . . . . . . . . . . . . . .4-4
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Replacing Platform Mounting Plate . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Platform Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Electrical Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1
Ordering Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-2
Section 1
Section 2
Section 3
Section 4
Section 5
Section 6
Section 7

MaxQ 2000 Shaker 1-1Thermo Scientific
Section 1 Safety Information
Your Thermo Scientific MaxQ 2000 Shaker has been designed with
function, reliability, and safety in mind. It is your responsibility to install
it in conformance with local electrical codes. For safe operation, pay
attention to the alert signals (Warnings, Cautions, Notes) throughout the
manual.
This manual contains important operating and safety information. The
user must carefully read and understand the contents of this manual prior
to the use of this equipment.
Warnings
To avoid electrical shock, always:
1. Use a properly grounded electrical outlet of correct voltage and current
handling capacity.
2. Disconnect from the power supply prior to maintenance and servicing.
To avoid personal injury:
1. Do not use in the presence of flammable or combustible materials —
fire or explosion may result. This device contains components which
may ignite such materials. Not rated for use in hazardous atmospheres.
2. Use appropriate hand and eye protection when handling hazardous
chemicals.
3. Refer servicing to qualified personnel.
4. Do not modify construction and/or assembly of equipment.
5. Do not remove tags, labels, decals, or other information from the unit.
6. Stand clear of equipment when it is operating.
7. If shaking action will result in the evolution of gases or fumes, perform
the operation in a well-ventilated laboratory hood.

1-2 MaxQ 2000 Shaker Thermo Scientific
Section 1
Safety Information
8. Use equipment only for its intended purpose. Use only the accessories
and attachments that are shipped with the equipment, or are specified
for it. Substituting other attachments or accessories can produce
hazards or make the unit inoperative.
9. Perform regular maintenance service as specified in this manual and
keep unit in good repair. Do not operate with known defects.
10. User is to determine optimum load/speed combinations to ensure that
shaker operates safely with a balanced load. Normal operation can
include the requirements of the type of studies to be performed, i.e.
aeration, solubility, mixing, etc. The vessels should be securely
clamped before turning on shaker and contain a stopper whenever
possible to prevent hazardous substances from being thrown out
during shaking action. Shaking action should be set to begin at a slow
speed and gradually increased to desired speed. The following stability
chart indicates if additional bracing is required.
10 lbs 20 lbs 30 lbs 40 lbs 50 lbs
100 rpm No No No No No
200 rpm No No No No No
300 rpm No No No No No
325 rpm No No No No No
350 rpm No No No No No
400 rpm No No No No No
450 rpm No No No Yes Yes
475 rpm No No No Yes Yes
500 rpm No No No Yes Yes

MaxQ 2000 Shaker 2-1Thermo Scientific
Section 2 General Specifications
* Interface cables not to exceed 9.8’ (3m) in length
Model No. SHKA2000 (4310) SHKA2000-1CE (4311) SHKE2000 (4314) SHKE2000-1CE (4315)
Exterior Unit Dimensions in. (cm)
Width 13.5” (34.4 cm) 13.5” (34.4 cm) 13.5” (34.4 cm) 13.5” (34.4 cm)
Height 6.4” (16.3 cm) 6.4” (16.3 cm) 6.4” (16.3 cm) 6.4” (16.3 cm)
Length 17.4” (44.2 cm) 17.4” (44.2 cm) 17.4” (44.2 cm) 17.4” (44.2 cm)
Weight lbs (kg) 40 lbs (18.1 kg) 40 lbs (18.1 kg) 40 lbs (18.1 kg) 40 lbs (18.1 kg)
Electrical
Volts (AC) 120 220-240 120 220-240
Amps 0.6 0.8 0.75 0.4
Watts 45 100 45 45
Freq. 50/60 50/60 50/60 50/60
Speed 40 to 400 rpm, ±10 rpm 40 to 400 rpm, ±10 rpm 15 to 500 rpm, ±1 rpm 15 to 500 rpm, ±1 rpm
Timer Continuous or timed from
1-60 mins.
Continuous or timed from
1-60 mins.
Continuous or timed 0.1-999
hours or 0.1-999 min.
Continuous or timed 0.1-999
hours or 0.1-999 min.
Recorder Output None None None None
RS232 Interface* None None Monitor speed and time with a
computer
Monitor speed and time with a
computer
Display Analog tachometer
displays speed in rpm
Analog tachometer
displays speed in rpm
2 individual LED displays indi-
cate time and speed simultane-
ously. 3 characters height 1/2
inches (1.27 cm)
2 individual LED displays indi-
cate time and speed simultane-
ously. 3 characters height 1/2
inches (1.27 cm)
Soft Start Feature None None Software algorithms prevent
sudden start/stops
Software algorithms prevent
sudden start/stops
Mutable Alarms None None
Audible portion of the alarm can
be silenced for a period of 1hr.
without deactivating the actual
alarm condition by depressing
any key
Audible portion of the alarm can
be silenced for a period of 1hr.
without deactivating the actual
alarm condition by depressing
any key

