Using Timed Mode to Make Repeatable Deposits
1.
Refer to the previous section to purge your dispense tip of air and fill it with fluid.
2.
Place the unit into “Timed” mode.
3.
Set the dispense time. The dispense time or duration may be set in one of two ways:
• Using the Up / down Arrows to set time. Refer to the “Features and Controls” section.
• Using the Program / Teach button to set time. Refer to the “Features and Controls” section.
4.
Press the foot pedal / finger switch to activate the dispense cycle. The dispenser will now continuously
dispense for the pre-set duration of time. Once the time has expired, the dispenser will stop dispensing and
await another triggering signal from the foot pedal / finger switch or signal from the host controller.
NOTE:
The foot pedal / finger switch only needs to be pressed for a moment.
If the foot pedal / finger switch or contact closure I/O signal is initiated at any time during the dispense cycle,
the dispenser will immediately abort and stop dispensing. This is a unique safety feature to prevent accidental
dispensing.
Using the Vacuum Control Feature for Low Viscosity Fluids
The Vacuum Control feature allows you to dispense low viscosity fluids consistently without dripping between
cycles. The vacuum overcomes head pressure on the fluid within the barrel, which prevents dripping.
1.
Make sure that you have attached an EFD syringe barrel filled with the
fluid intended for dispensing, and that the air pressure is set all the way to
zero. EFD recommends the use of a Blue LV Barrier piston for watery, low
viscosity materials.
2.
Make sure the barrel adapter safety clip is closed.
3.
Remove the tip cap and replace it with an appropriate EFD dispense tip.
4.
Set the air pressure at 0.1 bar (2 psi).
5.
While pointing the tip over a container or resting it on a test surface, release
the safety clip on the adapter / Optimeter hose assembly.
6.
Place the dispenser in “Steady” mode. Depress and hold the foot pedal
until a drip begins to form at the end of the tip.
7.
Release the foot pedal. At this point, fluid will continue to exit the tip.
8.
Increase the vacuum using the keypad by 0.5 to 1.0 inches of water until
the fluid deposit size stabilizes without growing.
NOTE:
Do not increase the vacuum to the point where the deposit is
actually drawn back into the tip or to where bubbles form in the barrel.
Excessive vacuum causes inconsistent dispensing.
9.
Lift the tip off the test surface, wipe the tip end and retest by pressing the foot pedal momentarily. The deposit
should stay at the intended size and not increase or decrease in size. If it does, repeat steps 4–8 to fine-tune
the vacuum control.
10.
Once the vacuum is properly set, increase air pressure to the desired production setting before beginning your
dispensing process.
LV Barrier
1/2 maximum fill
Air gap
Ultimus V High Precision Fluid Dispenser
18
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