LW Scientific MX12 User manual

Designed, Engineered &
Assembled Proudly in America
P. 770.270.1394 F. 770.270.2389 865 Marathon Parkway Lawrenceville GA 30046
Instruction Manual
MX12 Micro-Combo Centrifuge
The LW Scientific MX12 Micro-Combo centrifuge spins microhematocrit (PCV) and/or microtubes in one small unit. The
MX12 Micro-Combo is designed, engineered, and assembled in Atlanta, GA. This all-metal-construction unit is small,
conserving valuable counter space in the lab, but also sturdy and heavy with suction-cupped feet for stability. The
digital controls allow speed and time to be adjusted with the touch of a finger and will show real-time speed and time
remaining. The powerful, maintenance-free, brushless motor spins at 12,000 rpm producing serum and PCV results in 3
minutes. The included reader disk allows tubes to be read while still on the rotor. The MX12 Micro-Combo centrifuge is
the smart choice for any clinic or laboratory.
Introduction

Unpacking and Set-up
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What’s included:
•MX12 Micro-Combo •3-prong AC Power Cord •Manual Lid Release Tool
•Rotor(s) •Two 5-amp 250v Fuses (Pre-installed)
LW Scientific packs each MX12 Micro-Combo centrifuge with utmost care. All units undergo a QC check prior to
shipping from LW Scientific headquarters in Lawrenceville, GA to ensure proper operation. Examine the outer and inner
containers for any visible damage, and retain the packing material. If there is visible damage, please contact the
shipper or your distributor, as our warranty does not cover shipping damage.
Please register your product online at: www.LWScientific.com/warranty_form. Important: Warranty information must be
completed within 30 days of purchase.
Read the instruction manual in full before operating. Store the operation instructions in a safe place, easily accessible
by the trained staff that will be operating the centrifuge.
Place the centrifuge on a sturdy, level surface. Plug the power cord into the appropriate power outlet.
To open centrifuge lid, press and hold the lid and, press the STOP button. Verify that there are no loose objects or pack-
ing material in the tube chamber. DO NOT LOAD TUBES AT THIS TIME.
The MX12 Micro-Combo has various rotor configurations.
WARNING: Ensure the rotor is securely fixed to the rotor shaft. Failure to properly secure rotor could lead to personal
injury or damage to the centrifuge.
P. 770.270.1394 F. 770.270.2389 865 Marathon Parkway Lawrenceville GA 30046
This symbol refers to hazards that may be encountered when using this product.
CAUTION means that damage to product or environment could occur.
WARNING means that injury or contamination could occur.
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P. 770.270.1394 F. 770.270.2389 865 Marathon Parkway Lawrenceville GA 30046
Selecting and Changing Rotors
Place the centrifuge on a sturdy, level surface. Verify that there are no loose objects or packing material in the tube
chamber.
Select a rotor and slide it down over the motor shaft.
WARNING: Please use the provided thumbscrew / hex screw that comes with the rotor you are installing, DO NOT use
screws for other rotors.
Microhematocrit Rotor:
Place the cover plate onto the rotor.
Next, tighten the thumbscrew down onto the rotor. Do not over-tighten.
12-Place Microtube Rotor:
Properly tighten the provided rotor thumbscrew into the motor shaft.
24-Place Microtube Rotor:
Properly tighten the provided rotor hex screw into the motor shaft.
Use the provided allen/hex wrench to tighten the hex screw. Do not over-tighten.
Securely screw the rotor cover lid onto the rotor. Note: The rotor will make a whistling sound if the rotor cover
lid is not installed.
B
A
A
B
A
C
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AA
A B C
C
A B

