P. 770.270.1394 F. 770.270.2389 865 Marathon Parkway Lawrenceville GA 30046

See back page for model speci�cations.

M24 Centrifuge (HEC-24HF-7501)

M24 Centrifuge

The LW Scienti�c 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.

15-minute timer, LED power indicator light, 24 capillary capacity (75mm), safety switch in lid (lifting of the lid turns the centrifuge o�), all metal construction. Your LWS-M24 is powered by a 110v - 5 amp motor. Maximum speed is 12,000 rpms (+/- 500).

Introduction

Features

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Speci�cations

Unplug the centrifuge, and turn it on its side.

Remove the feet and all Phillips head screws holding the metal base plate.

Using a �at head screwdriver, remove the two black caps on the bottom part of the motor.

Using your �ngers, 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.

Brush Replacement Instruction Manual

P. 770.270.1394 F. 770.270.2389 865 Marathon Parkway Lawrenceville GA 30046

Nominal speed:Max. Volume: Max. Power:Height:Width:Depth:Weight:Boxed dimensions:

12,000 RPM (+/- 500)*24 - 75mm capillary tubes110 volt8.7 inches10.6 inches12.5 inches15.8 lbs.11.5 x 10 x 7 inches

Boxed weight: 23 lbs.

• 24-Place Microhematocrit Centrifuge

• A�ordable

• Results in Less Than 5 Minutes

P. 770.270.1394 F. 770.270.2389 865 Marathon Parkway Lawrenceville GA 30046

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.

Read and �ll out the warranty card and return the address portion (mail or fax it to LW Scienti�c ). The warranty card documents your purchase. Failure to �ll out and return the warranty card may void any warranty claims on the unit.

Place the centrifuge on a sturdy, level surface. Verify that there are no loose objects or packing material in the tube chamber.

Verify that the rotor cover is securely tightened.

Close the lid �rmly.

Verify that the timer is in the “OFF” position and plug the AC adapter into an approved and properly grounded 110V AC outlet.

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 Scienti�c, Inc.

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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 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 �uid in the tube to be read.

While keeping the 0% line positioned at the bottom of the �uid, turn the disc until the 100% line aligns with the top of the �uid.

Read the separation line in the middle for your hematocrit result. Follow the same steps to read each tube.

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Spin only balanced loads. Make sure that capillary tubes are placed opposite each other. Proper sample balancing will improve sample separation and will extend the life of the centrifuge. Out of balance loads may damage the centrifuge.

Set timer for desired time, usually 3-5 minutes. Unit will begin spinning at full speed (12,000 rpm).

After unit has stopped, carefully remove the capillary tubes and hold vertically.

Place the reader card directly behind the tube, and align the top and bottom of the �uid with the 0 and 100 lines.

The separation line should be read on the graph at the point of the separation.

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Operation

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 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).

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 Scienti�c, Inc.

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Care & Maintenance

Reading Hematocrits

Light comes on but will not spin ...check to make sure the lid safety switch (near back right lid hinge) is engaging. Test by pushing with your �nger to see if rotor will spin. The button height can be adjusted by turning it.

No spin, no light ...con�rm 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.)

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Troubleshooting

With proper care and maintenance, the M24 centrifuge will provide years of service. Please follow these guidelines:

Installation & Setup