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Why Buy a Quadra All instruments, made by various manufactures, have certain key design features that set them apart from others. The question is what is important for your application. Here are the Quadra’s key design elements. Operational Reliability Tomtec has Quadras that are 20 years old and stilling running daily. Why? Because of the basic design concept. The complex pipettor head is fixed in position. The electronic connections, sensors, plumbing, mechanics, etc. do not move. A simple mechanical stage lifts the plates and reservoirs from the shuttle to the tips. Since the stage is only moving light weight microplates, it can easily index both X and Y to provide serial dilutions, or reformat from 96 to 384 to 1536. Unique Pipettor Head Design – Air Displacement The pipettor pistons start at the top of the pipettor tip. This means the minimum dead air is the tip volume, which by definition is the minimum for air displacement pipetting. Each piston has a small air passageway to blow low pressure compressed air (0-15psi) through the tip under program control. This effectively clears the tip residual retained by capillary action after a dispense. Far more effective than blow out air. Provides true non-contact dispensing. Can go from aqueous to organic back to aqueous pipetting, without changing tips. Unique Pipettor Head Design – Positive Displacement A very hard titanium nitrate coated piston with a Teflon coated, inside and outside, in a positive displacement design. Pipetting accuracy of 1% are achievable at low 1µL volumes. Ultrasonic tip washing is used between samples. Simplicity in Programming The same steps used for manual pipetting are combined intuitively in an automated program sequence. A plate database provides dimensional data for pipetting, i.e. bottom of the well, top of the well, etc. Uncrate the Quadra in the morning, run your programs in the afternoon.
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