MKT-7.5.3-L-246 | Rev 1
12000 13500g
P. 770.270.1394 F. 770.270.2389 865 Marathon Parkway Lawrenceville GA 30046
Testing the Unit
Set the time for 3 minutes and set the speed for 2,000 rpm. Press the START button. The unit should come up to speed
with no vibration and a smooth and quiet sound.
Next, set the speed for 12,000 rpm and run again. If there are unusual vibrations or sounds, stop the unit and contact LW
Scientific, Inc. or your distributor immediately.
WARNING: Ensure the rotor lid and/or rotor is securely fastened to the motor shaft.
Failure to properly secure rotor lid and/or rotor could lead to personal injury or damage to the centrifuge.
WARNING: DO NOT OPEN LID WHILE ROTOR IS SPINNING.
WARNING: Not intended to be used under water or near fire hazard.
To set the speed: Press the SET button once and the Speed will start flashing. Now use the UP and DOWN buttons to
set your desired speed.
To set the time: Press the SET button again and the Time will start flashing. Use the UP and DOWN buttons to change
and set the time setting to your desired time. Press ENTER to save setting.
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Reading Microhematocrit Tubes
After the rotor has stopped, turn the reader disk until the top of the fluid is aligned with the100% line.
Read the separation line in the middle for the PCV results.
P. 770.270.1394 F. 770.270.2389 865 Marathon Parkway Lawrenceville GA 30046
Prior to each use, ensure rotor and/or rotor lid is secured onto the motor shaft by tightening the rotor thumbscrew or hex
screw.
Spin only balanced loads. Ensure that tubes of equal size are always across from each other. Proper balancing will
improve sample separation, reduce vibration, and extend the life of the centrifuge.
For the 24-place microhematocrit rotor, use only 75 mm capillary tubes, ensuring that the sealant plug is aligned
outward, towards the white, silicine rotor gasket. Use only quality 75 mm capillary tubes and fresh tube sealant.
Lower-quality tubes may fracture and/or old sealant may cause blood to leak out of tubes.
Set the speed to 12,000 rpm and the time to 3 minutes.
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Press the START button to run the cycle. The unit will stop on its own and beep upon completion.
WARNING: Failure to secure rotor or rotor lid could lead to personal injury or damage to the centrifuge.
WARNING: Use ONLY 24-place microhematocrit rotor or other rotors approved by LW Scientific for use in this centrifuge.
Use of non-LW Scientific approved and tested rotors could lead to personal injury or damage to the centrifuge.
WARNING: DO NOT OPEN LID WHILE ROTOR IS SPINNING.
The SHORT SPIN button is for a manual run cycle. This allows you to spin the rotor for the time you are holding the
SHORT SPIN button. Once you release the SHORT SPIN button the centrifuge will cycle down and come to a stop.
Press the STOP button during any cycle to stop a spin cycle.
The RCF/RPM button allows you to change the digital display from RPM to RCF (G-Force). Note: A period will
appear to the right of the Speed / RCF display when the RCF is setting is selected. See Figure 1.
ROTOR TIMESPEED/RCF ROTOR TIMESPEED/RCF
Figure 1
Loading and Operation

What’s included:
•MX12 Micro-Combo •3-prong AC Power Cord •Manual Lid Release Tool
•Rotor(s) •Two 5-amp 250v Fuses (Pre-installed)
LW Scientific packs each MX12 Micro-Combo centrifuge with utmost care. All units undergo a QC check prior to
shipping from LW Scientific headquarters in Lawrenceville, GA to ensure proper operation. Examine the outer and inner
containers for any visible damage, and retain the packing material. If there is visible damage, please contact the
shipper or your distributor, as our warranty does not cover shipping damage.
Please register your product online at: www.LWScientific.com/warranty_form. Important: Warranty information must be
completed within 30 days of purchase.
Read the instruction manual in full before operating. Store the operation instructions in a safe place, easily accessible
by the trained staff that will be operating the centrifuge.
Place the centrifuge on a sturdy, level surface. Plug the power cord into the appropriate power outlet.
To open centrifuge lid, press and hold the lid and, press the STOP button. Verify that there are no loose objects or pack-
ing material in the tube chamber. DO NOT LOAD TUBES AT THIS TIME.
The MX12 Micro-Combo has various rotor configurations.
WARNING: Ensure the rotor is securely fixed to the rotor shaft. Failure to properly secure rotor could lead to personal
injury or damage to the centrifuge.
P. 770.270.1394 F. 770.270.2389 865 Marathon Parkway Lawrenceville GA 30046
Rotor Configurations
24-place Microhematocrit Rotor
• 100 to 12,000rpm
• 13,533g (max)
• Spins 24, 75mm capillary tubes
12-place Microtube Rotor
• 100 to 12,000rpm
• 9,177g (max)
• Spins 12, 1-2ml microtubes
24-place Microtube Rotor
• 100 to 12,000rpm
• 13,533g (max)
• Spins 24, 1-2ml microtubes

