Laboratory Centrifuges

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Laboratory Centrifuges

We sell a wide range of Hermle, MSE and Labnet bench top centrifuges.

Things you should consider when purchasing a laboratory centrifuge are:

Laboratory Centrifuges.1. The maximum speed (rpm. or rcf)

2. The dimensions of your tubes, etc. and the maximum number per centrifuge run (or total volume of sample(s) per run)

3. Unrefrigerated or refrigerated centrifuges (including time to reach set chamber temperature and ability of centrifuge to hold that temperature during runs)

4. Standard or programmable (e.g. different acceleration / deceleration rates and memory for most used runs / parameters)

5. Do you require hermetically sealable lids on rotor / buckets?

6. Safety features of the laboratory centrifuges

7. Other features such as induction motor and noise level

 

 

Call... Enquire...
Call Progen Scientific to discuss your requirements on 020 85422283 Click here to make an enquiry online

 

 

Glossary:

Rotor speed is measured in r.p.m. (revolutions per minute) and / or relative centrifugal force (rcf) / g force (expressed as number x g.). Centrifugal force is the best comparison of the efficiency of centrifuge rotors and is a measure of the relationship between the rotor radius and measurement to end of tube bucket. Fixed angle rotors can reach the highest speeds and g force whereas swing-out rotors (with buckets and adaptors for different tubes, etc.) are limited in speed because of the weight but can hold larger volumes / numbers of tubes, etc.Laboratory Centrifuge.

Rotors and accessories: Fixed angle rotors are solid rotors with a number of holes depending on the tube / bottle size and various angles of the holes giving different g forces. Adaptors can be used with some of these rotors to accommodate smaller tubes. Swing-out rotors can hold 4 or six buckets / carriers. The buckets can then accommodate a variety of drop-in adaptors (round or rectangular) for different sizes and quantities of tubes / bottles. Some centrifuges (Hermle for instance) have 'high capacity rotors) which use solid, round buckets with drilled holes for different size tubes.

Swing-out rotors (or adaptors for other rotors) are also available to hold microtitre plates

NOTE:Although laboratory centrifuges can be capable of a certain maximum speed, not all the rotors available for that centrifuge will be capable of that maximum speed (refer to the centrifuge literature).

Laboratory Centrifuges.Hermetically sealable lids: Rotors can be used without lids.
If sample containment is a problem then screw cap sample tubes can be used. Some fixed angle rotors (such as microcentrifuge rotors) can be supplied with a click-on lid but if the samples are biohazardous then screw-on lids are available for some fixed angle rotors or the buckets of swing-out rotors. These lids are specifically designed to contain any accidental sample spillage during centrifugation and are called hermetically sealable

Refrigerated laboratory centrifuges use an internal cooling system (compressor, condenser, etc.) to maintain the centrifuge chamber and hence the samples being centrifuges at a pre-set below ambient temperature. Centrifugation in an unrefrigerated centrifuge usually causes samples to heat up to some extent and temperature sensitive samples could be affected, hence the use of a refrigerated centrifuge

Brushless motors are used in the majority of modern centrifuges and are 'maintenance-free' magnetic induction motors. Older centrifuges used to use brush motors and the brushes wore out requiring replacement. Brushless motors are usually quieter than brush motors

Programmable laboratory centrifuges can offer a choice of acceleration and deceleration rates for the rotors and also storage memory for the most used runs / paramaters

Laboratory Centrifuge.Lid locks are built into most centrifuges now and are either the type that clicks shut when the centrifuge starts and can not be opened until the rotor stops or are motor driven and so close automatically when the centrifuge starts

Imbalance detector is a device built into some centrifuges to detect if the load in the rotor is not balanced correctly. Imbalance can seriously damage a centrifuge as the spindle the rotor sits on starts moving away from the vertical. Imbalance detectors detect any variation from the vertical (usually 1 mm. or so) and shuts down the centrifuge, hopefully before any damage can be done

Rotor identification is used in some centrifuges to identify the rotor being used as the centrifuge starts a run and will not allow the rotor to go past its rated maximum speed (even if the speed set on the centrifuge controls is faster than the maximum rated speed).

This protects the rotor, centrifuge and operator

 

Types of laboratory centrifuges:

 

Microcentrifuges are usually used to spin microtubes (e.g. 1.5 / 2.0ml. 'Eppendorf', 0.5ml., 0.4ml. and 0.2ml. tubes), have fixed angle rotors and have variable speed up to around 15,000 rpm. (20,000 x g. depending on rotor). Rotors can accommodate up to 30 x 1.5 / 2.0ml. tubes with the most common being the 24 x 1.5 / 2.0ml. tubes rotor

Refrigerated microcentrifuges have a cooling system with adjustable temperature in the range -10oC to +40oC and are usually run at 4oC

Mini microcentrifuges usually have a fixed speed (around 6000 rpm / 2000 x g.) and integral rotor for 1/5 / 2.0ml. tubes with adaptors for 0.5ml., 0.4ml. and 0.2ml. tubes or adaptor to hold 2 x strips of 8 x 0.2ml. tubes. Another model can hold 2 x microarray slides for removing excess liquid

Benchtop centrifuges as the name implies are designed for use on a benchtop as opposed to ultra laboratory centrifuges which have to be floor standing. Some benchtop centrifuges are capable of fairly high speeds and rcf. as well as large total sample volumes

Haematocrit centrifuges are specifically designed for blood sedimentation tests in haematology labs., etc. and have a rotor specially designed to hold very narrow bore microhaematocrit tubes. The rotor can have a built-in reading for the sedimentation or a separate card can be used to measure the results

Cytospin centrifuges are specifically used in cytology labs. and have special rotors and sample holders

Ultracentrifuges are designed as very high speed (rpm. and rcf) centrifuges which have to be floor mounted. They are very expensive and have very expensive rotors. Only a few companies manufacture these centrifuges.

Centrifugal evaporators: Designed to evaporate multiple samples down using a combination of centrifuge / rotor, vacuum pump and solvent trap (refrigerated cold trap or recirculating suction water trap). The centrifuge chamber can have the option of heating (to speed sample evaporation) and / or teflon coating (if using samples with aggressive solvents).

Click here to view our range of Laboratory Centrifuges

 

Call... Enquire...
Call Progen Scientific to discuss your requirements on 020 85422283 Click here to make an enquiry online

 

 

Please visit our procduct range for laboratory centrifuges. You can also telephone or enquire with one of our sales representatives for more information.


 
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