2-2 MaxQ 2000 Shaker Thermo Scientific
Section 2
General Specifications
Model No. SHKE2000CO2 (4316) SHKE2000CO2-1CE (4317)
Exterior Unit Dimensions in. (cm)
Width 13.5” (34.4 cm) 13.5” (34.4 cm)
Height 6.4” (16.3 cm) 6.4” (16.3 cm)
Length 17.4” (44.2 cm) 17.4” (44.2 cm)
Weight lbs (kg) 40 lbs (18.1 kg) 40 lbs (18.1 kg)
Electrical
Volts (AC) 120 220-240
Amps 0.75 0.4
Watts 45 45
Freq. 50/60 50/60
Speed 15 to 500 rpm, ±1 rpm 15 to 500 rpm, ±1 rpm
Timer Continuous or timed 0.1-999
hours or 0.1-999 min.
Continuous or timed 0.1-999
hours or 0.1-999 min.
Recorder Output None None
RS232 Interface* Monitor speed and time with a
computer
Monitor speed and time with a
computer
Display
2 individual LED displays indi-
cate time and speed simultane-
ously. 3 characters height 1/2
inches (1.27 cm)
2 individual LED displays indi-
cate time and speed simultane-
ously. 3 characters height 1/2
inches (1.27 cm)
Soft Start Feature Software algorithms prevent
sudden start/stops
Software algorithms prevent
sudden start/stops
Mutable Alarms
Audible portion of the alarm can
be silenced for a period of 1hr.
without deactivating the actual
alarm condition by depressing
any key
Audible portion of the alarm can
be silenced for a period of 1hr.
without deactivating the actual
alarm condition by depressing
any key

MaxQ 2000 Shaker 2-3Thermo Scientific
Section 2
General Specifications
Model No. SHKA2000
(4310)
SHKA2000-1CE
(4311) SHKE2000 (4314) SHKE2000-1CE (4315)
SHKE2000CO2
(4316)
SHKE2000CO2-1CE
(4317)
Motor Permanent
Magnet DC
Permanent
Magnet DC
Solid State
Brushless DC
Solid State
Brushless DC
Solid State
Brushless DC
Solid State Brushless
DC
Alarms
Speed None None
Audible with flash-
ing LED indicates
when speed deviates
more than 10% of
set point
Audible with flash-
ing LED indicates
when speed deviates
more than 10% of
set point
Audible with flash-
ing LED indicates
when speed deviates
more than 10% of
set point
Audible with flashing
LED indicates when
speed deviates more
than 10% of set point
Speed Shut
Off None None
When speed devi-
ates 10% of set
point, unit will shut
down immediately
When speed devi-
ates 10% of set
point, unit will shut
down immediately
When speed devi-
ates 10% of set
point, unit will shut
down immediately
When speed deviates
10% of set point, unit
will shut down immedi-
ately
Timer None None
Beeps twice when
time has expired.
Shaking motion stops
Beeps twice when
time has expired.
Shaking motion
stops
Beeps twice when
time has expired.
Shaking motion
stops
Beeps twice when time
has expired. Shaking
motion stops
Unbalanced
Load None None
If the unit is running
in an unbalanced
condition, an alarm
will sound and the
shaker will stop until
the end user corrects
the condition. The
speed display will
flash “bAL” on speed
panel LED.
If the unit is running
in an unbalanced
condition, an alarm
will sound and the
shaker will stop until
the end user corrects
the condition. The
speed display will
flash “bAL” on speed
panel LED.
If the unit is running
in an unbalanced
condition, an alarm
will sound and the
shaker will stop until
the end user corrects
the condition. The
speed display will
flash “bAL” on speed
panel LED.
If the unit is running in
an unbalanced condi-
tion, an alarm will
sound and the shaker
will stop until the end
user corrects the condi-
tion. The speed display
will flash “bAL” on
speed panel LED.
Optional Platform Dimensions in. (cm)
Catalog Number L x W
30100 Universal 13” x 11” (33 x 27.9 cm)
30110 Universal 18” x 18” (45.7 x 45.7 cm)
30106 Universal 18” x 24” (45.7 x 60.9 cm)