Care and Maintenance
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3
Use only quality 75 mm capillary tubes and fresh tube sealant. Lower-quality tubes may fracture and/or old sealant may
cause blood to leak out of tubes.
Never force a tube into the rotor holes or slots. These rotors were designed to hold the most common sized tubes.
Clean with common laboratory disinfectants regularly. Concentrated bleach may cause gaskets to crack, so avoid
using harsh cleaners. The clear silicone microhematocrit gasket is replaceable. Do not allow moisture to seep into the
centrifuge and do not contact the electrical components with any liquid during the cleaning process.
Because of safety issues with high g-forces in a centrifuge, it is recommended that rotors be inspected monthly for wear
and fatigue. If there is any indication of wear, the rotor should be removed from service. Contact LW Scientific for return
instructions so the rotor can be evaluated by a technician for repair or replacement. After 2 years of service, it is
recommended that rotors be returned to LW Scientific for inspection or replacement. Following these procedures will
ensure safety of lab personnel as well as extend the life of the centrifuge.
CAUTION: If corrosion, scratches, or other abnormalities are found on rotor or rotor lid, discontinue use and contact our
service center.
The MX12 Micro-Combo is designed to be maintenance-free. With proper care, this centrifuge will provide years of
service. However, if repairs should be needed, please contact LW Scientific, Inc.
Possible Cause
Failure Code
E1
E3
E5
E7
E8
E11
Failure Mode
Imbalance
Lid Protection
Over Power
No Speed
Main Contact Failure
Lack of Speed
Imbalance detected
Lid open
Input voltage is more than 240V
Motor is damaged
MCB or UIB is not working
Hall sensors of motor not working
Solution
Balance the rotor load
Close and latch lid
Check voltage at wall outlet
Contact LW Scientific
Confirm all wires are connected
at circuit boards
Contact LW Scientific
P. 770.270.1394 F. 770.270.2389 865 Marathon Parkway Lawrenceville GA 30046

Speed Range: 100-12000 rpm
Max RCF: 135330 g-force
Input Voltage: 110V AC/5A or 220V AC/5A
Timer: 1 sec - 99 min
Display: LED
Specifications
G-Force Chart
Dimensions:
Height: 6.3” (160 mm)
Depth: 13” (330 mm)
Width: 9.6” (243 mm)
Weight: 13.1 lbs (6.53 kg)
MKT-7.5.3-L-246 | Rev 3
P. 770.270.1394 F. 770.270.2389 865 Marathon Parkway Lawrenceville GA 30046
24-place Microhematocrit Rotor
Rotor Radius: 84mm
Speed
(rpm)
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
11000
500
12000
G-Force
(RCF)
94g
376g
845g
1503g
2348g
3381g
4602g
6010g
7607g
9391g
11363g
23g
13533g
12-place Microtube Rotor
Rotor Radius: 57mm
Speed
(rpm)
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
11000
500
12000
G-Force
(RCF)
60g
380g
573g
1019g
1593g
2294g
3172g
4078g
5161g
6372g
7710g
16g
9177g
24-place Microtube Rotor
Rotor Radius: 84mm
Speed
(rpm)
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
11000
500
12000
G-Force
(RCF)
94g
376g
845g
1503g
2348g
3381g
4602g
6010g
7607g
9391g
11363g
23g
13533g