M24 Centrifuge
Instruction Manual
M24 Centrifuge
See back page for model specifications.
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24-Place Microhematocrit Centrifuge
Results in Less Than 5 Minutes
CLMA recommends that your hematocrit
*
centrifuge PVC accuracy be calibrated quarterly
using the HemataCHEK reference control kit.
Refer to HemataCHEK product insert for
calibration procedures.
Visit www.LWScientific.com
to order or contact your
distributor.
(HEC-24HF-7501)
Introduction
The LW microhematocrit centrifuge, LWS-M24, is designed for rapid hematocrit seperations in a compact, sturdy, and inexpensive unit.
Features
15-minute timer, 24 capillary capacity (75mm), lid safety switch (lifting of the lid turns the centrifuge off), metal construction.
Maximum speed is 12,000 rpms (+/- 500).
P. 770.270.1394 F. 770.270.2389 865 Marathon Parkway Lawrenceville GA 30046
Installation & Setup
Remove the centrifuge from the shipping container and inspect for any possible shipping damage. If the centrifuge
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appears to be damaged, please contact your distributor immediately.
Register your product at www.LWScientific.com/waranty_form.
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Place the centrifuge on a sturdy, level surface. Verify that there are no loose objects or packing material in the tube
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chamber. *To open lid, push down first and then pull lid to open.
Verify that the rotor cover is securely tightened.
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Close the lid firmly.
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Verify that the timer is in the “OFF” position and plug the unit into an approved and properly grounded AC outlet.
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Do not insert capillary tubes at this time! Turn the centrifuge on. If there is a smooth whirring sound and the unit
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accelerates with little or no vibration, your M24 centrifuge is ready to operate. If there are loud or unusual sounds,
or if you experience excessive vibration, DO NOT OPERATE -- contact your dealer or LW Scientific, Inc.
Operation
Spin only balanced loads. Make sure that capillary tubes are placed opposite each other. Proper sample balancing will
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improve sample separation and will extend the life of the centrifuge. Out of balance loads may damage the centrifuge.
Set timer for desired time. Unit will begin spinning at full speed (12,000rpm).
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Care & Maintenance
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Use only 75mm capillary tubes. Never force a tube into the holder.
Clean the inside of the centrifuge regularly. Whenever there is a tube breakage or spill, it is recommended that the inside of the
centrifuge be cleaned, and if possible, disinfected (do not immerse the electrical components in any liquid).
Motor and electrical maintenance: The M24’s motor utilizes brushes which may need occasional replacement. LW Scientific
recommends that the brushes be checked every month for wear. The electrical components were designed for high reliability and
should not need regular service. However, if repairs or replacement brushes are needed, please contact LW Scientific, Inc.
With proper care and maintenance, the M24 centrifuge will provide years of service.
Please follow these guidelines:
Because of the safety issues with high g-forces in a centrifuge, it is recommended that rotors be inspected every 6 months for
corrosion 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 an LW Scientific technician for repair or replacement. It is also recommended that
after 2 years of service rotors be returned to LW Scientific for inspection. Following these procedures will ensure safety of lab
personnel as well as extend the life of the centrifuge.
Reading Hematocrits
Your M24 includes a Reader Disc, which allows hematocrit tubes to be directly read from the rotor.
After rotor is stopped, remove the cover plate by unscrewing the chrome thumbscrew and lifting the cover plate
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straight up.
Place the reader disc over the hematocrit tubes, and adjust the disc until the 0% line is lined up with the bottom of the
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fluid in the tube to be read.
While keeping the 0% line positined at the bottom of the fluid, turn the disc until the 100% line aligns with the top of
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the fluid.
Read the separation line in the middle for your hematocrit result. Follow the same steps to read each tube.
Read the separation line in the middle for your hematocrit result. Follow the same steps to read each tube.
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Troubleshooting
Light comes on but will not spin: Check to make sure the lid safety switch (near back right lid hinge) is engaged.
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With the power on and the timer set, depress the button with your finger. If the rotor spins, turn the safety switch
button counter-clockwise to raise the height and allow it to contact the lid when closed.
No spin, no light: Confirm that your power source is working. Check the 8 amp fuse and replace if necessary.
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(A good fuse will have an intact metal filament through the center; a burnt fuse will have a broken filament.
P. 770.270.1394 F. 770.270.2389 865 Marathon Parkway Lawrenceville GA 30046
Brush Replacement
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Unplug the centrifuge, and turn it on its side.
Remove the feet and all Phillips head screws holding
the metal base plate.
Using a flat head screwdriver, remove the two black
caps on the bottom part of the motor.
Using your fingers, pull the brush out of the recessed
hole that the black caps were removed from. The
brushes consist of springs with a graphite bar on them.
Place the new brushes in the recessed hole, and
replace the black caps (See image, right).
Replace the metal base plate and the feet.
Your LWS-M24 is now ready to use.
Specifications
Nominal speed:
Max. Volume:
Input Voltage:
Height:
Width:
Depth:
Weight:
Boxed dimensions:
Boxed weight:
*These are average speeds, which may vary slightly between units and with load size. Please use a tachometer for actual
RPMs on your unit, and for calibration purposes.
12,000 RPM (+/- 500)*
24 - 75mm capillary tubes
110V or 220V
8.7 inches
10.6 inches
12.5 inches
15.8 lbs
11.5 x 10 x 7 inches
23 lbs.
MKT-7.5.3-L-032 | Rev 1
P. 770.270.1394 F. 770.270.2389 865 Marathon Parkway Lawrenceville GA 30046
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