Environmental
Conditions
2-4 MaxQ 2000 Shaker Thermo Scientific
Section 2
General Specifications
The Thermo Scientific MaxQ 2000 Series bench top, orbital, open-air
shakers are available in one of two control configurations:
• SHKA2000 and SHKA2000-1CE incorporate a mechanical timer for
the control of time and speed, adjustable with rotary dials. Analog
tachometer displays speed in RPM, verifying accuracy of speed setting.
• SHKE2000 and SHKE2000-1CE control time and speed by a
microprocessor controller, adjustable with membrane switches on
keypad in one rpm increments. Flashing display indicates power
interruption. Pressing any key will clear display. Non-volatile memory
maintains speed and time set points in the event of a power
interruption. Speed and time set points are automatically reactivated
after power is restored.
In addition, both versions offer:
• ¾ inch (1.9 cm) triple eccentric orbital drive
• 6 permanently lubricated ball bearings
• 35 lb (15.9 kg) platform load capacity at safe speeds less than 400 rpm
for SHKA2000/SHKA2000-1CE and less than 500 rpm for
SHKE2000/SHKE2000-1CE
Intended Use
Orbital shakers are designed to provide increased aeration in a stable
temperature environment.
Unintended Use
1) Not intended for use in Class I or II applications as defined in 21 CFR
2) Not intended for mixtures of flammable materials
Pollution Degree 2**
Installation Category II**
Altitude . . . . . . . . . . . . . . . 2000 meters MSL (Mean Sea Level)
Relative Humidity . . . . 20% to 80% maximum, non-condensing
Electrical Supply . . . . . . . . . .120 VAC or 240 VAC
Voltage Tolerance . . . . . .+10% of normal rated line
Temperature . . . . . . . . . . . . . . . . . . . . .0°C to 40°C
Product Usage . . . . . . This product is intended for use indoors only
**Refer to IEC 664-1

MaxQ 2000 Shaker 2-5Thermo Scientific
Section 2
General Specifications
A-Class Control Panel
Features
Thermo Fisher Scientific hereby declares under its sole responsibility that
this product conforms with the technical requirements of the following
standards:
EMC:
EN 61000-3-2 Limits for harmonic current emissions
EN 61000-3-3 Limits for voltage fluctuations and flicker
EN 61326-1 Electrical equipment for measurement, control, and labora-
tory use; Part I: General Requirements Safety: EN 61010-1 Safety
requirements for electrical equipment for measurement, control, and lab-
oratory use; Part I: General Requirements
EN 61010-2-051 Part II: Particular requirements for laboratory equip-
ment for mixing and stirring
per the provisions of the Electromagnetic Compatibility Directive 89/336/EEC,
as amended by 92/31/EEC and 93/68/EEC, and per the provisions of the Low
Voltage Directive 73/23/EEC, as amended by 93/68/EEC.
Copies of the Declaration of Conformity are available upon request.
Caution It’s not recommended to operate shaker in a CO2 enriched
atmosphere. Formation of carbonic acid could cause electrical failures. s
1. Power Switch: Turns power on and off to shaker
2. Speed Control: Sets platform rotation speed
3. Speed Tachometer: Analog display of platform rotation speed
4. Time(r): Allows user to choose either continuous or timed operation
Declaration of
Conformity (CE only)
1234

2-6 MaxQ 2000 Shaker Thermo Scientific
Section 2
General Specifications
1. Power Switch: Turns power on and off to shaker
2. Speed Display: 3 digit LED indicates actual or set point speed
3. Up Arrow Key: Increases platform rotation speed
4. Down Arrow Switch: Decreases platform rotation speed
5. Speed Light: Red light Illuminates when a locked rotor or over-speed
condition exists
6. RPM Light: Illuminates to indicate actual speed
7. Set RPM Light: Illuminates when speed is being set
8. Stop Switch: Stops platform rotation
9. Start Switch: Starts platform rotation
10. Time(r) Display: 3 digit LED indicates time remaining or elapsed time
11. Up Arrow Key: Increases shaking time
12. Down Arrow Key: Decreases shaking time
13. Elapsed Timer Light: Indicates accumulated time
14. Hours: Timer indicates hours
15. Minutes: Timer indicates minutes
16. Set Time: Illuminates when time is being set
17. Timer/Elapsed: Allows the user to choose elapsed time operation,
Elapsed, or timed operation, Timer
18. Hours/Minutes Membrane Switch: Allows user to choose timing
operation in either hours or minutes
E-Class Control Panel
Features
1
2
3
4
5
678
9
10
1112
13
14
15
16
1817

MaxQ 2000 Shaker 3-1Thermo Scientific
Section 3 Unpacking and Installation
The shipping carton should be inspected upon delivery. When received,
carefully examine for any shipping damage before unpacking. If damage is
discovered, the delivering carrier should specify and sign for the damage on
your copy of the delivery receipt.
Open the carton carefully making certain that all parts are accounted for
before packaging materials are discarded. After unpacking, if damage is
found, promptly report it to the carrier and request a damage inspection
properly.
Important Failure to request an inspection of damage within a few days
after receipt of shipment absolves the carrier from any liability for damage.
You must call for a damage inspection promptly. s
Use the packing list below when unpacking to verify that the complete
unit has been received. Do not discard packing materials until all is
accounted for.
The following items are included in the shipment:
Operating Manual - 057-278-00
Product Registration Card- 36093
Mounting Plate Mat- 790-316-11
Thumbscrew Knob- 562-184-10
If any items are missing, contact Thermo.
Put the shaker on a level table or bench capable of supporting the weight
of the shaker with any accessories while in operation. Place shaker near an
electrical outlet that matches the unit nameplate requirements. Allow
clearance around the unit for free air convection, accessory attachments
and user convenience.
Unpacking
Location

