M24 Centrifuge
Brush Replacement
Instruction Manual
1 Unplug the centrifuge, and turn it on its side.
M24 Centrifuge (HEC-24HF-7501)
2 Remove the feet and all Phillips head screws holding
the metal base plate.
3 Using a flat head screwdriver, remove the two black See back page for model specifications.
caps on the bottom part of the motor.
4 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. • 24-Place Microhematocrit Centrifuge
• Affordable
5 Place the new brushes in the recessed hole, and
replace the black caps. (See image, right) • Results in Less Than 5 Minutes
6 Replace the metal base plate and the feet.
7 Your LWS-M24 is now ready to use.
Specifications
Nominal speed: 12,000 RPM (+/- 500)*
Max. Volume: 24 - 75mm capillary tubes
Max. Power: 110 volt
Height: 8.7 inches
Width: 10.6 inches
Depth: 12.5 inches Introduction
Weight: 15.8 lbs.
Boxed dimensions: 11.5 x 10 x 7 inches
Boxed weight: 23 lbs.
The LW Scientific microhematocrit centrifuge, LWS-M24 , is designed for rapid hematocrit separations in a compact,
sturdy and inexpensive unit.
* These are average speeds, which vary slightly between units and with load size. Please use a tachometer for
actual RPMs on your unit, and for calibration purposes.
Features
15-minute timer, LED power indicator light, 24 capillary capacity (75mm), safety switch in lid (lifting of the lid turns the
centrifuge off), all metal construction. Your LWS-M24 is powered by a 110v - 5 amp motor. Maximum speed is 12,000
rpms (+/- 500).
P. 770.270.1394 F. 770.270.2389 865 Marathon Parkway Lawrenceville GA 30046 P. 770.270.1394 F. 770.270.2389 865 Marathon Parkway Lawrenceville GA 30046
Installation & Setup
Reading Hematocrits
1 Remove the centrifuge from the shipping container and inspect for any possible shipping damage. If the centrifuge
appears to be damaged, please contact your distributor immediately.
Your M24 includes a Reader Disc , which allows hematocrit tubes to be directly read from the rotor.
2 Read and fill out the warranty card and return the address portion (mail or fax it to LW Scientific ). The warranty card
documents your purchase. Failure to fill out and return the warranty card may void any warranty claims on the unit.
1 After rotor is stopped, remove the cover plate by unscrewing the chrome thumbscrew and lifting the cover plate
straight up.
3 Place the centrifuge on a sturdy, level surface. Verify that there are no loose objects or packing material in the
tube chamber. 2 Place the reader disc over the hematocrit tubes, and adjust the disc until the 0% line is lined up with the bottom of the
fluid in the tube to be read.
4 Verify that the rotor cover is securely tightened.
3 While keeping the 0% line positioned at the bottom of the fluid, turn the disc until the 100% line aligns with the top of
5 Close the lid firmly. the fluid.
6 Verify that the timer is in the “OFF” position and plug the AC adapter into an approved and properly grounded 110V
4 Read the separation line in the middle for your hematocrit result. Follow the same steps to read each tube.
AC outlet.
7 Do not insert capillary tubes at this time! Turn the centrifuge on. If there is a smooth whirring sound and the unit
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.
Troubleshooting
Operation
1 Light comes on but will not spin ...check to make sure the lid safety switch (near back right lid hinge) is engaging. Test
1 Spin only balanced loads. Make sure that capillary tubes are placed opposite each other. Proper sample balancing by pushing with your finger to see if rotor will spin. The button height can be adjusted by turning it.
will improve sample separation and will extend the life of the centrifuge. Out of balance loads may damage the
centrifuge. 2 No spin, no light ...confirm that your power source is working. Check the 8amp fuse and replace if necessary.
(A good fuse will have a metal rod through the middle of the glass; a burnt fuse will have a broken rod in the middle.)
2 Set timer for desired time, usually 3-5 minutes. Unit will begin spinning at full speed (12,000 rpm).
3 After unit has stopped, carefully remove the capillary tubes and hold vertically.
4 Place the reader card directly behind the tube, and align the top and bottom of the fluid with the 0 and 100 lines.
5 The separation line should be read on the graph at the point of the separation.
Care & Maintenance With proper care and maintenance, the M24 centrifuge will provide years of
service. Please follow these guidelines:
1 Use only 75mm capillary tubes. Never force a tube into the holder.
2 Clean the inside of the centrifuge regularly. Whenever there is a tube breakage or a 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).
3 Motor and electrical maintenance: The M24’s motor utilizes brushes which may need occasional replacement.
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.
P. 770.270.1394 F. 770.270.2389 865 Marathon Parkway Lawrenceville GA 30046
