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Part I

How to use an automatic dispenser

Choosing the right dispenser provides the right tool for the job, but it is important to follow a few general rules and principles to ensure trouble-free dispensing and to avoid the common errors that can be made when dispensing liquids and pastes.

Effects of pressure and time on dot size
Note the effect on dot size by applying different air pressure, time settings and tip sizes.
 
Increasing either the air pressure, time duration or tip size will increase the dot size.
 
Decreasing either the air pressure, time duration or tip size will decrease the dot size.
 
Thicker, more viscous liquids, such as pastes or greases, will require either more pressure, longer time or a larger size tip.
 
Thinner, less viscous liquids, such as cyanoacrylates or thinners, will require less pressure, shorter time or a smaller tip size.
 
Higher pressure and/or short time cycle increases the dispensing speed and provides a higher output.
 
Lower pressure and/or longer time cycle improves accuracy in deposit size.
 
How to make consistent deposits
The best angle to hold the barrel is between 45º and 80º degrees. The barrel should be lifted vertically to avoid spoiling the deposit.
 
When making a dot, bring the tip into contact with the work surface at the angle illustrated. Depress the foot pedal to initiate the shot and keep the barrel in position until the cycle is complete.
 
Remove the tip from the deposit by moving the barrel straight up. With the air pressure and time set, each successive deposit will be identical.

Fluid filling (loading)
Fluid loading is dependent on the type of material you are using.
 
Low viscosity fluids.
 
Simply pour low viscosity materials into the barrel, leaving an air space at the top. For best results fill the barrel to 2/3rds full and refill at 1/3rd full.
High viscosity fluids
The loading of highly viscous materials can be simplified using a barrel loader. Using a pre-filled 12 oz cartridge, insert the cartridge in a metal container and connect the air hose to a model DSP501A dispenser.
 
Luer lock barrels may then be loaded by operating the dispenser, either for a timed period or manually until the barrel is filled. The barrel should be filled, leaving a space at the top for air compression when fitting the adapter assembly. Use a barrel piston when filling barrels.

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