3-2 MaxQ 2000 Shaker Thermo Scientific
Section 3
Unpacking and Installation
Electrical
Requirements
SHKA2000, SHKE2000, and SHKE2000CO2 require a 120 VAC, 50/60
Hz power source. They are supplied with a 3-wire line cord and should be
plugged into an outlet designed for 3-prong plugs. If an extension cord is
used, it also should be the 3-wire grounded type. For an outlet designed to
accept 2-prong plugs (ungrounded), it is required that a qualified
electrician replace the outlet with a new, grounded type.
SHKA2000-1CE, SHKE2000-1CE, and SHKE2000CO2-1CE require a
240 VAC, 50/60 Hz power source. Power cords are supplied.
If a plug must be installed, use only the 3-prong grounded type, rated for
the unit load requirements and matching the power outlet. Make sure the
green ground wire is secured to the plug ground terminal.
Warning Do not operate shaker with a damaged electrical cord. s
To eliminate hazard of electrical shock, make sure floor around shaker is
dry. In the event of accidental spilling or splashing of liquids, clean up
and/or neutralize the spilled liquids before continuing.
Disconnect the shaker from the power source when not in use.
1. Select the appropriate platform for the vessels to be shaken. A wide
variety of platforms and accessories are available:
• Dedicated platforms have the maximum number of flask clamps
attached for safe operation.
• Combination platforms allow the user to shake a wide variety of
different sized vessels on the same platform.
2. Carefully position the platform horizontally over the shaker�s
mounting plate, allowing the 4 thumbscrew knobs on the sides of the
mounting plate to line up with the corresponding cutouts on the
platform’s sides.
3. Once the platform is in place over the outside edges of the mounting
plate, tighten the 4 thumbscrew knobs to secure platform to the
mounting plate.
Caution Do not operate shaker with an unbalanced load. Platforms should
be loaded for optimum stability and operation. Do not lift shaker by the
platform. s
Platform Installation

MaxQ 2000 Shaker 3-3Thermo Scientific
Section 3
Unpacking and Installation
1. Carefully place the desired vessel in the clamp by first pulling the
clamp spring far enough apart to enable the flask base to be positioned
inside the clamp. Gently slide the flask into its proper position,
securing it to the wider bottom of the clamp. The spring will hold the
neck of the flask securely in place and provide security during shaking.
• Each flask clamp contains a support spring located at the narrow
top of the clamp.
• Depending on the size of the clamp, the clamp base may contain
one or several screws necessary to secure the clamp to the platform.
All screws provided with the clamp must be properly attached to
the platform.
2. Make sure all vessels are securely clamped before turning on unit.
Wherever possible, vessels should contain a stopper to prevent hazardous
substances being thrown out during the mixing action.
Warning Do not operate the shaker at speeds that will cause the contents
of vessels to be thrown out. s
1. Position the test tube rack on the combination platform so that the
cutouts on the rack’s outside bottom are aligned with corresponding
mounting holes on the platform. There are two cutouts on each side of
the rack.
2. Secure the rack to the platform with mounting screws provided with
the rack.
Flask Clamp
Installation
Test Tube Rack
Installation

MaxQ 2000 Shaker 4-1Thermo Scientific
Section 4 Operation
SHKA2000, SHKA2000-1CE
Refer to A-Class Control Panel for reference.
Power Switch
1. Depress top portion of power switch to turn on shaker.
2. Depress bottom portion of power switch to turn off shaker.
Speed Control and Display
1. Slowly rotate the knob on the solid-state speed control clockwise to
increase speed and counterclockwise to decrease speed. The
markings on the outside of the dial are for reference purposes only.
2. The speed control tachometer provides an analog readout of the
actual platform rotation speed up to a maximum of 400 rpm.
Time(r)
1. From the 12 o’clock off position, rotate timer knob
counterclockwise to the ON position to initiate continuous
operation.
2. For timed operation, rotate timer knob clockwise from 1 minute to
60 minutes. The markings on the side of the dial are in 5-minute
increments.
Caution It is recommended that shaking action be started at a low speed in
order to check that all vessels are secure and that no spilling of contents
will occur. s
Warning Do not use shaker to mix flammable materials or where the
transfer of mechanical energy to glass could cause glass breakage. s
Note Shaker will not operate if the timer is in the Off position.